#define PWM_ORDER 10
#define PWM_HALF 5
-#define LIGHT_THRESHOLD 200
-#define TIME_ON 16
+#define LIGHT_THRESHOLD 900
+#define TIME_ON 320
#ifdef ADCSC /* Let us hope that this is a "new" model */
# define BIT_RL BIT0
# define BIT_BTN2 0
#endif
+static int expon2(int duty)
+{
+ int shift = duty>>1;
+ int comp = 1<<shift;
+ int extra = (duty & 1) ? comp>>1 : 0;
+ return (duty ? comp|extra : 0);
+}
+
int main(void)
{
int Duty_Cycle = 0;
int Increment = 1;
- unsigned int Time_Count = 0;
- unsigned int Time_Left = 5;
+ unsigned int Time_Left = 50;
+ unsigned int Time_Indicate = 2;
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
// Configure GPIO Out
_enable_interrupts();
// Button 2 or PIR events initiate light measurement
- // and tuns on green led
+ // and tuns on green or red led
if (events & (1<<ev_btn2|1<<ev_pir1|1<<ev_pir2)) {
- if (Duty_Cycle > 0) {
- Time_Left = TIME_ON;
- continue;
- }
- P1OUT |= BIT_GL; // Set green LED on
+ if (events & 1<<ev_pir1)
+ P1OUT |= BIT_GL; // Set green LED on
+ if (events & 1<<ev_pir2)
+ P1OUT |= BIT_RL; // Set red LED on
// Sampling and conversion start
#ifdef ADCENC
ADCCTL0 |= ADCENC | ADCSC;
// End of light measurement. Set new Duty_Cycle,
// zero increment and turn off green led
if (events & 1<<ev_adc) {
- P1OUT &= ~BIT_GL; // Clear green LED off
- if (Time_Left)
- continue;
+ P1OUT ^= (BIT_GL|BIT_RL); // Flip green and red LEDs
+ Time_Indicate = 5;
if (ADC_Result < LIGHT_THRESHOLD)
continue;
Time_Left = TIME_ON;
// Button 1 sets non-zero increment (and toggles it)
if (events & 1<<ev_btn1) {
+ P1OUT |= (BIT_GL|BIT_RL); // Set green and red LEDs on
+ Time_Indicate = 5;
if (Duty_Cycle > PWM_HALF) {
Time_Left = 0;
Increment = -1;
// Timer event (100 ms) changed duty cycle and flashes red led
if (events & 1<<ev_tmr) {
- if (Time_Count++ > 20) {
- Time_Count = 0;
- P1OUT |= BIT_RL; // red LED on
- if (Time_Left)
- Time_Left--;
- else if (Duty_Cycle > 1)
- Increment = -1;
- } else if (Time_Count == 1)
- P1OUT &= ~BIT_RL; // red LED off
+ if (Time_Indicate) {
+ Time_Indicate--;
+ if (!Time_Indicate)
+ P1OUT &= ~(BIT_RL|BIT_GL); // LEDs off
+ }
+ if (Time_Left) {
+ Time_Left--;
+ if (!Time_Left)
+ if (Duty_Cycle)
+ Increment = -1;
+ }
if (Increment > 0) {
- if (++Duty_Cycle >= PWM_ORDER) {
- Duty_Cycle = PWM_ORDER;
+ if (++Duty_Cycle >= (PWM_ORDER<<1)) {
+ Duty_Cycle = PWM_ORDER<<1;
Increment = 0;
}
} else if (Increment < 0) {
Duty_Cycle = 0;
Increment = 0;
}
- } else
+ } else // Increment _was_ zero - no change!
continue;
- if (Duty_Cycle)
- TA0CCR2 = 1 << (Duty_Cycle - 1);
- else
- TA0CCR2 = 0;
+
+ TA0CCR2 = expon2(Duty_Cycle);
}
__bis_SR_register(LPM0_bits | GIE);
__no_operation();