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 FOR UART0.
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100 /* Library includes. */
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105 /* Scheduler includes. */
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106 #include "FreeRTOS.h"
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109 /* Demo application includes. */
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110 #include "serial.h"
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112 #define UART0_Rx_Pin ( 0x0001<< 8 )
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113 #define UART0_Tx_Pin ( 0x0001<< 9 )
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115 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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116 #define serNO_BLOCK ( ( TickType_t ) 0 )
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118 /* Macros to turn on and off the Tx empty interrupt. */
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119 #define serINTERRUPT_ON() UART0->IER |= UART_TxHalfEmpty
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120 #define serINTERRUPT_OFF() UART0->IER &= ~UART_TxHalfEmpty
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122 /*-----------------------------------------------------------*/
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124 /* Queues used to hold received characters, and characters waiting to be
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126 static QueueHandle_t xRxedChars;
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127 static QueueHandle_t xCharsForTx;
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129 /*-----------------------------------------------------------*/
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131 /* Interrupt entry point written in the assembler file serialISR.s79. */
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132 extern void vSerialISREntry( void );
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134 /* The interrupt service routine - called from the assembly entry point. */
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135 __arm void vSerialISR( void );
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137 /*-----------------------------------------------------------*/
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140 * See the serial2.h header file.
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142 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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144 xComPortHandle xReturn;
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146 /* Create the queues used to hold Rx and Tx characters. */
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147 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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148 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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150 /* If the queues were created correctly then setup the serial port
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152 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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154 portENTER_CRITICAL();
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156 /* Setup the UART port pins. */
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157 GPIO_Config( GPIO0, UART0_Tx_Pin, GPIO_AF_PP );
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158 GPIO_Config( GPIO0, UART0_Rx_Pin, GPIO_IN_TRI_CMOS );
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160 /* Configure the UART. */
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161 UART_OnOffConfig( UART0, ENABLE );
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162 UART_FifoConfig( UART0, DISABLE );
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163 UART_FifoReset( UART0, UART_RxFIFO );
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164 UART_FifoReset( UART0, UART_TxFIFO );
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165 UART_LoopBackConfig(UART0, DISABLE );
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166 UART_Config( UART0, ulWantedBaud, UART_NO_PARITY, UART_1_StopBits, UARTM_8D );
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167 UART_RxConfig( UART0, ENABLE );
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169 /* Configure the IEC for the UART interrupts. */
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170 EIC_IRQChannelPriorityConfig( UART0_IRQChannel, 1 );
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171 EIC_IRQChannelConfig( UART0_IRQChannel, ENABLE );
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172 EIC_IRQConfig( ENABLE );
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173 UART_ItConfig( UART0, UART_RxBufFull, ENABLE );
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175 portEXIT_CRITICAL();
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179 xReturn = ( xComPortHandle ) 0;
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182 /* This demo file only supports a single port but we have to return
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183 something to comply with the standard demo header file. */
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186 /*-----------------------------------------------------------*/
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188 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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190 /* The port handle is not required as this driver only supports one port. */
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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 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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208 signed char *pxNext;
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210 /* A couple of parameters that this port does not use. */
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211 ( void ) usStringLength;
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214 /* NOTE: This implementation does not handle the queue being full as no
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215 block time is used! */
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217 /* The port handle is not required as this driver only supports UART0. */
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220 /* Send each character in the string, one at a time. */
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221 pxNext = ( signed char * ) pcString;
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224 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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228 /*-----------------------------------------------------------*/
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230 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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232 /* Place the character in the queue of characters to be transmitted. */
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233 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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238 /* Turn on the Tx interrupt so the ISR will remove the character from the
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239 queue and send it. This does not need to be in a critical section as
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240 if the interrupt has already removed the character the next interrupt
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241 will simply turn off the Tx interrupt again. */
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246 /*-----------------------------------------------------------*/
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248 void vSerialClose( xComPortHandle xPort )
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250 /* Not supported as not required by the demo application. */
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252 /*-----------------------------------------------------------*/
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254 /* Serial port ISR. This can cause a context switch so is not defined as a
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255 standard ISR using the __irq keyword. Instead a wrapper function is defined
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256 within serialISR.s79 which in turn calls this function. See the port
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257 documentation on the FreeRTOS.org website for more information. */
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258 __arm void vSerialISR( void )
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260 unsigned short usStatus;
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262 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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264 /* What caused the interrupt? */
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265 usStatus = UART_FlagStatus( UART0 );
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267 if( usStatus & UART_TxHalfEmpty )
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269 /* The interrupt was caused by the THR becoming empty. Are there any
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270 more characters to transmit? */
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271 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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273 /* A character was retrieved from the queue so can be sent to the
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275 UART0->TxBUFR = cChar;
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279 /* Queue empty, nothing to send so turn off the Tx interrupt. */
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280 serINTERRUPT_OFF();
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284 if( usStatus & UART_RxBufFull )
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286 /* The interrupt was caused by a character being received. Grab the
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287 character from the RHR and place it in the queue of received
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289 cChar = UART0->RxBUFR;
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290 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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293 /* If a task was woken by either a character being received or a character
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294 being transmitted then we may need to switch to another task. */
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295 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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297 /* End the interrupt in the EIC. */
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