Setting and resetting pin state in ULP mode does not work

[NikolaRistic]

I am relatively new to programming the ESP32. Currently, I am trying to toggle GPIO pin number 25 in the ULP mode (RTC IO pin 6), but I am failing. It would help me a lot if someone pointed out my mistakes.

In the main program, I initialize the gpio pin 25 as an output pin and enter the ULP mode.
The cycle time of the ULP is 1 second.
The assembly code that runs in the ULP mode is given below.

Code: Select all

#include "soc/rtc_cntl_reg.h"
#include "soc/rtc_io_reg.h"
#include "soc/soc_ulp.h"

    /* Define variables, which go into .bss section (zero-initialized data) */
    .bss
    .global pinState
pinState:
    .long 0

    /* Code goes into .text section */
    .text
    .global entry
entry:

    /* Check current pin state */

    move r2, pinState
    ld   r1, r2, 0
    add  r1, r1, 1
    st   r1, r2, 0

    and r1, r1, 1

    jump reset_pin, eq

    jump set_pin

set_pin:

    WRITE_RTC_REG(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_HOLD_S, 1, 0)
    WRITE_RTC_REG(RTC_GPIO_OUT_W1TS_REG,RTC_GPIO_OUT_DATA_W1TS_S + 6, 1, 1)
    WRITE_RTC_REG(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_HOLD_S, 1, 1)

    jump wake_up

reset_pin:

    WRITE_RTC_REG(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_HOLD_S, 1, 0)
    WRITE_RTC_REG(RTC_GPIO_OUT_W1TS_REG,RTC_GPIO_OUT_DATA_W1TS_S + 6, 1, 0)
    WRITE_RTC_REG(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_HOLD_S, 1, 1)
	
    jump wake_up

wake_up:
	
    /* Check if the system can be woken up */
    READ_RTC_FIELD(RTC_CNTL_LOW_POWER_ST_REG, RTC_CNTL_RDY_FOR_WAKEUP)
    and r0, r0, 1
    jump wake_up, eq

    /* Wake up the SoC, end program */
    wake 
    halt

Thank you for your time.