Horochov/avrElapsedTime

This repo contains elapsed time measurement functions. Compatible with arduino millis() and micros().

elapsedTime

This code implements arduino-like millis() functions, written in clear C and tested on atmega328.

Functions

void timer_init(void)

Sets up 8bit timer0 to CTC mode, 1ms interval and turns it on.

void timer_disable() and void timer_enable()

Turn on/off timer via setting prescaler.

void timer_reset(void)

Set elapsed time to 0

uint32_t timer_getMs(void) and uint32_t timer_getUs(void)

Returns time in millisecounds since init or reset call. Also callable by alias millis().

uint32_t timer_getUs(void);

Returns time in microsecounds since init or reset call. Also callable by alias micros().

This function uses timer register TIFRx to get relatively high accouracy without spamming with interrupts.

Lowest accouracy is something like 8us, will depend on F_CPU like this: 1/((F_CPU/1000/64)-1)

Copied from arduino source.

uint32_t timer_getSec(void);

Returns time in secounds since init or reset call.