Move PWM and MOSFET implementations into separate module files

src/bus/pwm.c

@@ -0,0 +1,44 @@
+#include "common.h"
+#include "bus/pwm.h"
+
+int PWM_Init(void)
+{
+	// PD4: PWM NF-12 Fan Peltier Hot Side
+	// PD5: PWM NF-A8 Fan Peltier Cold Side
+	// PD7: PWM NF-R8 Fan Heating Element
+
+	DDRD |= BIT(PD4) | BIT(PD5) | BIT(PD7);
+
+	// Fast mode, non-inverting, no prescaling
+	TCCR1A = BIT(WGM11) | BIT(COM1A1) | BIT(COM1B1);
+	TCCR1B = BIT(WGM12) | BIT(WGM13) | BIT(CS10);
+	TCCR2 = BIT(WGM20) | BIT(WGM21) | BIT(COM21) | BIT(CS20);
+	ICR1 = PWM_CYCLE_TOP; // 8000 MHz / 25000 KHz
+
+	// TODO: Enable 25 KHz frequency for timer 3
+
+	OCR1A = FAN01_MIN_DUTY;
+	OCR1B = FAN02_MIN_DUTY;
+	OCR2 = FAN03_MIN_DUTY;
+
+	return 0;
+}
+
+// Port must be PD4, PD5 or PD7 and the value is
+// expected to be in the range between 0 and 100
+void PWM_SetValue(int port, int value)
+{
+	int n;
+
+	if (port != PD4 && port != PD5 && port != PD7)
+		return; // Invalid port
+
+	n = CLAMP(value, 100, 0) * (PWM_CYCLE_TOP / 100.0f);
+	Info("Setting PWM value to %d...", n);
+
+	switch (port) {
+	case PD4: OCR1B = n; break;
+	case PD5: OCR1A = n; break;
+	case PD7: OCR2  = n; break;
+	}
+}