void us_ticker_set_interrupt(timestamp_t timestamp)
{
core_util_critical_section_enter();
const uint32_t counter_mask = ((1ULL << US_TICKER_COUNTER_BITS) - 1);
nrf_timer_cc_write(NRF_TIMER1, NRF_TIMER_CC_CHANNEL0, timestamp & counter_mask);
if (!nrf_timer_int_enable_check(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0))) {
nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
nrf_timer_int_enable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
}
core_util_critical_section_exit();
}
void us_ticker_free(void)
{
nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_STOP);
nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
us_ticker_initialized = false;
}
void nrf_drv_timer_compare_int_disable(nrf_drv_timer_t const * const p_instance,
uint32_t channel)
{
ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);
ASSERT(channel < p_instance->cc_channel_count);
nrf_timer_int_disable(p_instance->p_reg,
nrf_timer_compare_int_get(channel));
}
void us_ticker_init(void)
{
if (us_ticker_initialized) {
nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
return;
}
nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_STOP);
nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
/* Configure timer as follows:
* - timer mode,
* - timer width 16 bits for NRF51 and 32 bits for NRF52,
* - timer freq 1 MHz.
*/
nrf_timer_mode_set(NRF_TIMER1, NRF_TIMER_MODE_TIMER);
nrf_timer_frequency_set(NRF_TIMER1, NRF_TIMER_FREQ_1MHz);
#ifdef NRF52
nrf_timer_bit_width_set(NRF_TIMER1, NRF_TIMER_BIT_WIDTH_32);
#else
nrf_timer_bit_width_set(NRF_TIMER1, NRF_TIMER_BIT_WIDTH_16);
#endif
nrf_timer_cc_write(NRF_TIMER1, NRF_TIMER_CC_CHANNEL0, 0);
nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
NVIC_SetVector(TIMER1_IRQn, (uint32_t)us_ticker_irq_handler);
nrf_drv_common_irq_enable(TIMER1_IRQn, APP_IRQ_PRIORITY_HIGH);
nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_START);
/* Bug fix. First value can't be trusted. */
nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_CAPTURE1);
us_ticker_initialized = true;
}
static void irq_handler(NRF_TIMER_Type * p_reg,
timer_control_block_t * p_cb,
uint8_t channel_count)
{
uint8_t i;
for (i = 0; i < channel_count; ++i)
{
nrf_timer_event_t event = nrf_timer_compare_event_get(i);
nrf_timer_int_mask_t int_mask = nrf_timer_compare_int_get(i);
if (nrf_timer_event_check(p_reg, event) &&
nrf_timer_int_enable_check(p_reg, int_mask))
{
nrf_timer_event_clear(p_reg, event);
p_cb->handler(event, p_cb->context);
}
}
}
void nrf_drv_timer_compare(nrf_drv_timer_t const * const p_instance,
nrf_timer_cc_channel_t cc_channel,
uint32_t cc_value,
bool enable_int)
{
nrf_timer_int_mask_t timer_int = nrf_timer_compare_int_get(cc_channel);
if (enable_int)
{
nrf_timer_int_enable(p_instance->p_reg, timer_int);
}
else
{
nrf_timer_int_disable(p_instance->p_reg, timer_int);
}
nrf_timer_cc_write(p_instance->p_reg, cc_channel, cc_value);
}
void nrf_drv_timer_compare(nrf_drv_timer_t const * const p_instance,
nrf_timer_cc_channel_t cc_channel,
uint32_t cc_value,
bool enable_int)
{
nrf_timer_int_mask_t timer_int = nrf_timer_compare_int_get(cc_channel);
if (enable_int)
{
nrf_timer_int_enable(p_instance->p_reg, timer_int);
}
else
{
nrf_timer_int_disable(p_instance->p_reg, timer_int);
}
nrf_timer_cc_write(p_instance->p_reg, cc_channel, cc_value);
NRF_LOG_INFO("Timer id: %d, capture value set: %d, channel: %d.\r\n", p_instance->instance_id, cc_value, cc_channel);
}
void us_ticker_disable_interrupt(void)
{
nrf_timer_int_disable(NRF_TIMER1, nrf_timer_compare_int_get(NRF_TIMER_CC_CHANNEL0));
}