2 FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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97 /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER.
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99 NOTE: This driver is primarily to test the scheduler functionality. It does
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100 not effectively use the buffers or DMA and is therefore not intended to be
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101 an example of an efficient driver. */
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103 /* Standard include file. */
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104 #include <stdlib.h>
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106 /* Scheduler include files. */
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107 #include "FreeRTOS.h"
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111 /* Demo app include files. */
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112 #include "serial.h"
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114 /* Hardware setup. */
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115 #define serOUTPUT 0
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117 #define serLOW_SPEED 0
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118 #define serONE_STOP_BIT 0
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119 #define serEIGHT_DATA_BITS_NO_PARITY 0
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120 #define serNORMAL_IDLE_STATE 0
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121 #define serAUTO_BAUD_OFF 0
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122 #define serLOOPBACK_OFF 0
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123 #define serWAKE_UP_DISABLE 0
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124 #define serNO_HARDWARE_FLOW_CONTROL 0
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125 #define serSTANDARD_IO 0
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126 #define serNO_IRDA 0
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127 #define serCONTINUE_IN_IDLE_MODE 0
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128 #define serUART_ENABLED 1
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129 #define serINTERRUPT_ON_SINGLE_CHAR 0
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130 #define serTX_ENABLE 1
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131 #define serINTERRUPT_ENABLE 1
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132 #define serINTERRUPT_DISABLE 0
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133 #define serCLEAR_FLAG 0
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134 #define serSET_FLAG 1
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137 /* The queues used to communicate between tasks and ISR's. */
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138 static QueueHandle_t xRxedChars;
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139 static QueueHandle_t xCharsForTx;
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141 static portBASE_TYPE xTxHasEnded;
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142 /*-----------------------------------------------------------*/
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144 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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148 /* Create the queues used by the com test task. */
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149 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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150 xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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152 /* Setup the UART. */
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153 U2MODEbits.BRGH = serLOW_SPEED;
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154 U2MODEbits.STSEL = serONE_STOP_BIT;
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155 U2MODEbits.PDSEL = serEIGHT_DATA_BITS_NO_PARITY;
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156 U2MODEbits.ABAUD = serAUTO_BAUD_OFF;
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157 U2MODEbits.LPBACK = serLOOPBACK_OFF;
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158 U2MODEbits.WAKE = serWAKE_UP_DISABLE;
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159 U2MODEbits.UEN = serNO_HARDWARE_FLOW_CONTROL;
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160 U2MODEbits.IREN = serNO_IRDA;
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161 U2MODEbits.USIDL = serCONTINUE_IN_IDLE_MODE;
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162 U2MODEbits.UARTEN = serUART_ENABLED;
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164 U2BRG = (unsigned short)(( (float)configCPU_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5);
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166 U2STAbits.URXISEL = serINTERRUPT_ON_SINGLE_CHAR;
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167 U2STAbits.UTXEN = serTX_ENABLE;
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168 U2STAbits.UTXINV = serNORMAL_IDLE_STATE;
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169 U2STAbits.UTXISEL0 = serINTERRUPT_ON_SINGLE_CHAR;
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170 U2STAbits.UTXISEL1 = serINTERRUPT_ON_SINGLE_CHAR;
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172 /* It is assumed that this function is called prior to the scheduler being
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173 started. Therefore interrupts must not be allowed to occur yet as they
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174 may attempt to perform a context switch. */
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175 portDISABLE_INTERRUPTS();
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177 IFS1bits.U2RXIF = serCLEAR_FLAG;
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178 IFS1bits.U2TXIF = serCLEAR_FLAG;
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179 IPC7bits.U2RXIP = configKERNEL_INTERRUPT_PRIORITY;
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180 IPC7bits.U2TXIP = configKERNEL_INTERRUPT_PRIORITY;
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181 IEC1bits.U2TXIE = serINTERRUPT_ENABLE;
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182 IEC1bits.U2RXIE = serINTERRUPT_ENABLE;
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184 /* Clear the Rx buffer. */
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185 while( U2STAbits.URXDA == serSET_FLAG )
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190 xTxHasEnded = pdTRUE;
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194 /*-----------------------------------------------------------*/
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196 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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198 /* Only one port is supported. */
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201 /* Get the next character from the buffer. Return false if no characters
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202 are available or arrive before xBlockTime expires. */
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203 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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212 /*-----------------------------------------------------------*/
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214 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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216 /* Only one port is supported. */
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219 /* Return false if after the block time there is no room on the Tx queue. */
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220 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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225 /* A critical section should not be required as xTxHasEnded will not be
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226 written to by the ISR if it is already 0 (is this correct?). */
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229 xTxHasEnded = pdFALSE;
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230 IFS1bits.U2TXIF = serSET_FLAG;
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235 /*-----------------------------------------------------------*/
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237 void vSerialClose( xComPortHandle xPort )
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240 /*-----------------------------------------------------------*/
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242 void __attribute__((__interrupt__, auto_psv)) _U2RXInterrupt( void )
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245 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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247 /* Get the character and post it on the queue of Rxed characters.
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248 If the post causes a task to wake force a context switch as the woken task
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249 may have a higher priority than the task we have interrupted. */
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250 IFS1bits.U2RXIF = serCLEAR_FLAG;
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251 while( U2STAbits.URXDA )
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254 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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257 if( xHigherPriorityTaskWoken != pdFALSE )
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262 /*-----------------------------------------------------------*/
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264 void __attribute__((__interrupt__, auto_psv)) _U2TXInterrupt( void )
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267 portBASE_TYPE xTaskWoken = pdFALSE;
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269 /* If the transmit buffer is full we cannot get the next character.
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270 Another interrupt will occur the next time there is space so this does
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272 IFS1bits.U2TXIF = serCLEAR_FLAG;
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273 while( !( U2STAbits.UTXBF ) )
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275 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWoken ) == pdTRUE )
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277 /* Send the next character queued for Tx. */
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282 /* Queue empty, nothing to send. */
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283 xTxHasEnded = pdTRUE;
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288 if( xTaskWoken != pdFALSE )
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