2 FreeRTOS V7.5.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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66 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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69 /* Library includes. */
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70 #include "75x_uart.h"
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71 #include "75x_gpio.h"
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72 #include "75x_eic.h"
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73 #include "75x_mrcc.h"
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75 /* Scheduler includes. */
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76 #include "FreeRTOS.h"
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79 /* Demo application includes. */
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82 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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83 #define serNO_BLOCK ( ( portTickType ) 0 )
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85 /*-----------------------------------------------------------*/
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87 /* Queues used to hold received characters, and characters waiting to be
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89 static xQueueHandle xRxedChars;
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90 static xQueueHandle xCharsForTx;
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92 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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94 /*-----------------------------------------------------------*/
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96 /* The interrupt service routine - called from the assembly entry point. */
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97 __arm void vSerialISR( void );
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99 /*-----------------------------------------------------------*/
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102 * See the serial2.h header file.
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104 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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106 xComPortHandle xReturn;
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107 UART_InitTypeDef UART_InitStructure;
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108 GPIO_InitTypeDef GPIO_InitStructure;
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109 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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111 /* Create the queues used to hold Rx and Tx characters. */
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112 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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113 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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115 /* If the queues were created correctly then setup the serial port
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117 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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119 portENTER_CRITICAL();
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121 /* Enable the UART0 Clock. */
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122 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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124 /* Configure the UART0_Tx as alternate function */
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125 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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126 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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127 GPIO_Init(GPIO0, &GPIO_InitStructure);
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129 /* Configure the UART0_Rx as input floating */
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130 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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131 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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132 GPIO_Init(GPIO0, &GPIO_InitStructure);
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134 /* Configure UART0. */
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135 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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136 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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137 UART_InitStructure.UART_Parity = UART_Parity_No;
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138 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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139 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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140 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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141 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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142 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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143 UART_Init(UART0, &UART_InitStructure);
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145 /* Enable the UART0 */
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146 UART_Cmd(UART0, ENABLE);
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148 /* Configure the IEC for the UART interrupts. */
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149 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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150 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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151 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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152 EIC_IRQInit(&EIC_IRQInitStructure);
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154 xQueueEmpty = pdTRUE;
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155 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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157 portEXIT_CRITICAL();
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161 xReturn = ( xComPortHandle ) 0;
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164 /* This demo file only supports a single port but we have to return
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165 something to comply with the standard demo header file. */
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168 /*-----------------------------------------------------------*/
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170 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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172 /* The port handle is not required as this driver only supports one port. */
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175 /* Get the next character from the buffer. Return false if no characters
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176 are available, or arrive before xBlockTime expires. */
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177 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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186 /*-----------------------------------------------------------*/
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188 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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190 signed char *pxNext;
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192 /* A couple of parameters that this port does not use. */
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193 ( void ) usStringLength;
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196 /* NOTE: This implementation does not handle the queue being full as no
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197 block time is used! */
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199 /* The port handle is not required as this driver only supports UART0. */
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202 /* Send each character in the string, one at a time. */
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203 pxNext = ( signed char * ) pcString;
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206 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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210 /*-----------------------------------------------------------*/
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212 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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214 portBASE_TYPE xReturn;
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216 /* Place the character in the queue of characters to be transmitted. */
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217 portENTER_CRITICAL();
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219 if( xQueueEmpty == pdTRUE )
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221 UART0->DR = cOutChar;
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226 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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236 xQueueEmpty = pdFALSE;
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238 portEXIT_CRITICAL();
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242 /*-----------------------------------------------------------*/
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244 void vSerialClose( xComPortHandle xPort )
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246 /* Not supported as not required by the demo application. */
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248 /*-----------------------------------------------------------*/
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250 __arm void vSerialISR( void )
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253 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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257 if( UART0->MIS & UART_IT_Transmit )
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259 /* The interrupt was caused by the THR becoming empty. Are there any
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260 more characters to transmit? */
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261 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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263 /* A character was retrieved from the queue so can be sent to the
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269 xQueueEmpty = pdTRUE;
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272 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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275 if( UART0->MIS & UART_IT_Receive )
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277 /* The interrupt was caused by a character being received. Grab the
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278 character from the RHR and place it in the queue of received
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281 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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282 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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284 } while( UART0->MIS );
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286 /* If a task was woken by either a character being received or a character
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287 being transmitted then we may need to switch to another task. */
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288 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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