mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-05-31 17:39:03 -04:00
161 lines
4 KiB
C
161 lines
4 KiB
C
/*
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* FreeRTOS Kernel V10.1.0
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* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* Demo program include files. */
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#include "7seg.h"
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#include "demoGpio.h"
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#define x7segSTACK_SIZE configMINIMAL_STACK_SIZE
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static void prvRefreshTask( void *pvParameters );
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static void prvCountTask( void *pvParameters );
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/* Value to output to 7 segment display
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led_digits[0] is the right most digit */
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static signed char seg7_digits[4];
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void vStart7SegTasks( unsigned portBASE_TYPE uxPriority )
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{
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xTaskCreate( prvRefreshTask, "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL );
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xTaskCreate( prvCountTask, "7SegCount", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL );
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}
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/*-----------------------------------------------------------*/
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static void prvRefreshTask( void *pvParameters )
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{
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/* This is table 3.3 from the Spartan-3 Starter Kit board user guide */
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const unsigned char bits[ 16 ] =
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{
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0x01,
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0x4f,
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0x12,
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0x06,
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0x4c,
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0x24,
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0x20,
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0x0f,
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0x00,
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0x04,
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0x08,
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0x60,
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0x31,
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0x42,
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0x30,
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0x38
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};
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const unsigned char apsx[4] =
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{
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0x06, /* 3 */
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0x24, /* S */
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0x18, /* P */
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0x08 /* A */
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};
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TickType_t xRefreshRate, xLastRefreshTime;
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/* Digit to scan */
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static int d = 0;
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xRefreshRate = 2;
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/* We need to initialise xLastRefreshTime prior to the first call to
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vTaskDelayUntil(). */
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xLastRefreshTime = xTaskGetTickCount();
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for (;;)
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{
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for( d = 0; d < 4; d++ )
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{
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vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate );
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/* Display digit */
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gpio->out.an = -1;
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if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) )
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{
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gpio->out.digit = apsx[ d ];
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}
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else
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{
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gpio->out.digit = bits[ seg7_digits[ d ] ];
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}
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gpio->out.dp = 1;
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gpio->out.an = ~(1 << d);
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}
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}
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}
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/*-----------------------------------------------------------*/
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static void prvCountTask( void *pvParameters )
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{
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TickType_t xCountRate, xLastCountTime;
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/* Approximately 20HZ */
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xCountRate = configTICK_RATE_HZ / 20;
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/* We need to initialise xLastCountTime prior to the first call to
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vTaskDelayUntil(). */
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xLastCountTime = xTaskGetTickCount();
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for (;;)
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{
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vTaskDelayUntil( &xLastCountTime, xCountRate );
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/* Really ugly way to do BCD arithmetic.... */
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seg7_digits[ 0 ] -= 1;
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if( seg7_digits[ 0 ] < 0 )
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{
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seg7_digits[ 0 ] = 9;
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seg7_digits[ 1 ] -= 1;
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if( seg7_digits[ 1 ] < 0 )
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{
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seg7_digits[ 1 ] = 9;
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seg7_digits[ 2 ] -= 1;
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if( seg7_digits[ 2 ] < 0 )
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{
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seg7_digits[ 2 ] = 9;
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seg7_digits[ 3 ] -= 1;
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if( seg7_digits[ 3 ] < 0 )
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{
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seg7_digits[ 3 ] = 9;
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}
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}
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}
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}
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}
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}
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