tools/examples/basics/blinky_nonblocking/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) 2010, 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 "projectconfig.h"
  37 #include "sysinit.h"
  38
  39 #include "core/gpio/gpio.h"
  40 #include "core/systick/systick.h"
  41
  42 #ifdef CFG_INTERFACE
  43   #include "core/cmd/cmd.h"
  44 #endif
  45
  46 /**************************************************************************/
  47 /*!
  48     Causes the LED to flash every second using a non-blocking delay,
  49     and constantly checks if any incoming characters have arrived in
  50     the UART buffer for the CLI
  51
  52     projectconfig.h settings:
  53     --------------------------------------------------
  54     CFG_INTERFACE     -> Enabled
  55     CFG_PRINTF_USBCDC -> Enabled if USB is used for the CLI
  56     CFG_PRINTF_UART   -> Enabled if UART is used for the CLI
  57 */
  58 /**************************************************************************/
  59 int main(void)
  60 {
  61   // Configure cpu and mandatory peripherals
  62   systemInit();
  63
  64   uint32_t currentSecond, lastSecond;
  65   currentSecond = lastSecond = 0;
  66
  67   // Toggle LED once per second and constantly check CLI input
  68   while (1)
  69   {
  70     // Get the number of seconds the CPU has been active
  71     // If the value has changed we've advanced at least 1 second
  72     currentSecond = systickGetSecondsActive();
  73     if (currentSecond != lastSecond)
  74     {
  75       lastSecond = currentSecond;
  76       // Toggle the LED
  77       if (gpioGetValue(CFG_LED_PORT, CFG_LED_PIN) == CFG_LED_OFF)
  78       {
  79         gpioSetValue (CFG_LED_PORT, CFG_LED_PIN, CFG_LED_ON);
  80       }
  81       else
  82       {
  83         gpioSetValue (CFG_LED_PORT, CFG_LED_PIN, CFG_LED_OFF);
  84       }
  85     }
  86
  87     // Poll for CLI input if CFG_INTERFACE is enabled in projectconfig.h
  88     #ifdef CFG_INTERFACE
  89       cmdPoll();
  90     #endif
  91   }
  92
  93   return 0;
  94 }