[GH-ISSUE #248] S3_C6_NanoAP TX/RX Pins not fitting to the patformio.ini? #2352

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sascha_hemi · 2026-03-20T21:05:45+01:00

sascha_hemi commented

2026-03-20 21:05:45 +01:00

Originally created by @TimSchimansky on GitHub (Feb 28, 2024).
Original GitHub issue: https://github.com/OpenEPaperLink/OpenEPaperLink/issues/248

Describe the bug
Not able to flash the C6 from my S3

To Reproduce

Order the gerber files from the repo (S3_C6_NanoAP)
Check for solder bridges
Flash via web flasher
Look into serial monitor

Expected behavior
The expected behavior should be a working AP, but the serial output just says:

I wasn't able to connect to the AP radio. Did you flash it?
The build of this firmware expects an AP tag with TXD/RXD on ESP32 pins 13 and 14, does this match with your wiring?

On closer inspection, I saw, that GPIO11 (S3) is connected to TX (C6) and GPIO12 (S3) is connected to RX (C6). Something is not correct here. Or maybe I have a giant twist in my head.

Additional context
I also build two devices, to check if i did not kill anything, but they have the exact same error type. For both of them, the webinterface is totally fine, but unusable, if there is no radio.

Originally created by @TimSchimansky on GitHub (Feb 28, 2024). Original GitHub issue: https://github.com/OpenEPaperLink/OpenEPaperLink/issues/248 **Describe the bug** Not able to flash the C6 from my S3 **To Reproduce** 1. Order the gerber files from the repo (S3_C6_NanoAP) 2. Check for solder bridges 3. Flash via web flasher 4. Look into serial monitor **Expected behavior** The expected behavior should be a working AP, but the serial output just says: ``` I wasn't able to connect to the AP radio. Did you flash it? The build of this firmware expects an AP tag with TXD/RXD on ESP32 pins 13 and 14, does this match with your wiring? ``` On closer inspection, I saw, that GPIO11 (S3) is connected to TX (C6) and GPIO12 (S3) is connected to RX (C6). Something is not correct here. Or maybe I have a giant twist in my head. **Additional context** I also build two devices, to check if i did not kill anything, but they have the exact same error type. For both of them, the webinterface is totally fine, but unusable, if there is no radio.

sascha_hemi closed this issue

2026-03-20 21:05:46 +01:00

sascha_hemi commented

2026-03-20 21:05:46 +01:00

@nlimper commented on GitHub (Feb 28, 2024):

Everything works as expected. The S3 has two serial connections with the C6.
You forgot to flash the C6. For that: go to the config tab, choose update, choose 'update esp32-c6'.

@nlimper commented on GitHub (Feb 28, 2024): Everything works as expected. The S3 has two serial connections with the C6. You forgot to flash the C6. For that: go to the config tab, choose update, choose 'update esp32-c6'.

sascha_hemi commented

2026-03-20 21:05:46 +01:00

@TimSchimansky commented on GitHub (Feb 28, 2024):

Ok if this info is part of the wiki, I somehow always skipped this while reading. It works now.

@TimSchimansky commented on GitHub (Feb 28, 2024): Ok if this info is part of the wiki, I somehow always skipped this while reading. It works now.

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Reference: starred/OpenEPaperLink#2352