X-Git-Url: http://www.average.org/gitweb/?p=sensor-light.git;a=blobdiff_plain;f=msp430%2Fmain.c;h=fc80ae9b04fdbeeb4e180960ee4b055c34d745db;hp=03786aa4b5cb1ab5383644151f2d92310d73eb56;hb=662310e4999c78fb786068643f100e76b9294c68;hpb=c9ef989a5af20427a69004b565b48e7e30316326

diff --git a/msp430/main.c b/msp430/main.c
index 03786aa..fc80ae9 100644
--- a/msp430/main.c
+++ b/msp430/main.c
@@ -6,8 +6,8 @@ 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 600
-#define TIME_ON 16
+#define LIGHT_THRESHOLD 800
+#define TIME_ON 160
 	
 #ifdef ADCSC /* Let us hope that this is a "new" model */
 # define BIT_RL BIT0
@@ -24,12 +24,19 @@ 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_Left = 50;
 	unsigned int Time_Indicate = 2;
 
 	WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer
@@ -153,16 +160,15 @@ int main(void)
 				if (!Time_Indicate)
 					P1OUT &= ~(BIT_RL|BIT_GL); // LEDs off
 			}
-			if (Time_Count++ > 20) {
-				Time_Count = 0;
-				if (Time_Left)
-					Time_Left--;
-				else if (Duty_Cycle > 1)
-					Increment = -1;
+			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) {
@@ -170,12 +176,10 @@ int main(void)
 					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();