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Support FAN03 PWM with reduced frequency on m32a until m1284p port is finished

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This commit is contained in:
Leon Krieg
2024-10-01 03:12:17 +02:00
parent 396662bf7c
commit f85ff6bf3e
3 changed files with 12 additions and 15 deletions
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19
src/bus/pwm.c
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@@ -93,15 +93,10 @@ int PWM_Init(void)
OCR1B = FAN01_MIN_DUTY; // PD4
OCR1A = FAN02_MIN_DUTY; // PD5
// TIMER2: Fast mode, non-inverting, top=0xFF, prescale /8
// TOP set to 8000000 (f_cpu) / 8 (prescale) / 25000 (f_pwm) - 1
// TIMER2: Fast mode, non-inverting, top=0xFF, prescale /1
TCCR2 = BIT(WGM20) | BIT(WGM21) | BIT(COM21) | BIT(CS21);
OCR2 = 255; // XXX: OCR2A=TOP OCR2B=duty
// TCCR2 = 0; // Normal operation
// OCR2 = FAN03_MIN_DUTY; // PD7
// PORTD &= ~BIT(PD7); // Low
TCCR2 = BIT(WGM20) | BIT(WGM21) | BIT(COM21) | BIT(CS20);
OCR2 = FAN03_MIN_DUTY;
return 0;
}
@@ -109,18 +104,20 @@ int PWM_Init(void)
// Value in range 0-100 is expected
void PWM_SetValue(int port, int value)
{
int n;
int n, m;
if (port != FAN01 && port != FAN02 && port != FAN03)
return; // Invalid port
n = CLAMP(value, 100, 0) * (PWM_CYCLE_TOP / 100.0f);
// Workaround: Missing third 16-bit timer output
m = (port != FAN03) ? PWM_CYCLE_TOP : 0xFF;
n = CLAMP(value, 100, 0) * m / 100.0f;
Info("Setting duty cycle for %s to %d/%d...",
(port == FAN01) ? "FAN01" :
(port == FAN02) ? "FAN02" :
(port == FAN03) ? "FAN03" :
"UNKNOWN", n, PWM_CYCLE_TOP);
"UNKNOWN", n, m);
switch (port) {
case PD4: OCR1B = n; break;

2
src/bus/pwm.h
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@@ -11,7 +11,7 @@
#define PWM_CYCLE_TOP (F_CPU / 25000 - 1) // 8 MHz / 25 KHz
#define FAN01_MIN_DUTY (PWM_CYCLE_TOP * 0.2f)
#define FAN02_MIN_DUTY (PWM_CYCLE_TOP * 0.2f)
#define FAN03_MIN_DUTY (PWM_CYCLE_TOP * 0.2f)
#define FAN03_MIN_DUTY (0xFF * 0.2f)
int PWM_Init(void);
void PWM_SetValue(int port, int value);

2
src/main.c
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@@ -120,7 +120,7 @@ static int Init(void)
PWM_SetValue(FAN01, 50); // Fan Peltier Hot side
PWM_SetValue(FAN02, 50); // Fan Peltier Cold Side
// PWM_SetValue(FAN03, 20); // Fan Heating
PWM_SetValue(FAN03, 50); // Fan Heating
// The I2C_SetChannel command changes the channel
// setting of the PCA9546 I2C multiplexer. Any