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Fixes REPL not booting on heltec_esp32s3_wifi_lora_v3#10410

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dhalbert merged 1 commit intoadafruit:mainfrom
baldengineer:fix_heltec_v3_no_boot
Jun 10, 2025
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Fixes REPL not booting on heltec_esp32s3_wifi_lora_v3#10410
dhalbert merged 1 commit intoadafruit:mainfrom
baldengineer:fix_heltec_v3_no_boot

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Fixes #10407.

Changed the GPIO in board.c, which controls the rail for the OLED screen and I2C pull-ups. Also added RESET signal to busdisplay constructor.

Tested with two Heltec WiFi LoRa V3 boards. On power-up the OLED shows the CircuitPython REPL. Opening serial port shows boot getting past Serial console setup and into the REPL. I was able to upload libraries and run code via code.circuitpython.org.

(Resubmission of PR #10408, I targeted the wrong branch.)

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Thanks for this fix!

@dhalbert dhalbert merged commit 347a453 into adafruit:main Jun 10, 2025
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dhalbert commented Dec 3, 2025

@baldengineer Would you mind testing your board(s) again with 10.0.3? In https://forums.adafruit.com/viewtopic.php?t=221471, a user reports there is no REPL control via serial. Thanks.

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baldengineer commented Dec 10, 2025

@baldengineer Would you mind testing your board(s) again with 10.0.3? In forums.adafruit.com/viewtopic.php?t=221471, a user reports there is no REPL control via serial. Thanks.

Tested with 10.0.3 and I have access to the REPL in serial (and can see it on the OLED.)

I erased Flash before updating from 9.x.x.

image

Just a reminder that the Heltec's ESP32 doesn't have a native USB interface. So the baud rate needs to be 115200.

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Heltec WiFi LoRa 32 V3 does not finish booting

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