ESP32 Forum

Posted: **Wed Sep 06, 2017 5:00 am**

I have SparkFun combo CSS811 BME280 board. Recently I experience, flash always fail. I have D2 line connected to SCL of Combo board. As soon as I pulled out the SCL line to D2, it works.I connect it to D23, D1. They work too. I have not tried on other pins, I am running the Kolban's hello program which has not run yet. As the issue is flashing.

Has anyone experienced similar thing?

Posted: **Wed Sep 06, 2017 5:27 am**

Gpio2 is strapping pin must be low to go into flash download mode so i2c pull-up is conflict. Check esp32 datasheet

Posted: **Wed Sep 06, 2017 7:46 am**

Thanks for the info. Should have checked it myself.

Thank you

ESP32 Forum

SparkFun ScL line to D2 ESPWROOM32 causes flash to fail

SparkFun ScL line to D2 ESPWROOM32 causes flash to fail

Re: SparkFun ScL line to D2 ESPWROOM32 causes flash to fail

Re: SparkFun ScL line to D2 ESPWROOM32 causes flash to fail