ESP32_MirrorGPIOState.ino

#define GPIO_SENSOR_PIN GPIO_NUM_18  // GPIO pin connected to the sensor
#define RTC_GPIO_INDEX 18            // Serial.println(rtc_io_number_get(GPIO_SENSOR_PIN));

#define LED_PIN GPIO_NUM_13
#define LED_GPIO_INDEX 13

const ulp_insn_t ulp_program[] = {
  // Main loop
  M_LABEL(1),

  // Read GPIO18 state (bit 28) via RTC_GPIO_IN_REG
  I_RD_REG(RTC_GPIO_IN_REG, RTC_GPIO_INDEX + RTC_GPIO_IN_NEXT_S, RTC_GPIO_INDEX + RTC_GPIO_IN_NEXT_S),

  // If GPIO18 is HIGH, turn OFF the LED (connected to GPIO19)
  M_BG(2, 0),  // If R0 > 0 (GPIO18 is HIGH), branch to label 2

  // GPIO18 is LOW, turn ON the LED (connected to GPIO19, bit 19)
  I_WR_REG(RTC_GPIO_OUT_REG, LED_GPIO_INDEX + RTC_GPIO_OUT_DATA_S, LED_GPIO_INDEX + RTC_GPIO_OUT_DATA_S, 1),  // Set GPIO19 to HIGH (LED ON)
  M_BX(1),                                                                                                    // Loop back to label 1

  // Label 2: GPIO18 is HIGH, turn OFF the LED
  M_LABEL(2),
  I_WR_REG(RTC_GPIO_OUT_REG, LED_GPIO_INDEX + RTC_GPIO_OUT_DATA_S, LED_GPIO_INDEX + RTC_GPIO_OUT_DATA_S, 0),  // Set GPIO19 to LOW (LED OFF)
  M_BX(1),                                                                                                    // Loop back to label 1
};