2 FreeRTOS V8.0.0 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to distribute
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28 >>! a combined work that includes FreeRTOS without being obliged to provide
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29 >>! the source code for proprietary components outside of the FreeRTOS
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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69 /* Scheduler include files. */
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70 #include "FreeRTOS.h"
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73 /* Demo program include files. */
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75 #include "demoGpio.h"
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77 #define x7segSTACK_SIZE configMINIMAL_STACK_SIZE
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79 static void prvRefreshTask( void *pvParameters );
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80 static void prvCountTask( void *pvParameters );
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82 /* Value to output to 7 segment display
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83 led_digits[0] is the right most digit */
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84 static signed char seg7_digits[4];
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86 void vStart7SegTasks( unsigned portBASE_TYPE uxPriority )
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88 xTaskCreate( prvRefreshTask, "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL );
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89 xTaskCreate( prvCountTask, "7SegCount", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL );
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91 /*-----------------------------------------------------------*/
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93 static void prvRefreshTask( void *pvParameters )
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95 /* This is table 3.3 from the Spartan-3 Starter Kit board user guide */
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96 const unsigned char bits[ 16 ] =
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116 const unsigned char apsx[4] =
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124 TickType_t xRefreshRate, xLastRefreshTime;
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126 /* Digit to scan */
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131 /* We need to initialise xLastRefreshTime prior to the first call to
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132 vTaskDelayUntil(). */
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133 xLastRefreshTime = xTaskGetTickCount();
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137 for( d = 0; d < 4; d++ )
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139 vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate );
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141 /* Display digit */
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143 if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) )
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145 gpio->out.digit = apsx[ d ];
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149 gpio->out.digit = bits[ seg7_digits[ d ] ];
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153 gpio->out.an = ~(1 << d);
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157 /*-----------------------------------------------------------*/
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159 static void prvCountTask( void *pvParameters )
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161 TickType_t xCountRate, xLastCountTime;
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163 /* Approximately 20HZ */
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164 xCountRate = configTICK_RATE_HZ / 20;
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166 /* We need to initialise xLastCountTime prior to the first call to
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167 vTaskDelayUntil(). */
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168 xLastCountTime = xTaskGetTickCount();
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172 vTaskDelayUntil( &xLastCountTime, xCountRate );
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174 /* Really ugly way to do BCD arithmetic.... */
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175 seg7_digits[ 0 ] -= 1;
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176 if( seg7_digits[ 0 ] < 0 )
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178 seg7_digits[ 0 ] = 9;
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179 seg7_digits[ 1 ] -= 1;
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180 if( seg7_digits[ 1 ] < 0 )
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182 seg7_digits[ 1 ] = 9;
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183 seg7_digits[ 2 ] -= 1;
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184 if( seg7_digits[ 2 ] < 0 )
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186 seg7_digits[ 2 ] = 9;
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187 seg7_digits[ 3 ] -= 1;
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188 if( seg7_digits[ 3 ] < 0 )
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190 seg7_digits[ 3 ] = 9;
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