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Update to V4.3.0 as described in http://www.FreeRTOS.org/History.txt
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Richard Barry
parent
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commit
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352 changed files with 71690 additions and 71398 deletions
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Demo/PIC24_MPLAB/lcd.c
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Demo/PIC24_MPLAB/lcd.c
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/*
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FreeRTOS.org V4.3.0 - Copyright (C) 2003-2007 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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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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Also see http://www.SafeRTOS.com for an IEC 61508 compliant version along
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with commercial development and support options.
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***************************************************************************
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*/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "queue.h"
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/* Demo includes. */
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#include "lcd.h"
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/*
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* The LCD is written to by more than one task so is controlled by this
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* 'gatekeeper' task. This is the only task that is actually permitted to
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* access the LCD directly. Other tasks wanting to display a message send
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* the message to the gatekeeper.
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*/
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static void vLCDTask( void *pvParameters );
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/*
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* Setup the peripherals required to communicate with the LCD.
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*/
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static void prvSetupLCD( void );
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/*
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* Move to the first (0) or second (1) row of the LCD.
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*/
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static void prvLCDGotoRow( unsigned portSHORT usRow );
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/*
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* Write a string of text to the LCD.
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*/
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static void prvLCDPutString( portCHAR *pcString );
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/*
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* Clear the LCD.
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*/
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static void prvLCDClear( void );
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/*-----------------------------------------------------------*/
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/* Brief delay to permit the LCD to catch up with commands. */
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#define lcdSHORT_DELAY 3
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/* SFR that seems to be missing from the standard header files. */
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#define PMAEN *( ( unsigned short * ) 0x60c )
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/* LCD commands. */
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#define lcdDEFAULT_FUNCTION 0x3c
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#define lcdDISPLAY_CONTROL 0x0c
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#define lcdCLEAR_DISPLAY 0x01
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#define lcdENTRY_MODE 0x06
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/* The length of the queue used to send messages to the LCD gatekeeper task. */
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#define lcdQUEUE_SIZE 3
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/*-----------------------------------------------------------*/
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/* The queue used to send messages to the LCD task. */
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xQueueHandle xLCDQueue;
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/*-----------------------------------------------------------*/
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xQueueHandle xStartLCDTask( void )
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{
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/* Create the queue used by the LCD task. Messages for display on the LCD
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are received via this queue. */
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xLCDQueue = xQueueCreate( lcdQUEUE_SIZE, sizeof( xLCDMessage ) );
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/* Start the task that will write to the LCD. The LCD hardware is
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initialised from within the task itself so delays can be used. */
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xTaskCreate( vLCDTask, ( signed portCHAR * ) "LCD", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 1, NULL );
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return xLCDQueue;
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}
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/*-----------------------------------------------------------*/
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static void prvLCDGotoRow( unsigned portSHORT usRow )
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{
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if( usRow == 0 )
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{
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PMADDR = 0x0000;
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PMDIN1 = 0x02;
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}
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else
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{
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PMADDR = 0x0000;
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PMDIN1 = 0xc0;
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}
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vTaskDelay( lcdSHORT_DELAY );
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}
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/*-----------------------------------------------------------*/
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static void prvLCDPutString( portCHAR *pcString )
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{
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/* Write out each character with appropriate delay between each. */
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while( *pcString )
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{
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PMADDR = 0x0001;
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PMDIN1 = *pcString;
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pcString++;
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vTaskDelay( lcdSHORT_DELAY );
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}
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}
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/*-----------------------------------------------------------*/
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static void prvLCDClear( void )
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{
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/* Clear the display. */
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PMADDR = 0x0000;
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PMDIN1 = lcdCLEAR_DISPLAY;
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vTaskDelay( lcdSHORT_DELAY );
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}
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/*-----------------------------------------------------------*/
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static void prvSetupLCD( void )
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{
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/* Setup the PMP. */
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PMCON = 0x83BF;
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PMMODE = 0x3FF;
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PMAEN = 1;
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PMADDR = 0x0000;
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vTaskDelay( lcdSHORT_DELAY );
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/* Set the default function. */
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PMDIN1 = lcdDEFAULT_FUNCTION;
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vTaskDelay( lcdSHORT_DELAY );
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/* Set the display control. */
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PMDIN1 = lcdDISPLAY_CONTROL;
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vTaskDelay( lcdSHORT_DELAY );
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/* Clear the display. */
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PMDIN1 = lcdCLEAR_DISPLAY;
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vTaskDelay( lcdSHORT_DELAY );
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/* Set the entry mode. */
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PMDIN1 = lcdENTRY_MODE;
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vTaskDelay( lcdSHORT_DELAY );
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}
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/*-----------------------------------------------------------*/
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static void vLCDTask( void *pvParameters )
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{
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xLCDMessage xMessage;
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unsigned portSHORT usRow = 0;
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/* Initialise the hardware. This uses delays so must not be called prior
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to the scheduler being started. */
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prvSetupLCD();
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/* Welcome message. */
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prvLCDPutString( "www.FreeRTOS.org" );
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for( ;; )
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{
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/* Wait for a message to arrive that requires displaying. */
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while( xQueueReceive( xLCDQueue, &xMessage, portMAX_DELAY ) != pdPASS );
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/* Clear the current display value. */
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prvLCDClear();
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/* Switch rows each time so we can see that the display is still being
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updated. */
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prvLCDGotoRow( usRow & 0x01 );
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usRow++;
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prvLCDPutString( xMessage.pcMessage );
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/* Delay the requested amount of time to ensure the text just written
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to the LCD is not overwritten. */
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vTaskDelay( xMessage.xMinDisplayTime );
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}
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}
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