Commit 6be3d869 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

arduino nano: fix timer; note that it's limited to ≥ 62 Hz

parent a324a83c

include/arch/arduino-nano/driver/timer.h

+9 −4
Original line number Diff line number Diff line
@@ -17,13 +17,18 @@ class Timer { 
	public:

		Timer() {}



		inline void setup_khz(uint16_t const frequency) {

			OCR0A = frequency ? 255 / frequency : 1;

		inline void setup_khz(uint16_t const frequency) { // 16 MHz / 64 == 250 kHz base

			OCR0A = frequency ? 250 / frequency : 1;

			TCCR0A = _BV(WGM01);

			prescaler = _BV(CS01) | _BV(CS00);

		}

		inline void setup_hz(uint16_t const frequency) {

			OCR0A = frequency ? 255 / frequency : 1;

		// lowest supported frequency: 62 Hz

		inline void setup_hz(uint16_t const frequency) { // 16 MHz / 1024 == 15.625 kHz base

			if (15625 / frequency > 255) {

				OCR0A = 255;

			} else {

				OCR0A = 15625 / frequency;

			}

			TCCR0A = _BV(WGM01);

			prescaler = _BV(CS02) | _BV(CS00);

		}