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jeremybenn |
/*
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FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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INTERRUPT DRIVEN SERIAL PORT DRIVER.
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*/
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/******************************************************************************
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*** NOTE: COM0 == USART1, COM1 == USART2
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******************************************************************************/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "queue.h"
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#include "semphr.h"
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/* Library includes. */
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#include "stm32f10x_lib.h"
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/* Driver includes. */
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#include "STM32_USART.h"
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/*-----------------------------------------------------------*/
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/* The number of COM ports that can be controlled at the same time. */
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#define serNUM_COM_PORTS ( 2 )
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/* Queues are used to hold characters that are waiting to be transmitted. This
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constant sets the maximum number of characters that can be contained in such a
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queue at any one time. */
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#define serTX_QUEUE_LEN ( 100 )
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/* Queues are used to hold characters that have been received but not yet
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processed. This constant sets the maximum number of characters that can be
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contained in such a queue. */
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#define serRX_QUEUE_LEN ( 100 )
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/* The maximum amount of time that calls to lSerialPutString() should wait for
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there to be space to post each character to the queue of characters waiting
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transmission. NOTE! This is the time to wait per character - not the time to
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wait for the entire string. */
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#define serPUT_STRING_CHAR_DELAY ( 5 / portTICK_RATE_MS )
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/*-----------------------------------------------------------*/
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/* References to the USART peripheral addresses themselves. */
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static USART_TypeDef * const xUARTS[ serNUM_COM_PORTS ] = { ( ( USART_TypeDef * ) USART1_BASE ), ( ( USART_TypeDef * ) USART2_BASE ) };
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/* Queues used to hold characters waiting to be transmitted - one queue per port. */
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static xQueueHandle xCharsForTx[ serNUM_COM_PORTS ] = { 0 };
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/* Queues holding received characters - one queue per port. */
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static xQueueHandle xRxedChars[ serNUM_COM_PORTS ] = { 0 };
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/*-----------------------------------------------------------*/
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/* UART interrupt handlers, as named in the vector table. */
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void USART1_IRQHandler( void );
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void USART2_IRQHandler( void );
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/*-----------------------------------------------------------*/
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/*
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* See header file for parameter descriptions.
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*/
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long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud )
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{
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long lReturn = pdFAIL;
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USART_InitTypeDef USART_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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if( ulPort < serNUM_COM_PORTS )
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{
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/* The common (not port dependent) part of the initialisation. */
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USART_InitStructure.USART_BaudRate = ulWantedBaud;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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/* Init the buffer structures with the buffer for the COM port being
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initialised, and perform any non-common initialisation necessary. This
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does not check to see if the COM port has already been initialised. */
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if( ulPort == 0 )
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{
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/* Create the queue of chars that are waiting to be sent to COM0. */
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xCharsForTx[ 0 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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/* Create the queue used to hold characters received from COM0. */
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xRxedChars[ 0 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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/* Enable COM0 clock - the ST libraries start numbering from UART1. */
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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/* Configure USART1 Rx (PA10) as input floating */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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/* Configure USART1 Tx (PA9) as alternate function push-pull */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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USART_Init( USART1, &USART_InitStructure );
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USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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NVIC_Init( &NVIC_InitStructure );
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USART_DMACmd( USART1, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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USART_Cmd( USART1, ENABLE );
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/* Everything is ok. */
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lReturn = pdPASS;
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}
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else if( ulPort == 1 )
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{
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/* Create the queue of chars that are waiting to be sent to COM1. */
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xCharsForTx[ 1 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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/* Create the queue used to hold characters received from COM0. */
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xRxedChars[ 1 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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/* Enable COM0 clock - the ST libraries start numbering from 1. */
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RCC_APB2PeriphClockCmd( RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE );
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/* Configure USART2 Rx (PA3) as input floating */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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/* Configure USART2 Tx (PA2) as alternate function push-pull */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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USART_Init( USART2, &USART_InitStructure );
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USART_ITConfig( USART2, USART_IT_RXNE, ENABLE );
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NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
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NVIC_Init( &NVIC_InitStructure );
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USART_DMACmd( USART2, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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USART_Cmd( USART2, ENABLE );
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/* Everything is ok. */
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lReturn = pdPASS;
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}
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else
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{
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/* Nothing to do unless more than two ports are supported. */
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}
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}
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return lReturn;
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}
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/*-----------------------------------------------------------*/
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signed long xSerialGetChar( long lPort, signed char *pcRxedChar, portTickType xBlockTime )
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{
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long lReturn = pdFAIL;
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if( lPort < serNUM_COM_PORTS )
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{
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if( xQueueReceive( xRxedChars[ lPort ], pcRxedChar, xBlockTime ) == pdPASS )
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{
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lReturn = pdPASS;
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}
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}
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return lReturn;
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}
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/*-----------------------------------------------------------*/
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long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength )
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{
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long lReturn;
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unsigned long ul;
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if( lPort < serNUM_COM_PORTS )
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{
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lReturn = pdPASS;
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for( ul = 0; ul < ulStringLength; ul++ )
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{
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if( xQueueSend( xCharsForTx[ lPort ], &( pcString[ ul ] ), serPUT_STRING_CHAR_DELAY ) != pdPASS )
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{
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/* Cannot fit any more in the queue. Try turning the Tx on to
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clear some space. */
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USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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vTaskDelay( serPUT_STRING_CHAR_DELAY );
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/* Go back and try again. */
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continue;
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}
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}
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USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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}
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else
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{
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lReturn = pdFAIL;
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}
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return lReturn;
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}
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/*-----------------------------------------------------------*/
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signed long xSerialPutChar( long lPort, signed char cOutChar, portTickType xBlockTime )
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{
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long lReturn;
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if( xQueueSend( xCharsForTx[ lPort ], &cOutChar, xBlockTime ) == pdPASS )
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{
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lReturn = pdPASS;
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USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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}
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else
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{
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lReturn = pdFAIL;
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}
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return lReturn;
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}
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/*-----------------------------------------------------------*/
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void USART1_IRQHandler( void )
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{
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long xHigherPriorityTaskWoken = pdFALSE;
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char cChar;
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if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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{
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/* The interrupt was caused by the THR becoming empty. Are there any
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more characters to transmit? */
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if( xQueueReceiveFromISR( xCharsForTx[ 0 ], &cChar, &xHigherPriorityTaskWoken ) )
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{
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/* A character was retrieved from the buffer so can be sent to the
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THR now. */
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USART_SendData( USART1, cChar );
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}
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else
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{
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USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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}
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}
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if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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{
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cChar = USART_ReceiveData( USART1 );
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xQueueSendFromISR( xRxedChars[ 0 ], &cChar, &xHigherPriorityTaskWoken );
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}
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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/*-----------------------------------------------------------*/
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void USART2_IRQHandler( void )
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{
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}
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