What is the function of this circuit in ESP32_Audio_kit?

se7ens

What is the function of this circuit in ESP32_Audio_kit? [Copy link]

I got the ESP32_Audio_kit development board a few days ago.

After looking at the schematic, I found this circuit in the USB2UART block.

What is the function of this circuit?

My understanding is that UART only needs TX RX, why does it need DTR RTS RST?

I hope you can give me some advice. Thanks in advance.

darichile

Dear, this part of the circuit is used to automatically burn the program.

cruelfox

Didn't you see that IO1, IO2, and RST pins are connected? See my ESP32 Korvo board review article.

dcexpert

Through RTS and DTR, corresponding signals are generated during operation to put ESP32 into running mode or downloading mode. The advantage is that it can be controlled without buttons, but the disadvantage is that some software does not control RTS and DTR, and ESP32 may not run normally.

se7ens

dcexpert published on 2021-9-1 08:35 Through RTS and DTR, corresponding signals are generated during operation to put ESP32 into running mode or download mode. The advantage is that it can be controlled without buttons, but the disadvantage is that there are...

Thank you for your answer

That is to say, if the program cannot be downloaded automatically, you can still manually RST

se7ens

darichile posted on 2021-8-31 17:55 Dear, this part of the circuit is used to automatically burn the program.

Thank you for your answer, but I am not clear about the principle and logic.

se7ens

cruelfox posted on 2021-8-31 18:07 Didn’t you see that you also connected the IO1, IO2, and RST pins? See my article on the ESP32 Korvo board review.

https://en.eeworld.com/bbs/thread-1157722-1-1.html#pid3082198

Is this the post?

There is no mention of the function of this circuit.

cruelfox

se7ens posted on 2021-9-1 15:05 https://en.eeworld.com/bbs/thread-1157722-1-1.html#pid3082198 Is this the post? There is no mention of this...

It is this https://en.eeworld.com/bbs/thread-1156053-1-1.html

According to the ESP32 manual, which pins are used when selecting the bootloader mode at startup?

dcexpert

se7ens posted on 2021-9-1 15:02 Thank you for your answer. It means that if the program cannot be downloaded automatically, you can still manually RST

Yes.