2 FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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65 /* Basic interrupt driven serial port driver for uart1.
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68 /* Standard includes. */
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71 /* Kernel includes. */
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72 #include "FreeRTOS.h"
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76 /* Demo application includes. */
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77 #include <machine/uart.h>
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78 #include <machine/ic.h>
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80 /*-----------------------------------------------------------*/
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82 #define comBLOCK_RETRY_TIME 10
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83 /*-----------------------------------------------------------*/
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85 /* The interrupt handlers are naked functions that call C handlers. The C
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86 handlers are marked as noinline to ensure they work correctly when the
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88 void interrupt5_handler( void ) __attribute__((naked));
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89 static void prvTxHandler( void ) __attribute__((noinline));
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90 void interrupt6_handler( void ) __attribute__((naked));
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91 static void prvRxHandler( void ) __attribute__((noinline));
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93 /*-----------------------------------------------------------*/
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95 /* Queues used to hold received characters, and characters waiting to be
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97 static xQueueHandle xRxedChars;
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98 static xQueueHandle xCharsForTx;
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99 /*-----------------------------------------------------------*/
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101 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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103 /* Create the queues used to hold Rx and Tx characters. */
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104 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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105 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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107 if( ( xRxedChars ) && ( xCharsForTx ) )
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109 /* Set up interrupts */
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110 /* tx interrupt will be enabled when we need to send something */
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111 uart1->tx_mask = 0;
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112 uart1->rx_mask = 1;
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113 irq[IRQ_UART1_TX].ien = 1;
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114 irq[IRQ_UART1_RX].ien = 1;
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117 return ( xComPortHandle ) 0;
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119 /*-----------------------------------------------------------*/
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121 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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123 /* The port handle is not required as this driver only supports uart1. */
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126 /* Get the next character from the buffer. Return false if no characters
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127 are available, or arrive before xBlockTime expires. */
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128 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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137 /*-----------------------------------------------------------*/
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139 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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142 signed char *pChNext;
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144 /* Send each character in the string, one at a time. */
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145 pChNext = ( signed char * )pcString;
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146 for( i = 0; i < usStringLength; i++ )
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148 /* Block until character has been transmitted. */
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149 while( xSerialPutChar( pxPort, *pChNext, comBLOCK_RETRY_TIME ) != pdTRUE ); pChNext++;
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152 /*-----------------------------------------------------------*/
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154 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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158 /* Place the character in the queue of characters to be transmitted. */
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159 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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164 /* Turn on the Tx interrupt so the ISR will remove the character from the
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165 queue and send it. This does not need to be in a critical section as
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166 if the interrupt has already removed the character the next interrupt
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167 will simply turn off the Tx interrupt again. */
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168 uart1->tx_mask = 1;
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172 /*-----------------------------------------------------------*/
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174 void vSerialClose( xComPortHandle xPort )
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176 /* Not supported as not required by the demo application. */
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179 /*-----------------------------------------------------------*/
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181 /* UART Tx interrupt handler. */
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182 void interrupt5_handler( void )
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184 /* This is a naked function. */
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185 portSAVE_CONTEXT();
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187 portRESTORE_CONTEXT();
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189 /*-----------------------------------------------------------*/
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191 static void prvTxHandler( void )
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194 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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196 /* The interrupt was caused by the transmit fifo having space for at least one
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197 character. Are there any more characters to transmit? */
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198 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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200 /* A character was retrieved from the queue so can be sent to the uart now. */
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201 uart1->tx_data = cChar;
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205 /* Queue empty, nothing to send so turn off the Tx interrupt. */
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206 uart1->tx_mask = 0;
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209 /* If an event caused a task to unblock then we call "Yield from ISR" to
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210 ensure that the unblocked task is the task that executes when the interrupt
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211 completes if the unblocked task has a priority higher than the interrupted
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213 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
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215 /*-----------------------------------------------------------*/
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217 /* UART Rx interrupt. */
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218 void interrupt6_handler( void )
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220 portSAVE_CONTEXT();
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222 portRESTORE_CONTEXT();
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224 /*-----------------------------------------------------------*/
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226 static void prvRxHandler( void )
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229 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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231 /* The interrupt was caused by the receiver getting data. */
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232 cChar = uart1->rx_data;
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234 xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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236 /* If an event caused a task to unblock then we call "Yield from ISR" to
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237 ensure that the unblocked task is the task that executes when the interrupt
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238 completes if the unblocked task has a priority higher than the interrupted
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240 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
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242 /*-----------------------------------------------------------*/
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