2 FreeRTOS V8.1.2 - 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 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 /* Basic interrupt driven serial port driver for uart1.
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69 /* Standard includes. */
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72 /* Kernel includes. */
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73 #include "FreeRTOS.h"
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77 /* Demo application includes. */
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78 #include <machine/uart.h>
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79 #include <machine/ic.h>
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81 /*-----------------------------------------------------------*/
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83 #define comBLOCK_RETRY_TIME 10
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84 /*-----------------------------------------------------------*/
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86 /* The interrupt handlers are naked functions that call C handlers. The C
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87 handlers are marked as noinline to ensure they work correctly when the
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89 void interrupt5_handler( void ) __attribute__((naked));
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90 static void prvTxHandler( void ) __attribute__((noinline));
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91 void interrupt6_handler( void ) __attribute__((naked));
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92 static void prvRxHandler( void ) __attribute__((noinline));
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94 /*-----------------------------------------------------------*/
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96 /* Queues used to hold received characters, and characters waiting to be
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98 static QueueHandle_t xRxedChars;
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99 static QueueHandle_t xCharsForTx;
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100 /*-----------------------------------------------------------*/
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102 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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104 /* Create the queues used to hold Rx and Tx characters. */
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105 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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106 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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108 if( ( xRxedChars ) && ( xCharsForTx ) )
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110 /* Set up interrupts */
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111 /* tx interrupt will be enabled when we need to send something */
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112 uart1->tx_mask = 0;
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113 uart1->rx_mask = 1;
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114 irq[IRQ_UART1_TX].ien = 1;
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115 irq[IRQ_UART1_RX].ien = 1;
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118 return ( xComPortHandle ) 0;
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120 /*-----------------------------------------------------------*/
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122 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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124 /* The port handle is not required as this driver only supports uart1. */
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127 /* Get the next character from the buffer. Return false if no characters
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128 are available, or arrive before xBlockTime expires. */
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129 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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138 /*-----------------------------------------------------------*/
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140 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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143 signed char *pChNext;
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145 /* Send each character in the string, one at a time. */
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146 pChNext = ( signed char * )pcString;
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147 for( i = 0; i < usStringLength; i++ )
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149 /* Block until character has been transmitted. */
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150 while( xSerialPutChar( pxPort, *pChNext, comBLOCK_RETRY_TIME ) != pdTRUE ); pChNext++;
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153 /*-----------------------------------------------------------*/
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155 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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159 /* Place the character in the queue of characters to be transmitted. */
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160 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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165 /* Turn on the Tx interrupt so the ISR will remove the character from the
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166 queue and send it. This does not need to be in a critical section as
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167 if the interrupt has already removed the character the next interrupt
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168 will simply turn off the Tx interrupt again. */
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169 uart1->tx_mask = 1;
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173 /*-----------------------------------------------------------*/
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175 void vSerialClose( xComPortHandle xPort )
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177 /* Not supported as not required by the demo application. */
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180 /*-----------------------------------------------------------*/
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182 /* UART Tx interrupt handler. */
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183 void interrupt5_handler( void )
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185 /* This is a naked function. */
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186 portSAVE_CONTEXT();
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188 portRESTORE_CONTEXT();
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190 /*-----------------------------------------------------------*/
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192 static void prvTxHandler( void )
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195 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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197 /* The interrupt was caused by the transmit fifo having space for at least one
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198 character. Are there any more characters to transmit? */
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199 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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201 /* A character was retrieved from the queue so can be sent to the uart now. */
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202 uart1->tx_data = cChar;
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206 /* Queue empty, nothing to send so turn off the Tx interrupt. */
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207 uart1->tx_mask = 0;
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210 /* If an event caused a task to unblock then we call "Yield from ISR" to
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211 ensure that the unblocked task is the task that executes when the interrupt
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212 completes if the unblocked task has a priority higher than the interrupted
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214 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
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216 /*-----------------------------------------------------------*/
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218 /* UART Rx interrupt. */
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219 void interrupt6_handler( void )
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221 portSAVE_CONTEXT();
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223 portRESTORE_CONTEXT();
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225 /*-----------------------------------------------------------*/
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227 static void prvRxHandler( void )
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230 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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232 /* The interrupt was caused by the receiver getting data. */
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233 cChar = uart1->rx_data;
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235 xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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237 /* If an event caused a task to unblock then we call "Yield from ISR" to
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238 ensure that the unblocked task is the task that executes when the interrupt
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239 completes if the unblocked task has a priority higher than the interrupted
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241 portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
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243 /*-----------------------------------------------------------*/
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