/* | |
FreeRTOS V9.0.0rc2 - Copyright (C) 2016 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
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. Full license text is available on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
http://www.FreeRTOS.org/support - In return for receiving this top quality | |
embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
be as productive as possible as early as possible. Now you can receive | |
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
Ltd, and the world's leading authority on the world's leading RTOS. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. | |
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High | |
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and commercial middleware. | |
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. | |
1 tab == 4 spaces! | |
*/ | |
#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, "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL ); | |
xTaskCreate( prvCountTask, "7SegCount", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) 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 */ | |
}; | |
TickType_t 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 ) | |
{ | |
TickType_t 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; | |
} | |
} | |
} | |
} | |
} | |
} | |