blob: da9836c51e4f8ac49d4ef334fee660327e4232b2 [file] [log] [blame]
/*
* FreeRTOS Kernel V10.3.0
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 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;
}
}
}
}
}
}