/* Simple system tick interrupt test program */

// Copyright (C)2013-2018, Philip Munts, President, Munts AM Corp.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <cpu.h>

#define SYSTICKRATE	100

_BEGIN_STD_C

static volatile int TimerCounter = 0;
static volatile int TimerFlag = false;

void SysTick_Handler(void)
{
  if (++TimerCounter == SYSTICKRATE)
  {
    TimerCounter = 0;
    TimerFlag = true;
  }
}

_END_STD_C

int main(void)
{
  cpu_init(DEFAULT_CPU_FREQ);
  serial_stdio(CONSOLE_PORT);

  printf("\033[H\033[2J%s System Tick Interrupt Test (" __DATE__ " " __TIME__ ")\n\n", MCUFAMILYNAME);
  printf("CPU Freq:%u Hz  Compiler:%s %s %s\n\n", (unsigned int) SystemCoreClock,
    __COMPILER__, __VERSION__, __ABI__);

// Configure LED(s)

  LEDS_initialize();
  LEDS_set(LED1|LED3|LED5|LED7);

// Initialize System Tick

  SysTick_Config(SystemCoreClock / SYSTICKRATE);

// Display "Tick..." every second

  for (;;)
  {
    if (TimerFlag)
    {
      TimerFlag = false;

      puts("Tick...");

      LEDS_set(~LEDS_get());
    }
  }
}