Can I measure battery level without any external components nrf51

RE: Can I measure battery level without any external components nrf51

Mikhail — Tue, 18 Apr 2017 14:29:26 GMT

yes, it is works. Thanks

RE: Can I measure battery level without any external components nrf51

Jørgen Holmefjord — Tue, 18 Apr 2017 11:27:00 GMT

Looks like it should work.

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 12:35:45 GMT

Looks work. code from here: developer.mbed.org/.../

void my_analogin_init(void)
{
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
                  (ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos) |
                  (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
                  (ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos) |
                  (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);

}

uint16_t my_analogin_read_u16(void)
{
NRF_ADC->CONFIG     &= ~ADC_CONFIG_PSEL_Msk;
NRF_ADC->CONFIG     |= ADC_CONFIG_PSEL_Disabled << ADC_CONFIG_PSEL_Pos;
NRF_ADC->TASKS_START = 1;
while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {};
return (uint16_t)NRF_ADC->RESULT; // 10 bit

}

is it correct settings for ADC for my case?

RE: Can I measure battery level without any external components nrf51

Jørgen Holmefjord — Wed, 12 Apr 2017 10:39:17 GMT

There was no ADC driver in SDK 9, this was first added in SDK 11. Only HAL driver is available. You need to add ADC driver from SDK 11 to SDK 9 (I think this should work without modifications), or migrate to at least SDK 11. You can also use the ADC HAL driver as shown in the ADC HAL example.

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 09:39:17 GMT

I tryed this example. Doesn't work on my SDK9. This example for SDK11. I mean than I can't compile

static nrf_drv_adc_channel_t adc_channel_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_2);

there is no

nrf_drv_adc_channel_t

struct in SDK9

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 08:35:04 GMT

I watched this post. Thanks. Wich one of examples? I suppose ble_app_hrs_adc_battery_measurement. I try to do it. Thanks.

RE: Can I measure battery level without any external components nrf51

awneil — Wed, 12 Apr 2017 08:20:45 GMT

devzone.nordicsemi.com/.../

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 08:03:16 GMT

I mean batt voltage.

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 08:01:30 GMT

in my same example on SDK9 I have next code

/**

@brief ADC initialization. */ void adc_config(void) { const nrf_adc_config_t nrf_adc_config = NRF_ADC_CONFIG_DEFAULT;

// Initialize and configure ADC nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config); nrf_adc_input_select(NRF_ADC_CONFIG_INPUT_2); nrf_adc_int_enable(ADC_INTENSET_END_Enabled << ADC_INTENSET_END_Pos); NVIC_SetPriority(ADC_IRQn, NRF_APP_PRIORITY_HIGH); NVIC_EnableIRQ(ADC_IRQn); }

As we see, it is no measure internal batt level by code:

nrf_adc_input_select(NRF_ADC_CONFIG_INPUT_2);

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 07:16:56 GMT

I readed all comments, but I can't follow to link above. It doesn't open. Relink pls.

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 07:15:33 GMT

I watched same example in SDK 9. But I can't see config of ADC for internal battery measure. Your link I can't open. Relink pls.

RE: Can I measure battery level without any external components nrf51

awneil — Wed, 12 Apr 2017 07:14:29 GMT

Did you actually read all the comments - and follow the link?

RE: Can I measure battery level without any external components nrf51

awneil — Wed, 12 Apr 2017 07:09:46 GMT

What do you mean by battery "level" ?

Note that battery voltage may not give any useful indication of the remaining battery life!

RE: Can I measure battery level without any external components nrf51

Mikhail — Wed, 12 Apr 2017 07:09:07 GMT

repeat what do You mean?

RE: Can I measure battery level without any external components nrf51

awneil — Wed, 12 Apr 2017 07:07:58 GMT

And, in particular, note that comment that measuring the battery voltage may not give any useful indication of the remaining battery life!

RE: Can I measure battery level without any external components nrf51

endnode — Tue, 11 Apr 2017 15:19:19 GMT

I see nRF51_SDK_9.0.0_2e23562.zip\examples\peripheral\adc_simple\ example, does it help?

RE: Can I measure battery level without any external components nrf51

Mikhail — Tue, 11 Apr 2017 15:01:58 GMT

Tnanks. But I still have question- how to init ADC in SDK9? As I understand, I should setting in function

nrf_adc_input_select()

transfer to it

NRF_ADC_CONFIG_SCALING_SUPPLY_ONE_THIRD

is it correct?

function nrf_adc_input_select()

__STATIC_INLINE void nrf_adc_input_select(nrf_adc_config_input_t input)
{
NRF_ADC->CONFIG =
    ((uint32_t)input << ADC_CONFIG_PSEL_Pos) | (NRF_ADC->CONFIG & ~ADC_CONFIG_PSEL_Msk);

if (input != NRF_ADC_CONFIG_INPUT_DISABLED)
{
    NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled << ADC_ENABLE_ENABLE_Pos;
}
else
{
    NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Disabled << ADC_ENABLE_ENABLE_Pos;
}

}

RE: Can I measure battery level without any external components nrf51

endnode — Tue, 11 Apr 2017 14:38:02 GMT

Read this.