2 * FreeRTOS Kernel V10.0.1
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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28 /* Standard includes. */
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32 /* FreeRTOS includes. */
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33 #include "FreeRTOS.h"
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35 #include "stream_buffer.h"
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37 /* Demo app includes. */
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38 #include "StreamBufferDemo.h"
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40 /* The number of bytes of storage in the stream buffers used in this test. */
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41 #define sbSTREAM_BUFFER_LENGTH_BYTES ( ( size_t ) 30 )
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43 /* Start and end ASCII characters used in data sent to the buffers. */
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44 #define sbASCII_SPACE 32
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45 #define sbASCII_TILDA 126
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47 /* Defines the number of tasks to create in this test and demo. */
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48 #define sbNUMBER_OF_ECHO_CLIENTS ( 2 )
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49 #define sbNUMBER_OF_SENDER_TASKS ( 2 )
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51 /* Priority of the test tasks. The send and receive go from low to high
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52 priority tasks, and from high to low priority tasks. */
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53 #define sbLOWER_PRIORITY ( tskIDLE_PRIORITY )
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54 #define sbHIGHER_PRIORITY ( tskIDLE_PRIORITY + 1 )
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56 /* Block times used when sending and receiving from the stream buffers. */
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57 #define sbRX_TX_BLOCK_TIME pdMS_TO_TICKS( 125UL )
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59 /* A block time of 0 means "don't block". */
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60 #define sbDONT_BLOCK ( 0 )
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62 /* The trigger level sets the number of bytes that must be present in the
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63 stream buffer before a task that is blocked on the stream buffer is moved out of
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64 the Blocked state so it can read the bytes. */
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65 #define sbTRIGGER_LEVEL_1 ( 1 )
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67 /* The size of the stack allocated to the tasks that run as part of this demo/
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68 test. The stack size is over generous in most cases. */
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69 #define sbSTACK_SIZE ( configMINIMAL_STACK_SIZE + ( configMINIMAL_STACK_SIZE >> 1 ) )
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71 /*-----------------------------------------------------------*/
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74 * Performs various tests that do not require multiple tasks to interact.
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76 static void prvSingleTaskTests( StreamBufferHandle_t xStreamBuffer );
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79 * Tests sending and receiving various lengths of data via a stream buffer.
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80 * The echo client sends the data to the echo server, which then sends the
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81 * data back to the echo client, which checks it receives exactly what it
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84 static void prvEchoClient( void *pvParameters );
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85 static void prvEchoServer( void *pvParameters );
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88 * Tasks that send and receive to a stream buffer at a low priority and without
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89 * blocking, so the send and receive functions interleave in time as the tasks
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90 * are switched in and out.
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92 static void prvNonBlockingReceiverTask( void *pvParameters );
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93 static void prvNonBlockingSenderTask( void *pvParameters );
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96 * A task that creates a stream buffer with a specific trigger level, then
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97 * receives a string from an interrupt (the RTOS tick hook) byte by byte to
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98 * check it is only unblocked when the specified trigger level is reached.
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100 static void prvInterruptTriggerLevelTest( void *pvParameters );
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102 #if( configSUPPORT_STATIC_ALLOCATION == 1 )
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103 /* This file tests both statically and dynamically allocated stream buffers.
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104 Allocate the structures and buffers to be used by the statically allocated
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105 objects, which get used in the echo tests. */
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106 static void prvReceiverTask( void *pvParameters );
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107 static void prvSenderTask( void *pvParameters );
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109 static StaticStreamBuffer_t xStaticStreamBuffers[ sbNUMBER_OF_ECHO_CLIENTS ];
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110 static uint8_t ucBufferStorage[ sbNUMBER_OF_SENDER_TASKS ][ sbSTREAM_BUFFER_LENGTH_BYTES + 1 ];
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111 static uint32_t ulSenderLoopCounters[ sbNUMBER_OF_SENDER_TASKS ] = { 0 };
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112 #endif /* configSUPPORT_STATIC_ALLOCATION */
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114 /*-----------------------------------------------------------*/
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116 /* The buffers used by the echo client and server tasks. */
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117 typedef struct ECHO_STREAM_BUFFERS
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119 /* Handles to the data structures that describe the stream buffers. */
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120 StreamBufferHandle_t xEchoClientBuffer;
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121 StreamBufferHandle_t xEchoServerBuffer;
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122 } EchoStreamBuffers_t;
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123 static volatile uint32_t ulEchoLoopCounters[ sbNUMBER_OF_ECHO_CLIENTS ] = { 0 };
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125 /* The non-blocking tasks monitor their operation, and if no errors have been
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126 found, increment ulNonBlockingRxCounter. xAreStreamBufferTasksStillRunning()
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127 then checks ulNonBlockingRxCounter and only returns pdPASS if
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128 ulNonBlockingRxCounter is still incrementing. */
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129 static volatile uint32_t ulNonBlockingRxCounter = 0;
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131 /* The task that receives characters from the tick interrupt in order to test
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132 different trigger levels monitors its own behaviour. If it has not detected any
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133 error then it increments ulInterruptTriggerCounter to indicate to the check task
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134 that it is still operating correctly. */
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135 static volatile uint32_t ulInterruptTriggerCounter = 0UL;
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137 /* The stream buffer used from the tick interrupt. This sends one byte at a time
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138 to a test task to test the trigger level operation. The variable is set to NULL
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139 in between test runs. */
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140 static volatile StreamBufferHandle_t xInterruptStreamBuffer = NULL;
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142 /* The data sent from the tick interrupt to the task that tests the trigger
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143 level functionality. */
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144 static const char *pcDataSentFromInterrupt = "12345678";
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146 /* Data that is longer than the buffer that is sent to the buffers as a stream
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147 of bytes. Parts of which are written to the stream buffer to test writing
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148 different lengths at different offsets, to many bytes, part streams, streams
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149 that wrap, etc.. Two messages are defined to ensure left over data is not
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150 accidentally read out of the buffer. */
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151 static const char *pc55ByteString = "One two three four five six seven eight nine ten eleven";
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152 static const char *pc54ByteString = "01234567891abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQ";
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154 /*-----------------------------------------------------------*/
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156 void vStartStreamBufferTasks( void )
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158 StreamBufferHandle_t xStreamBuffer;
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160 /* The echo servers sets up the stream buffers before creating the echo
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161 client tasks. One set of tasks has the server as the higher priority, and
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162 the other has the client as the higher priority. */
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163 xTaskCreate( prvEchoServer, "1StrEchoServer", sbSTACK_SIZE, NULL, sbHIGHER_PRIORITY, NULL );
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164 xTaskCreate( prvEchoServer, "2StrEchoServer", sbSTACK_SIZE, NULL, sbLOWER_PRIORITY, NULL );
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166 /* The non blocking tasks run continuously and will interleave with each
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167 other, so must be created at the lowest priority. The stream buffer they
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168 use is created and passed in using the task's parameter. */
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169 xStreamBuffer = xStreamBufferCreate( sbSTREAM_BUFFER_LENGTH_BYTES, sbTRIGGER_LEVEL_1 );
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170 xTaskCreate( prvNonBlockingReceiverTask, "StrNonBlkRx", configMINIMAL_STACK_SIZE, ( void * ) xStreamBuffer, tskIDLE_PRIORITY, NULL );
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171 xTaskCreate( prvNonBlockingSenderTask, "StrNonBlkTx", configMINIMAL_STACK_SIZE, ( void * ) xStreamBuffer, tskIDLE_PRIORITY, NULL );
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173 /* The task that receives bytes from an interrupt to test that it unblocks
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174 at a specific trigger level must run at a high priority to minimise the risk
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175 of it receiving more characters before it can execute again after being
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177 xTaskCreate( prvInterruptTriggerLevelTest, "StrTrig", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
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179 #if( configSUPPORT_STATIC_ALLOCATION == 1 )
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181 /* The sender tasks set up the stream buffers before creating the
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182 receiver tasks. Priorities must be 0 and 1 as the priority is used to
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183 index into the xStaticStreamBuffers and ucBufferStorage arrays. */
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184 xTaskCreate( prvSenderTask, "Str1Sender", sbSTACK_SIZE, NULL, sbHIGHER_PRIORITY, NULL );
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185 xTaskCreate( prvSenderTask, "Str2Sender", sbSTACK_SIZE, NULL, sbLOWER_PRIORITY, NULL );
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187 #endif /* configSUPPORT_STATIC_ALLOCATION */
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189 /*-----------------------------------------------------------*/
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191 static void prvSingleTaskTests( StreamBufferHandle_t xStreamBuffer )
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193 size_t xReturned, xItem, xExpectedSpace;
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194 const size_t xMax6ByteMessages = sbSTREAM_BUFFER_LENGTH_BYTES / 6;
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195 const size_t x6ByteLength = 6, x17ByteLength = 17, xFullBufferSize = sbSTREAM_BUFFER_LENGTH_BYTES * ( size_t ) 2;
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196 uint8_t *pucFullBuffer, *pucData, *pucReadData;
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197 TickType_t xTimeBeforeCall, xTimeAfterCall;
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198 const TickType_t xBlockTime = pdMS_TO_TICKS( 15 ), xAllowableMargin = pdMS_TO_TICKS( 3 ), xMinimalBlockTime = 2;
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199 UBaseType_t uxOriginalPriority;
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201 /* Remove warning in case configASSERT() is not defined. */
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202 ( void ) xAllowableMargin;
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204 /* To minimise stack and heap usage a full size buffer is allocated from the
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205 heap, then buffers which hold smaller amounts of data are overlayed with the
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206 larger buffer - just make sure not to use both at once! */
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207 pucFullBuffer = pvPortMalloc( xFullBufferSize );
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208 configASSERT( pucFullBuffer );
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210 pucData = pucFullBuffer;
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211 pucReadData = pucData + x17ByteLength;
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213 /* Nothing has been added or removed yet, so expect the free space to be
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214 exactly as created. */
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215 xExpectedSpace = xStreamBufferSpacesAvailable( xStreamBuffer );
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216 configASSERT( xExpectedSpace == sbSTREAM_BUFFER_LENGTH_BYTES );
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217 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdTRUE );
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220 /* The buffer is 30 bytes long. 6 5 byte messages should fit before the
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221 buffer is completely full. */
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222 for( xItem = 0; xItem < xMax6ByteMessages; xItem++ )
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224 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdFALSE );
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226 /* Generate recognisable data to write to the buffer. This is just
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227 ascii characters that shows which loop iteration the data was written
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228 in. The 'FromISR' version is used to give it some exercise as a block
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229 time is not used, so the call must be inside a critical section so it
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230 runs with ports that don't support interrupt nesting (and therefore
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231 don't have interrupt safe critical sections). */
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232 memset( ( void * ) pucData, ( ( int ) '0' ) + ( int ) xItem, x6ByteLength );
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233 taskENTER_CRITICAL();
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235 xReturned = xStreamBufferSendFromISR( xStreamBuffer, ( void * ) pucData, x6ByteLength, NULL );
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237 taskEXIT_CRITICAL();
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238 configASSERT( xReturned == x6ByteLength );
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239 ( void ) xReturned; /* In case configASSERT() is not defined. */
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241 /* The space in the buffer will have reduced by the amount of user data
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242 written into the buffer. */
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243 xExpectedSpace -= x6ByteLength;
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244 xReturned = xStreamBufferSpacesAvailable( xStreamBuffer );
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245 configASSERT( xReturned == xExpectedSpace );
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246 ( void ) xReturned; /* In case configASSERT() is not defined. */
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247 xReturned = xStreamBufferBytesAvailable( xStreamBuffer );
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248 /* +1 as it is zero indexed. */
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249 configASSERT( xReturned == ( ( xItem + 1 ) * x6ByteLength ) );
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250 ( void ) xReturned; /* In case configASSERT() is not defined. */
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253 /* Now the buffer should be full, and attempting to add anything will should
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255 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdTRUE );
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256 xReturned = xStreamBufferSend( xStreamBuffer, ( void * ) pucData, sizeof( pucData[ 0 ] ), sbDONT_BLOCK );
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257 configASSERT( xReturned == 0 );
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258 ( void ) xReturned; /* In case configASSERT() is not defined. */
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260 /* Adding with a timeout should also fail after the appropriate time. The
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261 priority is temporarily boosted in this part of the test to keep the
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262 allowable margin to a minimum. */
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263 uxOriginalPriority = uxTaskPriorityGet( NULL );
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264 vTaskPrioritySet( NULL, configMAX_PRIORITIES - 1 );
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265 xTimeBeforeCall = xTaskGetTickCount();
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266 xReturned = xStreamBufferSend( xStreamBuffer, ( void * ) pucData, sizeof( pucData[ 0 ] ), xBlockTime );
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267 xTimeAfterCall = xTaskGetTickCount();
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268 vTaskPrioritySet( NULL, uxOriginalPriority );
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269 configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) >= xBlockTime );
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270 configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) < ( xBlockTime + xAllowableMargin ) );
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271 configASSERT( xReturned == 0 ); /* In case configASSERT() is not defined. */
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272 ( void ) xTimeAfterCall;
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273 ( void ) xTimeBeforeCall;
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276 /* The buffer is now full of data in the form "000000", "111111", etc. Make
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277 sure the data is read out as expected. */
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278 for( xItem = 0; xItem < xMax6ByteMessages; xItem++ )
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280 /* Generate the data that is expected to be read out for this loop
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282 memset( ( void * ) pucData, ( ( int ) '0' ) + ( int ) xItem, x6ByteLength );
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284 /* Read the next 6 bytes out. The 'FromISR' version is used to give it
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285 some exercise as a block time is not used, so a it must be called from
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286 a critical section so this will work on ports that don't support
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287 interrupt nesting (so don't have interrupt safe critical sections). */
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288 taskENTER_CRITICAL();
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290 xReturned = xStreamBufferReceiveFromISR( xStreamBuffer, ( void * ) pucReadData, x6ByteLength, NULL );
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292 taskEXIT_CRITICAL();
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293 configASSERT( xReturned == x6ByteLength );
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295 /* Does the data read out match that expected? */
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296 configASSERT( memcmp( ( void * ) pucData, ( void * ) pucReadData, x6ByteLength ) == 0 );
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298 /* The space in the buffer will have increased by the amount of user
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299 data removed from the buffer. */
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300 xExpectedSpace += x6ByteLength;
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301 xReturned = xStreamBufferSpacesAvailable( xStreamBuffer );
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302 configASSERT( xReturned == xExpectedSpace );
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303 xReturned = xStreamBufferBytesAvailable( xStreamBuffer );
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304 configASSERT( xReturned == ( sbSTREAM_BUFFER_LENGTH_BYTES - xExpectedSpace ) );
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307 /* The buffer should be empty again. */
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308 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdTRUE );
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309 xExpectedSpace = xStreamBufferSpacesAvailable( xStreamBuffer );
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310 configASSERT( xExpectedSpace == sbSTREAM_BUFFER_LENGTH_BYTES );
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312 /* Reading with a timeout should also fail after the appropriate time. The
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313 priority is temporarily boosted in this part of the test to keep the
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314 allowable margin to a minimum. */
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315 vTaskPrioritySet( NULL, configMAX_PRIORITIES - 1 );
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316 xTimeBeforeCall = xTaskGetTickCount();
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317 xReturned = xStreamBufferReceive( xStreamBuffer, ( void * ) pucReadData, x6ByteLength, xBlockTime );
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318 xTimeAfterCall = xTaskGetTickCount();
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319 vTaskPrioritySet( NULL, uxOriginalPriority );
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320 configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) >= xBlockTime );
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321 configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) < ( xBlockTime + xAllowableMargin ) );
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322 configASSERT( xReturned == 0 );
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325 /* In the next loop 17 bytes are written to then read out on each
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326 iteration. As 30 is not divisible by 17 the data will wrap around. */
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327 xExpectedSpace = sbSTREAM_BUFFER_LENGTH_BYTES - x17ByteLength;
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329 for( xItem = 0; xItem < 100; xItem++ )
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331 /* Generate recognisable data to write to the queue. This is just
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332 ascii characters that shows which loop iteration the data was written
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334 memset( ( void * ) pucData, ( ( int ) '0' ) + ( int ) xItem, x17ByteLength );
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335 xReturned = xStreamBufferSend( xStreamBuffer, ( void * ) pucData, x17ByteLength, sbDONT_BLOCK );
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336 configASSERT( xReturned == x17ByteLength );
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338 /* The space in the buffer will have reduced by the amount of user data
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339 written into the buffer. */
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340 xReturned = xStreamBufferSpacesAvailable( xStreamBuffer );
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341 configASSERT( xReturned == xExpectedSpace );
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342 xReturned = xStreamBufferBytesAvailable( xStreamBuffer );
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343 configASSERT( xReturned == x17ByteLength );
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344 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdFALSE );
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345 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdFALSE );
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347 /* Read the 17 bytes out again. */
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348 xReturned = xStreamBufferReceive( xStreamBuffer, ( void * ) pucReadData, x17ByteLength, sbDONT_BLOCK );
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349 configASSERT( xReturned == x17ByteLength );
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351 /* Does the data read out match that expected? */
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352 configASSERT( memcmp( ( void * ) pucData, ( void * ) pucReadData, x17ByteLength ) == 0 );
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354 /* Full buffer space available again. */
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355 xReturned = xStreamBufferSpacesAvailable( xStreamBuffer );
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356 configASSERT( xReturned == sbSTREAM_BUFFER_LENGTH_BYTES );
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357 xReturned = xStreamBufferBytesAvailable( xStreamBuffer );
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358 configASSERT( xReturned == 0 );
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359 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdFALSE );
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360 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdTRUE );
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363 /* Fill the buffer with one message, check it is full, then read it back
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364 again and check the correct data is received. */
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365 xStreamBufferSend( xStreamBuffer, ( const void * ) pc55ByteString, sbSTREAM_BUFFER_LENGTH_BYTES, sbDONT_BLOCK );
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366 xStreamBufferReceive( xStreamBuffer, ( void * ) pucFullBuffer, sbSTREAM_BUFFER_LENGTH_BYTES, sbDONT_BLOCK );
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367 configASSERT( memcmp( pc55ByteString, pucFullBuffer, sbSTREAM_BUFFER_LENGTH_BYTES ) == 0 );
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369 /* Fill the buffer one bytes at a time. */
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370 for( xItem = 0; xItem < sbSTREAM_BUFFER_LENGTH_BYTES; xItem++ )
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372 /* Block time is only for test coverage, the task should never actually
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374 xStreamBufferSend( xStreamBuffer, ( const void * ) &( pc54ByteString[ xItem ] ), sizeof( char ), sbRX_TX_BLOCK_TIME );
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377 /* The buffer should now be full. */
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378 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdTRUE );
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380 /* Read the message out in one go, even though it was written in individual
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381 bytes. Try reading much more data than is actually available to ensure only
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382 the available bytes are returned (otherwise this read will write outside of
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383 the memory allocated anyway!). */
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384 xReturned = xStreamBufferReceive( xStreamBuffer, pucFullBuffer, sbSTREAM_BUFFER_LENGTH_BYTES * ( size_t ) 2, sbRX_TX_BLOCK_TIME );
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385 configASSERT( xReturned == sbSTREAM_BUFFER_LENGTH_BYTES );
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386 configASSERT( memcmp( ( const void * ) pc54ByteString, ( const void * ) pucFullBuffer, sbSTREAM_BUFFER_LENGTH_BYTES ) == 0 );
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388 /* Now do the opposite, write in one go and read out in single bytes. */
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389 xReturned = xStreamBufferSend( xStreamBuffer, ( const void * ) pc55ByteString, sbSTREAM_BUFFER_LENGTH_BYTES, sbRX_TX_BLOCK_TIME );
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390 configASSERT( xReturned == sbSTREAM_BUFFER_LENGTH_BYTES );
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391 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdTRUE );
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392 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdFALSE );
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393 configASSERT( xStreamBufferBytesAvailable( xStreamBuffer ) == sbSTREAM_BUFFER_LENGTH_BYTES );
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394 configASSERT( xStreamBufferSpacesAvailable( xStreamBuffer ) == 0 );
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396 /* Read from the buffer one byte at a time. */
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397 for( xItem = 0; xItem < sbSTREAM_BUFFER_LENGTH_BYTES; xItem++ )
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399 /* Block time is only for test coverage, the task should never actually
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401 xStreamBufferReceive( xStreamBuffer, ( void * ) pucFullBuffer, sizeof( char ), sbRX_TX_BLOCK_TIME );
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402 configASSERT( pc55ByteString[ xItem ] == pucFullBuffer[ 0 ] );
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404 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdTRUE );
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405 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdFALSE );
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407 /* Try writing more bytes than there is space. */
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408 vTaskPrioritySet( NULL, configMAX_PRIORITIES - 1 );
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409 xTimeBeforeCall = xTaskGetTickCount();
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410 xReturned = xStreamBufferSend( xStreamBuffer, ( const void * ) pc54ByteString, sbSTREAM_BUFFER_LENGTH_BYTES * ( size_t ) 2, xMinimalBlockTime );
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411 xTimeAfterCall = xTaskGetTickCount();
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412 vTaskPrioritySet( NULL, uxOriginalPriority );
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413 configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) >= xMinimalBlockTime );
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414 configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) < ( xMinimalBlockTime + xAllowableMargin ) );
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415 configASSERT( xReturned == sbSTREAM_BUFFER_LENGTH_BYTES );
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416 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdTRUE );
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417 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdFALSE );
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419 /* No space now though. */
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420 xReturned = xStreamBufferSend( xStreamBuffer, ( const void * ) pc54ByteString, sbSTREAM_BUFFER_LENGTH_BYTES * ( size_t ) 2, xMinimalBlockTime );
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421 configASSERT( xReturned == 0 );
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423 /* Ensure data was written as expected even when there was an attempt to
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424 write more than was available. This also tries to read more bytes than are
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426 xReturned = xStreamBufferReceive( xStreamBuffer, ( void * ) pucFullBuffer, xFullBufferSize, xMinimalBlockTime );
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427 configASSERT( memcmp( ( const void * ) pucFullBuffer, ( const void * ) pc54ByteString, sbSTREAM_BUFFER_LENGTH_BYTES ) == 0 );
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428 configASSERT( xStreamBufferIsFull( xStreamBuffer ) == pdFALSE );
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429 configASSERT( xStreamBufferIsEmpty( xStreamBuffer ) == pdTRUE );
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431 /* Clean up with data in the buffer to ensure the tests that follow don't
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432 see the data (the data should be discarded). */
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433 ( void ) xStreamBufferSend( xStreamBuffer, ( const void * ) pc55ByteString, sbSTREAM_BUFFER_LENGTH_BYTES / ( size_t ) 2, sbDONT_BLOCK );
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434 vPortFree( pucFullBuffer );
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435 xStreamBufferReset( xStreamBuffer );
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437 /*-----------------------------------------------------------*/
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439 static void prvNonBlockingSenderTask( void *pvParameters )
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441 StreamBufferHandle_t xStreamBuffer;
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442 size_t xNextChar = 0, xBytesToSend, xBytesActuallySent;
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443 const size_t xStringLength = strlen( pc54ByteString );
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445 /* In this case the stream buffer has already been created and is passed
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446 into the task using the task's parameter. */
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447 xStreamBuffer = ( StreamBufferHandle_t ) pvParameters;
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449 /* Keep sending the string to the stream buffer as many bytes as possible in
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450 each go. Doesn't block so calls can interleave with the non-blocking
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451 receives performed by prvNonBlockingReceiverTask(). */
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454 /* The whole string cannot be sent at once, so xNextChar is an index to
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455 the position within the string that has been sent so far. How many
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456 bytes are there left to send before the end of the string? */
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457 xBytesToSend = xStringLength - xNextChar;
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459 /* Attempt to send right up to the end of the string. */
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460 xBytesActuallySent = xStreamBufferSend( xStreamBuffer, ( const void * ) &( pc54ByteString[ xNextChar ] ), xBytesToSend, sbDONT_BLOCK );
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461 configASSERT( xBytesActuallySent <= xBytesToSend );
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463 /* Move the index up the string to the next character to be sent,
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464 wrapping if the end of the string has been reached. */
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465 xNextChar += xBytesActuallySent;
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466 configASSERT( xNextChar <= xStringLength );
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468 if( xNextChar == xStringLength )
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474 /*-----------------------------------------------------------*/
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476 static void prvNonBlockingReceiverTask( void *pvParameters )
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478 StreamBufferHandle_t xStreamBuffer;
\r
479 size_t xNextChar = 0, xReceiveLength, xBytesToTest, xStartIndex;
\r
480 const size_t xStringLength = strlen( pc54ByteString );
\r
481 char cRxString[ 12 ]; /* Holds received characters. */
\r
482 BaseType_t xNonBlockingReceiveError = pdFALSE;
\r
484 /* In this case the stream buffer has already been created and is passed
\r
485 into the task using the task's parameter. */
\r
486 xStreamBuffer = ( StreamBufferHandle_t ) pvParameters;
\r
488 /* Expects to receive the pc54ByteString over and over again. Sends and
\r
489 receives are not blocking so will interleave. */
\r
492 /* Attempt to receive as many bytes as possible, up to the limit of the
\r
494 xReceiveLength = xStreamBufferReceive( xStreamBuffer, ( void * ) cRxString, sizeof( cRxString ), sbDONT_BLOCK );
\r
496 if( xReceiveLength > 0 )
\r
498 /* xNextChar is the index into pc54ByteString that has been received
\r
499 already. If xReceiveLength bytes are added to that, will it go off
\r
500 the end of the string? If so, then first test up to the end of the
\r
501 string, then go back to the start of pc54ByteString to test the
\r
502 remains of the received data. */
\r
503 xBytesToTest = xReceiveLength;
\r
504 if( ( xNextChar + xBytesToTest ) > xStringLength )
\r
506 /* Cap to test the received data to the end of the string. */
\r
507 xBytesToTest = xStringLength - xNextChar;
\r
509 if( memcmp( ( const void * ) &( pc54ByteString[ xNextChar ] ), ( const void * ) cRxString, xBytesToTest ) != 0 )
\r
511 xNonBlockingReceiveError = pdTRUE;
\r
514 /* Then move back to the start of the string to test the
\r
515 remaining received bytes. */
\r
517 xStartIndex = xBytesToTest;
\r
518 xBytesToTest = xReceiveLength - xBytesToTest;
\r
522 /* The string didn't wrap in the buffer, so start comparing from
\r
523 the start of the received data. */
\r
527 /* Test the received bytes are as expected, then move the index
\r
528 along the string to the next expected char to receive. */
\r
529 if( memcmp( ( const void * ) &( pc54ByteString[ xNextChar ] ), ( const void * ) &( cRxString[ xStartIndex ] ), xBytesToTest ) != 0 )
\r
531 xNonBlockingReceiveError = pdTRUE;
\r
534 if( xNonBlockingReceiveError == pdFALSE )
\r
536 /* No errors detected so increment the counter that lets the
\r
537 check task know this test is still functioning correctly. */
\r
538 ulNonBlockingRxCounter++;
\r
541 xNextChar += xBytesToTest;
\r
542 if( xNextChar >= xStringLength )
\r
549 /*-----------------------------------------------------------*/
\r
551 #if( configSUPPORT_STATIC_ALLOCATION == 1 )
\r
553 static void prvSenderTask( void *pvParameters )
\r
555 StreamBufferHandle_t xStreamBuffer, xTempStreamBuffer;
\r
556 static uint8_t ucTempBuffer[ 10 ]; /* Just used to exercise stream buffer creating and deletion. */
\r
557 const TickType_t xTicksToWait = sbRX_TX_BLOCK_TIME, xShortDelay = pdMS_TO_TICKS( 50 );
\r
558 StaticStreamBuffer_t xStaticStreamBuffer;
\r
559 size_t xNextChar = 0, xBytesToSend, xBytesActuallySent;
\r
560 const size_t xStringLength = strlen( pc55ByteString );
\r
562 /* The task's priority is used as an index into the loop counters used to
\r
563 indicate this task is still running. */
\r
564 UBaseType_t uxIndex = uxTaskPriorityGet( NULL );
\r
566 /* Make sure a change in priority does not inadvertently result in an
\r
567 invalid array index. */
\r
568 configASSERT( uxIndex < sbNUMBER_OF_ECHO_CLIENTS );
\r
570 /* Avoid compiler warnings about unused parameters. */
\r
571 ( void ) pvParameters;
\r
573 xStreamBuffer = xStreamBufferCreateStatic( sizeof( ucBufferStorage ) / sbNUMBER_OF_SENDER_TASKS, /* The number of bytes in each buffer in the array. */
\r
574 sbTRIGGER_LEVEL_1, /* The number of bytes to be in the buffer before a task blocked to wait for data is unblocked. */
\r
575 &( ucBufferStorage[ uxIndex ][ 0 ] ), /* The address of the buffer to use within the array. */
\r
576 &( xStaticStreamBuffers[ uxIndex ] ) ); /* The static stream buffer structure to use within the array. */
\r
578 /* Now the stream buffer has been created the receiver task can be
\r
579 created. If this sender task has the higher priority then the receiver
\r
580 task is created at the lower priority - if this sender task has the
\r
581 lower priority then the receiver task is created at the higher
\r
583 if( uxTaskPriorityGet( NULL ) == sbLOWER_PRIORITY )
\r
585 /* Here prvSingleTaskTests() performs various tests on a stream buffer
\r
586 that was created statically. */
\r
587 prvSingleTaskTests( xStreamBuffer );
\r
588 xTaskCreate( prvReceiverTask, "StrReceiver", sbSTACK_SIZE, ( void * ) xStreamBuffer, sbHIGHER_PRIORITY, NULL );
\r
592 xTaskCreate( prvReceiverTask, "StrReceiver", sbSTACK_SIZE, ( void * ) xStreamBuffer, sbLOWER_PRIORITY, NULL );
\r
597 /* The whole string cannot be sent at once, so xNextChar is an index
\r
598 to the position within the string that has been sent so far. How
\r
599 many bytes are there left to send before the end of the string? */
\r
600 xBytesToSend = xStringLength - xNextChar;
\r
602 /* Attempt to send right up to the end of the string. */
\r
603 xBytesActuallySent = xStreamBufferSend( xStreamBuffer, ( const void * ) &( pc55ByteString[ xNextChar ] ), xBytesToSend, xTicksToWait );
\r
604 configASSERT( xBytesActuallySent <= xBytesToSend );
\r
606 /* Move the index up the string to the next character to be sent,
\r
607 wrapping if the end of the string has been reached. */
\r
608 xNextChar += xBytesActuallySent;
\r
609 configASSERT( xNextChar <= xStringLength );
\r
611 if( xNextChar == xStringLength )
\r
616 /* Increment a loop counter so a check task can tell this task is
\r
617 still running as expected. */
\r
618 ulSenderLoopCounters[ uxIndex ]++;
\r
620 if( uxTaskPriorityGet( NULL ) == sbHIGHER_PRIORITY )
\r
622 /* Allow other tasks to run. */
\r
623 vTaskDelay( xShortDelay );
\r
626 /* This stream buffer is just created and deleted to ensure no
\r
627 issues when attempting to delete a stream buffer that was
\r
628 created using statically allocated memory. To save stack space
\r
629 the buffer is set to point to the pc55ByteString, which is a const
\r
630 string, but no data is written into the buffer so any valid address
\r
632 xTempStreamBuffer = xStreamBufferCreateStatic( sizeof( ucTempBuffer ), sbTRIGGER_LEVEL_1, ucTempBuffer, &xStaticStreamBuffer );
\r
633 vStreamBufferDelete( xTempStreamBuffer );
\r
637 #endif /* configSUPPORT_STATIC_ALLOCATION */
\r
638 /*-----------------------------------------------------------*/
\r
640 #if( configSUPPORT_STATIC_ALLOCATION == 1 )
\r
642 static void prvReceiverTask( void *pvParameters )
\r
644 StreamBufferHandle_t * const pxStreamBuffer = ( StreamBufferHandle_t * ) pvParameters;
\r
645 char cRxString[ 12 ]; /* Large enough to hold a 32-bit number in ASCII. */
\r
646 const TickType_t xTicksToWait = pdMS_TO_TICKS( 5UL );
\r
647 const size_t xStringLength = strlen( pc55ByteString );
\r
648 size_t xNextChar = 0, xReceivedLength, xBytesToReceive;
\r
652 /* Attempt to receive the number of bytes to the end of the string,
\r
653 or the number of byte that can be placed into the rx buffer,
\r
654 whichever is smallest. */
\r
655 xBytesToReceive = configMIN( ( xStringLength - xNextChar ), sizeof( cRxString ) );
\r
659 xReceivedLength = xStreamBufferReceive( pxStreamBuffer, ( void * ) cRxString, xBytesToReceive, xTicksToWait );
\r
661 } while( xReceivedLength == 0 );
\r
663 /* Ensure the received string matches the expected string. */
\r
664 configASSERT( memcmp( ( void * ) cRxString, ( const void * ) &( pc55ByteString[ xNextChar ] ), xReceivedLength ) == 0 );
\r
666 /* Move the index into the string up to the end of the bytes
\r
667 received so far - wrapping if the end of the string has been
\r
669 xNextChar += xReceivedLength;
\r
670 if( xNextChar >= xStringLength )
\r
677 #endif /* configSUPPORT_STATIC_ALLOCATION */
\r
678 /*-----------------------------------------------------------*/
\r
680 static void prvEchoClient( void *pvParameters )
\r
682 size_t xSendLength = 0, ux;
\r
683 char *pcStringToSend, *pcStringReceived, cNextChar = sbASCII_SPACE;
\r
684 const TickType_t xTicksToWait = pdMS_TO_TICKS( 50 );
\r
685 StreamBufferHandle_t xTempStreamBuffer;
\r
687 /* The task's priority is used as an index into the loop counters used to
\r
688 indicate this task is still running. */
\r
689 UBaseType_t uxIndex = uxTaskPriorityGet( NULL );
\r
691 /* Pointers to the client and server stream buffers are passed into this task
\r
692 using the task's parameter. */
\r
693 EchoStreamBuffers_t *pxStreamBuffers = ( EchoStreamBuffers_t * ) pvParameters;
\r
695 /* Prevent compiler warnings. */
\r
696 ( void ) pvParameters;
\r
698 /* Create the buffer into which strings to send to the server will be
\r
699 created, and the buffer into which strings echoed back from the server will
\r
701 pcStringToSend = ( char * ) pvPortMalloc( sbSTREAM_BUFFER_LENGTH_BYTES );
\r
702 pcStringReceived = ( char * ) pvPortMalloc( sbSTREAM_BUFFER_LENGTH_BYTES );
\r
704 configASSERT( pcStringToSend );
\r
705 configASSERT( pcStringReceived );
\r
709 /* Generate the length of the next string to send. */
\r
712 /* The stream buffer is being used to hold variable length data, so
\r
713 each data item requires sizeof( size_t ) bytes to hold the data's
\r
714 length, hence the sizeof() in the if() condition below. */
\r
715 if( xSendLength > ( sbSTREAM_BUFFER_LENGTH_BYTES - sizeof( size_t ) ) )
\r
717 /* Back to a string length of 1. */
\r
718 xSendLength = sizeof( char );
\r
721 memset( pcStringToSend, 0x00, sbSTREAM_BUFFER_LENGTH_BYTES );
\r
723 for( ux = 0; ux < xSendLength; ux++ )
\r
725 pcStringToSend[ ux ] = cNextChar;
\r
729 if( cNextChar > sbASCII_TILDA )
\r
731 cNextChar = sbASCII_SPACE;
\r
735 /* Send the generated string to the buffer. */
\r
738 ux = xStreamBufferSend( pxStreamBuffers->xEchoClientBuffer, ( void * ) pcStringToSend, xSendLength, xTicksToWait );
\r
740 } while( ux == 0 );
\r
742 /* Wait for the string to be echoed back. */
\r
743 memset( pcStringReceived, 0x00, sbSTREAM_BUFFER_LENGTH_BYTES );
\r
744 xStreamBufferReceive( pxStreamBuffers->xEchoServerBuffer, ( void * ) pcStringReceived, xSendLength, portMAX_DELAY );
\r
746 configASSERT( strcmp( pcStringToSend, pcStringReceived ) == 0 );
\r
748 /* Maintain a count of the number of times this code executes so a
\r
749 check task can determine if this task is still functioning as
\r
750 expected or not. As there are two client tasks, and the priorities
\r
751 used are 0 and 1, the task's priority is used as an index into the
\r
752 loop count array. */
\r
753 ulEchoLoopCounters[ uxIndex ]++;
\r
755 /* This stream buffer is just created and deleted to ensure no memory
\r
757 xTempStreamBuffer = xStreamBufferCreate( sbSTREAM_BUFFER_LENGTH_BYTES, sbTRIGGER_LEVEL_1 );
\r
758 prvSingleTaskTests( xTempStreamBuffer );
\r
759 vStreamBufferDelete( xTempStreamBuffer );
\r
762 /*-----------------------------------------------------------*/
\r
764 static void prvEchoServer( void *pvParameters )
\r
766 size_t xReceivedLength;
\r
767 char *pcReceivedString;
\r
768 EchoStreamBuffers_t xStreamBuffers;
\r
769 TickType_t xTimeOnEntering;
\r
770 const TickType_t xTicksToBlock = pdMS_TO_TICKS( 350UL );
\r
772 /* Prevent compiler warnings about unused parameters. */
\r
773 ( void ) pvParameters;
\r
775 /* Create the stream buffer used to send data from the client to the server,
\r
776 and the stream buffer used to echo the data from the server back to the
\r
778 xStreamBuffers.xEchoClientBuffer = xStreamBufferCreate( sbSTREAM_BUFFER_LENGTH_BYTES, sbTRIGGER_LEVEL_1 );
\r
779 xStreamBuffers.xEchoServerBuffer = xStreamBufferCreate( sbSTREAM_BUFFER_LENGTH_BYTES, sbTRIGGER_LEVEL_1 );
\r
780 configASSERT( xStreamBuffers.xEchoClientBuffer );
\r
781 configASSERT( xStreamBuffers.xEchoServerBuffer );
\r
783 /* Create the buffer into which received strings will be copied. */
\r
784 pcReceivedString = ( char * ) pvPortMalloc( sbSTREAM_BUFFER_LENGTH_BYTES );
\r
785 configASSERT( pcReceivedString );
\r
787 /* Don't expect to receive anything yet! */
\r
788 xTimeOnEntering = xTaskGetTickCount();
\r
789 xReceivedLength = xStreamBufferReceive( xStreamBuffers.xEchoClientBuffer, ( void * ) pcReceivedString, sbSTREAM_BUFFER_LENGTH_BYTES, xTicksToBlock );
\r
790 configASSERT( ( xTaskGetTickCount() - xTimeOnEntering ) >= xTicksToBlock );
\r
791 configASSERT( xReceivedLength == 0 );
\r
792 ( void ) xTimeOnEntering;
\r
794 /* Now the stream buffers have been created the echo client task can be
\r
795 created. If this server task has the higher priority then the client task
\r
796 is created at the lower priority - if this server task has the lower
\r
797 priority then the client task is created at the higher priority. */
\r
798 if( uxTaskPriorityGet( NULL ) == sbLOWER_PRIORITY )
\r
800 xTaskCreate( prvEchoClient, "EchoClient", sbSTACK_SIZE, ( void * ) &xStreamBuffers, sbHIGHER_PRIORITY, NULL );
\r
804 /* Here prvSingleTaskTests() performs various tests on a stream buffer
\r
805 that was created dynamically. */
\r
806 prvSingleTaskTests( xStreamBuffers.xEchoClientBuffer );
\r
807 xTaskCreate( prvEchoClient, "EchoClient", sbSTACK_SIZE, ( void * ) &xStreamBuffers, sbLOWER_PRIORITY, NULL );
\r
812 memset( pcReceivedString, 0x00, sbSTREAM_BUFFER_LENGTH_BYTES );
\r
814 /* Has any data been sent by the client? */
\r
815 xReceivedLength = xStreamBufferReceive( xStreamBuffers.xEchoClientBuffer, ( void * ) pcReceivedString, sbSTREAM_BUFFER_LENGTH_BYTES, xTicksToBlock );
\r
817 /* Should always receive data as a delay was used. */
\r
818 configASSERT( xReceivedLength > 0 );
\r
820 /* Echo the received data back to the client. */
\r
821 xStreamBufferSend( xStreamBuffers.xEchoServerBuffer, ( void * ) pcReceivedString, xReceivedLength, portMAX_DELAY );
\r
824 /*-----------------------------------------------------------*/
\r
826 void vPeriodicStreamBufferProcessing( void )
\r
828 static size_t xNextChar = 0;
\r
829 BaseType_t xHigherPriorityTaskWoken = pdFALSE;
\r
831 /* Called from the tick interrupt hook. If the global stream buffer
\r
832 variable is not NULL then the prvInterruptTriggerTest() task expects a byte
\r
833 to be sent to the stream buffer on each tick interrupt. */
\r
834 if( xInterruptStreamBuffer != NULL )
\r
836 /* One character from the pcDataSentFromInterrupt string is sent on each
\r
837 interrupt. The task blocked on the stream buffer should not be
\r
838 unblocked until the defined trigger level is hit. */
\r
839 xStreamBufferSendFromISR( xInterruptStreamBuffer, ( const void * ) &( pcDataSentFromInterrupt[ xNextChar ] ), sizeof( char ), &xHigherPriorityTaskWoken );
\r
841 if( xNextChar < strlen( pcDataSentFromInterrupt ) )
\r
848 /* Start at the beginning of the string being sent again. */
\r
852 /*-----------------------------------------------------------*/
\r
854 static void prvInterruptTriggerLevelTest( void *pvParameters )
\r
856 StreamBufferHandle_t xStreamBuffer;
\r
857 size_t xTriggerLevel = 1, xBytesReceived;
\r
858 const size_t xStreamBufferSizeBytes = ( size_t ) 8, xMaxTriggerLevel = ( size_t ) 6, xMinTriggerLevel = ( size_t ) 1;
\r
859 const TickType_t xReadBlockTime = 4, xCycleBlockTime = pdMS_TO_TICKS( 100 );
\r
860 uint8_t ucRxData[ 8 ];
\r
861 BaseType_t xErrorDetected = pdFALSE;
\r
862 #ifndef configSTREAM_BUFFER_TRIGGER_LEVEL_TEST_MARGIN
\r
863 const size_t xAllowableMargin = ( size_t ) 0;
\r
865 const size_t xAllowableMargin = ( size_t ) configSTREAM_BUFFER_TRIGGER_LEVEL_TEST_MARGIN;
\r
868 /* Remove compiler warning about unused parameter. */
\r
869 ( void ) pvParameters;
\r
873 for( xTriggerLevel = xMinTriggerLevel; xTriggerLevel < xMaxTriggerLevel; xTriggerLevel++ )
\r
875 /* Create the stream buffer that will be used from inside the tick
\r
877 xStreamBuffer = xStreamBufferCreate( xStreamBufferSizeBytes, xTriggerLevel );
\r
878 configASSERT( xStreamBuffer );
\r
880 /* Now the stream buffer has been created it can be assigned to the
\r
881 file scope variable, which will allow the tick interrupt to start
\r
883 taskENTER_CRITICAL();
\r
885 xInterruptStreamBuffer = xStreamBuffer;
\r
887 taskEXIT_CRITICAL();
\r
889 xBytesReceived = xStreamBufferReceive( xStreamBuffer, ( void * ) ucRxData, sizeof( ucRxData ), xReadBlockTime );
\r
891 /* Set the file scope variable back to NULL so the interrupt doesn't
\r
892 try to use it again. */
\r
893 taskENTER_CRITICAL();
\r
895 xInterruptStreamBuffer = NULL;
\r
897 taskEXIT_CRITICAL();
\r
899 /* Now check the number of bytes received equals the trigger level,
\r
900 except in the case that the read timed out before the trigger level
\r
902 if( xBytesReceived < xTriggerLevel )
\r
904 /* This should only happen if the trigger level was greater than
\r
906 if( xTriggerLevel < xReadBlockTime )
\r
908 xErrorDetected = pdTRUE;
\r
911 else if( ( xBytesReceived - xTriggerLevel ) > xAllowableMargin )
\r
913 /* A margin may be required here if there are other high priority
\r
914 tasks prevent the task that reads from the message buffer running
\r
916 xErrorDetected = pdTRUE;
\r
919 if( xBytesReceived > sizeof( ucRxData ) )
\r
921 xErrorDetected = pdTRUE;
\r
923 else if( memcmp( ( void * ) ucRxData, ( const void * ) pcDataSentFromInterrupt, xBytesReceived ) != 0 )
\r
925 /* Received data didn't match that expected. */
\r
926 xErrorDetected = pdTRUE;
\r
929 if( xErrorDetected == pdFALSE )
\r
931 /* Increment the cycle counter so the 'check' task knows this test
\r
932 is still running without error. */
\r
933 ulInterruptTriggerCounter++;
\r
936 /* Tidy up ready for the next loop. */
\r
937 vStreamBufferDelete( xStreamBuffer );
\r
938 vTaskDelay( xCycleBlockTime );
\r
942 /*-----------------------------------------------------------*/
\r
944 BaseType_t xAreStreamBufferTasksStillRunning( void )
\r
946 static uint32_t ulLastEchoLoopCounters[ sbNUMBER_OF_ECHO_CLIENTS ] = { 0 };
\r
947 static uint32_t ulLastNonBlockingRxCounter = 0;
\r
948 static uint32_t ulLastInterruptTriggerCounter = 0;
\r
949 BaseType_t xReturn = pdPASS, x;
\r
951 for( x = 0; x < sbNUMBER_OF_ECHO_CLIENTS; x++ )
\r
953 if( ulLastEchoLoopCounters[ x ] == ulEchoLoopCounters[ x ] )
\r
959 ulLastEchoLoopCounters[ x ] = ulEchoLoopCounters[ x ];
\r
963 if( ulNonBlockingRxCounter == ulLastNonBlockingRxCounter )
\r
969 ulLastNonBlockingRxCounter = ulNonBlockingRxCounter;
\r
972 if( ulLastInterruptTriggerCounter == ulInterruptTriggerCounter )
\r
978 ulLastInterruptTriggerCounter = ulInterruptTriggerCounter;
\r
981 #if( configSUPPORT_STATIC_ALLOCATION == 1 )
\r
983 static uint32_t ulLastSenderLoopCounters[ sbNUMBER_OF_ECHO_CLIENTS ] = { 0 };
\r
985 for( x = 0; x < sbNUMBER_OF_SENDER_TASKS; x++ )
\r
987 if( ulLastSenderLoopCounters[ x ] == ulSenderLoopCounters[ x ] )
\r
993 ulLastSenderLoopCounters[ x ] = ulSenderLoopCounters[ x ];
\r
997 #endif /* configSUPPORT_STATIC_ALLOCATION */
\r
1001 /*-----------------------------------------------------------*/
\r