Timer Controller Driver function reference

pic18f26k83_timer.h

PIC18 Timer driver provides millis function.

This module provides basic timer functionalities, such as initializing Timer0, handling interrupts, and tracking milliseconds since the timer was started.

Functions

void timer0_init(void)

Initializes Timer0 for time tracking. This function must be called before using any other timer-related functionality.

  • Enables Timer0 interrupt.

  • Sets the timer to 8-bit mode.

  • Driven by a 500 kHz clock.

  • Ensures the timer is synchronized to the system clock.

void timer0_handle_interrupt(void)

Function should be called from main ISR when Timer0 interrupt is triggered.

This function should be called from the main Interrupt Service Routine (ISR) whenever the Timer0 interrupt is triggered. It updates the internal time counter.

Warning

This function does not clear the interrupt flag (PIR3bits.TMR0IF), This is the responsibility of the top level ISR.

uint32_t millis(void)

Returns the number of milliseconds since timer0_init() was called.

Returns the number of milliseconds since timer0_init() was called. This is a safe function that disables interrupts momentarily to return a consistent value.