X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Favr%2Fao_pwmin.c;h=73a153b2e4cc67332b879e18b02febe1333687c5;hb=da7ac5e95575f6aa1d2514748869771b7686c0e1;hp=4d96404dca1b07af8850cfa651506e09ec92910d;hpb=1d7e6f5dcb29535cde9b7dfd6998d7889baf835b;p=fw%2Faltos

diff --git a/src/avr/ao_pwmin.c b/src/avr/ao_pwmin.c
index 4d96404d..73a153b2 100644
--- a/src/avr/ao_pwmin.c
+++ b/src/avr/ao_pwmin.c
@@ -25,17 +25,21 @@
  * project payload developed at Challenger Middle School.  
  */
 
+volatile __data uint16_t ao_icp3_count;
+
 static void
 ao_pwmin_display(void) __reentrant
 {
-	uint8_t lo = TCNT1L; 
-	uint8_t hi = TCNT1H;
-	uint16_t value = (hi <<8) | lo;
-
-	/* now display the value we read */
-	printf("timer 1: %5u",  value);
+	/* display the most recent value */
+	printf("icp 3: %5u\n", ao_icp3_count);
 
 }
+ISR(TIMER3_CAPT_vect)
+{
+	uint8_t lo = ICR3L; 
+	uint8_t hi = ICR3H;
+	ao_icp3_count = (hi <<8) | lo;
+}
 
 __code struct ao_cmds ao_pwmin_cmds[] = {
 	{ ao_pwmin_display,	"p\0PWM input" },
@@ -46,6 +50,18 @@ void
 ao_pwmin_init(void)
 {
 	/* do hardware setup here */
+	TCCR3A = ((0 << WGM31) |        /* normal mode, OCR3A */
+                  (0 << WGM30));        /* normal mode, OCR3A */
+        TCCR3B = ((1 << ICNC3) |        /* input capture noise canceler on */
+                  (0 << ICES3) |        /* input capture on falling edge (don't care) */
+                  (0 << WGM33) |        /* normal mode, OCR3A */
+                  (0 << WGM32) |        /* normal mode, OCR3A */
+                  (4 << CS30));         /* clk/256 from prescaler */
+
+    	
+
+        TIMSK3 = (1 << ICIE3);         /* Interrupt on input compare */
+
 		/* set the spike filter bit in the TCCR3B register */
 
 	ao_cmd_register(&ao_pwmin_cmds[0]);