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261 lines
10 KiB
C
261 lines
10 KiB
C
/*
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FreeRTOS V7.1.1 - Copyright (C) 2012 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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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong? *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, training, latest information,
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license and contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool.
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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provide a safety engineered and independently SIL3 certified version under
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the SafeRTOS brand: http://www.SafeRTOS.com.
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*/
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/* NOTE: This is just a test file and not intended to be a generic
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COM driver. */
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#include "altera_avalon_uart.h"
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#include "altera_avalon_uart_regs.h"
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#include "sys/alt_irq.h"
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "system.h"
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#include "Serial.h"
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/*---------------------------------------------------------------------------*/
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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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static xQueueHandle xRxedChars;
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static xQueueHandle xCharsForTx;
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alt_u32 uartControl;
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/*---------------------------------------------------------------------------*/
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static void vUARTInterruptHandler( void* context, alt_u32 id );
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static void vUARTReceiveHandler( alt_u32 status );
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static void vUARTTransmitHandler( alt_u32 status );
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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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/* Create the queues used to hold Rx and 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 hardware. */
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if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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{
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portENTER_CRITICAL();
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{
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uartControl = ALTERA_AVALON_UART_CONTROL_RTS_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_DCTS_MSK;
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IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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/* register the interrupt handler */
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alt_irq_register ( UART_IRQ, NULL, vUARTInterruptHandler );
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}
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portEXIT_CRITICAL();
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}
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else
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{
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return ( xComPortHandle ) 0;
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}
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return ( xComPortHandle ) 1;
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}
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/*---------------------------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Never used. */
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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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uartControl |= ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
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IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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return pdFALSE;
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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 lReturn = pdPASS;
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/* Place the character in the queue of characters to be transmitted. */
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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{
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/*Triggers an interrupt on every character or (down) when queue is full. */
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uartControl |= ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
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IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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lReturn = pdPASS;
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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 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 block time is used! */
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/* The port handle is not required as this driver only supports UART0. */
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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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static void vUARTInterruptHandler( void* context, alt_u32 id )
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{
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alt_u32 status;
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/* Read the status register in order to determine the cause of the
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interrupt. */
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status = IORD_ALTERA_AVALON_UART_STATUS( UART_BASE );
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/* Clear any error flags set at the device */
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IOWR_ALTERA_AVALON_UART_STATUS( UART_BASE, 0 );
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/* process a read irq */
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if ( status & ALTERA_AVALON_UART_STATUS_RRDY_MSK )
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{
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vUARTReceiveHandler( status );
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}
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/* process a write irq */
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if ( status & ( ALTERA_AVALON_UART_STATUS_TRDY_MSK ) )
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{
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vUARTTransmitHandler( status );
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}
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}
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/*---------------------------------------------------------------------------*/
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static void vUARTReceiveHandler( alt_u32 status )
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{
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signed char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* If there was an error, discard the data */
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if ( status & ( ALTERA_AVALON_UART_STATUS_PE_MSK | ALTERA_AVALON_UART_STATUS_FE_MSK ) )
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{
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asm("break");
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return;
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}
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/* Transfer data from the device to the circular buffer */
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cChar = IORD_ALTERA_AVALON_UART_RXDATA( UART_BASE );
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if ( pdTRUE != xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ) )
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{
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/* If the circular buffer was full, disable interrupts. Interrupts will
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be re-enabled when data is removed from the buffer. */
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uartControl &= ~ALTERA_AVALON_UART_CONTROL_RRDY_MSK;
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IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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}
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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/*---------------------------------------------------------------------------*/
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static void vUARTTransmitHandler( alt_u32 status )
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{
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signed char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* Transfer data if there is some ready to be transferred */
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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IOWR_ALTERA_AVALON_UART_TXDATA( UART_BASE, cChar );
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}
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else
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{
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uartControl &= ~ALTERA_AVALON_UART_CONTROL_TRDY_MSK;
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}
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IOWR_ALTERA_AVALON_UART_CONTROL( UART_BASE, uartControl );
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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/*---------------------------------------------------------------------------*/
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