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248 lines
9.4 KiB
C
248 lines
9.4 KiB
C
/*
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FreeRTOS V6.1.0 - Copyright (C) 2010 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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/* 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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