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#include "timer0.h"
#include "button.h"
#include "printf_P.h"


#ifdef USE_FOLLOWME
#define BUTTON       !(PINC & (1<<PINC6))
#endif
#ifdef USE_SDLOGGER
#define BUTTON       !(PINC & (1<<PINC3))
#endif

#define CNT_KEY     10 // at least 3
#define KEY_DELAY_MS  50

uint16_t ButtonTimer = 0;

void Button_Init(void)
{
        printf("\r\n BUTTON init...");
        // set port pin as input pullup
        #ifdef USE_FOLLOWME
        PORTC |= (1 << PORTC6);
        DDRC &= ~(1 << DDC6);
        #endif

        #ifdef USE_SDLOGGER
        PORTC |= (1 << PORTC3);
        DDRC &= ~(1 << DDC3);
        #endif
        ButtonTimer = SetDelay(KEY_DELAY_MS);
        printf("ok");
}

uint8_t GetButton(void)
{
        static uint8_t button = 0;
        uint8_t ret = 0;

        if(CheckDelay(ButtonTimer))
        {
                if(BUTTON)
                {
                        if(button++ == 0 || button == CNT_KEY) ret = 1;
                        if(button == CNT_KEY) button = CNT_KEY - CNT_KEY / 3;
                }
                else button = 0;
                ButtonTimer = SetDelay(KEY_DELAY_MS);
        }
        return(ret);
}