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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM9_STR91X_IAR/] [serial/] [serial.c] - Blame information for rev 583

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1 577 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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        BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART1.
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*/
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/* Library includes. */
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#include "91x_lib.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 "semphr.h"
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/* Demo application includes. */
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#include "serial.h"
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/*-----------------------------------------------------------*/
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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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#define serTX_BLOCK_TIME                                ( 40 / portTICK_RATE_MS )
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/* Interrupt and status bit definitions. */
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#define mainTXRIS 0x20  
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#define mainRXRIS 0x50
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#define serTX_FIFO_FULL 0x20
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#define serCLEAR_ALL_INTERRUPTS 0x3ff
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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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/* The semaphore used to wake a task waiting for space to become available
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in the FIFO. */
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static xSemaphoreHandle xTxFIFOSemaphore;
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/*-----------------------------------------------------------*/
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/* UART interrupt handler. */
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void UART1_IRQHandler( void );
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/* The interrupt service routine - called from the assembly entry point. */
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__arm void UART1_IRQHandler( void );
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/*-----------------------------------------------------------*/
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/* Flag to indicate whether or not a task is blocked waiting for space on
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the FIFO. */
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static long lTaskWaiting = pdFALSE;
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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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UART_InitTypeDef xUART1_Init;
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GPIO_InitTypeDef GPIO_InitStructure;
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        /* Create the queues used to hold Rx characters. */
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        xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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        /* Create the semaphore used to wake a task waiting for space to become
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        available in the FIFO. */
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        vSemaphoreCreateBinary( xTxFIFOSemaphore );
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        /* If the queue/semaphore was created correctly then setup the serial port
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        hardware. */
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        if( ( xRxedChars != serINVALID_QUEUE ) && ( xTxFIFOSemaphore != serINVALID_QUEUE ) )
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        {
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                /* Pre take the semaphore so a task will block if it tries to access
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                it. */
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                xSemaphoreTake( xTxFIFOSemaphore, 0 );
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                /* Configure the UART. */
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                xUART1_Init.UART_WordLength = UART_WordLength_8D;
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                xUART1_Init.UART_StopBits = UART_StopBits_1;
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                xUART1_Init.UART_Parity = UART_Parity_No;
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                xUART1_Init.UART_BaudRate = ulWantedBaud;
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                xUART1_Init.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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                xUART1_Init.UART_Mode = UART_Mode_Tx_Rx;
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                xUART1_Init.UART_FIFO = UART_FIFO_Enable;
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                /* Enable the UART1 Clock */
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                SCU_APBPeriphClockConfig( __UART1, ENABLE );
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                /* Enable the GPIO3 Clock */
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                SCU_APBPeriphClockConfig( __GPIO3, ENABLE );
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                /* Configure UART1_Rx pin GPIO3.2 */
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                GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
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                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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                GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
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                GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
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                GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1 ;
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                GPIO_Init( GPIO3, &GPIO_InitStructure );
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                /* Configure UART1_Tx pin GPIO3.3 */
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                GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
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                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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                GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
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                GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
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                GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2 ;
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                GPIO_Init( GPIO3, &GPIO_InitStructure );
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                portENTER_CRITICAL();
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                {
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                        /* Configure the UART itself. */
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                        UART_DeInit( UART1 );
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                        UART_Init( UART1, &xUART1_Init );
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                        UART_ITConfig( UART1, UART_IT_Receive | UART_IT_Transmit, ENABLE );
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                        UART1->ICR = serCLEAR_ALL_INTERRUPTS;
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                        UART_LoopBackConfig( UART1, DISABLE );
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                        UART_IrDACmd( IrDA1, DISABLE );
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                        /* Configure the VIC for the UART interrupts. */
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                        VIC_Config( UART1_ITLine, VIC_IRQ, 9 );
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                        VIC_ITCmd( UART1_ITLine, ENABLE );
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                        UART_Cmd( UART1, ENABLE );
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                        lTaskWaiting = pdFALSE;
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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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        /* 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 UART1. */
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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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portBASE_TYPE xReturn;
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        portENTER_CRITICAL();
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        {
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                /* Can we write to the FIFO? */
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                if( UART1->FR & serTX_FIFO_FULL )
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                {
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                        /* Wait for the interrupt letting us know there is space on the
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                        FIFO.  It is ok to block in a critical section, interrupts will be
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                        enabled for other tasks once we force a switch. */
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                        lTaskWaiting = pdTRUE;
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                        /* Just to be a bit different this driver uses a semaphore to
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                        block the sending task when the FIFO is full.  The standard COMTest
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                        task assumes a queue of adequate length exists so does not use
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                        a block time.  For this demo the block time is therefore hard
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                        coded. */
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                        xReturn = xSemaphoreTake( xTxFIFOSemaphore, serTX_BLOCK_TIME );
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                        if( xReturn )
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                        {
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                                UART1->DR = cOutChar;
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                        }
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                }
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                else
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                {
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                        UART1->DR = cOutChar;
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                        xReturn = pdPASS;
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                }
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        }
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        portEXIT_CRITICAL();
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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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274
void UART1_IRQHandler( void )
275
{
276
signed char cChar;
277
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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        while( UART1->RIS &     mainRXRIS )
280
        {
281
                /* The interrupt was caused by a character being received.  Grab the
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                character from the DR and place it in the queue of received
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                characters. */
284
                cChar = UART1->DR;
285
                xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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        }
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        if( UART1->RIS & mainTXRIS )
289
        {
290
                if( lTaskWaiting == pdTRUE )
291
                {
292
                        /* This interrupt was caused by space becoming available on the Tx
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                        FIFO, wake any task that is waiting to post (if any). */
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                        xSemaphoreGiveFromISR( xTxFIFOSemaphore, &xHigherPriorityTaskWoken );
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                        lTaskWaiting = pdFALSE;
296
                }
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298
                UART1->ICR = mainTXRIS;
299
        }
300
 
301
        /* If a task was woken by either a character being received or a character
302
        being transmitted then we may need to switch to another task. */
303
        portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
304
}
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