2 FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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97 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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99 *NOTE* - This file is designed to test some of the RTOS features - it is
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100 not intended to represent an efficient implementation!
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103 /* Standard includes. */
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104 #include <stdlib.h>
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106 /* Scheduler includes. */
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107 #include "FreeRTOS.h"
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110 /* Demo application includes. */
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111 #include "serial.h"
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114 /* Hardware specifics. */
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115 #define serRX_DATA_PIN ( 0x01 )
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116 #define serTX_DATA_PIN ( 0x02 )
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117 #define serCLOCK_Fxx_DIV_8 0x03
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118 #define serUPWR ( 0x80 )
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119 #define serUTXE ( 0x40 )
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120 #define serURXE ( 0x20 )
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121 #define serUCL ( 0x02 )
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122 #define serLSB ( 0x10 )
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125 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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126 #define serHANDLE ( ( xComPortHandle ) 1 )
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127 #define serNO_BLOCK ( ( TickType_t ) 0 )
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129 /*-----------------------------------------------------------*/
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131 /* Queues used to hold received characters, and characters waiting to be
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133 static QueueHandle_t xRxedChars;
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134 static QueueHandle_t xCharsForTx;
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136 /*-----------------------------------------------------------*/
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138 /* Interrupt entry point written in the assembler file serialISR.s85. */
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139 extern void vSerialISREntry( void );
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141 /* Flag to indicate whether or not there are characters already queued to send. */
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142 static volatile unsigned long ulTxInProgress = pdFALSE;
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144 /*-----------------------------------------------------------*/
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147 * See the serial2.h header file.
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149 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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151 xComPortHandle xReturn = serHANDLE;
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152 const unsigned long ulFuclk = ( configCPU_CLOCK_HZ / 2 ) / 8UL;
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154 /* Create the queues used to hold Rx and Tx characters. */
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155 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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156 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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158 /* If the queues were created correctly then setup the serial port
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160 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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162 portENTER_CRITICAL();
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164 /* Set the UART0 Rx and Tx pins to their alternative function. */
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165 PMC3 |= ( serRX_DATA_PIN | serTX_DATA_PIN );
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166 PM3 &= ~( serTX_DATA_PIN );
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168 /* Setup clock for required baud. */
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169 UD0CTL1 = serCLOCK_Fxx_DIV_8;
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170 UD0CTL2 = ulFuclk / ( 2 * ulWantedBaud );
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172 /* Enable, n81. */
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173 UD0CTL0 = ( serUPWR | serUTXE | serURXE | serUCL | serLSB );
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175 /* Enable interrupts for both Rx and Tx. */
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179 ulTxInProgress = pdFALSE;
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181 portEXIT_CRITICAL();
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185 xReturn = ( xComPortHandle ) 0;
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188 /* This demo file only supports a single port but we have to return
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189 something to comply with the standard demo header file. */
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192 /*-----------------------------------------------------------*/
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194 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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196 /* The port handle is not required as this driver only supports one port. */
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199 /* Get the next character from the buffer. Return false if no characters
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200 are available, or arrive before xBlockTime expires. */
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201 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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210 /*-----------------------------------------------------------*/
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212 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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214 signed char *pxNext;
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216 /* A couple of parameters that this port does not use. */
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217 ( void ) usStringLength;
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220 /* NOTE: This implementation does not handle the queue being full as no
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221 block time is used! */
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223 /* The port handle is not required as this driver only supports UART0. */
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226 /* Send each character in the string, one at a time. */
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227 pxNext = ( signed char * ) pcString;
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230 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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234 /*-----------------------------------------------------------*/
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236 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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238 portBASE_TYPE xReturn = pdPASS;
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240 portENTER_CRITICAL();
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242 /* There are currently no characters queued up to send so write the
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243 character directly to the UART. */
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244 if( ulTxInProgress == pdFALSE )
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247 ulTxInProgress = pdTRUE;
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251 /* The UART is already busy so write the character to the Tx queue.
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252 The queue is drained from within the Tx interrupt. */
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253 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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259 portEXIT_CRITICAL();
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263 /*-----------------------------------------------------------*/
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265 void vSerialClose( xComPortHandle xPort )
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267 /* Not supported as not required by the demo application. */
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269 /*-----------------------------------------------------------*/
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271 /* Tx interrupt handler. This is called from the asm file wrapper. */
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272 void vUARTTxISRHandler( void )
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275 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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277 /* Are there any more characters queue to transmit? */
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278 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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280 /* Send the next character. */
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285 /* The UART is no longer active. */
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286 ulTxInProgress = pdFALSE;
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289 /* If reading a character from the Rx queue caused a task to unblock, and
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290 the unblocked task has a priority higher than the currently running task,
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291 then xHigherPriorityTaskWoken will have been set to true and a context
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292 switch should occur now. */
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293 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
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295 /*-----------------------------------------------------------*/
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297 /* Rx interrupt handler. This is called from the asm file wrapper. */
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298 void vUARTRxISRHandler( void )
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301 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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303 /* Send the received character to the Rx queue. */
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305 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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307 /* If sending a character to the Tx queue caused a task to unblock, and
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308 the unblocked task has a priority higher than the currently running task,
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309 then xHigherPriorityTaskWoken will have been set to true and a context
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310 switch should occur now. */
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311 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
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