2 FreeRTOS V6.0.4 - Copyright (C) 2010 Real Time Engineers Ltd.
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4 ***************************************************************************
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8 * + New to FreeRTOS, *
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9 * + Wanting to learn FreeRTOS or multitasking in general quickly *
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10 * + Looking for basic training, *
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11 * + Wanting to improve your FreeRTOS skills and productivity *
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13 * then take a look at the FreeRTOS eBook *
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15 * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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16 * http://www.FreeRTOS.org/Documentation *
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18 * A pdf reference manual is also available. Both are usually delivered *
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19 * to your inbox within 20 minutes to two hours when purchased between 8am *
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20 * and 8pm GMT (although please allow up to 24 hours in case of *
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21 * exceptional circumstances). Thank you for your support! *
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23 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 ***NOTE*** The exception to the GPL is included to allow you to distribute
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31 a combined work that includes FreeRTOS without being obliged to provide the
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32 source code for proprietary components outside of the FreeRTOS kernel.
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33 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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34 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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35 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 http://www.FreeRTOS.org - Documentation, latest information, license and
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47 http://www.SafeRTOS.com - A version that is certified for use in safety
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50 http://www.OpenRTOS.com - Commercial support, development, porting,
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51 licensing and training services.
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57 /* Scheduler include files. */
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58 #include "FreeRTOS.h"
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61 /* Demo program include files. */
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63 #include "demoGpio.h"
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65 #define x7segSTACK_SIZE configMINIMAL_STACK_SIZE
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67 static void prvRefreshTask( void *pvParameters );
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68 static void prvCountTask( void *pvParameters );
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70 /* Value to output to 7 segment display
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71 led_digits[0] is the right most digit */
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72 static signed char seg7_digits[4];
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74 void vStart7SegTasks( unsigned portBASE_TYPE uxPriority )
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76 xTaskCreate( prvRefreshTask, ( signed char * ) "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL );
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77 xTaskCreate( prvCountTask, ( signed char * ) "7SegCount", x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL );
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79 /*-----------------------------------------------------------*/
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81 static void prvRefreshTask( void *pvParameters )
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83 /* This is table 3.3 from the Spartan-3 Starter Kit board user guide */
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84 const unsigned char bits[ 16 ] =
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104 const unsigned char apsx[4] =
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112 portTickType xRefreshRate, xLastRefreshTime;
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114 /* Digit to scan */
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119 /* We need to initialise xLastRefreshTime prior to the first call to
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120 vTaskDelayUntil(). */
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121 xLastRefreshTime = xTaskGetTickCount();
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125 for( d = 0; d < 4; d++ )
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127 vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate );
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129 /* Display digit */
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131 if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) )
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133 gpio->out.digit = apsx[ d ];
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137 gpio->out.digit = bits[ seg7_digits[ d ] ];
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141 gpio->out.an = ~(1 << d);
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145 /*-----------------------------------------------------------*/
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147 static void prvCountTask( void *pvParameters )
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149 portTickType xCountRate, xLastCountTime;
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151 /* Approximately 20HZ */
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152 xCountRate = configTICK_RATE_HZ / 20;
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154 /* We need to initialise xLastCountTime prior to the first call to
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155 vTaskDelayUntil(). */
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156 xLastCountTime = xTaskGetTickCount();
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160 vTaskDelayUntil( &xLastCountTime, xCountRate );
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162 /* Really ugly way to do BCD arithmetic.... */
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163 seg7_digits[ 0 ] -= 1;
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164 if( seg7_digits[ 0 ] < 0 )
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166 seg7_digits[ 0 ] = 9;
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167 seg7_digits[ 1 ] -= 1;
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168 if( seg7_digits[ 1 ] < 0 )
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170 seg7_digits[ 1 ] = 9;
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171 seg7_digits[ 2 ] -= 1;
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172 if( seg7_digits[ 2 ] < 0 )
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174 seg7_digits[ 2 ] = 9;
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175 seg7_digits[ 3 ] -= 1;
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176 if( seg7_digits[ 3 ] < 0 )
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178 seg7_digits[ 3 ] = 9;
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