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/*------------------------------------------------------------------------------
 SBL2e Periodic Interrupt Timer (PIT) example
 This example will initialize a PIT timer to post a semaphonre every 50ms. The
 number of posts will then be counted to time an event such as 1600ms.
 *----------------------------------------------------------------------------*/


#include "predef.h"
#include <stdio.h>
#include <ctype.h>
#include <basictypes.h>
#include <serialirq.h>
#include <system.h>
#include <constants.h>
#include <ucos.h>
#include <netif.h>
#include <autoupdate.h>
#include <smarttrap.h>
#include <pins.h>
#include <pinconstant.h>
#include "pit1_sem.h"


#define DEBOUNCE_MIN    50
#define INPUT_PIN       7

extern "C" {
    void UserMain(void * pd);
}

const char * AppName = "SBL2e PIT Timer Ex";

/*-------------------------------------------------------------------
 * UserMain
 *------------------------------------------------------------------*/
void UserMain(void * pd)
{
    SimpleUart(0, SystemBaud);
    assign_stdio(0);
    InitializeStack();
    OSChangePrio(MAIN_PRIO);
    EnableAutoUpdate();

#ifndef _DEBUG
    EnableSmartTraps();
#endif

    iprintf("Application started\n");

    OS_SEM MyPit1Sem;
    OSSemInit( &MyPit1Sem, 0 );

    // Create a timer to trigger every 50ms. Then determine the number of
	// "ticks" it will take to reach 1600ms.
	// 20 ticks per second = one tick every 50ms. 1600ms/50ms = 32 ticks.
    const int Pit1TicksPerSec = 1000;

    // level 6, prio 3
    InitPit1Semaphore( &MyPit1Sem, Pit1TicksPerSec, 6, 3 );

    Pins[7].function(PINX_GPIO);
    int stableState = Pins[INPUT_PIN];
    int lastRead = stableState;
    int thisRead;
    int debounceCount = 0;

    while (1)
    {
        OSSemPend( &MyPit1Sem, TICKS_PER_SECOND * 10 );

        thisRead = Pins[INPUT_PIN];

        if (thisRead == lastRead) {
            debounceCount++;
            if (debounceCount == DEBOUNCE_MIN) {
                stableState = thisRead;
                iprintf("Button Pressed -- New State: %d", stableState);
            }
        }
        else {
            debounceCount = 1;
        }

        lastRead = thisRead;
    }
}