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;
}
void nrf_drv_timer_compare_int_enable(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_event_clear(p_instance->p_reg,
nrf_timer_compare_event_get(channel));
nrf_timer_int_enable(p_instance->p_reg,
nrf_timer_compare_int_get(channel));
}
ret_code_t nrf_drv_timer_init(nrf_drv_timer_t const * const p_instance,
nrf_drv_timer_config_t const * p_config,
nrf_timer_event_handler_t timer_event_handler)
{
timer_control_block_t * p_cb = &m_cb[p_instance->instance_id];
#ifdef SOFTDEVICE_PRESENT
ASSERT(p_instance->p_reg != NRF_TIMER0);
ASSERT(p_config);
#endif
if (p_cb->state != NRF_DRV_STATE_UNINITIALIZED)
{
return NRF_ERROR_INVALID_STATE;
}
if (timer_event_handler == NULL)
{
return NRF_ERROR_INVALID_PARAM;
}
/* Warning 685: Relational operator '<=' always evaluates to 'true'"
* Warning in NRF_TIMER_IS_BIT_WIDTH_VALID macro. Macro validate timers resolution.
* Not necessary in nRF52 based systems. Obligatory in nRF51 based systems.
*/
/*lint -save -e685 */
ASSERT(NRF_TIMER_IS_BIT_WIDTH_VALID(p_instance->p_reg, p_config->bit_width));
//lint -restore
p_cb->handler = timer_event_handler;
p_cb->context = p_config->p_context;
uint8_t i;
for (i = 0; i < p_instance->cc_channel_count; ++i)
{
nrf_timer_event_clear(p_instance->p_reg,
nrf_timer_compare_event_get(i));
}
nrf_drv_common_irq_enable(nrf_drv_get_IRQn(p_instance->p_reg),
p_config->interrupt_priority);
nrf_timer_mode_set(p_instance->p_reg, p_config->mode);
nrf_timer_bit_width_set(p_instance->p_reg, p_config->bit_width);
nrf_timer_frequency_set(p_instance->p_reg, p_config->frequency);
p_cb->state = NRF_DRV_STATE_INITIALIZED;
return NRF_SUCCESS;
}
/**
* @brief This function is generic interrupt handler
*
* @param[in] p_reg pointer to timer registers
* @param[in] timer_id specifies the timer id
*
* @return NRF_SUCCESS on success, otherwise an error code.
*/
static void nrf_drv_timer_interrupt_handle(NRF_TIMER_Type * p_reg, uint32_t timer_id)
{
uint32_t i;
for(i=0; i<TIMER_CHANNEL_NUMBER; i++)
{
nrf_timer_events_t event = (nrf_timer_events_t)((uint32_t)NRF_TIMER_EVENTS_COMPARE0 + (i*sizeof(uint32_t)));
if (nrf_timer_event_check(p_reg, event) && nrf_timer_int_enable_check(p_reg, (nrf_timer_int_mask_t)((uint32_t)NRF_TIMER_INT_COMPARE0_MASK << i)))
{
nrf_timer_event_clear(p_reg, event);
(m_timer_event_handlers[timer_id])(event);
}
}
}
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();
}
ret_code_t nrf_drv_timer_init(nrf_drv_timer_t const * const p_instance,
nrf_drv_timer_config_t const * p_config,
nrf_timer_event_handler_t timer_event_handler)
{
timer_control_block_t * p_cb = &m_cb[p_instance->instance_id];
#ifdef SOFTDEVICE_PRESENT
ASSERT(p_instance->p_reg != NRF_TIMER0);
#endif
ASSERT(NRF_TIMER_IS_BIT_WIDTH_VALID(p_instance->p_reg, p_config->bit_width));
if (p_cb->state != NRF_DRV_STATE_UNINITIALIZED)
{
return NRF_ERROR_INVALID_STATE;
}
if (timer_event_handler == NULL)
{
return NRF_ERROR_INVALID_PARAM;
}
if (p_config == NULL)
{
p_config = &m_default_config[p_instance->instance_id];
}
p_cb->handler = timer_event_handler;
p_cb->context = p_config->p_context;
uint8_t i;
for (i = 0; i < p_instance->cc_channel_count; ++i)
{
nrf_timer_event_clear(p_instance->p_reg,
nrf_timer_compare_event_get(i));
}
nrf_drv_common_irq_enable(nrf_drv_get_IRQn(p_instance->p_reg),
p_config->interrupt_priority);
nrf_timer_mode_set(p_instance->p_reg, p_config->mode);
nrf_timer_bit_width_set(p_instance->p_reg, p_config->bit_width);
nrf_timer_frequency_set(p_instance->p_reg, p_config->frequency);
p_cb->state = NRF_DRV_STATE_INITIALIZED;
return NRF_SUCCESS;
}
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 TIMER1_IRQHandler(void) {
nrf_timer_task_trigger(NRF_TIMER1, NRF_TIMER_TASK_CLEAR);
nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
jstUtilTimerInterruptHandler();
}
ret_code_t nrf_drv_timer_init(nrf_drv_timer_t const * const p_instance,
nrf_drv_timer_config_t const * p_config,
nrf_timer_event_handler_t timer_event_handler)
{
timer_control_block_t * p_cb = &m_cb[p_instance->instance_id];
ASSERT(((p_instance->p_reg == NRF_TIMER0) && TIMER0_ENABLED) || (p_instance->p_reg != NRF_TIMER0));
ASSERT(((p_instance->p_reg == NRF_TIMER1) && TIMER1_ENABLED) || (p_instance->p_reg != NRF_TIMER1));
ASSERT(((p_instance->p_reg == NRF_TIMER2) && TIMER2_ENABLED) || (p_instance->p_reg != NRF_TIMER2));
#if TIMER_COUNT == 5
ASSERT(((p_instance->p_reg == NRF_TIMER3) && TIMER3_ENABLED) || (p_instance->p_reg != NRF_TIMER3));
ASSERT(((p_instance->p_reg == NRF_TIMER4) && TIMER4_ENABLED) || (p_instance->p_reg != NRF_TIMER4));
#endif //TIMER_COUNT
#ifdef SOFTDEVICE_PRESENT
ASSERT(p_instance->p_reg != NRF_TIMER0);
ASSERT(p_config);
#endif
ret_code_t err_code;
if (p_cb->state != NRF_DRV_STATE_UNINITIALIZED)
{
err_code = NRF_ERROR_INVALID_STATE;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
return err_code;
}
if (timer_event_handler == NULL)
{
err_code = NRF_ERROR_INVALID_PARAM;
NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
return err_code;
}
/* Warning 685: Relational operator '<=' always evaluates to 'true'"
* Warning in NRF_TIMER_IS_BIT_WIDTH_VALID macro. Macro validate timers resolution.
* Not necessary in nRF52 based systems. Obligatory in nRF51 based systems.
*/
/*lint -save -e685 */
ASSERT(NRF_TIMER_IS_BIT_WIDTH_VALID(p_instance->p_reg, p_config->bit_width));
//lint -restore
p_cb->handler = timer_event_handler;
p_cb->context = p_config->p_context;
uint8_t i;
for (i = 0; i < p_instance->cc_channel_count; ++i)
{
nrf_timer_event_clear(p_instance->p_reg,
nrf_timer_compare_event_get(i));
}
nrf_drv_common_irq_enable(nrf_drv_get_IRQn(p_instance->p_reg),
p_config->interrupt_priority);
nrf_timer_mode_set(p_instance->p_reg, p_config->mode);
nrf_timer_bit_width_set(p_instance->p_reg, p_config->bit_width);
nrf_timer_frequency_set(p_instance->p_reg, p_config->frequency);
p_cb->state = NRF_DRV_STATE_INITIALIZED;
err_code = NRF_SUCCESS;
NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
return err_code;
}
void us_ticker_clear_interrupt(void)
{
nrf_timer_event_clear(NRF_TIMER1, NRF_TIMER_EVENT_COMPARE0);
}
