tools/examples/default/main.c

   1 /**************************************************************************/
   2 /*!
   3     @file     main.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @section LICENSE
   7
   8     Software License Agreement (BSD License)
   9
  10     Copyright (c) 2011, microBuilder SARL
  11     All rights reserved.
  12
  13     Redistribution and use in source and binary forms, with or without
  14     modification, are permitted provided that the following conditions are met:
  15     1. Redistributions of source code must retain the above copyright
  16     notice, this list of conditions and the following disclaimer.
  17     2. Redistributions in binary form must reproduce the above copyright
  18     notice, this list of conditions and the following disclaimer in the
  19     documentation and/or other materials provided with the distribution.
  20     3. Neither the name of the copyright holders nor the
  21     names of its contributors may be used to endorse or promote products
  22     derived from this software without specific prior written permission.
  23
  24     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  25     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  26     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  28     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  31     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35 /**************************************************************************/
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39
  40 #include "projectconfig.h"
  41 #include "sysinit.h"
  42
  43 #include "core/gpio/gpio.h"
  44 #include "core/systick/systick.h"
  45
  46 #ifdef CFG_INTERFACE
  47   #include "core/cmd/cmd.h"
  48 #endif
  49
  50 /**************************************************************************/
  51 /*!
  52     Approximates a 1 millisecond delay using "nop".  This is less
  53     accurate than a dedicated timer, but is useful in certain situations.
  54
  55     The number of ticks to delay depends on the optimisation level set
  56     when compiling (-O).  Depending on the compiler settings, one of the
  57     two defined values for 'delay' should be used.
  58 */
  59 /**************************************************************************/
  60 void delayms(uint32_t ms)
  61 {
  62   uint32_t delay = ms * ((CFG_CPU_CCLK / 100) / 45);      // Release Mode (-Os)
  63   // uint32_t delay = ms * ((CFG_CPU_CCLK / 100) / 120);  // Debug Mode (No optimisations)
  64
  65   while (delay > 0)
  66   {
  67     __asm volatile ("nop");
  68     delay--;
  69   }
  70 }
  71
  72 /**************************************************************************/
  73 /*!
  74     Main program entry point.  After reset, normal code execution will
  75     begin here.
  76 */
  77 /**************************************************************************/
  78 int main(void)
  79 {
  80   // Configure cpu and mandatory peripherals
  81   systemInit();
  82
  83   uint32_t currentSecond, lastSecond;
  84   currentSecond = lastSecond = 0;
  85
  86   while (1)
  87   {
  88     // Toggle LED once per second ... rollover = 136 years :)
  89     currentSecond = systickGetSecondsActive();
  90     if (currentSecond != lastSecond)
  91     {
  92       lastSecond = currentSecond;
  93       if (gpioGetValue(CFG_LED_PORT, CFG_LED_PIN) == CFG_LED_OFF)
  94       {
  95         gpioSetValue (CFG_LED_PORT, CFG_LED_PIN, CFG_LED_ON);
  96       }
  97       else
  98       {
  99         gpioSetValue (CFG_LED_PORT, CFG_LED_PIN, CFG_LED_OFF);
 100       }
 101     }
 102
 103     // Poll for CLI input if CFG_INTERFACE is enabled in projectconfig.h
 104     #ifdef CFG_INTERFACE
 105       cmdPoll();
 106     #endif
 107   }
 108
 109   return 0;
 110 }