X-Git-Url: http://www.average.org/gitweb/?p=sensor-light.git;a=blobdiff_plain;f=msp430%2Fmain.c;h=6b075ad91d6b9753f86cb258216d88227842d174;hp=8df6210c9836f6c8f835315b20666458322d8bfa;hb=68eddb43a02efafa7d42778a58659313199c8228;hpb=253b976dda41a5ad72586c08ef651bcb1dc00e2e

diff --git a/msp430/main.c b/msp430/main.c
index 8df6210..6b075ad 100644
--- a/msp430/main.c
+++ b/msp430/main.c
@@ -6,7 +6,7 @@ enum {ev_btn1 = 0, ev_btn2, ev_pir1, ev_pir2, ev_tmr, ev_adc, ev_MAX};
 
 #define PWM_ORDER 10
 #define PWM_HALF 5
-#define LIGHT_THRESHOLD 200
+#define LIGHT_THRESHOLD 600
 #define TIME_ON 16
 	
 #ifdef ADCSC /* Let us hope that this is a "new" model */
@@ -24,12 +24,21 @@ enum {ev_btn1 = 0, ev_btn2, ev_pir1, ev_pir2, ev_tmr, ev_adc, ev_MAX};
 # 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_Indicate = 2;
 
 	WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer
 	// Configure GPIO Out
@@ -107,13 +116,12 @@ int main(void)
 		_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;
@@ -125,9 +133,8 @@ int main(void)
 		// 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;
@@ -136,6 +143,8 @@ int main(void)
 
 		// 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;
@@ -147,18 +156,21 @@ int main(void)
 
 		// Timer event (100 ms) changed duty cycle and flashes red led
 		if (events & 1<<ev_tmr) {
-			if (Time_Count++ > 20) {
+			if (Time_Indicate) {
+				Time_Indicate--;
+				if (!Time_Indicate)
+					P1OUT &= ~(BIT_RL|BIT_GL); // LEDs off
+			}
+			if (Time_Count++ > 10) {
 				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 (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) {
@@ -168,7 +180,8 @@ int main(void)
 				}
 			} else
 				continue;
-			TA0CCR2 = 1 << Duty_Cycle;
+
+			TA0CCR2 = expon2(Duty_Cycle);
 		}
 		__bis_SR_register(LPM0_bits | GIE);
 		__no_operation();