/* | |
FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd. | |
FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT | |
http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
*************************************************************************** | |
* * | |
* 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 Real Time Engineers Ltd., 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, books, training, latest versions, | |
license and Real Time Engineers Ltd. contact details. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, and our new | |
fully thread aware and reentrant UDP/IP stack. | |
http://www.OpenRTOS.com - 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.SafeRTOS.com - High Integrity Systems also provide a safety | |
engineered and independently SIL3 certified version for use in safety and | |
mission critical applications that require provable dependability. | |
*/ | |
#include <stdlib.h> | |
/* Scheduler include files. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
/* Demo program include files. */ | |
#include "7seg.h" | |
#include "demoGpio.h" | |
#define x7segSTACK_SIZE configMINIMAL_STACK_SIZE | |
static void prvRefreshTask( void *pvParameters ); | |
static void prvCountTask( void *pvParameters ); | |
/* Value to output to 7 segment display | |
led_digits[0] is the right most digit */ | |
static signed char seg7_digits[4]; | |
void vStart7SegTasks( unsigned portBASE_TYPE uxPriority ) | |
{ | |
xTaskCreate( prvRefreshTask, ( signed char * ) "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL ); | |
xTaskCreate( prvCountTask, ( signed char * ) "7SegCount", x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvRefreshTask( void *pvParameters ) | |
{ | |
/* This is table 3.3 from the Spartan-3 Starter Kit board user guide */ | |
const unsigned char bits[ 16 ] = | |
{ | |
0x01, | |
0x4f, | |
0x12, | |
0x06, | |
0x4c, | |
0x24, | |
0x20, | |
0x0f, | |
0x00, | |
0x04, | |
0x08, | |
0x60, | |
0x31, | |
0x42, | |
0x30, | |
0x38 | |
}; | |
const unsigned char apsx[4] = | |
{ | |
0x06, /* 3 */ | |
0x24, /* S */ | |
0x18, /* P */ | |
0x08 /* A */ | |
}; | |
portTickType xRefreshRate, xLastRefreshTime; | |
/* Digit to scan */ | |
static int d = 0; | |
xRefreshRate = 2; | |
/* We need to initialise xLastRefreshTime prior to the first call to | |
vTaskDelayUntil(). */ | |
xLastRefreshTime = xTaskGetTickCount(); | |
for (;;) | |
{ | |
for( d = 0; d < 4; d++ ) | |
{ | |
vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate ); | |
/* Display digit */ | |
gpio->out.an = -1; | |
if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) ) | |
{ | |
gpio->out.digit = apsx[ d ]; | |
} | |
else | |
{ | |
gpio->out.digit = bits[ seg7_digits[ d ] ]; | |
} | |
gpio->out.dp = 1; | |
gpio->out.an = ~(1 << d); | |
} | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvCountTask( void *pvParameters ) | |
{ | |
portTickType xCountRate, xLastCountTime; | |
/* Approximately 20HZ */ | |
xCountRate = configTICK_RATE_HZ / 20; | |
/* We need to initialise xLastCountTime prior to the first call to | |
vTaskDelayUntil(). */ | |
xLastCountTime = xTaskGetTickCount(); | |
for (;;) | |
{ | |
vTaskDelayUntil( &xLastCountTime, xCountRate ); | |
/* Really ugly way to do BCD arithmetic.... */ | |
seg7_digits[ 0 ] -= 1; | |
if( seg7_digits[ 0 ] < 0 ) | |
{ | |
seg7_digits[ 0 ] = 9; | |
seg7_digits[ 1 ] -= 1; | |
if( seg7_digits[ 1 ] < 0 ) | |
{ | |
seg7_digits[ 1 ] = 9; | |
seg7_digits[ 2 ] -= 1; | |
if( seg7_digits[ 2 ] < 0 ) | |
{ | |
seg7_digits[ 2 ] = 9; | |
seg7_digits[ 3 ] -= 1; | |
if( seg7_digits[ 3 ] < 0 ) | |
{ | |
seg7_digits[ 3 ] = 9; | |
} | |
} | |
} | |
} | |
} | |
} | |