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[freertos] / Demo / CORTUS_APS3_GCC / Demo / 7seg.c
1 /*\r
2     FreeRTOS V6.0.4 - Copyright (C) 2010 Real Time Engineers Ltd.\r
3 \r
4     ***************************************************************************\r
5     *                                                                         *\r
6     * If you are:                                                             *\r
7     *                                                                         *\r
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10     *    + Looking for basic training,                                        *\r
11     *    + Wanting to improve your FreeRTOS skills and productivity           *\r
12     *                                                                         *\r
13     * then take a look at the FreeRTOS eBook                                  *\r
14     *                                                                         *\r
15     *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *\r
16     *                  http://www.FreeRTOS.org/Documentation                  *\r
17     *                                                                         *\r
18     * A pdf reference manual is also available.  Both are usually delivered   *\r
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20     * and 8pm GMT (although please allow up to 24 hours in case of            *\r
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22     *                                                                         *\r
23     ***************************************************************************\r
24 \r
25     This file is part of the FreeRTOS distribution.\r
26 \r
27     FreeRTOS is free software; you can redistribute it and/or modify it under\r
28     the terms of the GNU General Public License (version 2) as published by the\r
29     Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
30     ***NOTE*** The exception to the GPL is included to allow you to distribute\r
31     a combined work that includes FreeRTOS without being obliged to provide the\r
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33     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT\r
34     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\r
35     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for\r
36     more details. You should have received a copy of the GNU General Public\r
37     License and the FreeRTOS license exception along with FreeRTOS; if not it\r
38     can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
39     by writing to Richard Barry, contact details for whom are available on the\r
40     FreeRTOS WEB site.\r
41 \r
42     1 tab == 4 spaces!\r
43 \r
44     http://www.FreeRTOS.org - Documentation, latest information, license and\r
45     contact details.\r
46 \r
47     http://www.SafeRTOS.com - A version that is certified for use in safety\r
48     critical systems.\r
49 \r
50     http://www.OpenRTOS.com - Commercial support, development, porting,\r
51     licensing and training services.\r
52 */\r
53 \r
54 \r
55 #include <stdlib.h>\r
56 \r
57 /* Scheduler include files. */\r
58 #include "FreeRTOS.h"\r
59 #include "task.h"\r
60 \r
61 /* Demo program include files. */\r
62 #include "7seg.h"\r
63 #include "demoGpio.h"\r
64 \r
65 #define x7segSTACK_SIZE                 configMINIMAL_STACK_SIZE\r
66 \r
67 static void prvRefreshTask( void *pvParameters );\r
68 static void prvCountTask( void *pvParameters );\r
69 \r
70 /* Value to output to 7 segment display\r
71 led_digits[0] is the right most digit */\r
72 static signed char seg7_digits[4];\r
73 \r
74 void vStart7SegTasks( unsigned portBASE_TYPE uxPriority )\r
75 {\r
76         xTaskCreate( prvRefreshTask, ( signed char * ) "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL );\r
77         xTaskCreate( prvCountTask,   ( signed char * ) "7SegCount",     x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL );\r
78 }\r
79 /*-----------------------------------------------------------*/\r
80 \r
81 static void prvRefreshTask( void *pvParameters )\r
82 {\r
83 /* This is table 3.3 from the Spartan-3 Starter Kit board user guide */\r
84 const unsigned char bits[ 16 ] =\r
85 {\r
86         0x01,\r
87         0x4f,\r
88         0x12,\r
89         0x06,\r
90         0x4c,\r
91         0x24,\r
92         0x20,\r
93         0x0f,\r
94         0x00,\r
95         0x04,\r
96         0x08,\r
97         0x60,\r
98         0x31,\r
99         0x42,\r
100         0x30,\r
101         0x38\r
102 };\r
103 \r
104 const unsigned char apsx[4] =\r
105 {\r
106         0x06, /* 3 */\r
107         0x24, /* S */\r
108         0x18, /* P */\r
109         0x08  /* A */\r
110 };\r
111 \r
112 portTickType xRefreshRate, xLastRefreshTime;\r
113 \r
114 /* Digit to scan */\r
115 static int d = 0;\r
116 \r
117         xRefreshRate = 2;\r
118 \r
119         /* We need to initialise xLastRefreshTime prior to the first call to\r
120         vTaskDelayUntil(). */\r
121         xLastRefreshTime = xTaskGetTickCount();\r
122 \r
123         for (;;)\r
124         {\r
125                 for( d = 0; d < 4; d++ )\r
126                 {\r
127                         vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate );\r
128 \r
129                         /* Display digit */\r
130                         gpio->out.an  = -1;\r
131                         if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) )\r
132                         {\r
133                                 gpio->out.digit = apsx[ d ];\r
134                         }\r
135                         else\r
136                         {\r
137                                 gpio->out.digit = bits[ seg7_digits[ d ] ];\r
138                         }\r
139 \r
140                         gpio->out.dp = 1;\r
141                         gpio->out.an  = ~(1 << d);\r
142                 }\r
143         }\r
144 }\r
145 /*-----------------------------------------------------------*/\r
146 \r
147 static void prvCountTask( void *pvParameters )\r
148 {\r
149 portTickType xCountRate, xLastCountTime;\r
150 \r
151         /* Approximately 20HZ */\r
152         xCountRate = configTICK_RATE_HZ / 20;\r
153 \r
154         /* We need to initialise xLastCountTime prior to the first call to\r
155         vTaskDelayUntil(). */\r
156         xLastCountTime = xTaskGetTickCount();\r
157 \r
158         for (;;)\r
159         {\r
160                 vTaskDelayUntil( &xLastCountTime, xCountRate );\r
161 \r
162                 /* Really ugly way to do BCD arithmetic.... */\r
163                 seg7_digits[ 0 ] -= 1;\r
164                 if( seg7_digits[ 0 ] < 0 )\r
165                 {\r
166                         seg7_digits[ 0 ] = 9;\r
167                         seg7_digits[ 1 ] -= 1;\r
168                         if( seg7_digits[ 1 ] < 0 )\r
169                         {\r
170                                 seg7_digits[ 1 ] = 9;\r
171                                 seg7_digits[ 2 ] -= 1;\r
172                                 if( seg7_digits[ 2 ] < 0 )\r
173                                 {\r
174                                         seg7_digits[ 2 ] = 9;\r
175                                         seg7_digits[ 3 ] -= 1;\r
176                                         if( seg7_digits[ 3 ] < 0 )\r
177                                         {\r
178                                                 seg7_digits[ 3 ] = 9;\r
179                                         }\r
180                                 }\r
181                         }\r
182                 }\r
183         }\r
184 }\r
185 \r
186 \r