It works! Thank you so so much boarchuz, my project is finally back on track. And I think all of this information might be relevant to others as well.

Thanks, I tried it but it only has the effect that when the ULP program crashes, it consumes about 1.5 mA instead of 200 µA before. I have added reading the modified registers on the ULP and writing the values:

Main processor:

#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include ...

Thank you so much boarchuz, that is the first step forward so far. I can reproduce the result, that adding

void esp_sleep_enable_adc_tsens_monitor(bool enable);
esp_sleep_enable_adc_tsens_monitor(false);

before esp_deep_sleep_start() does drop the current from about 50 µA to about 9 µA, which ...

I tried to follow the approach of undoing everything that the ulp_adc_init() does. I went through the code and found that all registers that are modified are in rtc_io_reg.h, rtc_cntl_reg.h and sens_reg.h. I then modified my code to just read all registers in these files before and after ulp_adc ...

Thank you, I appreciate any feedback. I'm not sure I quite understand. Could you be more specific about what you mean, what race conditions you see and what I should change in the example code? Should we maybe move forward with just one of the ULPs? FSM always had lower currents than RISCV, so I ...

Any news on this?

Sure, this is the code for RISCV.

Main Processor:

#include <stdio.h>
#include <inttypes.h>
#include "esp_sleep.h"
#include "ulp_riscv.h"
#include "ulp_adc.h"
#include "ulp_main.h"
#include "ulp/example_config.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

extern const uint8_t ulp ...

So I have updated to the current ESP-IDF 5.4 and started using Visual Studio Code. I have run the ULP ADC examples for both FSM and RISCV, also modifying each one with the previously discussed statements to disable the ADC from ULP. The result: In all cases the consumption is still around 50 µA ...

Ok, so I looked into this more and came up with the following lines to disable the ADC from ULP.


WRITE_RTC_REG(SENS_SAR_PERI_CLK_GATE_CONF_REG, SENS_SARADC_CLK_EN_S, 1, 0)
WRITE_RTC_REG(SENS_SAR_PERI_CLK_GATE_CONF_REG, SENS_IOMUX_CLK_EN_S, 1, 0)
WRITE_RTC_REG(SENS_SAR_POWER_XPD_SAR_REG, SENS ...

Sorry, I forgot to mention that I am using ULP-FSM not RISCV. Is the same possible there?