From c440ca7369ce4bde939c51de03c0117b1b642ccc Mon Sep 17 00:00:00 2001
From: PavelSindler <pavel@prusa3d.cz>
Date: Mon, 1 Apr 2019 18:44:13 +0200
Subject: [PATCH] Revert "Phase correct PWM for bed, frequency 40KHz."

---
 Firmware/timer02.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/Firmware/timer02.c b/Firmware/timer02.c
index 113c7246..8309f940 100644
--- a/Firmware/timer02.c
+++ b/Firmware/timer02.c
@@ -11,11 +11,19 @@
 
 uint8_t timer02_pwm0 = 0;
 
-
 void timer02_set_pwm0(uint8_t pwm0)
 {
-	TCCR0A |= (2 << COM0B0); //switch OC0B to OCR mode
-	OCR0B = (uint16_t)OCR0A * pwm0 / 255;
+	if (timer02_pwm0 == pwm0) return;
+	if (pwm0)
+	{
+		TCCR0A |= (2 << COM0B0);
+		OCR0B = pwm0 - 1;
+	}
+	else
+	{
+		TCCR0A &= ~(2 << COM0B0);
+		OCR0B = 0;
+	}
 	timer02_pwm0 = pwm0;
 }
 
@@ -31,12 +39,13 @@ void timer02_init(void)
 	TIMSK0 &= ~(1<<OCIE0B);
 	//setup timer0
 	TCCR0A = 0x00; //COM_A-B=00, WGM_0-1=00
-	OCR0A = 200; //max PWM value (freq = 40kHz)
-	OCR0B = 0; //current PWM value
-	//switch timer0 to mode 5 (Phase Correct PWM)
-	TCCR0A |= (1 << WGM00); //WGM_0-1=01
-	TCCR0B = (1 << CS00) | (1 << WGM02); //WGM_2=1, CS_0-2=001 (no prescaling)
-	TCCR0A |= (2 << COM0B0); //switch OC0B to OCR mode
+	TCCR0B = (1 << CS00); //WGM_2=0, CS_0-2=011
+	//switch timer0 to fast pwm mode
+	TCCR0A |= (3 << WGM00); //WGM_0-1=11
+	//set OCR0B register to zero
+	OCR0B = 0;
+	//disable OCR0B output (will be enabled in timer02_set_pwm0)
+	TCCR0A &= ~(2 << COM0B0);
 	//setup timer2
 	TCCR2A = 0x00; //COM_A-B=00, WGM_0-1=00
 	TCCR2B = (4 << CS20); //WGM_2=0, CS_0-2=011