Complete the IAR FM3 demo.
Richard Barry
14 years ago
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/*
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FreeRTOS V7.0.0 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and 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 modification to the GPL is included to allow you to
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or 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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BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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***Note*** This example uses queues to send each character into an interrupt
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service routine and out of an interrupt service routine individually. This
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is done to demonstrate queues being used in an interrupt, and to deliberately
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load the system to test the FreeRTOS port. It is *NOT* meant to be an
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example of an efficient implementation. An efficient implementation should
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use FIFO's or DMA if available, and only use FreeRTOS API functions when
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enough has been received to warrant a task being unblocked to process the
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data.
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*/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "semphr.h"
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#include "comtest2.h"
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/* Library includes. */
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#include "mb9bf506n.h"
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#include "system_mb9bf50x.h"
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/* Demo application includes. */
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#include "serial.h"
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/*-----------------------------------------------------------*/
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/* Register bit definitions. */
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#define serRX_INT_ENABLE 0x10
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#define serTX_INT_ENABLE 0x08
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#define serRX_ENABLE 0x02
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#define serTX_ENABLE 0x01
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#define serORE_ERROR_BIT 0x08
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#define serFRE_ERROR_BIT 0x10
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#define serPE_ERROR_BIT 0x20
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#define serRX_INT 0x04
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#define serTX_INT 0x02
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/* Misc defines. */
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#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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#define serNO_BLOCK ( ( portTickType ) 0 )
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/*-----------------------------------------------------------*/
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/* The queue used to hold received characters. */
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static xQueueHandle xRxedChars;
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static xQueueHandle xCharsForTx;
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/*-----------------------------------------------------------*/
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/*
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* See the serial2.h header file.
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*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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xComPortHandle xReturn;
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/* Create the queues used to hold Rx/Tx characters. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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/* If the queues were created correctly then setup the serial port
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hardware. */
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if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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{
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/* Ensure interrupts don't fire during the init process. Interrupts
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will be enabled automatically when the first task start running. */
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portDISABLE_INTERRUPTS();
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/* Configure P21 and P22 for use by the UART. */
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FM3_GPIO->PFR2 |= ( 1 << 0x01 ) | ( 1 << 0x02 );
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/* SIN0_0 and SOT0_0. */
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FM3_GPIO->EPFR07 |= ( 1 << 6 );
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/* Reset. */
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FM3_MFS0_UART->SCR = 0x80;
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/* Enable output in mode 0. */
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FM3_MFS0_UART->SMR = 0x01;
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/* Clear all errors that may already be present. */
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FM3_MFS0_UART->SSR = 0x00;
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FM3_MFS0_UART->ESCR = 0x00;
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FM3_MFS0_UART->BGR = ( configCPU_CLOCK_HZ / 2UL ) / ( ulWantedBaud - 1UL );
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/* Enable Rx, Tx, and the Rx interrupt. */
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FM3_MFS0_UART->SCR |= ( serRX_ENABLE | serTX_ENABLE | serRX_INT_ENABLE );
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/* Configure the NVIC for UART interrupts. */
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NVIC_ClearPendingIRQ( MFS0RX_IRQn );
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NVIC_EnableIRQ( MFS0RX_IRQn );
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/* The priority *MUST* be at or below
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configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY as FreeRTOS API functions
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are called in the interrupt handler. */
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NVIC_SetPriority( MFS0RX_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
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/* Do the same for the Tx interrupts. */
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NVIC_ClearPendingIRQ( MFS0TX_IRQn );
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NVIC_EnableIRQ( MFS0TX_IRQn );
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/* The priority *MUST* be at or below
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configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY as FreeRTOS API functions
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are called in the interrupt handler. */
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NVIC_SetPriority( MFS0TX_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
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}
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else
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{
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xReturn = ( xComPortHandle ) 0;
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}
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/* This demo file only supports a single port but we have to return
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something to comply with the standard demo header file. */
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
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{
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/* The port handle is not required as this driver only supports one port. */
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( void ) pxPort;
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/* Get the next character from the buffer. Return false if no characters
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are available, or arrive before xBlockTime expires. */
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if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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{
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signed char *pxNext;
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/* A couple of parameters that this port does not use. */
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( void ) usStringLength;
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( void ) pxPort;
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/* NOTE: This implementation does not handle the queue being full as no
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block time is used! */
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/* The port handle is not required as this driver only supports one UART. */
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( void ) pxPort;
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/* Send each character in the string, one at a time. */
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pxNext = ( signed char * ) pcString;
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while( *pxNext )
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{
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xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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pxNext++;
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}
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
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{
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signed portBASE_TYPE xReturn;
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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{
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xReturn = pdPASS;
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/* Enable the UART Tx interrupt. */
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FM3_MFS0_UART->SCR |= serTX_INT_ENABLE;
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}
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else
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{
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xReturn = pdFAIL;
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Not supported as not required by the demo application. */
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}
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/*-----------------------------------------------------------*/
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void MFS0RX_IRQHandler( void )
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{
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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char cChar;
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if( ( FM3_MFS0_UART->SSR & ( serORE_ERROR_BIT | serFRE_ERROR_BIT | serPE_ERROR_BIT ) ) != 0 )
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{
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/* A PE, ORE or FRE error occurred. Clear it. */
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FM3_MFS0_UART->SSR |= ( 1 << 7 );
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cChar = FM3_MFS0_UART->RDR;
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}
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else if( FM3_MFS0_UART->SSR & serRX_INT )
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{
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/* A character has been received on the USART, send it to the Rx
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handler task. */
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cChar = FM3_MFS0_UART->RDR;
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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}
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/* If sending or receiving from a queue has caused a task to unblock, and
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the unblocked task has a priority equal to or higher than the currently
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running task (the task this ISR interrupted), then xHigherPriorityTaskWoken
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will have automatically been set to pdTRUE within the queue send or receive
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function. portEND_SWITCHING_ISR() will then ensure that this ISR returns
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directly to the higher priority unblocked task. */
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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/*-----------------------------------------------------------*/
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void MFS0TX_IRQHandler( void )
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{
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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char cChar;
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if( FM3_MFS0_UART->SSR & serTX_INT )
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{
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/* The interrupt was caused by the TX register becoming empty. Are
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there any more characters to transmit? */
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* A character was retrieved from the queue so can be sent to the
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USART now. */
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FM3_MFS0_UART->TDR = cChar;
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}
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else
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{
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/* Disable the Tx interrupt. */
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FM3_MFS0_UART->SCR &= ~serTX_INT_ENABLE;
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}
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}
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/* If sending or receiving from a queue has caused a task to unblock, and
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the unblocked task has a priority equal to or higher than the currently
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running task (the task this ISR interrupted), then xHigherPriorityTaskWoken
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will have automatically been set to pdTRUE within the queue send or receive
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function. portEND_SWITCHING_ISR() will then ensure that this ISR returns
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directly to the higher priority unblocked task. */
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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