RE: BLE + ADC + optimisation level

Stefan Birnir Sverrisson — Mon, 07 Sep 2015 15:35:42 GMT

Thank you for your question

I see that you initialize a pin as output in your initialization routine, but you do it again in your second code block. You should only initialize the pin once. You should also enable the ADC only once.

RE: BLE + ADC + optimisation level

jane_raid — Fri, 04 Sep 2015 14:32:27 GMT

This is an initialisation of ADC:

    nrf_gpio_cfg_output(PIN_BATTERY_CHARGE_ON);
nrf_gpio_pin_set(PIN_BATTERY_CHARGE_ON);

/* 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_AnalogInput6 << ADC_CONFIG_PSEL_Pos)	| (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos)		| (ADC_CONFIG_INPSEL_AnalogInputTwoThirdsPrescaling << ADC_CONFIG_INPSEL_Pos) | (ADC_CONFIG_RES_8bit << ADC_CONFIG_RES_Pos);			

/* Enable ADC*/
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;

and this is a place when I'm try to get a data from ADC

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_gpio_cfg_output(PIN_BATTERY_CHARGE_ON);
nrf_gpio_pin_set(PIN_BATTERY_CHARGE_ON);

NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
NRF_ADC->TASKS_START = 1;							//Start ADC sampling



while (NRF_ADC->EVENTS_END == 0);

}

It's run on while (NRF_ADC->EVENTS_END == 0); again and again and in some runs go to HardFaultHandler

RE: BLE + ADC + optimisation level

Wojtek — Fri, 04 Sep 2015 13:43:40 GMT

Are you using ADC driver from SDK? Please provide us some code that causes the issue.