2 FreeRTOS V8.2.0 - Copyright (C) 2015 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 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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71 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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74 /* Library includes. */
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75 #include "75x_uart.h"
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76 #include "75x_gpio.h"
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77 #include "75x_eic.h"
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78 #include "75x_mrcc.h"
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80 /* Scheduler includes. */
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81 #include "FreeRTOS.h"
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84 /* Demo application includes. */
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87 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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88 #define serNO_BLOCK ( ( TickType_t ) 0 )
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90 /*-----------------------------------------------------------*/
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92 /* Queues used to hold received characters, and characters waiting to be
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94 static QueueHandle_t xRxedChars;
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95 static QueueHandle_t xCharsForTx;
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97 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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99 /*-----------------------------------------------------------*/
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101 /* The interrupt service routine - called from the assembly entry point. */
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102 __arm void vSerialISR( void );
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104 /*-----------------------------------------------------------*/
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107 * See the serial2.h header file.
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109 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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111 xComPortHandle xReturn;
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112 UART_InitTypeDef UART_InitStructure;
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113 GPIO_InitTypeDef GPIO_InitStructure;
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114 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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116 /* Create the queues used to hold Rx and Tx characters. */
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117 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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118 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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120 /* If the queues were created correctly then setup the serial port
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122 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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124 portENTER_CRITICAL();
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126 /* Enable the UART0 Clock. */
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127 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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129 /* Configure the UART0_Tx as alternate function */
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130 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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131 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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132 GPIO_Init(GPIO0, &GPIO_InitStructure);
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134 /* Configure the UART0_Rx as input floating */
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135 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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136 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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137 GPIO_Init(GPIO0, &GPIO_InitStructure);
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139 /* Configure UART0. */
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140 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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141 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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142 UART_InitStructure.UART_Parity = UART_Parity_No;
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143 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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144 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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145 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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146 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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147 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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148 UART_Init(UART0, &UART_InitStructure);
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150 /* Enable the UART0 */
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151 UART_Cmd(UART0, ENABLE);
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153 /* Configure the IEC for the UART interrupts. */
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154 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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155 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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156 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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157 EIC_IRQInit(&EIC_IRQInitStructure);
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159 xQueueEmpty = pdTRUE;
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160 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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162 portEXIT_CRITICAL();
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166 xReturn = ( xComPortHandle ) 0;
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169 /* This demo file only supports a single port but we have to return
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170 something to comply with the standard demo header file. */
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173 /*-----------------------------------------------------------*/
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175 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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177 /* The port handle is not required as this driver only supports one port. */
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180 /* Get the next character from the buffer. Return false if no characters
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181 are available, or arrive before xBlockTime expires. */
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182 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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191 /*-----------------------------------------------------------*/
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193 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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195 signed char *pxNext;
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197 /* A couple of parameters that this port does not use. */
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198 ( void ) usStringLength;
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201 /* NOTE: This implementation does not handle the queue being full as no
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202 block time is used! */
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204 /* The port handle is not required as this driver only supports UART0. */
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207 /* Send each character in the string, one at a time. */
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208 pxNext = ( signed char * ) pcString;
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211 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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215 /*-----------------------------------------------------------*/
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217 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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219 portBASE_TYPE xReturn;
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221 /* Place the character in the queue of characters to be transmitted. */
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222 portENTER_CRITICAL();
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224 if( xQueueEmpty == pdTRUE )
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226 UART0->DR = cOutChar;
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231 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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241 xQueueEmpty = pdFALSE;
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243 portEXIT_CRITICAL();
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247 /*-----------------------------------------------------------*/
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249 void vSerialClose( xComPortHandle xPort )
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251 /* Not supported as not required by the demo application. */
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253 /*-----------------------------------------------------------*/
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255 __arm void vSerialISR( void )
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258 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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262 if( UART0->MIS & UART_IT_Transmit )
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264 /* The interrupt was caused by the THR becoming empty. Are there any
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265 more characters to transmit? */
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266 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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268 /* A character was retrieved from the queue so can be sent to the
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274 xQueueEmpty = pdTRUE;
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277 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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280 if( UART0->MIS & UART_IT_Receive )
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282 /* The interrupt was caused by a character being received. Grab the
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283 character from the RHR and place it in the queue of received
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286 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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287 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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289 } while( UART0->MIS );
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291 /* If a task was woken by either a character being received or a character
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292 being transmitted then we may need to switch to another task. */
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293 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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