2 FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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68 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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71 /* Library includes. */
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72 #include "75x_uart.h"
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73 #include "75x_gpio.h"
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74 #include "75x_eic.h"
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75 #include "75x_mrcc.h"
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77 /* Scheduler includes. */
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78 #include "FreeRTOS.h"
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81 /* Demo application includes. */
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84 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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85 #define serNO_BLOCK ( ( portTickType ) 0 )
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87 /*-----------------------------------------------------------*/
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89 /* Queues used to hold received characters, and characters waiting to be
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91 static xQueueHandle xRxedChars;
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92 static xQueueHandle xCharsForTx;
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94 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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96 /*-----------------------------------------------------------*/
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98 /* The interrupt service routine - called from the assembly entry point. */
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99 __arm void vSerialISR( void );
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101 /*-----------------------------------------------------------*/
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104 * See the serial2.h header file.
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106 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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108 xComPortHandle xReturn;
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109 UART_InitTypeDef UART_InitStructure;
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110 GPIO_InitTypeDef GPIO_InitStructure;
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111 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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113 /* Create the queues used to hold Rx and Tx characters. */
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114 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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115 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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117 /* If the queues were created correctly then setup the serial port
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119 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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121 portENTER_CRITICAL();
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123 /* Enable the UART0 Clock. */
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124 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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126 /* Configure the UART0_Tx as alternate function */
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127 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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128 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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129 GPIO_Init(GPIO0, &GPIO_InitStructure);
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131 /* Configure the UART0_Rx as input floating */
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132 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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133 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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134 GPIO_Init(GPIO0, &GPIO_InitStructure);
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136 /* Configure UART0. */
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137 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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138 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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139 UART_InitStructure.UART_Parity = UART_Parity_No;
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140 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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141 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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142 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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143 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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144 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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145 UART_Init(UART0, &UART_InitStructure);
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147 /* Enable the UART0 */
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148 UART_Cmd(UART0, ENABLE);
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150 /* Configure the IEC for the UART interrupts. */
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151 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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152 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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153 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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154 EIC_IRQInit(&EIC_IRQInitStructure);
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156 xQueueEmpty = pdTRUE;
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157 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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159 portEXIT_CRITICAL();
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163 xReturn = ( xComPortHandle ) 0;
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166 /* This demo file only supports a single port but we have to return
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167 something to comply with the standard demo header file. */
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170 /*-----------------------------------------------------------*/
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172 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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174 /* The port handle is not required as this driver only supports one port. */
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177 /* Get the next character from the buffer. Return false if no characters
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178 are available, or arrive before xBlockTime expires. */
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179 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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188 /*-----------------------------------------------------------*/
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190 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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192 signed char *pxNext;
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194 /* A couple of parameters that this port does not use. */
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195 ( void ) usStringLength;
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198 /* NOTE: This implementation does not handle the queue being full as no
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199 block time is used! */
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201 /* The port handle is not required as this driver only supports UART0. */
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204 /* Send each character in the string, one at a time. */
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205 pxNext = ( signed char * ) pcString;
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208 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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212 /*-----------------------------------------------------------*/
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214 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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216 portBASE_TYPE xReturn;
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218 /* Place the character in the queue of characters to be transmitted. */
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219 portENTER_CRITICAL();
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221 if( xQueueEmpty == pdTRUE )
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223 UART0->DR = cOutChar;
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228 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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238 xQueueEmpty = pdFALSE;
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240 portEXIT_CRITICAL();
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244 /*-----------------------------------------------------------*/
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246 void vSerialClose( xComPortHandle xPort )
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248 /* Not supported as not required by the demo application. */
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250 /*-----------------------------------------------------------*/
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252 __arm void vSerialISR( void )
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255 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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259 if( UART0->MIS & UART_IT_Transmit )
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261 /* The interrupt was caused by the THR becoming empty. Are there any
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262 more characters to transmit? */
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263 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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265 /* A character was retrieved from the queue so can be sent to the
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271 xQueueEmpty = pdTRUE;
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274 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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277 if( UART0->MIS & UART_IT_Receive )
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279 /* The interrupt was caused by a character being received. Grab the
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280 character from the RHR and place it in the queue of received
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283 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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284 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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286 } while( UART0->MIS );
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288 /* If a task was woken by either a character being received or a character
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289 being transmitted then we may need to switch to another task. */
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290 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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