2 FreeRTOS.org V5.3.0 - 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 it
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7 under the terms of the GNU General Public License (version 2) as published
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8 by the 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.org without being obliged to provide
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11 the source code for any proprietary components. Alternative commercial
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12 license and support terms are also available upon request. See the
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13 licensing section of http://www.FreeRTOS.org for full details.
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15 FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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20 You should have received a copy of the GNU General Public License along
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21 with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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22 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ***************************************************************************
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27 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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29 * This is a concise, step by step, 'hands on' guide that describes both *
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30 * general multitasking concepts and FreeRTOS specifics. It presents and *
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31 * explains numerous examples that are written using the FreeRTOS API. *
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32 * Full source code for all the examples is provided in an accompanying *
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35 ***************************************************************************
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39 Please ensure to read the configuration and relevant port sections of the
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40 online documentation.
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42 http://www.FreeRTOS.org - Documentation, latest information, license and
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45 http://www.SafeRTOS.com - A version that is certified for use in safety
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48 http://www.OpenRTOS.com - Commercial support, development, porting,
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49 licensing and training services.
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53 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART1.
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56 /* Library includes. */
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57 #include "91x_lib.h"
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59 /* Scheduler includes. */
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60 #include "FreeRTOS.h"
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64 /* Demo application includes. */
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66 /*-----------------------------------------------------------*/
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69 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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70 #define serNO_BLOCK ( ( portTickType ) 0 )
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71 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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73 /* Interrupt and status bit definitions. */
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74 #define mainTXRIS 0x20
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75 #define mainRXRIS 0x50
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76 #define serTX_FIFO_FULL 0x20
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77 #define serCLEAR_ALL_INTERRUPTS 0x3ff
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78 /*-----------------------------------------------------------*/
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80 /* The queue used to hold received characters. */
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81 static xQueueHandle xRxedChars;
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83 /* The semaphore used to wake a task waiting for space to become available
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85 static xSemaphoreHandle xTxFIFOSemaphore;
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87 /*-----------------------------------------------------------*/
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89 /* UART interrupt handler. */
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90 void UART1_IRQHandler( void );
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92 /* The interrupt service routine - called from the assembly entry point. */
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93 __arm void UART1_IRQHandler( void );
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95 /*-----------------------------------------------------------*/
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97 /* Flag to indicate whether or not a task is blocked waiting for space on
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99 static portLONG lTaskWaiting = pdFALSE;
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102 * See the serial2.h header file.
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104 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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106 xComPortHandle xReturn;
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107 UART_InitTypeDef xUART1_Init;
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108 GPIO_InitTypeDef GPIO_InitStructure;
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110 /* Create the queues used to hold Rx characters. */
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111 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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113 /* Create the semaphore used to wake a task waiting for space to become
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114 available in the FIFO. */
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115 vSemaphoreCreateBinary( xTxFIFOSemaphore );
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117 /* If the queue/semaphore was created correctly then setup the serial port
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119 if( ( xRxedChars != serINVALID_QUEUE ) && ( xTxFIFOSemaphore != serINVALID_QUEUE ) )
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121 /* Pre take the semaphore so a task will block if it tries to access
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123 xSemaphoreTake( xTxFIFOSemaphore, 0 );
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125 /* Configure the UART. */
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126 xUART1_Init.UART_WordLength = UART_WordLength_8D;
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127 xUART1_Init.UART_StopBits = UART_StopBits_1;
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128 xUART1_Init.UART_Parity = UART_Parity_No;
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129 xUART1_Init.UART_BaudRate = ulWantedBaud;
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130 xUART1_Init.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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131 xUART1_Init.UART_Mode = UART_Mode_Tx_Rx;
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132 xUART1_Init.UART_FIFO = UART_FIFO_Enable;
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134 /* Enable the UART1 Clock */
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135 SCU_APBPeriphClockConfig( __UART1, ENABLE );
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137 /* Enable the GPIO3 Clock */
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138 SCU_APBPeriphClockConfig( __GPIO3, ENABLE );
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140 /* Configure UART1_Rx pin GPIO3.2 */
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141 GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
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142 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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143 GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
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144 GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
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145 GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1 ;
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146 GPIO_Init( GPIO3, &GPIO_InitStructure );
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148 /* Configure UART1_Tx pin GPIO3.3 */
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149 GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
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150 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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151 GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
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152 GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
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153 GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2 ;
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154 GPIO_Init( GPIO3, &GPIO_InitStructure );
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157 portENTER_CRITICAL();
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159 /* Configure the UART itself. */
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160 UART_DeInit( UART1 );
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161 UART_Init( UART1, &xUART1_Init );
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162 UART_ITConfig( UART1, UART_IT_Receive | UART_IT_Transmit, ENABLE );
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163 UART1->ICR = serCLEAR_ALL_INTERRUPTS;
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164 UART_LoopBackConfig( UART1, DISABLE );
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165 UART_IrDACmd( IrDA1, DISABLE );
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167 /* Configure the VIC for the UART interrupts. */
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168 VIC_Config( UART1_ITLine, VIC_IRQ, 9 );
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169 VIC_ITCmd( UART1_ITLine, ENABLE );
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171 UART_Cmd( UART1, ENABLE );
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172 lTaskWaiting = pdFALSE;
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174 portEXIT_CRITICAL();
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178 xReturn = ( xComPortHandle ) 0;
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181 /* This demo file only supports a single port but we have to return
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182 something to comply with the standard demo header file. */
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185 /*-----------------------------------------------------------*/
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187 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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189 /* The port handle is not required as this driver only supports one port. */
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192 /* Get the next character from the buffer. Return false if no characters
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193 are available, or arrive before xBlockTime expires. */
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194 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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203 /*-----------------------------------------------------------*/
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205 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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207 signed portCHAR *pxNext;
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209 /* A couple of parameters that this port does not use. */
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210 ( void ) usStringLength;
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213 /* NOTE: This implementation does not handle the queue being full as no
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214 block time is used! */
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216 /* The port handle is not required as this driver only supports UART1. */
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219 /* Send each character in the string, one at a time. */
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220 pxNext = ( signed portCHAR * ) pcString;
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223 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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227 /*-----------------------------------------------------------*/
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229 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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231 portBASE_TYPE xReturn;
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233 portENTER_CRITICAL();
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235 /* Can we write to the FIFO? */
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236 if( UART1->FR & serTX_FIFO_FULL )
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238 /* Wait for the interrupt letting us know there is space on the
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239 FIFO. It is ok to block in a critical section, interrupts will be
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240 enabled for other tasks once we force a switch. */
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241 lTaskWaiting = pdTRUE;
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243 /* Just to be a bit different this driver uses a semaphore to
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244 block the sending task when the FIFO is full. The standard COMTest
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245 task assumes a queue of adequate length exists so does not use
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246 a block time. For this demo the block time is therefore hard
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248 xReturn = xSemaphoreTake( xTxFIFOSemaphore, serTX_BLOCK_TIME );
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251 UART1->DR = cOutChar;
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256 UART1->DR = cOutChar;
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260 portEXIT_CRITICAL();
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264 /*-----------------------------------------------------------*/
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266 void vSerialClose( xComPortHandle xPort )
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268 /* Not supported as not required by the demo application. */
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270 /*-----------------------------------------------------------*/
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272 void UART1_IRQHandler( void )
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274 signed portCHAR cChar;
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275 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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277 while( UART1->RIS & mainRXRIS )
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279 /* The interrupt was caused by a character being received. Grab the
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280 character from the DR and place it in the queue of received
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283 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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286 if( UART1->RIS & mainTXRIS )
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288 if( lTaskWaiting == pdTRUE )
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290 /* This interrupt was caused by space becoming available on the Tx
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291 FIFO, wake any task that is waiting to post (if any). */
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292 xSemaphoreGiveFromISR( xTxFIFOSemaphore, &xHigherPriorityTaskWoken );
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293 lTaskWaiting = pdFALSE;
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296 UART1->ICR = mainTXRIS;
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299 /* If a task was woken by either a character being received or a character
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300 being transmitted then we may need to switch to another task. */
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301 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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