Hello Everyone
I am using two application timers one of standard battery service and one i have made for adc sampling like this along with the code added for battery timers
timers_init()
{
....
err_code = app_timer_create(&m_adc_sampling_timer_id,
APP_TIMER_MODE_REPEATED,
adc_sampling_timeout_handler);
}
application_timers_start()
{
...
err_code = app_timer_start(m_adc_sampling_timer_id, ADC_SAMPLING_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);
}
my ADC_SAMPLING_INTERVAL is set for 5 seconds and battery sampling is set for 2 seconds. whenever adc sampling timer is out ... it will trigger for adc sampling
void adc_sampling_timeout_handler(void * p_context)
{
UNUSED_PARAMETER(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; /** Start ADC sampling */
}
this will call ADC IRQ
void ADC_IRQHandler(void)
{
static uint8_t adc_count = 0;
/* Clear dataready event */
NRF_ADC->EVENTS_END = 0;
battery_values[adc_count] = NRF_ADC->RESULT;
if(adc_count > 4)
{
current_battery_value = (battery_values[0] + battery_values[1] + battery_values[2] + battery_values[3] + battery_values[4]) / MAX_ADC_SAMPLES;
memset(battery_values,0,sizeof(battery_values));
simple_uart_put(current_battery_value);
adc_count = 0;
}
else
{
simple_uart_put(battery_values[adc_count]);
simple_uart_put(adc_count);
adc_count++;
}
NRF_ADC->TASKS_STOP = 1;
//Release the external crystal
sd_clock_hfclk_release();
}
As shown in the above code it will take 5 samples and average it. each samples shud be taken at the interval of 5 seconds . but in my case 1st sample is taken at the interval of 5 seconds, at another 5 seconds 2nd and 3rd sample are taken together then 4th sample at 5 seconds of interval then again 5th and final sample is taken together at the interval of 5 seconds. which is not what i want each sample shud be taken at the interval of 5 second. can anybody tell me what can be the problem.
Regards Asma
