/**
* @brief Timer0 interrupt handler.
*
* @param[in] event_type Timer event.
* @param[in] p_context General purpose parameter set during initialization of
* the timer. This parameter can be used to pass
* additional information to the handler function, for
* example, the timer ID.
*/
static void counter_compare_handler(nrf_timer_event_t event_type, void* p_context)
{
if(event_type == NRF_TIMER_EVENT_COMPARE0)
{
uint16_t val = nrf_drv_timer_capture_get(&m_timer1, NRF_TIMER_CC_CHANNEL1);
nrf_drv_timer_pause(&m_timer1);
nrf_drv_timer_clear(&m_timer1);
/* Handle finished measurement. */
conversion_handler(val);
}
}
/** @brief Function for initializing PPI used in infrared signal decoding
* The PPI is needed to convert the timer event into a task.
*/
uint32_t ir_ppi_init(void)
{
uint32_t gpiote_event_addr;
uint32_t timer_task_addr;
nrf_ppi_channel_t ppi_channel;
ret_code_t err_code;
nrf_drv_gpiote_in_config_t config;
config.sense = NRF_GPIOTE_POLARITY_HITOLO;
config.pull = NRF_GPIO_PIN_PULLUP;
config.hi_accuracy = false;
config.is_watcher = false;
nrf_drv_timer_config_t timer_config;
timer_config.frequency = NRF_TIMER_FREQ_1MHz;
timer_config.mode = NRF_TIMER_MODE_TIMER;
timer_config.bit_width = NRF_TIMER_BIT_WIDTH_32;
timer_config.interrupt_priority = 3;
err_code = nrf_drv_timer_init(&ir_timer, &timer_config, timer_dummy_handler);
APP_ERROR_CHECK(err_code);
// Set up GPIOTE
err_code = nrf_drv_gpiote_in_init(IR_RECEIVER_PIN_1, &config, ir_in_pin_handler);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_gpiote_in_init(IR_RECEIVER_PIN_2, &config, ir_in_pin_handler);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_gpiote_in_init(IR_RECEIVER_PIN_3, &config, ir_in_pin_handler);
APP_ERROR_CHECK(err_code);
// Set up timer for capturing
nrf_drv_timer_capture_get(&ir_timer, NRF_TIMER_CC_CHANNEL0);
// Set up PPI channel
err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);
APP_ERROR_CHECK(err_code);
timer_task_addr = nrf_drv_timer_capture_task_address_get(&ir_timer, NRF_TIMER_CC_CHANNEL0);
gpiote_event_addr = nrf_drv_gpiote_in_event_addr_get(IR_RECEIVER_PIN_1);
//err_code = nrf_drv_ppi_channel_assign(ppi_channel, gpiote_event_addr, timer_task_addr);
//APP_ERROR_CHECK(err_code);
//err_code = nrf_drv_ppi_channel_enable(ppi_channel);
//APP_ERROR_CHECK(err_code);
nrf_drv_gpiote_in_event_enable(IR_RECEIVER_PIN_1, true);
nrf_drv_gpiote_in_event_enable(IR_RECEIVER_PIN_2, true);
nrf_drv_gpiote_in_event_enable(IR_RECEIVER_PIN_3, true);
// Enable timer
nrf_drv_timer_enable(&ir_timer);
return 0;
}
