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: [Select all] [Expand/Collapse]

1.   /* Select RTC control */
2.   regval = getreg32(SENS_SAR_MEAS1_MUX_REG);
3.   regval &= ~(SENS_SAR1_DIG_FORCE_M);
4.   // regval |= (0 << SENS_SAR1_DIG_FORCE_S);  // 1: Select digital control; 0: Select RTC control.
5.   putreg32(regval, SENS_SAR_MEAS1_MUX_REG);

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Output from console:

Code: [Select all] [Expand/Collapse]

1. nsh> adc -n 2
2. Sample:
3. 1: channel: 0 value: 1727
4. Sample:
5. 1: channel: 0 value: 1534

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