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Richard Barry
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20100923-V6.1.0-RC2/Demo/ARM7_AT91FR40008_GCC/serial/serial.c
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20100923-V6.1.0-RC2/Demo/ARM7_AT91FR40008_GCC/serial/serial.c
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/*
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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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/*
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BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR USART0.
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This file contains all the serial port components that can be compiled to
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either ARM or THUMB mode. Components that must be compiled to ARM mode are
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contained in serialISR.c.
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*/
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/* Standard includes. */
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#include <stdlib.h>
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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 "task.h"
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/* Demo application includes. */
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#include "serial.h"
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#include "AT91R40008.h"
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#include "usart.h"
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#include "pio.h"
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#include "aic.h"
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/*-----------------------------------------------------------*/
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/* Constants to setup and access the UART. */
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#define portUSART0_AIC_CHANNEL ( ( unsigned long ) 2 )
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#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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#define serHANDLE ( ( xComPortHandle ) 1 )
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#define serNO_BLOCK ( ( portTickType ) 0 )
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/*-----------------------------------------------------------*/
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/* Queues used to hold received characters, and characters waiting to be
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transmitted. */
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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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* The queues are created in serialISR.c as they are used from the ISR.
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* Obtain references to the queues and THRE Empty flag.
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*/
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extern void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars, xQueueHandle *pxCharsForTx );
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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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unsigned long ulSpeed;
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unsigned long ulCD;
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xComPortHandle xReturn = serHANDLE;
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extern void ( vUART_ISR_Wrapper )( void );
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/* The queues are used in the serial ISR routine, so are created from
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serialISR.c (which is always compiled to ARM mode. */
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vSerialISRCreateQueues( uxQueueLength, &xRxedChars, &xCharsForTx );
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if(
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( xRxedChars != serINVALID_QUEUE ) &&
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( xCharsForTx != serINVALID_QUEUE ) &&
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( ulWantedBaud != ( unsigned long ) 0 )
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)
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{
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portENTER_CRITICAL();
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{
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/* Enable clock to USART0... */
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AT91C_BASE_PS->PS_PCER = AT91C_PS_US0;
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/* Disable all USART0 interrupt sources to begin... */
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AT91C_BASE_US0->US_IDR = 0xFFFFFFFF;
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/* Reset various status bits (just in case)... */
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AT91C_BASE_US0->US_CR = US_RSTSTA;
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AT91C_BASE_PIO->PIO_PDR = TXD0 | RXD0; /* Enable RXD and TXD pins */
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AT91C_BASE_US0->US_CR = US_RSTRX | US_RSTTX | US_RXDIS | US_TXDIS;
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/* Clear Transmit and Receive Counters */
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AT91C_BASE_US0->US_RCR = 0;
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AT91C_BASE_US0->US_TCR = 0;
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/* Input clock to baud rate generator is MCK */
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ulSpeed = configCPU_CLOCK_HZ * 10;
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ulSpeed = ulSpeed / 16;
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ulSpeed = ulSpeed / ulWantedBaud;
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/* compute the error */
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ulCD = ulSpeed / 10;
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if ((ulSpeed - (ulCD * 10)) >= 5)
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ulCD++;
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/* Define the baud rate divisor register */
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AT91C_BASE_US0->US_BRGR = ulCD;
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/* Define the USART mode */
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AT91C_BASE_US0->US_MR = US_CLKS_MCK | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1 | US_CHMODE_NORMAL;
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/* Write the Timeguard Register */
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AT91C_BASE_US0->US_TTGR = 0;
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/* Setup the interrupt for USART0.
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Store interrupt handler function address in USART0 vector register... */
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AT91C_BASE_AIC->AIC_SVR[ portUSART0_AIC_CHANNEL ] = (unsigned long)vUART_ISR_Wrapper;
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/* USART0 interrupt level-sensitive, priority 1... */
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AT91C_BASE_AIC->AIC_SMR[ portUSART0_AIC_CHANNEL ] = AIC_SRCTYPE_INT_LEVEL_SENSITIVE | 1;
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/* Clear some pending USART0 interrupts (just in case)... */
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AT91C_BASE_US0->US_CR = US_RSTSTA;
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/* Enable USART0 interrupt sources (but not Tx for now)... */
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AT91C_BASE_US0->US_IER = US_RXRDY;
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/* Enable USART0 interrupts in the AIC... */
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AT91C_BASE_AIC->AIC_IECR = ( 1 << portUSART0_AIC_CHANNEL );
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/* Enable receiver and transmitter... */
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AT91C_BASE_US0->US_CR = US_RXEN | US_TXEN;
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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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xReturn = ( xComPortHandle ) 0;
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}
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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 UART0. */
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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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/* 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 UART0. */
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( void ) pxPort;
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( void ) usStringLength;
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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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( void ) pxPort;
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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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return pdFAIL;
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}
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/* Turn on the Tx interrupt so the ISR will remove the character from the
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queue and send it. This does not need to be in a critical section as
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if the interrupt has already removed the character the next interrupt
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will simply turn off the Tx interrupt again. */
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AT91C_BASE_US0->US_IER = US_TXRDY;
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return pdPASS;
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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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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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