main.c

#include "CTS_Layer.h"

#include "RTC.h"
#include "state.h"

// Define User Configuration values //
//----------------------------------//
// Sensor settings
#define KEY_lvl     0xfffe//375         // Defines the min count for a "key press"
                                        // Set to ~ half the max delta expected
#define PRESSED     1

// Global variables for sensing
unsigned int base_cnt[2];
unsigned int meas_cnt[2];
unsigned int delta_cnt;
uint8_t touch_press = 0;
uint8_t CCR0_interrupted = 0;

extern volatile uint16_t minutes;           // Minutes (0 to 12*60-1)
extern volatile uint8_t count_time;         // 4th of seconds counter
extern State state;                         // State of the device

volatile uint8_t fourth = 0;                // 4th of seconds spent (0 to 4*60-1)

// Main Function
void main(void)
{
  WDTCTL = WDT_ADLY_1_9;                // WDT 250ms interval timer
  IE1 |= WDTIE;                         // Enable WDT interrupt

  BCSCTL1 = CALBC1_8MHZ;                // Set DCO to 8MHz
  DCOCTL = CALDCO_8MHZ;

  BCSCTL1 |= DIVA_0;                    // ACLK = 32.768kHz/1
  BCSCTL2 = 0b00000000;                 // MCLK = DCOCLK/1, SMCLK=DCOCLK/1
  BCSCTL3 = LFXT1S_0 + XCAP_3;          // LFXT1 = 32768-Hz crystal on LFXT1 + 12.5pF caps

  P1OUT = 0x00;
  P1DIR = 0xFF & ~BIT2;//~(BIT2+BIT6);          // All outputs except P1.2 & P1.6 (touch sensors)

  P2OUT = 0x00;                         // Drive all Port 2 pins low
  P2DIR = 0xFF;                         // Configure all Port 2 pins outputs

  TA0CTL &= ~(BIT4 + BIT5);             // Stop TimerA

  sleep(50);

  // Initialize Baseline measurement
  TI_CAPT_Raw(&middle_button,base_cnt);

  // Main loop starts here
    while (1)
    {
        updateInputs();
        updateStateMachine();
        updateOutputs();
    }
} // End Main

void updateTouchSensor(void) {
    // Take raw delta measurement
    TI_CAPT_Raw(&middle_button,meas_cnt);

    if(base_cnt[0] < meas_cnt[0])   // Handle baseline measurement for a base C decrease
    {                       // beyond baseline, i.e. cap decreased
        base_cnt[0] = (base_cnt[0]+meas_cnt[0]) >> 1;   // Re-average baseline up quickly
        delta_cnt = 0;                          // Zero out delta for position determination
    }
    else
    {
        delta_cnt = base_cnt[0] - meas_cnt[0];  // Calculate delta: c_change
    }

    if (delta_cnt > KEY_lvl)    // Determine if each key is pressed per a preset threshold
    {
        // Button is pressed
        //base_cnt = base_cnt - (base_cnt >> 6);    // Adjust baseline down, should be VERY slow
        touch_press = PRESSED;
    }
    else
    {
        // Button is not pressed
        base_cnt[0] = base_cnt[0] - (base_cnt[0] >> 3); // Adjust baseline down, should be slow
        touch_press = !PRESSED;
    }
}

/******************************************************************************/
// Timer0_A0 Capture Interrupt Service Routine: Exists LPM0
/******************************************************************************/
#pragma vector=TIMER0_A0_VECTOR
__interrupt void timerA0_capture_event(void) {
    _BIC_SR_IRQ(LPM0_bits);                 // Exits LPM0
    P1OUT |= BIT6;
    CCR0_interrupted = 1;
}


//#ifdef WDT_GATE
// Watchdog Timer interrupt service routine
#pragma vector=WDT_VECTOR
__interrupt void watchdog_timer(void)
{
    _BIC_SR_IRQ(LPM3_bits);                 // Exits LPM3
    P1OUT |= BIT0;

    fourth++;
    if(fourth >= 240) {
        fourth = 0;
        minutes++;
        if (minutes >= MIN_IN_HALF_DAY) {
            minutes = 0;
        }
    }

    count_time++;
}
//#endif