2 FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS 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 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; 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, 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 See http://www.FreeRTOS.org for documentation, latest information, license
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28 and contact details. Please ensure to read the configuration and relevant
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29 port sections of the online documentation.
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30 ***************************************************************************
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34 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER for port 1.
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36 Note that this driver is written to test the RTOS port and is not intended
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37 to represent an optimised solution. */
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39 /* Processor Expert generated includes. */
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42 /* Scheduler include files. */
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43 #include "FreeRTOS.h"
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47 /* Demo application include files. */
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50 /* The queues used to communicate between the task code and the interrupt
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51 service routines. */
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52 static xQueueHandle xRxedChars;
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53 static xQueueHandle xCharsForTx;
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55 /* Interrupt identification bits. */
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56 #define serOVERRUN_INTERRUPT ( 0x08 )
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57 #define serRX_INTERRUPT ( 0x20 )
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58 #define serTX_INTERRUPT ( 0x80 )
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60 /*-----------------------------------------------------------*/
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64 * Initialise port for interrupt driven communications.
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66 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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68 /* Hardware setup is performed by the Processor Expert generated code.
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69 This function just creates the queues used to communicate between the
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70 interrupt code and the task code - then sets the required baud rate. */
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72 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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73 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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75 COM0_SetBaudRateMode( ( portCHAR ) ulWantedBaud );
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79 /*-----------------------------------------------------------*/
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81 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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83 /* Get the next character from the buffer queue. Return false if no characters
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84 are available, or arrive before xBlockTime expires. */
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85 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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94 /*-----------------------------------------------------------*/
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96 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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98 /* Place the character in the queue of characters to be transmitted. */
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99 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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104 /* Turn on the Tx interrupt so the ISR will remove the character from the
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105 queue and send it. This does not need to be in a critical section as
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106 if the interrupt has already removed the character the next interrupt
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107 will simply turn off the Tx interrupt again. */
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108 SCI0CR2_SCTIE = 1;;
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112 /*-----------------------------------------------------------*/
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114 void vSerialClose( xComPortHandle xPort )
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116 /* Not supported. */
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119 /*-----------------------------------------------------------*/
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123 * Interrupt service routine for the serial port. Must be in non-banked
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127 #pragma CODE_SEG __NEAR_SEG NON_BANKED
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129 __interrupt void vCOM0_ISR( void )
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131 volatile unsigned portCHAR ucByte, ucStatus;
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132 portBASE_TYPE xTaskWokenByPost = pdFALSE, xTaskWokenByTx = pdFALSE;
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134 /* What caused the interrupt? */
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135 ucStatus = SCI0SR1;
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137 if( ucStatus & serOVERRUN_INTERRUPT )
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139 /* The interrupt was caused by an overrun. Clear the error by reading
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140 the data register. */
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144 if( ucStatus & serRX_INTERRUPT )
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146 /* The interrupt was caused by a character being received.
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147 Read the received byte. */
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150 /* Post the character onto the queue of received characters - noting
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151 whether or not this wakes a task. */
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152 xTaskWokenByPost = xQueueSendFromISR( xRxedChars, ( void * ) &ucByte, pdFALSE );
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155 if( ( ucStatus & serTX_INTERRUPT ) && ( SCI0CR2_SCTIE ) )
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157 /* The interrupt was caused by a character being transmitted. */
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158 if( xQueueReceiveFromISR( xCharsForTx, ( void * ) &ucByte, &xTaskWokenByTx ) == pdTRUE )
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160 /* Clear the SCRF bit. */
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165 /* Disable transmit interrupt */
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166 SCI0CR2_SCTIE = 0;
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170 if( ( xTaskWokenByPost ) || ( xTaskWokenByTx ) )
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176 #pragma CODE_SEG DEFAULT
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