2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License (version 2) as published by the
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8 Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS without being obliged to provide the
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11 source code for proprietary components outside of the FreeRTOS kernel.
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12 Alternative commercial license and support terms are also available upon
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13 request. See the licensing section of http://www.FreeRTOS.org for full
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16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 You should have received a copy of the GNU General Public License along
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22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ***************************************************************************
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28 * The FreeRTOS eBook and reference manual are available to purchase for a *
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29 * small fee. Help yourself get started quickly while also helping the *
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30 * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
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32 ***************************************************************************
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36 Please ensure to read the configuration and relevant port sections of the
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37 online documentation.
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39 http://www.FreeRTOS.org - Documentation, latest information, license and
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42 http://www.SafeRTOS.com - A version that is certified for use in safety
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45 http://www.OpenRTOS.com - Commercial support, development, porting,
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46 licensing and training services.
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50 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART1.
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53 /* Library includes. */
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54 #include "91x_lib.h"
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56 /* Scheduler includes. */
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57 #include "FreeRTOS.h"
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61 /* Demo application includes. */
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63 /*-----------------------------------------------------------*/
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66 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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67 #define serNO_BLOCK ( ( portTickType ) 0 )
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68 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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70 /* Interrupt and status bit definitions. */
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71 #define mainTXRIS 0x20
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72 #define mainRXRIS 0x50
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73 #define serTX_FIFO_FULL 0x20
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74 #define serCLEAR_ALL_INTERRUPTS 0x3ff
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75 /*-----------------------------------------------------------*/
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77 /* The queue used to hold received characters. */
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78 static xQueueHandle xRxedChars;
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80 /* The semaphore used to wake a task waiting for space to become available
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82 static xSemaphoreHandle xTxFIFOSemaphore;
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84 /*-----------------------------------------------------------*/
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86 /* UART interrupt handler. */
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87 void UART1_IRQHandler( void );
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89 /* The interrupt service routine - called from the assembly entry point. */
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90 __arm void UART1_IRQHandler( void );
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92 /*-----------------------------------------------------------*/
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94 /* Flag to indicate whether or not a task is blocked waiting for space on
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96 static long lTaskWaiting = pdFALSE;
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99 * See the serial2.h header file.
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101 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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103 xComPortHandle xReturn;
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104 UART_InitTypeDef xUART1_Init;
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105 GPIO_InitTypeDef GPIO_InitStructure;
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107 /* Create the queues used to hold Rx characters. */
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108 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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110 /* Create the semaphore used to wake a task waiting for space to become
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111 available in the FIFO. */
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112 vSemaphoreCreateBinary( xTxFIFOSemaphore );
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114 /* If the queue/semaphore was created correctly then setup the serial port
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116 if( ( xRxedChars != serINVALID_QUEUE ) && ( xTxFIFOSemaphore != serINVALID_QUEUE ) )
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118 /* Pre take the semaphore so a task will block if it tries to access
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120 xSemaphoreTake( xTxFIFOSemaphore, 0 );
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122 /* Configure the UART. */
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123 xUART1_Init.UART_WordLength = UART_WordLength_8D;
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124 xUART1_Init.UART_StopBits = UART_StopBits_1;
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125 xUART1_Init.UART_Parity = UART_Parity_No;
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126 xUART1_Init.UART_BaudRate = ulWantedBaud;
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127 xUART1_Init.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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128 xUART1_Init.UART_Mode = UART_Mode_Tx_Rx;
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129 xUART1_Init.UART_FIFO = UART_FIFO_Enable;
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131 /* Enable the UART1 Clock */
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132 SCU_APBPeriphClockConfig( __UART1, ENABLE );
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134 /* Enable the GPIO3 Clock */
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135 SCU_APBPeriphClockConfig( __GPIO3, ENABLE );
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137 /* Configure UART1_Rx pin GPIO3.2 */
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138 GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
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139 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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140 GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
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141 GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
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142 GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1 ;
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143 GPIO_Init( GPIO3, &GPIO_InitStructure );
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145 /* Configure UART1_Tx pin GPIO3.3 */
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146 GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
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147 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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148 GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
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149 GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
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150 GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2 ;
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151 GPIO_Init( GPIO3, &GPIO_InitStructure );
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154 portENTER_CRITICAL();
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156 /* Configure the UART itself. */
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157 UART_DeInit( UART1 );
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158 UART_Init( UART1, &xUART1_Init );
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159 UART_ITConfig( UART1, UART_IT_Receive | UART_IT_Transmit, ENABLE );
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160 UART1->ICR = serCLEAR_ALL_INTERRUPTS;
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161 UART_LoopBackConfig( UART1, DISABLE );
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162 UART_IrDACmd( IrDA1, DISABLE );
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164 /* Configure the VIC for the UART interrupts. */
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165 VIC_Config( UART1_ITLine, VIC_IRQ, 9 );
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166 VIC_ITCmd( UART1_ITLine, ENABLE );
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168 UART_Cmd( UART1, ENABLE );
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169 lTaskWaiting = pdFALSE;
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171 portEXIT_CRITICAL();
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175 xReturn = ( xComPortHandle ) 0;
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178 /* This demo file only supports a single port but we have to return
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179 something to comply with the standard demo header file. */
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182 /*-----------------------------------------------------------*/
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184 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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186 /* The port handle is not required as this driver only supports one port. */
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189 /* Get the next character from the buffer. Return false if no characters
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190 are available, or arrive before xBlockTime expires. */
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191 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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200 /*-----------------------------------------------------------*/
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202 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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204 signed char *pxNext;
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206 /* A couple of parameters that this port does not use. */
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207 ( void ) usStringLength;
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210 /* NOTE: This implementation does not handle the queue being full as no
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211 block time is used! */
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213 /* The port handle is not required as this driver only supports UART1. */
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216 /* Send each character in the string, one at a time. */
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217 pxNext = ( signed char * ) pcString;
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220 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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224 /*-----------------------------------------------------------*/
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226 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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228 portBASE_TYPE xReturn;
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230 portENTER_CRITICAL();
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232 /* Can we write to the FIFO? */
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233 if( UART1->FR & serTX_FIFO_FULL )
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235 /* Wait for the interrupt letting us know there is space on the
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236 FIFO. It is ok to block in a critical section, interrupts will be
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237 enabled for other tasks once we force a switch. */
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238 lTaskWaiting = pdTRUE;
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240 /* Just to be a bit different this driver uses a semaphore to
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241 block the sending task when the FIFO is full. The standard COMTest
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242 task assumes a queue of adequate length exists so does not use
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243 a block time. For this demo the block time is therefore hard
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245 xReturn = xSemaphoreTake( xTxFIFOSemaphore, serTX_BLOCK_TIME );
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248 UART1->DR = cOutChar;
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253 UART1->DR = cOutChar;
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257 portEXIT_CRITICAL();
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261 /*-----------------------------------------------------------*/
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263 void vSerialClose( xComPortHandle xPort )
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265 /* Not supported as not required by the demo application. */
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267 /*-----------------------------------------------------------*/
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269 void UART1_IRQHandler( void )
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272 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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274 while( UART1->RIS & mainRXRIS )
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276 /* The interrupt was caused by a character being received. Grab the
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277 character from the DR and place it in the queue of received
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280 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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283 if( UART1->RIS & mainTXRIS )
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285 if( lTaskWaiting == pdTRUE )
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287 /* This interrupt was caused by space becoming available on the Tx
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288 FIFO, wake any task that is waiting to post (if any). */
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289 xSemaphoreGiveFromISR( xTxFIFOSemaphore, &xHigherPriorityTaskWoken );
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290 lTaskWaiting = pdFALSE;
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293 UART1->ICR = mainTXRIS;
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296 /* If a task was woken by either a character being received or a character
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297 being transmitted then we may need to switch to another task. */
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298 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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