git.sur5r.net Git - freertos/blob - FreeRTOS/Demo/CORTUS_APS3_GCC/Demo/7seg.c

   1 /*\r
   2     FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd.\r
   3     All rights reserved\r
   4 \r
   5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     This file is part of the FreeRTOS distribution.\r
   8 \r
   9     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  10     the terms of the GNU General Public License (version 2) as published by the\r
  11     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  12 \r
  13     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  14     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  15     >>!   obliged to provide the source code for proprietary components     !<<\r
  16     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  17 \r
  18     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  19     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  20     FOR A PARTICULAR PURPOSE.  Full license text is available on the following\r
  21     link: http://www.freertos.org/a00114.html\r
  22 \r
  23     1 tab == 4 spaces!\r
  24 \r
  25     ***************************************************************************\r
  26      *                                                                       *\r
  27      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  28      *    not run, what could be wrong?".  Have you defined configASSERT()?  *\r
  29      *                                                                       *\r
  30      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  31      *                                                                       *\r
  32     ***************************************************************************\r
  33 \r
  34     ***************************************************************************\r
  35      *                                                                       *\r
  36      *    FreeRTOS provides completely free yet professionally developed,    *\r
  37      *    robust, strictly quality controlled, supported, and cross          *\r
  38      *    platform software that is more than just the market leader, it     *\r
  39      *    is the industry's de facto standard.                               *\r
  40      *                                                                       *\r
  41      *    Help yourself get started quickly while simultaneously helping     *\r
  42      *    to support the FreeRTOS project by purchasing a FreeRTOS           *\r
  43      *    tutorial book, reference manual, or both:                          *\r
  44      *    http://www.FreeRTOS.org/Documentation                              *\r
  45      *                                                                       *\r
  46     ***************************************************************************\r
  47 \r
  48     ***************************************************************************\r
  49      *                                                                       *\r
  50      *   Investing in training allows your team to be as productive as       *\r
  51      *   possible as early as possible, lowering your overall development    *\r
  52      *   cost, and enabling you to bring a more robust product to market     *\r
  53      *   earlier than would otherwise be possible.  Richard Barry is both    *\r
  54      *   the architect and key author of FreeRTOS, and so also the world's   *\r
  55      *   leading authority on what is the world's most popular real time     *\r
  56      *   kernel for deeply embedded MCU designs.  Obtaining your training    *\r
  57      *   from Richard ensures your team will gain directly from his in-depth *\r
  58      *   product knowledge and years of usage experience.  Contact Real Time *\r
  59      *   Engineers Ltd to enquire about the FreeRTOS Masterclass, presented  *\r
  60      *   by Richard Barry:  http://www.FreeRTOS.org/contact\r
  61      *                                                                       *\r
  62     ***************************************************************************\r
  63 \r
  64     ***************************************************************************\r
  65      *                                                                       *\r
  66      *    You are receiving this top quality software for free.  Please play *\r
  67      *    fair and reciprocate by reporting any suspected issues and         *\r
  68      *    participating in the community forum:                              *\r
  69      *    http://www.FreeRTOS.org/support                                    *\r
  70      *                                                                       *\r
  71      *    Thank you!                                                         *\r
  72      *                                                                       *\r
  73     ***************************************************************************\r
  74 \r
  75     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  76     license and Real Time Engineers Ltd. contact details.\r
  77 \r
  78     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  79     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  80     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  81 \r
  82     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.\r
  83     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.\r
  84 \r
  85     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  86     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  87     licenses offer ticketed support, indemnification and commercial middleware.\r
  88 \r
  89     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  90     engineered and independently SIL3 certified version for use in safety and\r
  91     mission critical applications that require provable dependability.\r
  92 \r
  93     1 tab == 4 spaces!\r
  94 */\r
  95 \r
  96 \r
  97 #include <stdlib.h>\r
  98 \r
  99 /* Scheduler include files. */\r
 100 #include "FreeRTOS.h"\r
 101 #include "task.h"\r
 102 \r
 103 /* Demo program include files. */\r
 104 #include "7seg.h"\r
 105 #include "demoGpio.h"\r
 106 \r
 107 #define x7segSTACK_SIZE                 configMINIMAL_STACK_SIZE\r
 108 \r
 109 static void prvRefreshTask( void *pvParameters );\r
 110 static void prvCountTask( void *pvParameters );\r
 111 \r
 112 /* Value to output to 7 segment display\r
 113 led_digits[0] is the right most digit */\r
 114 static signed char seg7_digits[4];\r
 115 \r
 116 void vStart7SegTasks( unsigned portBASE_TYPE uxPriority )\r
 117 {\r
 118         xTaskCreate( prvRefreshTask, "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL );\r
 119         xTaskCreate( prvCountTask, "7SegCount", x7segSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t *) NULL );\r
 120 }\r
 121 /*-----------------------------------------------------------*/\r
 122 \r
 123 static void prvRefreshTask( void *pvParameters )\r
 124 {\r
 125 /* This is table 3.3 from the Spartan-3 Starter Kit board user guide */\r
 126 const unsigned char bits[ 16 ] =\r
 127 {\r
 128         0x01,\r
 129         0x4f,\r
 130         0x12,\r
 131         0x06,\r
 132         0x4c,\r
 133         0x24,\r
 134         0x20,\r
 135         0x0f,\r
 136         0x00,\r
 137         0x04,\r
 138         0x08,\r
 139         0x60,\r
 140         0x31,\r
 141         0x42,\r
 142         0x30,\r
 143         0x38\r
 144 };\r
 145 \r
 146 const unsigned char apsx[4] =\r
 147 {\r
 148         0x06, /* 3 */\r
 149         0x24, /* S */\r
 150         0x18, /* P */\r
 151         0x08  /* A */\r
 152 };\r
 153 \r
 154 TickType_t xRefreshRate, xLastRefreshTime;\r
 155 \r
 156 /* Digit to scan */\r
 157 static int d = 0;\r
 158 \r
 159         xRefreshRate = 2;\r
 160 \r
 161         /* We need to initialise xLastRefreshTime prior to the first call to\r
 162         vTaskDelayUntil(). */\r
 163         xLastRefreshTime = xTaskGetTickCount();\r
 164 \r
 165         for (;;)\r
 166         {\r
 167                 for( d = 0; d < 4; d++ )\r
 168                 {\r
 169                         vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate );\r
 170 \r
 171                         /* Display digit */\r
 172                         gpio->out.an  = -1;\r
 173                         if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) )\r
 174                         {\r
 175                                 gpio->out.digit = apsx[ d ];\r
 176                         }\r
 177                         else\r
 178                         {\r
 179                                 gpio->out.digit = bits[ seg7_digits[ d ] ];\r
 180                         }\r
 181 \r
 182                         gpio->out.dp = 1;\r
 183                         gpio->out.an  = ~(1 << d);\r
 184                 }\r
 185         }\r
 186 }\r
 187 /*-----------------------------------------------------------*/\r
 188 \r
 189 static void prvCountTask( void *pvParameters )\r
 190 {\r
 191 TickType_t xCountRate, xLastCountTime;\r
 192 \r
 193         /* Approximately 20HZ */\r
 194         xCountRate = configTICK_RATE_HZ / 20;\r
 195 \r
 196         /* We need to initialise xLastCountTime prior to the first call to\r
 197         vTaskDelayUntil(). */\r
 198         xLastCountTime = xTaskGetTickCount();\r
 199 \r
 200         for (;;)\r
 201         {\r
 202                 vTaskDelayUntil( &xLastCountTime, xCountRate );\r
 203 \r
 204                 /* Really ugly way to do BCD arithmetic.... */\r
 205                 seg7_digits[ 0 ] -= 1;\r
 206                 if( seg7_digits[ 0 ] < 0 )\r
 207                 {\r
 208                         seg7_digits[ 0 ] = 9;\r
 209                         seg7_digits[ 1 ] -= 1;\r
 210                         if( seg7_digits[ 1 ] < 0 )\r
 211                         {\r
 212                                 seg7_digits[ 1 ] = 9;\r
 213                                 seg7_digits[ 2 ] -= 1;\r
 214                                 if( seg7_digits[ 2 ] < 0 )\r
 215                                 {\r
 216                                         seg7_digits[ 2 ] = 9;\r
 217                                         seg7_digits[ 3 ] -= 1;\r
 218                                         if( seg7_digits[ 3 ] < 0 )\r
 219                                         {\r
 220                                                 seg7_digits[ 3 ] = 9;\r
 221                                         }\r
 222                                 }\r
 223                         }\r
 224                 }\r
 225         }\r
 226 }\r
 227 \r
 228 \r