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Richard Barry
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273
20080212/Demo/ARM7_LPC2106_GCC/serial/serial.c
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273
20080212/Demo/ARM7_LPC2106_GCC/serial/serial.c
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/*
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FreeRTOS.org V4.7.1 - Copyright (C) 2003-2008 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS.org, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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+++ http://www.FreeRTOS.org +++
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Documentation, latest information, license and contact details.
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+++ http://www.SafeRTOS.com +++
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A version that is certified for use in safety critical systems.
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+++ http://www.OpenRTOS.com +++
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Commercial support, development, porting, licensing and training services.
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***************************************************************************
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*/
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/*
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Changes from V2.4.0
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+ Made serial ISR handling more complete and robust.
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Changes from V2.4.1
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+ Split serial.c into serial.c and serialISR.c. serial.c can be
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compiled using ARM or THUMB modes. serialISR.c must always be
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compiled in ARM mode.
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+ Another small change to cSerialPutChar().
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Changed from V2.5.1
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+ In cSerialPutChar() an extra check is made to ensure the post to
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the queue was successful if then attempting to retrieve the posted
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character.
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*/
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/*
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BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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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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/*-----------------------------------------------------------*/
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/* Constants to setup and access the UART. */
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#define serDLAB ( ( unsigned portCHAR ) 0x80 )
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#define serENABLE_INTERRUPTS ( ( unsigned portCHAR ) 0x03 )
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#define serNO_PARITY ( ( unsigned portCHAR ) 0x00 )
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#define ser1_STOP_BIT ( ( unsigned portCHAR ) 0x00 )
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#define ser8_BIT_CHARS ( ( unsigned portCHAR ) 0x03 )
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#define serFIFO_ON ( ( unsigned portCHAR ) 0x01 )
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#define serCLEAR_FIFO ( ( unsigned portCHAR ) 0x06 )
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#define serWANTED_CLOCK_SCALING ( ( unsigned portLONG ) 16 )
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/* Constants to setup and access the VIC. */
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#define serUART0_VIC_CHANNEL ( ( unsigned portLONG ) 0x0006 )
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#define serUART0_VIC_CHANNEL_BIT ( ( unsigned portLONG ) 0x0040 )
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#define serUART0_VIC_ENABLE ( ( unsigned portLONG ) 0x0020 )
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#define serCLEAR_VIC_INTERRUPT ( ( unsigned portLONG ) 0 )
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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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/* Communication flag between the interrupt service routine and serial API. */
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static volatile portLONG *plTHREEmpty;
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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, portLONG volatile **pplTHREEmptyFlag );
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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unsigned portLONG ulDivisor, ulWantedClock;
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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, &plTHREEmpty );
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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 portLONG ) 0 )
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)
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{
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portENTER_CRITICAL();
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{
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/* Setup the baud rate: Calculate the divisor value. */
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ulWantedClock = ulWantedBaud * serWANTED_CLOCK_SCALING;
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ulDivisor = configCPU_CLOCK_HZ / ulWantedClock;
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/* Set the DLAB bit so we can access the divisor. */
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UART0_LCR |= serDLAB;
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/* Setup the divisor. */
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UART0_DLL = ( unsigned portCHAR ) ( ulDivisor & ( unsigned portLONG ) 0xff );
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ulDivisor >>= 8;
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UART0_DLM = ( unsigned portCHAR ) ( ulDivisor & ( unsigned portLONG ) 0xff );
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/* Turn on the FIFO's and clear the buffers. */
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UART0_FCR = ( serFIFO_ON | serCLEAR_FIFO );
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/* Setup transmission format. */
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UART0_LCR = serNO_PARITY | ser1_STOP_BIT | ser8_BIT_CHARS;
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/* Setup the VIC for the UART. */
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VICIntSelect &= ~( serUART0_VIC_CHANNEL_BIT );
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VICIntEnable |= serUART0_VIC_CHANNEL_BIT;
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VICVectAddr1 = ( portLONG ) vUART_ISR_Wrapper;
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VICVectCntl1 = serUART0_VIC_CHANNEL | serUART0_VIC_ENABLE;
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/* Enable UART0 interrupts. */
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UART0_IER |= serENABLE_INTERRUPTS;
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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 portCHAR *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 portCHAR * const pcString, unsigned portSHORT usStringLength )
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{
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signed portCHAR *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 portCHAR * ) 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 portCHAR cOutChar, portTickType xBlockTime )
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{
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signed portBASE_TYPE xReturn;
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/* This demo driver only supports one port so the parameter is not used. */
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( void ) pxPort;
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portENTER_CRITICAL();
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{
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/* Is there space to write directly to the UART? */
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if( *plTHREEmpty == ( portLONG ) pdTRUE )
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{
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/* We wrote the character directly to the UART, so was
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successful. */
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*plTHREEmpty = pdFALSE;
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UART0_THR = cOutChar;
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xReturn = pdPASS;
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}
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else
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{
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/* We cannot write directly to the UART, so queue the character.
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Block for a maximum of xBlockTime if there is no space in the
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queue. */
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xReturn = xQueueSend( xCharsForTx, &cOutChar, xBlockTime );
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/* Depending on queue sizing and task prioritisation: While we
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were blocked waiting to post interrupts were not disabled. It is
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possible that the serial ISR has emptied the Tx queue, in which
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case we need to start the Tx off again. */
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if( ( *plTHREEmpty == ( portLONG ) pdTRUE ) && ( xReturn == pdPASS ) )
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{
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xQueueReceive( xCharsForTx, &cOutChar, serNO_BLOCK );
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*plTHREEmpty = pdFALSE;
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UART0_THR = cOutChar;
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}
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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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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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