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 * This file only supports UART 1
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102 /* Standard includes. */
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103 #include <stdlib.h>
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104 #include <signal.h>
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106 /* Scheduler includes. */
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107 #include "FreeRTOS.h"
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111 /* Demo application includes. */
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112 #include "serial.h"
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114 /* Constants required to setup the hardware. */
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115 #define serTX_AND_RX ( ( unsigned char ) 0x03 )
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117 /* Misc. constants. */
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118 #define serNO_BLOCK ( ( TickType_t ) 0 )
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120 /* Enable the UART Tx interrupt. */
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121 #define vInterruptOn() IFG2 |= UTXIFG1
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123 /* The queue used to hold received characters. */
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124 static QueueHandle_t xRxedChars;
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126 /* The queue used to hold characters waiting transmission. */
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127 static QueueHandle_t xCharsForTx;
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129 static volatile short sTHREEmpty;
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131 /* Interrupt service routines. */
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132 interrupt (UART1RX_VECTOR) wakeup vRxISR( void );
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133 interrupt (UART1TX_VECTOR) wakeup vTxISR( void );
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135 /*-----------------------------------------------------------*/
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137 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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139 unsigned long ulBaudRateCount;
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141 /* Initialise the hardware. */
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143 /* Generate the baud rate constants for the wanted baud rate. */
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144 ulBaudRateCount = configCPU_CLOCK_HZ / ulWantedBaud;
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146 portENTER_CRITICAL();
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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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155 /* Set pin function. */
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156 P4SEL |= serTX_AND_RX;
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158 /* All other bits remain at zero for n, 8, 1 interrupt driven operation.
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160 U1CTL |= CHAR + LISTEN;
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163 /* Setup baud rate low byte. */
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164 U1BR0 = ( unsigned char ) ( ulBaudRateCount & ( unsigned long ) 0xff );
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166 /* Setup baud rate high byte. */
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167 ulBaudRateCount >>= 8UL;
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168 U1BR1 = ( unsigned char ) ( ulBaudRateCount & ( unsigned long ) 0xff );
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170 /* Enable ports. */
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171 ME2 |= UTXE1 + URXE1;
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176 /* Nothing in the buffer yet. */
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177 sTHREEmpty = pdTRUE;
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179 /* Enable interrupts. */
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180 IE2 |= URXIE1 + UTXIE1;
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182 portEXIT_CRITICAL();
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184 /* Unlike other ports, this serial code does not allow for more than one
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185 com port. We therefore don't return a pointer to a port structure and can
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186 instead just return NULL. */
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189 /*-----------------------------------------------------------*/
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191 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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193 /* Get the next character from the buffer. Return false if no characters
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194 are available, or arrive before xBlockTime expires. */
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195 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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204 /*-----------------------------------------------------------*/
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206 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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208 signed portBASE_TYPE xReturn;
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210 /* Transmit a character. */
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212 portENTER_CRITICAL();
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214 if( sTHREEmpty == pdTRUE )
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216 /* If sTHREEmpty is true then the UART Tx ISR has indicated that
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217 there are no characters queued to be transmitted - so we can
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218 write the character directly to the shift Tx register. */
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219 sTHREEmpty = pdFALSE;
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220 U1TXBUF = cOutChar;
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225 /* sTHREEmpty is false, so there are still characters waiting to be
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226 transmitted. We have to queue this character so it gets
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227 transmitted in turn. */
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229 /* Return false if after the block time there is no room on the Tx
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230 queue. It is ok to block inside a critical section as each task
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231 maintains it's own critical section status. */
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232 xReturn = xQueueSend( xCharsForTx, &cOutChar, xBlockTime );
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234 /* Depending on queue sizing and task prioritisation: While we
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235 were blocked waiting to post on the queue interrupts were not
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236 disabled. It is possible that the serial ISR has emptied the
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237 Tx queue, in which case we need to start the Tx off again
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238 writing directly to the Tx register. */
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239 if( ( sTHREEmpty == pdTRUE ) && ( xReturn == pdPASS ) )
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241 /* Get back the character we just posted. */
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242 xQueueReceive( xCharsForTx, &cOutChar, serNO_BLOCK );
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243 sTHREEmpty = pdFALSE;
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244 U1TXBUF = cOutChar;
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248 portEXIT_CRITICAL();
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252 /*-----------------------------------------------------------*/
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255 * UART RX interrupt service routine.
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257 interrupt (UART1RX_VECTOR) wakeup vRxISR( void )
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260 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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262 /* Get the character from the UART and post it on the queue of Rxed
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266 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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268 if( xHigherPriorityTaskWoken )
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270 /*If the post causes a task to wake force a context switch
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271 as the woken task may have a higher priority than the task we have
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276 /*-----------------------------------------------------------*/
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279 * UART Tx interrupt service routine.
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281 interrupt (UART1TX_VECTOR) wakeup vTxISR( void )
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284 portBASE_TYPE xTaskWoken = pdFALSE;
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286 /* The previous character has been transmitted. See if there are any
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287 further characters waiting transmission. */
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289 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWoken ) == pdTRUE )
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291 /* There was another character queued - transmit it now. */
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296 /* There were no other characters to transmit. */
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297 sTHREEmpty = pdTRUE;
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