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Implement low_power_sleep_until_irq

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Add to hello_sleep_gpio test using chars_available_callback
This commit is contained in:
William Vinnicombe 2025-09-05 15:56:01 +01:00
parent 69f8242a51
commit bcff0549fc
2 changed files with 36 additions and 0 deletions
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20
src/rp2_common/pico_low_power/low_power.c
View file

@ -182,6 +182,26 @@ static void restore_other_interrupts(void) {
}
}
int low_power_sleep_until_irq(const clock_dest_set_t *keep_enabled) {
clock_dest_set_t local_keep_enabled;
replace_null_enable_values(keep_enabled, &local_keep_enabled);
add_stdio_clocks(&local_keep_enabled);
prepare_for_clock_gating();
// gate clocks
clock_gate_sleep_en(&local_keep_enabled);
low_power_enable_processor_deep_sleep();
// Go to sleep until any event happens
__wfi();
low_power_disable_processor_deep_sleep();
post_clock_gating();
return 0;
}
// only the deep_sleep variant of this, as DORMANT cannot wake from TIMER
int low_power_sleep_until_timer(timer_hw_t *timer, absolute_time_t until,
const clock_dest_set_t *keep_enabled, bool exclusive) {

16
test/hello_sleep/hello_sleep_gpio.c
View file

@ -24,6 +24,13 @@ bool repeater(repeating_timer_t *timer) {
return true;
}
void chars_available_callback(__unused void *param) {
char buf[16] = {0};
while (stdio_get_until(buf, sizeof(buf), make_timeout_time_us(10)) > 0) {
printf("Chars available callback: %s\n", buf);
}
}
#if HAS_POWMAN_TIMER
static bool came_from_pstate = false;
static char powman_last_pwrup[100];
@ -61,6 +68,9 @@ int main() {
repeating_timer_t repeat;
add_repeating_timer_ms(500, repeater, NULL, &repeat);
// test stdio_set_chars_available_callback
stdio_set_chars_available_callback(chars_available_callback, NULL);
#if HAS_POWMAN_TIMER
if (came_from_pstate) {
printf("Came from powerup %s with (%s) memory kept on - skipping to end\n", powman_last_pwrup, powman_last_pstate);
@ -96,6 +106,12 @@ int main() {
printf("Doing %d second pause to prove timer running\n", SLEEP_TIME_S);
busy_wait_ms(SLEEP_TIME_MS);
printf("Going to sleep until any wakeup (expecting stdin characters)\n");
low_power_sleep_until_irq(NULL);
printf("Doing %d second pause to prove timer running\n", SLEEP_TIME_S);
busy_wait_ms(SLEEP_TIME_MS);
// todo, ah; we should start the aon timer; still have to decide what to do about keeping them in sync
start_time = get_absolute_time();
us_to_timespec(start_time, &ts);