X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=tinyboard.git;a=blobdiff_plain;f=projects%2Fstep-up%2Fpwm.c;fp=projects%2Fstep-up%2Fpwm.c;h=85d6c6820c4e3768a12016ceae8f75ec021ee2c4;hp=b47227375703f355198f724f63586cdba5937aa7;hb=899ce95294ad696dbd04e2f5722fbbc00f9dec2e;hpb=280768d8d70943db6504131d49d2a916f6ec3acd

diff --git a/projects/step-up/pwm.c b/projects/step-up/pwm.c
index b472273..85d6c68 100644
--- a/projects/step-up/pwm.c
+++ b/projects/step-up/pwm.c
@@ -7,7 +7,7 @@
 
 #define PWM_STEP_SHIFT 2 /* sub-LSB precision */
 #define PWM_TOP (((PWM_MAX) + (4 << (PWM_STEP_SHIFT))) >> (PWM_STEP_SHIFT))
-#if PWM_TOP > 0x3FF
+#if PWM_TOP > 0x0FF
 #error PWM_TOP too high
 #endif
 
@@ -37,26 +37,17 @@ void init_pwm()
 
 	enable_pll();
 
-	// PWM channel D is inverted, ...
-	TCCR1C = _BV(COM1D1) | _BV(COM1D0) | _BV(PWM1D);
-	// PWM channels A and B are not
-	TCCR1A = _BV(COM1A1) | _BV(COM1B1) | _BV(PWM1A) | _BV(PWM1B);
-	TCCR1D = 0;
-	TCCR1B = _BV(CS10); 			// no clock prescaling
+	TCCR1 = _BV(CTC1) | _BV(CS10);	// no clock prescaling
+	GTCCR = _BV(COM1A1) | _BV(COM1B1) | _BV(PWM1A) | _BV(PWM1B);
 
-	TC1H = PWM_TOP >> 8;
-	OCR1C = PWM_TOP & 0xFF;				// TOP value
+	OCR1C = PWM_TOP;
+	OCR1A = OCR1B = 0;		// initial stride is 0
 
-	TC1H = PWM_TOP >> 8;		// PWM3 is inverted
-	OCR1D = PWM_TOP & 0xFF;
-
-	TC1H = 0x00;
-	OCR1B = OCR1A = 0;		// initial stride is 0
-
-	DDRB  &= ~(_BV( PB1 ) | _BV( PB3 ) | _BV( PB5 )); // tristate it
-	PORTB &= ~(_BV( PB1 ) | _BV( PB3 ) | _BV( PB5 )); // set to zero
+	DDRB  &= ~(_BV( PB1 ) | _BV( PB4 )); // tristate it
+	PORTB &= ~(_BV( PB1 ) | _BV( PB4 )); // set to zero
 }
 
+#if 0
 void susp_pwm()
 {
 	unsigned char i;
@@ -71,6 +62,7 @@ void susp_pwm()
 
 	PLLCSR &= ~(_BV(PLLE) | _BV(PCKE));
 }
+#endif
 
 void pwm_off(unsigned char n)
 {
@@ -79,35 +71,21 @@ void pwm_off(unsigned char n)
 
 		switch (n) {
 		case 0: DDRB &= ~_BV(PB1); break;
-		case 1: DDRB &= ~_BV(PB3); break;
-		case 2: DDRB &= ~_BV(PB5); break;
+		case 1: DDRB &= ~_BV(PB4); break;
 		}
 	}
 }
 
 static void pwm_update_hw(unsigned char n)
 {
-	unsigned char hi, lo;
 	uint16_t stride = (pwm[n] + step) >> PWM_STEP_SHIFT;
 
-	if (n == 2)
-		stride = PWM_TOP - stride;
-
-	hi = stride >> 8;
-	lo = stride & 0xFF;
-
 	switch (n) {
 	case 0:
-		TC1H = hi;
-		OCR1A = lo;
+		OCR1A = stride;
 		break;
 	case 1:
-		TC1H = hi;
-		OCR1B = lo;
-		break;
-	case 2:
-		TC1H = hi;
-		OCR1D = lo;
+		OCR1B = stride;
 		break;
 	}
 }
@@ -124,8 +102,7 @@ void pwm_set(unsigned char n, uint16_t stride)
 
 		switch(n) {
 		case 0: DDRB |= _BV(PB1); break;
-		case 1: DDRB |= _BV(PB3); break;
-		case 2: DDRB |= _BV(PB5); break;
+		case 1: DDRB |= _BV(PB4); break;
 		}
 	}
 }