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nkolban / esp32-snippets

Sample ESP32 snippets and code fragments
https://leanpub.com/kolban-ESP32
Apache License 2.0
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u8g2 Example for Heltec ESP32 #872

Open kschoos opened 5 years ago

kschoos commented 5 years ago

Hi, I had problems getting my Heltec ESP32 working with your I2C test code for the u8g2 display library. It was a really simple problem: The reset pin needed to be set in the u8g2 configuration.

I was curious if I could open a pull-request for my example configuration, so that future people like me may not need so much time debugging?

Best regards

TheEarl1 commented 4 years ago

I would be interested in your pull request!

Just setting the reset pin is not working for me. It appears, from the Heltec library that the reset GPIO is inverted from what the HAL is expecting. Did you need to modify the hal init function?

mabi commented 4 years ago

I would be interested in your pull request!

Just setting the reset pin is not working for me. It appears, from the Heltec library that the reset GPIO is inverted from what the HAL is expecting. Did you need to modify the hal init function?

@TheEarl1 I got it working by setting the reset pin u8g2_esp32_hal.reset =16 and calling the i2c setup u8g2_Setupssd1306i2c_128x64_noname_f(

TheEarl1 commented 4 years ago

I was missing the i2c setup, and was calling the spi setup. The reset GPIO is not inverted from what the i2c setup expects.

thanks @mabi