2 FreeRTOS.org V4.8.0 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! Why not get us to quote to get FreeRTOS.org *
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30 * running on your hardware - or even write all or part of your application*
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31 * for you? See http://www.OpenRTOS.com for details. *
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33 ***************************************************************************
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34 ***************************************************************************
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36 Please ensure to read the configuration and relevant port sections of the
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37 online documentation.
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39 http://www.FreeRTOS.org - Documentation, latest information, license and
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42 http://www.SafeRTOS.com - A version that is certified for use in safety
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45 http://www.OpenRTOS.com - Commercial support, development, porting,
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46 licensing and training services.
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50 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER for port 1.
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52 Note that this driver is written to test the RTOS port and is not intended
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53 to represent an optimised solution. */
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55 /* Processor Expert generated includes. */
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58 /* Scheduler include files. */
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59 #include "FreeRTOS.h"
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63 /* Demo application include files. */
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66 /* The queues used to communicate between the task code and the interrupt
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67 service routines. */
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68 static xQueueHandle xRxedChars;
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69 static xQueueHandle xCharsForTx;
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71 /* Interrupt identification bits. */
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72 #define serOVERRUN_INTERRUPT ( 0x08 )
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73 #define serRX_INTERRUPT ( 0x20 )
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74 #define serTX_INTERRUPT ( 0x80 )
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76 /*-----------------------------------------------------------*/
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80 * Initialise port for interrupt driven communications.
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82 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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84 /* Hardware setup is performed by the Processor Expert generated code.
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85 This function just creates the queues used to communicate between the
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86 interrupt code and the task code - then sets the required baud rate. */
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88 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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89 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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91 COM0_SetBaudRateMode( ( portCHAR ) ulWantedBaud );
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95 /*-----------------------------------------------------------*/
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97 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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99 /* Get the next character from the buffer queue. Return false if no characters
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100 are available, or arrive before xBlockTime expires. */
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101 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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110 /*-----------------------------------------------------------*/
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112 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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114 /* Place the character in the queue of characters to be transmitted. */
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115 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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120 /* Turn on the Tx interrupt so the ISR will remove the character from the
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121 queue and send it. This does not need to be in a critical section as
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122 if the interrupt has already removed the character the next interrupt
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123 will simply turn off the Tx interrupt again. */
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124 SCI0CR2_SCTIE = 1;;
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128 /*-----------------------------------------------------------*/
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130 void vSerialClose( xComPortHandle xPort )
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132 /* Not supported. */
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135 /*-----------------------------------------------------------*/
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139 * Interrupt service routine for the serial port. Must be in non-banked
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143 #pragma CODE_SEG __NEAR_SEG NON_BANKED
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145 __interrupt void vCOM0_ISR( void )
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147 volatile unsigned portCHAR ucByte, ucStatus;
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148 portBASE_TYPE xTaskWokenByPost = pdFALSE, xTaskWokenByTx = pdFALSE;
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150 /* What caused the interrupt? */
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151 ucStatus = SCI0SR1;
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153 if( ucStatus & serOVERRUN_INTERRUPT )
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155 /* The interrupt was caused by an overrun. Clear the error by reading
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156 the data register. */
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160 if( ucStatus & serRX_INTERRUPT )
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162 /* The interrupt was caused by a character being received.
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163 Read the received byte. */
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166 /* Post the character onto the queue of received characters - noting
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167 whether or not this wakes a task. */
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168 xTaskWokenByPost = xQueueSendFromISR( xRxedChars, ( void * ) &ucByte, pdFALSE );
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171 if( ( ucStatus & serTX_INTERRUPT ) && ( SCI0CR2_SCTIE ) )
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173 /* The interrupt was caused by a character being transmitted. */
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174 if( xQueueReceiveFromISR( xCharsForTx, ( void * ) &ucByte, &xTaskWokenByTx ) == pdTRUE )
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176 /* Clear the SCRF bit. */
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181 /* Disable transmit interrupt */
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182 SCI0CR2_SCTIE = 0;
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186 if( ( xTaskWokenByPost ) || ( xTaskWokenByTx ) )
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192 #pragma CODE_SEG DEFAULT
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