DOUBT IN ADC CONFIGURATION

RE: DOUBT IN ADC CONFIGURATION

NANDHU — Wed, 03 Jul 2019 16:45:01 GMT

Hi Simon

In the adc init function nrf_drv_saadc_buffer_convert() is calling twice . Can explain why these function is calling in the init part.

Is it for assigning the buffer for storing adc value?
When the code execution is entering to saadc_callback().Is it entering to saadc_callback() after calling "nrf_drv_saadc_sample " function or "nrf_drv_saadc_sample_task_get" function

RE: DOUBT IN ADC CONFIGURATION

Simon — Tue, 02 Jul 2019 15:39:43 GMT

Take a look at the saadc_callback(), the SAADC input data can be found in p_event->data.done.p_buffer[] (after nrf_drv_saadc_buffer_convert() is called)

Best regards,

Simon

RE: DOUBT IN ADC CONFIGURATION

NANDHU — Tue, 02 Jul 2019 10:49:07 GMT

Hi awneil

I just want to known from where or using which function we get the adc value.

The converted analog to digital value is storing to where and from where we can read it ?just tell me that

RE: DOUBT IN ADC CONFIGURATION

awneil — Tue, 02 Jul 2019 10:43:20 GMT

[quote userid="76730" url="~/f/nordic-q-a/49242/doubt-in-adc-configuration/195934"]i looked it[/quote]

Don't just look it - build it, run it, and see what it does!

How to properly post source code:

RE: DOUBT IN ADC CONFIGURATION

NANDHU — Tue, 02 Jul 2019 10:39:18 GMT

HI,

Actually our product is 2d-3d combinational mouse .

so we are using "ble_app_hids_mouse" application from nRF5_SDK_14.2.0_17b948a
so i want to configure the adc to it.
[quote userid="6462" url="~/f/nordic-q-a/49242/doubt-in-adc-configuration/195930"]Have you looked at the SAADC example in the SDK ?[/quote]
yes i looked it

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void saadc_init(void)
{
ret_code_t err_code;
nrf_saadc_channel_config_t channel_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);

err_code = nrf_drv_saadc_init(NULL, saadc_callback);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_channel_init(0, &channel_config);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Is the above function if enough for intilization?
How we can read the adc value which function is using for it . I didn't saw any function which returns converted adc value . please help me.

RE: DOUBT IN ADC CONFIGURATION

awneil — Tue, 02 Jul 2019 10:29:29 GMT

[quote userid="76730" url="~/f/nordic-q-a/49242/doubt-in-adc-configuration"]SDK i am using "nRF5_SDK_14.2.0_17b948a[/quote]

Why are you using an old SDK ?

Have you looked at the SAADC example in the SDK ?