OC1A -> OC1B, and some fixes in the interrupt

gg.c

@@ -18,9 +18,11 @@ void timer_init_tiny26(void)
 	OCR1C = 0xff;/* unused */
 	
 	/* output pin: OC1A = PB1 = 1 or OC1B = PB3 = 2 */
-	OCR1A = 0;
+	OCR1B = 0;
+	cnt_to_next = 1;/* overflows to next sample */
+	
 	TCCR1A = (1 << COM1B1) | (1 << PWM1B);/* pwm enable, not inverted */
-	TCCR1B = (1 << CS10);/* fast pwm, no prescaler */
+	TCCR1B = (1 << CS11) | (1 << CS10);/* fast pwm, prescaler / 2 */
 	DDRB |= (1 << PB3);
 	
 	TIMSK = 1 << TOIE1;/* interrupt on overflow */
@@ -50,21 +52,21 @@ uint32_t length;/* remaining samples */
 
 ISR(TIMER1_OVF1_vect){
     // next try: simplistic, not too much looking at speed
-    uint16_t next;
+    uint16_t next = 0;
 
-    if(--cnt_to_next){
+    if(!--cnt_to_next){
         ringbuf_get(&rb, &next);
-        OCR1A = next>>8;
-        cnt_to_ocr_incr = 7-(next & 0x7);
-        cnt_to_next = 7;
+        OCR1B = next>>8;
+        cnt_to_ocr_incr = 8 - (next & 0x7);
+        cnt_to_next = 8;
         if(!--length)
         {
         	/* shut down */
         	PORTA &= ~(1 << PA7);
         }
     } else {
-        if(--cnt_to_ocr_incr){
-           OCR1A += 1;
+        if(!--cnt_to_ocr_incr){
+           OCR1B += 1;
         }
     }
 }