2 FreeRTOS.org V5.0.4 - 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! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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51 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER for port 1.
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53 Note that this driver is written to test the RTOS port and is not intended
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54 to represent an optimised solution. */
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56 /* Processor Expert generated includes. */
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59 /* Scheduler include files. */
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60 #include "FreeRTOS.h"
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64 /* Demo application include files. */
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67 /* The queues used to communicate between the task code and the interrupt
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68 service routines. */
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69 static xQueueHandle xRxedChars;
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70 static xQueueHandle xCharsForTx;
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72 /* Interrupt identification bits. */
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73 #define serOVERRUN_INTERRUPT ( 0x08 )
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74 #define serRX_INTERRUPT ( 0x20 )
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75 #define serTX_INTERRUPT ( 0x80 )
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77 /*-----------------------------------------------------------*/
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81 * Initialise port for interrupt driven communications.
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83 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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85 /* Hardware setup is performed by the Processor Expert generated code.
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86 This function just creates the queues used to communicate between the
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87 interrupt code and the task code - then sets the required baud rate. */
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89 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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90 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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92 COM0_SetBaudRateMode( ( portCHAR ) ulWantedBaud );
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96 /*-----------------------------------------------------------*/
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98 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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100 /* Get the next character from the buffer queue. Return false if no characters
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101 are available, or arrive before xBlockTime expires. */
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102 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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111 /*-----------------------------------------------------------*/
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113 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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115 /* Place the character in the queue of characters to be transmitted. */
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116 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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121 /* Turn on the Tx interrupt so the ISR will remove the character from the
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122 queue and send it. This does not need to be in a critical section as
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123 if the interrupt has already removed the character the next interrupt
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124 will simply turn off the Tx interrupt again. */
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125 SCI0CR2_SCTIE = 1;;
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129 /*-----------------------------------------------------------*/
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131 void vSerialClose( xComPortHandle xPort )
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133 /* Not supported. */
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136 /*-----------------------------------------------------------*/
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140 * Interrupt service routine for the serial port. Must be in non-banked
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144 #pragma CODE_SEG __NEAR_SEG NON_BANKED
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146 __interrupt void vCOM0_ISR( void )
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148 volatile unsigned portCHAR ucByte, ucStatus;
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149 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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151 /* What caused the interrupt? */
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152 ucStatus = SCI0SR1;
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154 if( ucStatus & serOVERRUN_INTERRUPT )
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156 /* The interrupt was caused by an overrun. Clear the error by reading
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157 the data register. */
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161 if( ucStatus & serRX_INTERRUPT )
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163 /* The interrupt was caused by a character being received.
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164 Read the received byte. */
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167 /* Post the character onto the queue of received characters - noting
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168 whether or not this wakes a task. */
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169 xQueueSendFromISR( xRxedChars, ( void * ) &ucByte, &xHigherPriorityTaskWoken );
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172 if( ( ucStatus & serTX_INTERRUPT ) && ( SCI0CR2_SCTIE ) )
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174 /* The interrupt was caused by a character being transmitted. */
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175 if( xQueueReceiveFromISR( xCharsForTx, ( void * ) &ucByte, &xHigherPriorityTaskWoken ) == pdTRUE )
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177 /* Clear the SCRF bit. */
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182 /* Disable transmit interrupt */
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183 SCI0CR2_SCTIE = 0;
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187 if( xHigherPriorityTaskWoken )
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193 #pragma CODE_SEG DEFAULT
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