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update simulator rtc counter improvements to match real hardware

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redraw
2026-01-22 10:29:52 -03:00
parent 7d4a80a29d
commit a3664b0789
1 changed files with 6 additions and 22 deletions
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watch-library/simulator/watch/watch_rtc.c
+6 -22
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@@ -39,7 +39,6 @@ static uint32_t counter_interval;
static uint32_t counter;
static uint32_t reference_timestamp;
static double next_tick_time;
static double rtc_start_time;
#define WATCH_RTC_N_COMP_CB 8
@@ -111,18 +110,7 @@ unix_timestamp_t watch_rtc_get_unix_time(void) {
}
rtc_counter_t watch_rtc_get_counter(void) {
if (!counter_interval) {
return counter; // RTC not running
}
// Calculate current counter from high-precision time
double now = EM_ASM_DOUBLE({ return performance.now(); });
double elapsed_ms = now - rtc_start_time;
// Convert elapsed time to RTC ticks (RTC_CNT_HZ = 128 Hz)
double elapsed_ticks = (elapsed_ms * RTC_CNT_HZ) / 1000.0;
return (rtc_counter_t)elapsed_ticks;
return counter;
}
uint32_t watch_rtc_get_frequency(void) {
@@ -183,7 +171,6 @@ static void _watch_schedule_next_tick(void) {
if (!counter_interval) return;
double now = EM_ASM_DOUBLE({ return performance.now(); });
double drift = now - next_tick_time;
// Target interval in ms
double ms = 1000.0 / (double)RTC_CNT_HZ;
@@ -192,13 +179,12 @@ static void _watch_schedule_next_tick(void) {
next_tick_time += ms;
double delay = next_tick_time - now;
// Ensure we don't schedule negative or zero delays
if (delay < 0.1) {
delay = 0.1;
next_tick_time = now + delay;
// If we're behind, schedule immediately
if (delay < 0) {
delay = 0;
}
emscripten_async_call(_watch_increase_counter, NULL, (int)delay);
emscripten_async_call(_watch_increase_counter, NULL, delay);
}
static void _watch_increase_counter(void *userData) {
@@ -385,9 +371,7 @@ void watch_rtc_enable(bool en)
if (en) {
// Use drift-correcting timer instead of fixed setInterval
counter_interval = 1; // Non-zero to indicate enabled
rtc_start_time = EM_ASM_DOUBLE({ return performance.now(); });
next_tick_time = rtc_start_time;
counter = 0;
next_tick_time = EM_ASM_DOUBLE({ return performance.now(); });
_watch_schedule_next_tick();
} else {
counter_interval = 0;