mytimer.c

#include "mytimer.h"

/*
 * 07A_TIMER_A0_interrupt: counts up on timer A0 and then interrupts
 * The interrupt then toggles the LED.  Uses LPM3.
 *
 * MCLK defaults to ~1.045 MHz
 * ACLK defaults to ~32768 Hz
 * Timer divides ACLK by 32 so  ~1024 MHZ
 * With TIMER_PERIOD set to 512 an interrupt occurs every 1/2 secs
 *     The frequency is approximately 1 Hz for full cycle
 *
 * Frank Milburn 	25 August 2016
 * Developed on MSP-EXP430F5529 LaunchPad Rev1.5 on CCS V6.1, TIv16.6.0.STS
 */

#define TIMER_PERIOD 4096

volatile uint8_t read_uv_flag = 0;

//--------------------------------  m a i n  -----------------------------------
void setup_timer_interrupts(void)
{
    //Start timer
    Timer_A_clearTimerInterrupt(TIMER_A0_BASE);

    Timer_A_initUpModeParam param =
    {
        TIMER_A_CLOCKSOURCE_ACLK,               // ACLK clock source ~32.768kHz
        TIMER_A_CLOCKSOURCE_DIVIDER_32,          // ACLK/?? = ??kHz
        512,                                  // debounce period
        TIMER_A_TAIE_INTERRUPT_DISABLE,         // Disable Timer interrupt
        TIMER_A_CCIE_CCR0_INTERRUPT_ENABLE ,    // Enable CCR0 interrupt
        TIMER_A_DO_CLEAR,                       // Clear value
        true                                    // Start Timer
    };

    Timer_A_initUpMode(TIMER_A0_BASE, &param);
}

void handle_sensor_distance() {
    //if (!read_uv_flag) return;

    //read_uv_flag = 0;
    if ((read_uv() < 400)) {
        showHex(1);
    } else {
        showHex(0);
    }
}

unsigned int read_uv() {
    return uv_test(TRIG_PORT, TRIG_PIN, U_SENSOR4_PORT, U_SENSOR4_PIN);
}


//-------------------------  T I M E R A 0 _ I S R  ----------------------------
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER0_A0_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(TIMERA0_VECTOR)))
#endif
    void
    TIMERA0_ISR(void)
{
    read_uv_flag = 1;
}
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