auracaster/hci_uart_iso_timesync
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Implement logic to setup SDU Sync Ref (high) and Audio Out (low) ISR

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This commit is contained in:
Matthias Ringwald
2024-11-27 12:23:42 +01:00
parent 9d82bf91e3
commit 1189945df0
1 changed files with 43 additions and 13 deletions
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56
src/main.c
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@@ -473,7 +473,7 @@ static uint32_t toggle_and_get_time(void) {
#endif
#define TIME_TO_WAIT_MS 1000
#define PRESENTATION_TIME_US 10000
#define SYNC_TOGGLE_TIMER_INSTANCE_NUMBER 2
static const nrfx_timer_t sync_toggle_timer_instance =
NRFX_TIMER_INSTANCE(SYNC_TOGGLE_TIMER_INSTANCE_NUMBER);
@@ -484,35 +484,65 @@ static nrfx_timer_config_t cfg = {.frequency = NRFX_MHZ_TO_HZ(1UL),
.interrupt_priority = NRFX_TIMER_DEFAULT_CONFIG_IRQ_PRIORITY,
.p_context = NULL};
static enum {
ALTERNATE_TOGGLE_STATE_IDLE,
ALTERNATE_TOGGLE_STATE_W4_SDU_SYNC_REF,
ALTERNATE_TOGGLE_STATE_W4_AUDIO_OUT
} alternate_toggle_state = ALTERNATE_TOGGLE_STATE_IDLE;
static void sync_toggle_timer_isr_handler(nrf_timer_event_t event_type, void *p_context){
ARG_UNUSED(p_context);
if(event_type == NRF_TIMER_EVENT_COMPARE1)
{
uint32_t remainder_us = nrf_timer_cc_get(NRF_TIMER2, NRF_TIMER_CC_CHANNEL1);
gpio_pin_toggle_dt( &alternate_toggle_pin );
LOG_INF("HS Timer: %d", remainder_us );
uint32_t next_timeout_ticks = remainder_us + nrfx_timer_ms_to_ticks(&sync_toggle_timer_instance, TIME_TO_WAIT_MS);
nrfx_timer_compare(&sync_toggle_timer_instance, NRF_TIMER_CC_CHANNEL1, next_timeout_ticks, true);
if(event_type == NRF_TIMER_EVENT_COMPARE1){
uint32_t capture_time_us = nrf_timer_cc_get(NRF_TIMER2, NRF_TIMER_CC_CHANNEL1);
switch (alternate_toggle_state) {
case ALTERNATE_TOGGLE_STATE_W4_SDU_SYNC_REF:
alternate_toggle_state = ALTERNATE_TOGGLE_STATE_W4_AUDIO_OUT;
gpio_pin_set_dt(&alternate_toggle_pin, 1);
uint32_t audio_out_us = capture_time_us + PRESENTATION_TIME_US;
nrfx_timer_compare(&sync_toggle_timer_instance, NRF_TIMER_CC_CHANNEL1, audio_out_us, true);
LOG_INF("SDU Sync Ref: %d", capture_time_us);
break;
case ALTERNATE_TOGGLE_STATE_W4_AUDIO_OUT:
alternate_toggle_state = ALTERNATE_TOGGLE_STATE_W4_AUDIO_OUT;
gpio_pin_set_dt(&alternate_toggle_pin, 0);
LOG_INF("Audio Out: %d", capture_time_us);
break;
default:
__ASSERT(0, "Unknown state");
break;
}
}
}
static void setup_sdu_sync_to_audio_out_timer(uint32_t delay_us) {
nrf_timer_cc_set(NRF_TIMER2, NRF_TIMER_CC_CHANNEL1, 0);
nrf_timer_task_trigger(NRF_TIMER2, nrf_timer_capture_task_get(NRF_TIMER_CC_CHANNEL1));
uint32_t current_time_us = nrf_timer_cc_get(NRF_TIMER2, NRF_TIMER_CC_CHANNEL1);
while (current_time_us == 0) {
current_time_us = nrf_timer_cc_get(NRF_TIMER2, NRF_TIMER_CC_CHANNEL1);
}
uint32_t sdu_sync_ref_us = current_time_us + delay_us;
LOG_INF("TOGGLE TIMER now %u, sdu_sync_ref %u", current_time_us, sdu_sync_ref_us);
nrfx_timer_compare(&sync_toggle_timer_instance, NRF_TIMER_CC_CHANNEL1, sdu_sync_ref_us, true);
alternate_toggle_state = ALTERNATE_TOGGLE_STATE_W4_SDU_SYNC_REF;
}
int main(void)
{
// timer setup
// toggle timer setup
nrfx_err_t ret;
ret = nrfx_timer_init(&sync_toggle_timer_instance, &cfg, sync_toggle_timer_isr_handler);
if (ret - NRFX_ERROR_BASE_NUM) {
LOG_ERR("nrfx timer init error: %d", ret);
return -ENODEV;
}
uint32_t desired_ticks = nrfx_timer_ms_to_ticks(&sync_toggle_timer_instance, TIME_TO_WAIT_MS);
nrfx_timer_compare(&sync_toggle_timer_instance, NRF_TIMER_CC_CHANNEL1, desired_ticks, true);
IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_TIMER_INST_GET(SYNC_TOGGLE_TIMER_INSTANCE_NUMBER)), IRQ_PRIO_LOWEST,
NRFX_TIMER_INST_HANDLER_GET(SYNC_TOGGLE_TIMER_INSTANCE_NUMBER), 0, 0);
nrfx_timer_enable(&sync_toggle_timer_instance);
alternate_toggle_state = ALTERNATE_TOGGLE_STATE_IDLE;
// simulate received packet
setup_sdu_sync_to_audio_out_timer(100000);
/* incoming events and data from the controller */
static K_FIFO_DEFINE(rx_queue);