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Richard Barry
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20100923-V6.1.0-RC2/Demo/PIC32MX_MPLAB/lcd.c
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20100923-V6.1.0-RC2/Demo/PIC32MX_MPLAB/lcd.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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/* peripheral library include */
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#include <plib.h>
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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 lcdVERY_SHORT_DELAY ( 1 )
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#define lcdSHORT_DELAY ( 4 / portTICK_RATE_MS )
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#define lcdLONG_DELAY ( 15 / portTICK_RATE_MS )
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/* LCD specific definitions. */
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#define LCD_CLEAR_DISPLAY_CMD 0x01
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#define LCD_CURSOR_HOME_CMD 0x02
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#define LCD_ENTRY_MODE_CMD 0x04
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#define LCD_ENTRY_MODE_INCREASE 0x02
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#define LCD_DISPLAY_CTRL_CMD 0x08
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#define LCD_DISPLAY_CTRL_DISPLAY_ON 0x04
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#define LCD_FUNCTION_SET_CMD 0x20
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#define LCD_FUNCTION_SET_8_BITS 0x10
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#define LCD_FUNCTION_SET_2_LINES 0x08
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#define LCD_FUNCTION_SET_LRG_FONT 0x04
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#define LCD_NEW_LINE 0xC0
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#define LCD_COMMAND_ADDRESS 0x00
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#define LCD_DATA_ADDRESS 0x01
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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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/* LCD access functions. */
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static void prvLCDCommand( portCHAR cCommand );
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static void prvLCDData( portCHAR cChar );
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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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prvLCDCommand( LCD_CURSOR_HOME_CMD );
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}
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else
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{
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prvLCDCommand( LCD_NEW_LINE );
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}
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}
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/*-----------------------------------------------------------*/
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static void prvLCDCommand( portCHAR cCommand )
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{
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PMPSetAddress( LCD_COMMAND_ADDRESS );
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PMPMasterWrite( cCommand );
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vTaskDelay( lcdSHORT_DELAY );
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}
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/*-----------------------------------------------------------*/
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static void prvLCDData( portCHAR cChar )
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{
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PMPSetAddress( LCD_DATA_ADDRESS );
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PMPMasterWrite( cChar );
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vTaskDelay( lcdVERY_SHORT_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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prvLCDData(*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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prvLCDCommand(LCD_CLEAR_DISPLAY_CMD);
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}
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/*-----------------------------------------------------------*/
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static void prvSetupLCD(void)
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{
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/* Wait for proper power up. */
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vTaskDelay( lcdLONG_DELAY );
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/* Open the PMP port */
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mPMPOpen((PMP_ON | PMP_READ_WRITE_EN | PMP_CS2_CS1_EN |
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PMP_LATCH_POL_HI | PMP_CS2_POL_HI | PMP_CS1_POL_HI |
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PMP_WRITE_POL_HI | PMP_READ_POL_HI),
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(PMP_MODE_MASTER1 | PMP_WAIT_BEG_4 | PMP_WAIT_MID_15 |
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PMP_WAIT_END_4),
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PMP_PEN_0, 0);
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/* Wait for the LCD to power up correctly. */
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vTaskDelay( lcdLONG_DELAY );
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vTaskDelay( lcdLONG_DELAY );
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vTaskDelay( lcdLONG_DELAY );
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/* Set up the LCD function. */
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prvLCDCommand( LCD_FUNCTION_SET_CMD | LCD_FUNCTION_SET_8_BITS | LCD_FUNCTION_SET_2_LINES | LCD_FUNCTION_SET_LRG_FONT );
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/* Turn the display on. */
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prvLCDCommand( LCD_DISPLAY_CTRL_CMD | LCD_DISPLAY_CTRL_DISPLAY_ON );
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/* Clear the display. */
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prvLCDCommand( LCD_CLEAR_DISPLAY_CMD );
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vTaskDelay( lcdLONG_DELAY );
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/* Increase the cursor. */
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prvLCDCommand( LCD_ENTRY_MODE_CMD | LCD_ENTRY_MODE_INCREASE );
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vTaskDelay( lcdLONG_DELAY );
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vTaskDelay( lcdLONG_DELAY );
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vTaskDelay( lcdLONG_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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