LED is not blinking

[technical-publishing]

Hello there and thank you so much for your great library and work. I want to start playing around with the ULP copro and as a first step, I want to get the blinky example getting to run. I am working with micropython 1.18 on Heltec Wifi Kit32. On this board, the onboard LED is on GPIO25, so I have changed the definition to:

#define RTCIO_GPIO25_CHANNEL 6

If I start the program it will run without an error and I still can see the print output changing from 1 to 0 and vice versa, but the LED doesn´t light. Could you give me a hint, of what I am doing wrong?

Thanks in advance and best regards,
Werner

[wnienhaus]

I had a quick look and I have the feeling the PIN might not be in output mode.

This line sets the output mode: https://github.com/micropython/micropython-esp32-ulp/blob/master/examples/blink.py#L63

Did you change the RTC_IO_TOUCH_PAD2_REG and RTC_IO_TOUCH_PAD2_MUX_SEL_M appropriately? As per this mapping table, those constants need to be changed to RTC_IO_PAD_DAC1_REG and RTC_IO_PDAC1_MUX_SEL_M respectively (see comments at the end of each line of the table for the "normal" GPIO pin number for reference).

Give it a try. If that doesn't do it - I happen to have a "Heltek Wireless Stick", which also has its onboard LED on GPIO 25 / RTC 6, so I could test it on my board at some point.

[technical-publishing]

That`s exactly the point! Thanks a lot for your great support. I have changed the two definitions and now it works. Thanks again!

[wnienhaus]

Thanks for letting me know. I will try update the example file to better explain this for future users.