26 MHz crystal means no wifi/BLE?

onehorse
Posts: 57
Joined: Mon Feb 15, 2016 1:35 am

26 MHz crystal means no wifi/BLE?

Postby onehorse » Sun Oct 01, 2017 12:40 am

Just looked over the hardware manual again and noticed the comment that only the 40 MHz crystal is supported for wifi/BLE. I had 100 ESP32 dev boards produced that used the 26 MHz crystal (same as ESP8285) since at the time of the design (a year ago or so), this was what was included in the hardware technical manual as far as I can recall. Anyway, does this comment mean we can't use the wifi and ble for boards with the 26 MHz crystal ever, or just until Espressif figures out how to make this work, or ? What is the limitation here?

And do all of the WROOM32 modules use a 40 MHz crystal then?

WiFive
Posts: 1158
Joined: Tue Dec 01, 2015 7:35 am

Re: 26 MHz crystal means no wifi/BLE?

Postby WiFive » Sun Oct 01, 2017 1:39 am

You can use it with manual setting in menuconfig. I think it is discouraged because it does not perform as well as 40mhz in RF section.

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