8000 Disabling USB_SERIAL_JTAG on esp32c3 to free up the pins. · Issue #16414 · micropython/micropython · GitHub
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Disabling USB_SERIAL_JTAG on esp32c3 to free up the pins. #16414

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JustDr00py opened this issue Dec 14, 2024 · 2 comments · Fixed by #16236
Closed

Disabling USB_SERIAL_JTAG on esp32c3 to free up the pins. #16414

JustDr00py opened this issue Dec 14, 2024 · 2 comments · Fixed by #16236
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bug port-esp32

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@JustDr00py
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Port, board and/or hardware

esp32c3

MicroPython version

MicroPython v1.25.0-preview.114.gbdda91fe7.dirty on 2024-12-14; ESP32C3 module with ESP32C3

Reproduction

import espnow
from machine import Pin
from time import sleep

relay = Pin(19, Pin.OUT)

while True:
    relay.on()
    sleep(1)
    relay.off()
    sleep(1)

Expected behaviour

Relay to Turn on and off.

Observed behaviour

Traceback (most recent call last):
File "", line 13, in
ValueError: invalid pin

Additional Information

previous branch sdkconfig.c3usb

CONFIG_ESP32C3_REV_MIN_3=y
CONFIG_ESP32C3_BROWNOUT_DET=y
CONFIG_ESP32C3_BROWNOUT_DET_LVL_SEL_7=
CONFIG_ESP32C3_BROWNOUT_DET_LVL_SEL_4=y
CONFIG_ESP32C3_BROWNOUT_DET_LVL=4
CONFIG_ESP_CONSOLE_UART_DEFAULT=
CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y

master branch sdkconfig.c3usb

CONFIG_ESP32C3_REV_MIN_3=y

# Workaround for https://github.com/espressif/esp-idf/issues/14456
CONFIG_ESP_SYSTEM_HW_STACK_GUARD=n

Usually I can block CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=y and pin 18 and 19 work but not in this case?

Code of Conduct

Yes, I agree
@JustDr00py JustDr00py added the bug label Dec 14, 2024
@andrewleech
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The CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG was removed in #15523 and in particular 0a11832c as part of a long series of attempts to improve the configurability of stdio across all the esp32 chips.

From the specific change comment I think you might be able to instead add CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG_ENABLED=n to the sdkconfig to disable the USB out and free up the pins that way.

For reference the other extra settings were removed in #15610 as the defaults were more appropriate and/or were the same so there was not need to add them here.

@andrewleech andrewleech changed the title Missing Parameters in sdkconfig.c3usb Disabling USB_SERIAL_JTAG on esp32c3 to free up the pins. Dec 18, 2024
@projectgus
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projectgus commented Jan 7, 2025 •
edited
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Currently it may be possible to free up the USB Serial/JTAG pins on C3 by changing mpconfigboard.h or mpconfigport.h and setting #define MICROPY_HW_ESP_USB_SERIAL_JTAG 0, and also changing CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG_ENABLED=n as described by @andrewleech. The second part is a bug.

After #16236 is merged then you will only need #define MICROPY_HW_ESP_USB_SERIAL_JTAG 0 to get the same result.

Longer term I have a patch in development to automatically allow changing the USB pin modes on any build config, if USB is not currently in use. This is tracked in #14217 (although that issue mentions S3 only in the title.)

@projectgus projectgus linked a pull request Jan 7, 2025 that will close this issue
esp32/machine_pin.c: Fix the logic when to clear USB_SERIAL_JTAG_USB_PAD_ENABLE #16236
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esp32/machine_pin.c: Fix the logic when to clear USB_SERIAL_JTAG_USB_PAD_ENABLE garywill/micropython
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@projectgus @andrewleech @JustDr00py
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