Question about UART Downloading

XiaMaoMao
Posts: 4
Joined: Mon Jul 16, 2018 2:23 am

Question about UART Downloading

Postby XiaMaoMao » Thu Jul 19, 2018 3:18 am

Hi,

Is anyone can answer me this question?

According to the description on Page 26 of ES32 Hardware Design Guidelines V2.1,
"1. Set the module to UART Download mode by pulling IO0 (pulled up by default) and IO2 (pulled down by default) low. The chip IOs are pulled down internally by default."

However, IO2 on ESP32-DevKitC or ESP32-PICO-Kit is floating, only IO0 is connected to the related circuit. Can anyone explain this?

Thanks.

WiFive
Posts: 2946
Joined: Tue Dec 01, 2015 7:35 am

Re: Question about UART Downloading

Postby WiFive » Thu Jul 19, 2018 6:08 am

Io2 has internal pulldown so as long as you do not pull it or drive it high it will be read as low

XiaMaoMao
Posts: 4
Joined: Mon Jul 16, 2018 2:23 am

Re: Question about UART Downloading

Postby XiaMaoMao » Fri Jul 20, 2018 3:02 am

Oh, yes, thanks a lot for your explanation.

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