ESP32-S3 ADC1 drop down the voltage when read value (NuttX only)

[shizacat]

Hello!
Please help me. I don't understand what happen.
I'm reading the value from ADC1, but at the moment I'm trying to read the value, the voltage on the pin to be dropping.
Usage os NuttX: 12.7.0. On Arduino all work fine.

I tried to compare registers with arduino, but all same...

Board: ESP32-S3 devkit
OS: NuttX
adc mode: one short

Link on driver adc on nuttx: https://github.com/apache/nuttx/blob/ma ... 32s3_adc.c
I add only this code into 441 line (adc_samplecfg function):

Code: Untitled.c Select all

  /* Select RTC control */

  regval = getreg32(SENS_SAR_MEAS1_MUX_REG);

  regval &= ~(SENS_SAR1_DIG_FORCE_M);

  // regval |= (0 << SENS_SAR1_DIG_FORCE_S);  // 1: Select digital control; 0: Select RTC control.

  putreg32(regval, SENS_SAR_MEAS1_MUX_REG);

Output from console:

Code: Untitled.bsh Select all

nsh> adc -n 2

Sample:

1: channel: 0 value: 1727

Sample:

1: channel: 0 value: 1534