2 FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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68 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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70 NOTE: This driver is primarily to test the scheduler functionality. It does
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71 not effectively use the buffers or DMA and is therefore not intended to be
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72 an example of an efficient driver. */
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74 /* Standard include file. */
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78 /* Scheduler include files. */
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79 #include "FreeRTOS.h"
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83 /* Demo app include files. */
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86 /* Hardware setup. */
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87 #define serSET_FLAG ( 1 )
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89 /* The queues used to communicate between tasks and ISR's. */
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90 static xQueueHandle xRxedChars;
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91 static xQueueHandle xCharsForTx;
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93 /* Flag used to indicate the tx status. */
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94 static portBASE_TYPE xTxHasEnded;
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96 /*-----------------------------------------------------------*/
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98 /* The UART interrupt handler. As this uses the FreeRTOS assembly interrupt
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99 entry point the IPL setting in the following prototype has no effect. The
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100 interrupt priority is set by the call to ConfigIntUART2() in
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101 xSerialPortInitMinimal(). */
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102 void __attribute__( (interrupt(ipl0), vector(_UART2_VECTOR))) vU2InterruptWrapper( void );
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104 /*-----------------------------------------------------------*/
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106 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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108 unsigned short usBRG;
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110 /* Create the queues used by the com test task. */
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111 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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112 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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114 /* Configure the UART and interrupts. */
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115 usBRG = (unsigned short)(( (float)configPERIPHERAL_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
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116 OpenUART2( UART_EN, UART_RX_ENABLE | UART_TX_ENABLE | UART_INT_TX | UART_INT_RX_CHAR, usBRG );
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117 ConfigIntUART2( ( configKERNEL_INTERRUPT_PRIORITY + 1 ) | UART_INT_SUB_PR0 | UART_TX_INT_EN | UART_RX_INT_EN );
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119 xTxHasEnded = pdTRUE;
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121 /* Only a single port is implemented so we don't need to return anything. */
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124 /*-----------------------------------------------------------*/
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126 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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128 /* Only one port is supported. */
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131 /* Get the next character from the buffer. Return false if no characters
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132 are available or arrive before xBlockTime expires. */
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133 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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142 /*-----------------------------------------------------------*/
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144 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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146 /* Only one port is supported. */
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149 /* Return false if after the block time there is no room on the Tx queue. */
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150 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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155 /* A critical section should not be required as xTxHasEnded will not be
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156 written to by the ISR if it is already 0 (is this correct?). */
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159 xTxHasEnded = pdFALSE;
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160 IFS1SET = _IFS1_U2TXIF_MASK;
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165 /*-----------------------------------------------------------*/
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167 void vSerialClose( xComPortHandle xPort )
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170 /*-----------------------------------------------------------*/
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172 void vU2InterruptHandler( void )
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174 /* Declared static to minimise stack use. */
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176 static portBASE_TYPE xHigherPriorityTaskWoken;
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178 xHigherPriorityTaskWoken = pdFALSE;
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180 /* Are any Rx interrupts pending? */
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181 if( IFS1bits.U2RXIF == 1)
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183 while( U2STAbits.URXDA )
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185 /* Retrieve the received character and place it in the queue of
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186 received characters. */
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188 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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190 IFS1CLR = _IFS1_U2RXIF_MASK;
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193 /* Are any Tx interrupts pending? */
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194 if( IFS1bits.U2TXIF == 1 )
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196 while( !( U2STAbits.UTXBF ) )
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198 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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200 /* Send the next character queued for Tx. */
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205 /* Queue empty, nothing to send. */
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206 xTxHasEnded = pdTRUE;
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211 IFS1CLR = _IFS1_U2TXIF_MASK;
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214 /* If sending or receiving necessitates a context switch, then switch now. */
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215 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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