2 * FreeRTOS Kernel V10.2.0
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3 * Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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29 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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32 /* Scheduler includes. */
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33 #include "FreeRTOS.h"
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37 /* Library includes. */
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38 #include "stm32f10x_lib.h"
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40 /* Demo application includes. */
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42 /*-----------------------------------------------------------*/
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45 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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46 #define serNO_BLOCK ( ( TickType_t ) 0 )
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47 #define serTX_BLOCK_TIME ( 40 / portTICK_PERIOD_MS )
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49 /*-----------------------------------------------------------*/
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51 /* The queue used to hold received characters. */
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52 static QueueHandle_t xRxedChars;
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53 static QueueHandle_t xCharsForTx;
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55 /*-----------------------------------------------------------*/
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57 /* UART interrupt handler. */
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58 void vUARTInterruptHandler( void );
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60 /*-----------------------------------------------------------*/
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63 * See the serial2.h header file.
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65 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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67 xComPortHandle xReturn;
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68 USART_InitTypeDef USART_InitStructure;
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69 NVIC_InitTypeDef NVIC_InitStructure;
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70 GPIO_InitTypeDef GPIO_InitStructure;
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72 /* Create the queues used to hold Rx/Tx characters. */
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73 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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74 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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76 /* If the queue/semaphore was created correctly then setup the serial port
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78 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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80 /* Enable USART1 clock */
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81 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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83 /* Configure USART1 Rx (PA10) as input floating */
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84 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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85 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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86 GPIO_Init( GPIOA, &GPIO_InitStructure );
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88 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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89 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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90 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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91 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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92 GPIO_Init( GPIOA, &GPIO_InitStructure );
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94 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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95 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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96 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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97 USART_InitStructure.USART_Parity = USART_Parity_No ;
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98 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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99 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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100 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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101 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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102 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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103 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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105 USART_Init( USART1, &USART_InitStructure );
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107 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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109 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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110 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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111 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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112 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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113 NVIC_Init( &NVIC_InitStructure );
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115 USART_Cmd( USART1, ENABLE );
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119 xReturn = ( xComPortHandle ) 0;
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122 /* This demo file only supports a single port but we have to return
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123 something to comply with the standard demo header file. */
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126 /*-----------------------------------------------------------*/
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128 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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130 /* The port handle is not required as this driver only supports one port. */
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133 /* Get the next character from the buffer. Return false if no characters
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134 are available, or arrive before xBlockTime expires. */
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135 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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144 /*-----------------------------------------------------------*/
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146 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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148 signed char *pxNext;
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150 /* A couple of parameters that this port does not use. */
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151 ( void ) usStringLength;
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154 /* NOTE: This implementation does not handle the queue being full as no
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155 block time is used! */
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157 /* The port handle is not required as this driver only supports UART1. */
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160 /* Send each character in the string, one at a time. */
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161 pxNext = ( signed char * ) pcString;
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164 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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168 /*-----------------------------------------------------------*/
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170 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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172 signed portBASE_TYPE xReturn;
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174 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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177 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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186 /*-----------------------------------------------------------*/
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188 void vSerialClose( xComPortHandle xPort )
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190 /* Not supported as not required by the demo application. */
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192 /*-----------------------------------------------------------*/
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194 void vUARTInterruptHandler( void )
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196 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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199 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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201 /* The interrupt was caused by the THR becoming empty. Are there any
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202 more characters to transmit? */
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203 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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205 /* A character was retrieved from the queue so can be sent to the
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207 USART_SendData( USART1, cChar );
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211 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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215 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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217 cChar = USART_ReceiveData( USART1 );
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218 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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221 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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