Hi!
I'm working with nrf51dk with s110 Soft Device. I need to read ADC every 2ms. In order to achieve that, i made timer with interrupt after 2ms. here is my code of initialising and starting timer, and timer interrupt handler:
#define ADC_SAMPLING_INTERVAL APP_TIMER_TICKS(2, APP_TIMER_PRESCALER)
//...
app_timer_id_t m_adc_sampling_timer_id;
//...
static void timers_init(void)
{
//...
err_code = app_timer_create(&m_adc_sampling_timer_id,
APP_TIMER_MODE_REPEATED,
adc_sampling_timeout_handler);
APP_ERROR_CHECK(err_code);
//...
}
//...
static void application_timers_start(void)
{
//...
err_code = app_timer_start(m_adc_sampling_timer_id, ADC_SAMPLING_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);
//...
}
//...
static void adc_sampling_timeout_handler(void * p_context)
{
uint32_t p_is_running = 0;
sd_clock_hfclk_request();
while(! p_is_running) //wait for the hfclk to be available
{
sd_clock_hfclk_is_running((&p_is_running));
}
NRF_ADC->TASKS_START = 1;
nrf_gpio_pin_toggle(LED_2);
}
as You see, i toggle led2 at the end, to make sure that application gets to this point, and it does, so i assume that adc->start instruction is executed. but application never gets into ADC_IRQHandler. here is my initialization of ADC:
void adc_init()
{
/* Enable interrupt on ADC sample ready event*/
NRF_ADC->INTENSET = ADC_INTENSET_END_Msk;
sd_nvic_SetPriority(ADC_IRQn, NRF_APP_PRIORITY_LOW);
sd_nvic_EnableIRQ(ADC_IRQn);
NRF_ADC->CONFIG = (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos)
| (ADC_CONFIG_PSEL_AnalogInput0 << ADC_CONFIG_PSEL_Pos)
| (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos)
| (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos)
| (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos);
/* Enable ADC*/
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
}
I looked at a lot of examples with adc and i still cant figure out what is wrong with my code. I would apreciate any advice on what could be wrong.
best regards, Ina
