git.sur5r.net Git - freertos/blob - Demo/AVR_ATMega323_WinAVR/ParTest/ParTest.c

   1 /*\r
   2     FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.\r
   3 \r
   4     ***************************************************************************\r
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  14     *                                                                         *\r
  15     *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *\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
  32     source code for proprietary components outside of the FreeRTOS kernel.\r
  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 Changes from V2.0.0\r
  56 \r
  57         + Use scheduler suspends in place of critical sections.\r
  58 \r
  59 Changes from V2.6.0\r
  60 \r
  61         + Replaced the inb() and outb() functions with direct memory\r
  62           access.  This allows the port to be built with the 20050414 build of\r
  63           WinAVR.\r
  64 */\r
  65 \r
  66 #include "FreeRTOS.h"\r
  67 #include "task.h"\r
  68 #include "partest.h"\r
  69 \r
  70 /*-----------------------------------------------------------\r
  71  * Simple parallel port IO routines.\r
  72  *-----------------------------------------------------------*/\r
  73 \r
  74 #define partstALL_BITS_OUTPUT                   ( ( unsigned char ) 0xff )\r
  75 #define partstALL_OUTPUTS_OFF                   ( ( unsigned char ) 0xff )\r
  76 #define partstMAX_OUTPUT_LED                    ( ( unsigned char ) 7 )\r
  77 \r
  78 static volatile unsigned char ucCurrentOutputValue = partstALL_OUTPUTS_OFF; /*lint !e956 File scope parameters okay here. */\r
  79 \r
  80 /*-----------------------------------------------------------*/\r
  81 \r
  82 void vParTestInitialise( void )\r
  83 {\r
  84         ucCurrentOutputValue = partstALL_OUTPUTS_OFF;\r
  85 \r
  86         /* Set port B direction to outputs.  Start with all output off. */\r
  87         DDRB = partstALL_BITS_OUTPUT;\r
  88         PORTB = ucCurrentOutputValue;\r
  89 }\r
  90 /*-----------------------------------------------------------*/\r
  91 \r
  92 void vParTestSetLED( unsigned portBASE_TYPE uxLED, signed portBASE_TYPE xValue )\r
  93 {\r
  94 unsigned char ucBit = ( unsigned char ) 1;\r
  95 \r
  96         if( uxLED <= partstMAX_OUTPUT_LED )\r
  97         {\r
  98                 ucBit <<= uxLED;        \r
  99 \r
 100                 vTaskSuspendAll();\r
 101                 {\r
 102                         if( xValue == pdTRUE )\r
 103                         {\r
 104                                 ucBit ^= ( unsigned char ) 0xff;\r
 105                                 ucCurrentOutputValue &= ucBit;\r
 106                         }\r
 107                         else\r
 108                         {\r
 109                                 ucCurrentOutputValue |= ucBit;\r
 110                         }\r
 111 \r
 112                         PORTB = ucCurrentOutputValue;\r
 113                 }\r
 114                 xTaskResumeAll();\r
 115         }\r
 116 }\r
 117 /*-----------------------------------------------------------*/\r
 118 \r
 119 void vParTestToggleLED( unsigned portBASE_TYPE uxLED )\r
 120 {\r
 121 unsigned char ucBit;\r
 122 \r
 123         if( uxLED <= partstMAX_OUTPUT_LED )\r
 124         {\r
 125                 ucBit = ( ( unsigned char ) 1 ) << uxLED;\r
 126 \r
 127                 vTaskSuspendAll();\r
 128                 {\r
 129                         if( ucCurrentOutputValue & ucBit )\r
 130                         {\r
 131                                 ucCurrentOutputValue &= ~ucBit;\r
 132                         }\r
 133                         else\r
 134                         {\r
 135                                 ucCurrentOutputValue |= ucBit;\r
 136                         }\r
 137 \r
 138                         PORTB = ucCurrentOutputValue;\r
 139                 }\r
 140                 xTaskResumeAll();                       \r
 141         }\r
 142 }\r
 143 \r
 144 \r