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Add FreeRTOS-Plus directory.

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Richard Barry 2012-08-11 21:34:11 +00:00
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commit f508a5f653
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FreeRTOS/Demo/PIC24_MPLAB/lcd.c Normal file
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/*
FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
***************************************************************************
* *
* FreeRTOS tutorial books are available in pdf and paperback. *
* Complete, revised, and edited pdf reference manuals are also *
* available. *
* *
* Purchasing FreeRTOS documentation will not only help you, by *
* ensuring you get running as quickly as possible and with an *
* in-depth knowledge of how to use FreeRTOS, it will also help *
* the FreeRTOS project to continue with its mission of providing *
* professional grade, cross platform, de facto standard solutions *
* for microcontrollers - completely free of charge! *
* *
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
* *
* Thank you for using FreeRTOS, and thank you for your support! *
* *
***************************************************************************
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
>>>NOTE<<< The modification to the GPL is included to allow you to
distribute a combined work that includes FreeRTOS without being obliged to
provide the source code for proprietary components outside of the FreeRTOS
kernel. FreeRTOS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details. You should have received a copy of the GNU General Public
License and the FreeRTOS license exception along with FreeRTOS; if not it
can be viewed here: http://www.freertos.org/a00114.html and also obtained
by writing to Richard Barry, contact details for whom are available on the
FreeRTOS WEB site.
1 tab == 4 spaces!
***************************************************************************
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong? *
* *
* http://www.FreeRTOS.org/FAQHelp.html *
* *
***************************************************************************
http://www.FreeRTOS.org - Documentation, training, latest information,
license and contact details.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool.
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
the code with commercial support, indemnification, and middleware, under
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand: http://www.SafeRTOS.com.
*/
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* Demo includes. */
#include "lcd.h"
/*
* The LCD is written to by more than one task so is controlled by this
* 'gatekeeper' task. This is the only task that is actually permitted to
* access the LCD directly. Other tasks wanting to display a message send
* the message to the gatekeeper.
*/
static void vLCDTask( void *pvParameters );
/*
* Setup the peripherals required to communicate with the LCD.
*/
static void prvSetupLCD( void );
/*
* Move to the first (0) or second (1) row of the LCD.
*/
static void prvLCDGotoRow( unsigned portSHORT usRow );
/*
* Write a string of text to the LCD.
*/
static void prvLCDPutString( portCHAR *pcString );
/*
* Clear the LCD.
*/
static void prvLCDClear( void );
/*-----------------------------------------------------------*/
/* Brief delay to permit the LCD to catch up with commands. */
#define lcdSHORT_DELAY 3
/* SFR that seems to be missing from the standard header files. */
#define PMAEN *( ( unsigned short * ) 0x60c )
/* LCD commands. */
#define lcdDEFAULT_FUNCTION 0x3c
#define lcdDISPLAY_CONTROL 0x0c
#define lcdCLEAR_DISPLAY 0x01
#define lcdENTRY_MODE 0x06
/* The length of the queue used to send messages to the LCD gatekeeper task. */
#define lcdQUEUE_SIZE 3
/*-----------------------------------------------------------*/
/* The queue used to send messages to the LCD task. */
xQueueHandle xLCDQueue;
/*-----------------------------------------------------------*/
xQueueHandle xStartLCDTask( void )
{
/* Create the queue used by the LCD task. Messages for display on the LCD
are received via this queue. */
xLCDQueue = xQueueCreate( lcdQUEUE_SIZE, sizeof( xLCDMessage ) );
/* Start the task that will write to the LCD. The LCD hardware is
initialised from within the task itself so delays can be used. */
xTaskCreate( vLCDTask, ( signed portCHAR * ) "LCD", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 1, NULL );
return xLCDQueue;
}
/*-----------------------------------------------------------*/
static void prvLCDGotoRow( unsigned portSHORT usRow )
{
if( usRow == 0 )
{
PMADDR = 0x0000;
PMDIN1 = 0x02;
}
else
{
PMADDR = 0x0000;
PMDIN1 = 0xc0;
}
vTaskDelay( lcdSHORT_DELAY );
}
/*-----------------------------------------------------------*/
static void prvLCDPutString( portCHAR *pcString )
{
/* Write out each character with appropriate delay between each. */
while( *pcString )
{
PMADDR = 0x0001;
PMDIN1 = *pcString;
pcString++;
vTaskDelay( lcdSHORT_DELAY );
}
}
/*-----------------------------------------------------------*/
static void prvLCDClear( void )
{
/* Clear the display. */
PMADDR = 0x0000;
PMDIN1 = lcdCLEAR_DISPLAY;
vTaskDelay( lcdSHORT_DELAY );
}
/*-----------------------------------------------------------*/
static void prvSetupLCD( void )
{
/* Setup the PMP. */
PMCON = 0x83BF;
PMMODE = 0x3FF;
PMAEN = 1;
PMADDR = 0x0000;
vTaskDelay( lcdSHORT_DELAY );
/* Set the default function. */
PMDIN1 = lcdDEFAULT_FUNCTION;
vTaskDelay( lcdSHORT_DELAY );
/* Set the display control. */
PMDIN1 = lcdDISPLAY_CONTROL;
vTaskDelay( lcdSHORT_DELAY );
/* Clear the display. */
PMDIN1 = lcdCLEAR_DISPLAY;
vTaskDelay( lcdSHORT_DELAY );
/* Set the entry mode. */
PMDIN1 = lcdENTRY_MODE;
vTaskDelay( lcdSHORT_DELAY );
}
/*-----------------------------------------------------------*/
static void vLCDTask( void *pvParameters )
{
xLCDMessage xMessage;
unsigned portSHORT usRow = 0;
/* Initialise the hardware. This uses delays so must not be called prior
to the scheduler being started. */
prvSetupLCD();
/* Welcome message. */
prvLCDPutString( "www.FreeRTOS.org" );
for( ;; )
{
/* Wait for a message to arrive that requires displaying. */
while( xQueueReceive( xLCDQueue, &xMessage, portMAX_DELAY ) != pdPASS );
/* Clear the current display value. */
prvLCDClear();
/* Switch rows each time so we can see that the display is still being
updated. */
prvLCDGotoRow( usRow & 0x01 );
usRow++;
prvLCDPutString( xMessage.pcMessage );
/* Delay the requested amount of time to ensure the text just written
to the LCD is not overwritten. */
vTaskDelay( xMessage.xMinDisplayTime );
}
}