shizacat opened a new issue, #14816:
URL: https://github.com/apache/nuttx/issues/14816
### Description
Hello. I trying to read value from ADC, but have something problem.
1) Added this code, without it don't get anything. It always returns the
same value, regardless of the applied voltage to the pin.
```
/* 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);
```
in here:
https://github.com/apache/nuttx/blob/master/arch/xtensa/src/esp32s3/esp32s3_adc.c#L441
2) After, I got the value from ADC, but happed something strange, the
voltage on pin drop down.
I understand what happen. Please help!
Board: ESP32-S3 dev kit
Board connect
The voltage on pin before read.
The voltage on pin after read.
Configuration: ./tools/configure.sh -m esp32s3-devkit:adc
Console
```
# on pin 3V before read
nsh> adc -n 2
Sample:
1: channel: 0 value: 1727
Sample:
1: channel: 0 value: 1534
nsh>
```
### Verification
- [X] I have verified before submitting the report.
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