Unable to program ESP32-C3 from USB

Sayantan
Posts: 3
Joined: Sun Dec 03, 2023 4:16 pm

Unable to program ESP32-C3 from USB

Postby Sayantan » Sun Dec 03, 2023 4:45 pm

Hello,

I am made a project with ESP32-C3-MINI-1-H4 module in the past and it works great. I could program it directly from USB out of the box. But for a newer project I used ESP32-C3-MINI-1-N4 variant. As per the datasheet,
The ESP32-C3FN4 chip and the ESP32-C3FH4 chip vary only in the ambient temperature
. However after making the PCB I can't program it directly from USB.
So I pull the GPIO 9 LOW to put it into boot mode and when I compare it with the previous board that I have I found, in the serial monitor my previous board (based on ESP32-C3FH4 chip) shows

Code: Select all

ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x15 (USB_UART_CHIP_RESET),boot:0x0 (USB_BOOT)
Saved PC:0x400462e2
wait usb download
while this new board (based on ESP32-C3FN4 chip) shows

Code: Select all

ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x15 (USB_UART_CHIP_RESET),boot:0x2 (UART0_BOOT)
Saved PC:0x400462e2
wait uart0 download
I don't understand why it functions differently on both modules while rest of the circuit is identical on both boards.
How can I change this boot mode to make the ESP32-C3-MINI-1-N4 module program over USB since I didn't break out the UART pins.
Please help!
Thanks

ESP_Sprite
Posts: 9713
Joined: Thu Nov 26, 2015 4:08 am

Re: Unable to program ESP32-C3 from USB

Postby ESP_Sprite » Mon Dec 04, 2023 1:33 am

Can you check GPIO8? It should have a high level (either externally or due to the internal pullup)

Sayantan
Posts: 3
Joined: Sun Dec 03, 2023 4:16 pm

Re: Unable to program ESP32-C3 from USB

Postby Sayantan » Mon Dec 04, 2023 10:11 am

Yes, GPIO 8 has external 10k pullup resistor on both boards

ESP_Sprite
Posts: 9713
Joined: Thu Nov 26, 2015 4:08 am

Re: Unable to program ESP32-C3 from USB

Postby ESP_Sprite » Tue Dec 05, 2023 2:23 am

Can you check if it's actually doing its job of pulling the GPIO up? There've been some instances with people with issues like you have that had a short to ground under the module.

Sayantan
Posts: 3
Joined: Sun Dec 03, 2023 4:16 pm

Re: Unable to program ESP32-C3 from USB

Postby Sayantan » Tue Dec 05, 2023 9:30 am

Okay, there are external circuitry connected on the GPIO 8 and I think that might pulling the pin low, I removed it and now I am able to program it via USB, thank you so much for your help.

ESP_Sprite
Posts: 9713
Joined: Thu Nov 26, 2015 4:08 am

Re: Unable to program ESP32-C3 from USB

Postby ESP_Sprite » Tue Dec 05, 2023 12:21 pm

You are welcome!

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