ON NCS SDK 2.7.0 version, how to calibrate SAADC?
I checked below code, I see that "Perform calibration before the reading is taken if requested.", it will trigger calibration before each reading?
struct adc_sequence {
/**
* Pointer to a structure defining additional options for the sequence.
* If NULL, the sequence consists of a single sampling.
*/
const struct adc_sequence_options *options;
/**
* Bit-mask indicating the channels to be included in each sampling
* of this sequence.
* All selected channels must be configured with adc_channel_setup()
* before they are used in a sequence.
* The least significant bit corresponds to channel 0.
*/
uint32_t channels;
/**
* Pointer to a buffer where the samples are to be written. Samples
* from subsequent samplings are written sequentially in the buffer.
* The number of samples written for each sampling is determined by
* the number of channels selected in the "channels" field.
* The values written to the buffer represent a sample from each
* selected channel starting from the one with the lowest ID.
* The buffer must be of an appropriate size, taking into account
* the number of selected channels and the ADC resolution used,
* as well as the number of samplings contained in the sequence.
*/
void *buffer;
/**
* Specifies the actual size of the buffer pointed by the "buffer"
* field (in bytes). The driver must ensure that samples are not
* written beyond the limit and it must return an error if the buffer
* turns out to be not large enough to hold all the requested samples.
*/
size_t buffer_size;
/**
* ADC resolution.
* For single-ended channels the sample values are from range:
* 0 .. 2^resolution - 1,
* for differential ones:
* - 2^(resolution-1) .. 2^(resolution-1) - 1.
*/
uint8_t resolution;
/**
* Oversampling setting.
* Each sample is averaged from 2^oversampling conversion results.
* This feature may be unsupported by a given ADC hardware, or in
* a specific mode (e.g. when sampling multiple channels).
*/
uint8_t oversampling;
/**
* Perform calibration before the reading is taken if requested.
*
* The impact of channel configuration on the calibration
* process is specific to the underlying hardware. ADC
* implementations that do not support calibration should
* ignore this flag.
*/
bool calibrate;
};
