DOUBT IN ADC CONFIGURATION

[NANDHU]

HI ,

•  I want to configure P0.02  as an adc channel .
•  I also want to read the adc value from P0.02 at regular intervals.
•  For regular intervals i will put a timer and inside the timer handler function i will call the function for reading adc value .

My doubts

1. which  are function using to configure or initializing  the adc ?
2. which function is using  for  read the the adc value?

SDK i am using "nRF5_SDK_14.2.0_17b948a".

I am configuring  adc for battery level detection .

Please answer to  1 and 2

[awneil]

NANDHU said:

SDK i am using "nRF5_SDK_14.2.0_17b948a

Why are you using an old SDK ?

Have you looked at the SAADC example in the SDK ?

[NANDHU]

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.
• awneil said:

  Have you looked at the SAADC example in the SDK ?
• 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);

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

1. Is the above function if  enough for intilization?
2. 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.

[awneil]

NANDHU said:

i looked it

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

How to properly post source code:

[NANDHU]

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 

[Simon]

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