I was a complete fool, yes the code is not identical and it does work as intended.

static inline void ulp_riscv_gpio_output_level(gpio_num_t gpio_num, uint8_t level) { if (level) { REG_SET_FIELD(RTC_GPIO_OUT_W1TS_REG, RTC_GPIO_OUT_DATA_W1TS, BIT(gpio_num)); } else { REG_SET_FIELD(RTC_GPIO_OUT_W1TC_REG, RTC_GPIO_OUT_DATA_W1TS, BIT(gpio_num)); } } Code for if(level) and else is ide...

Finally I got it working and I blame poor documentation for my problem. Looking how the RiskV ULP initializes the rtc i2c I found this: /* For esp32s3, we need to enable the rtc_i2c clock gate before accessing rtc i2c registers */ SET_PERI_REG_MASK(SENS_SAR_PERI_CLK_GATE_CONF_REG, SENS_RTC_I2C_CLK_E...

Use neither as both are bloated. I use geany which works nicely.
If you want I post the Geany configuration I use.

#include <stdio.h> #include <stdlib.h> #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #define TAG "test_write_rtc_reg.c" #if ESP_IDF_VERSION_MAJOR < 5 #include "driver/rtc_cntl.h" #else #include "esp_private/rtc_ctrl.h" #endif #include "driver/rtc_io.h" #include "soc/...

Thank you for answering that quickly. What you said makes a lot of sense, however I can
use the RTC GPIO without any problems. How can I turn the RTC power domain on or off to
double check?

I want to initialize the RTC I2C controller using the main processor of the ESP32-S3 As en example setting RTC_I2C_SCL_LOW_REG SET_PERI_REG_BITS(RTC_I2C_SCL_LOW_REG, RTC_I2C_SCL_LOW_PERIOD_REG, 40, RTC_I2C_SCL_LOW_PERIOD_REG_S); // SCL low/high period = 40, which result driving SCL with 100kHz. ESP_...

i was able to fix that myself.
The working code is here:
https://github.com/cbaurtx/ESP32_keypad_rotdecode

I did some digging...
It seems that the command ulp_embed_binary creates executables only. So no code for libraries

That was the wrong example (ULP and not a custom component)
So here you go....