3DPrinting/Prusa-Firmware
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Revert "Phase correct PWM for bed, frequency 40KHz."

Browse Source
This commit is contained in:
PavelSindler 2019-04-01 18:44:13 +02:00 committed by GitHub
parent a60a1cbef4
commit c440ca7369
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 18 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
Firmware/timer02.c
View File

@ -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