2 FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 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 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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31 * This is a concise, step by step, 'hands on' guide that describes both *
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32 * general multitasking concepts and FreeRTOS specifics. It presents and *
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33 * explains numerous examples that are written using the FreeRTOS API. *
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34 * Full source code for all the examples is provided in an accompanying *
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37 ***************************************************************************
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38 ***************************************************************************
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40 Please ensure to read the configuration and relevant port sections of the
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41 online documentation.
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43 http://www.FreeRTOS.org - Documentation, latest information, license and
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46 http://www.SafeRTOS.com - A version that is certified for use in safety
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49 http://www.OpenRTOS.com - Commercial support, development, porting,
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50 licensing and training services.
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54 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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56 NOTE: This driver is primarily to test the scheduler functionality. It does
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57 not effectively use the buffers or DMA and is therefore not intended to be
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58 an example of an efficient driver. */
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60 /* Standard include file. */
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63 /* Scheduler include files. */
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64 #include "FreeRTOS.h"
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68 /* Demo app include files. */
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71 /* Hardware setup. */
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74 #define serLOW_SPEED 0
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75 #define serONE_STOP_BIT 0
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76 #define serEIGHT_DATA_BITS_NO_PARITY 0
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77 #define serNORMAL_IDLE_STATE 0
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78 #define serAUTO_BAUD_OFF 0
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79 #define serLOOPBACK_OFF 0
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80 #define serWAKE_UP_DISABLE 0
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81 #define serNO_HARDWARE_FLOW_CONTROL 0
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82 #define serSTANDARD_IO 0
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83 #define serNO_IRDA 0
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84 #define serCONTINUE_IN_IDLE_MODE 0
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85 #define serUART_ENABLED 1
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86 #define serINTERRUPT_ON_SINGLE_CHAR 0
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87 #define serTX_ENABLE 1
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88 #define serINTERRUPT_ENABLE 1
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89 #define serINTERRUPT_DISABLE 0
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90 #define serCLEAR_FLAG 0
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91 #define serSET_FLAG 1
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94 /* The queues used to communicate between tasks and ISR's. */
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95 static xQueueHandle xRxedChars;
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96 static xQueueHandle xCharsForTx;
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98 static portBASE_TYPE xTxHasEnded;
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99 /*-----------------------------------------------------------*/
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101 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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105 /* Create the queues used by the com test task. */
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106 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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107 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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109 /* Setup the UART. */
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110 U2MODEbits.BRGH = serLOW_SPEED;
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111 U2MODEbits.STSEL = serONE_STOP_BIT;
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112 U2MODEbits.PDSEL = serEIGHT_DATA_BITS_NO_PARITY;
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113 U2MODEbits.ABAUD = serAUTO_BAUD_OFF;
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114 U2MODEbits.LPBACK = serLOOPBACK_OFF;
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115 U2MODEbits.WAKE = serWAKE_UP_DISABLE;
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116 U2MODEbits.UEN = serNO_HARDWARE_FLOW_CONTROL;
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117 U2MODEbits.IREN = serNO_IRDA;
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118 U2MODEbits.USIDL = serCONTINUE_IN_IDLE_MODE;
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119 U2MODEbits.UARTEN = serUART_ENABLED;
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121 U2BRG = (unsigned portSHORT)(( (float)configCPU_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
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123 U2STAbits.URXISEL = serINTERRUPT_ON_SINGLE_CHAR;
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124 U2STAbits.UTXEN = serTX_ENABLE;
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125 U2STAbits.UTXINV = serNORMAL_IDLE_STATE;
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126 U2STAbits.UTXISEL0 = serINTERRUPT_ON_SINGLE_CHAR;
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127 U2STAbits.UTXISEL1 = serINTERRUPT_ON_SINGLE_CHAR;
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129 /* It is assumed that this function is called prior to the scheduler being
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130 started. Therefore interrupts must not be allowed to occur yet as they
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131 may attempt to perform a context switch. */
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132 portDISABLE_INTERRUPTS();
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134 IFS1bits.U2RXIF = serCLEAR_FLAG;
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135 IFS1bits.U2TXIF = serCLEAR_FLAG;
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136 IPC7bits.U2RXIP = configKERNEL_INTERRUPT_PRIORITY;
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137 IPC7bits.U2TXIP = configKERNEL_INTERRUPT_PRIORITY;
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138 IEC1bits.U2TXIE = serINTERRUPT_ENABLE;
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139 IEC1bits.U2RXIE = serINTERRUPT_ENABLE;
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141 /* Clear the Rx buffer. */
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142 while( U2STAbits.URXDA == serSET_FLAG )
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147 xTxHasEnded = pdTRUE;
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151 /*-----------------------------------------------------------*/
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153 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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155 /* Only one port is supported. */
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158 /* Get the next character from the buffer. Return false if no characters
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159 are available or arrive before xBlockTime expires. */
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160 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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169 /*-----------------------------------------------------------*/
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171 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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173 /* Only one port is supported. */
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176 /* Return false if after the block time there is no room on the Tx queue. */
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177 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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182 /* A critical section should not be required as xTxHasEnded will not be
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183 written to by the ISR if it is already 0 (is this correct?). */
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186 xTxHasEnded = pdFALSE;
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187 IFS1bits.U2TXIF = serSET_FLAG;
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192 /*-----------------------------------------------------------*/
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194 void vSerialClose( xComPortHandle xPort )
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197 /*-----------------------------------------------------------*/
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199 void __attribute__((__interrupt__, auto_psv)) _U2RXInterrupt( void )
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202 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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204 /* Get the character and post it on the queue of Rxed characters.
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205 If the post causes a task to wake force a context switch as the woken task
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206 may have a higher priority than the task we have interrupted. */
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207 IFS1bits.U2RXIF = serCLEAR_FLAG;
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208 while( U2STAbits.URXDA )
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211 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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214 if( xHigherPriorityTaskWoken != pdFALSE )
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219 /*-----------------------------------------------------------*/
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221 void __attribute__((__interrupt__, auto_psv)) _U2TXInterrupt( void )
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223 signed portCHAR cChar;
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224 portBASE_TYPE xTaskWoken = pdFALSE;
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226 /* If the transmit buffer is full we cannot get the next character.
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227 Another interrupt will occur the next time there is space so this does
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229 IFS1bits.U2TXIF = serCLEAR_FLAG;
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230 while( !( U2STAbits.UTXBF ) )
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232 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWoken ) == pdTRUE )
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234 /* Send the next character queued for Tx. */
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239 /* Queue empty, nothing to send. */
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240 xTxHasEnded = pdTRUE;
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245 if( xTaskWoken != pdFALSE )
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