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#include "clock.h"
/*
TODO: Add functions to set the system time and date.
*/
// ------ UPTIME AND DATETIME --------------------------------------------------
// Uptime is the number of 1/256th second ticks elapsed since the emulator began.
static u32 uptime;
// Increment the local uptime value.
void uptime_handler(void) { uptime++; }
// Configure timer 0 to increment the local uptime value every tick.
void init_nds_clock(void) {
// Start a 256Hz timer to increment the uptime value.
timerStart(0, ClockDivider_1024, TIMER_FREQ_1024(256), uptime_handler);
}
// Return the current time and date.
struct tm* get_datetime(void) {
time_t timestamp = time(NULL);
struct tm* datetime = localtime(×tamp);
return datetime;
}
// ------ TIMERS ---------------------------------------------------------------
// Reset a clock timer.
void timer_reset(ClockTimer *timer) {
timer->end = 0;
timer->read = 0;
timer->write = 0;
}
// Update the cached read value of a timer.
void timer_read(ClockTimer *timer) {
if (timer->end > uptime) {
timer->read = timer->end - uptime;
} else {
timer->read = 0;
timer->end = 0;
}
}
// Update the value of a timer using the cached write value.
void timer_write(ClockTimer *timer) {
if (timer->write) {
timer->end = uptime + timer->write;
} else {
timer->end = 0;
}
}
// ------ CLOCK ----------------------------------------------------------------
// Reset the clock device.
void clock_reset(ClockDevice *clock) {
clock->start = uptime;
timer_reset(&clock->t1);
timer_reset(&clock->t2);
timer_reset(&clock->t3);
timer_reset(&clock->t4);
}
// Update the cached uptime value.
void clock_uptime_read(ClockDevice *clock) {
clock->uptime = uptime - clock->start;
}
// Return true if any timer has expired.
bool clock_check_timers(ClockDevice *clock) {
bool output = false;
if (clock->t1.end && clock->t1.end <= uptime) { clock->t1.end = 0; output = true; }
if (clock->t2.end && clock->t2.end <= uptime) { clock->t2.end = 0; output = true; }
if (clock->t3.end && clock->t3.end <= uptime) { clock->t3.end = 0; output = true; }
if (clock->t4.end && clock->t4.end <= uptime) { clock->t4.end = 0; output = true; }
return output;
}
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