Programming esp32 via uart

Beno2024
Posts: 2
Joined: Thu May 09, 2024 8:55 am

Programming esp32 via uart

Postby Beno2024 » Thu May 09, 2024 9:11 am

Hey
Ive designed a pcb with the esp32-c3-mini-1 as the main piece. I wanted to program the esp32 via the uart pins so i prepeared a uart connector with rx,tx,3v3,gnd pins. I would like to program the eap using an external ftdi connected to the laptop and to the uart connector , will that work? Or do i have to use the jtag lines ?
Because i know the usb lines can be used programming pins

DrMickeyLauer
Posts: 168
Joined: Sun May 22, 2022 2:42 pm

Re: Programming esp32 via uart

Postby DrMickeyLauer » Thu May 09, 2024 10:43 am

UART: You need to set the device manually into the download mode, since it doesn't sound like you have adopted the RTS/DTS circuit for automatic reset into download mode.
JTAG: Once you have initial software running, you can program the device via JTAG. JTAG can reset the device on its own.

Beno2024
Posts: 2
Joined: Thu May 09, 2024 8:55 am

Re: Programming esp32 via uart

Postby Beno2024 » Thu May 09, 2024 10:55 am

Thanks !
I would rather not use Jtag due to other constrains.
Ao what I gather from what you say is I can use the uart for programming if I put the esp to download mode, via hardware ?
Ben

mikemoy
Posts: 627
Joined: Fri Jan 12, 2018 9:10 pm

Re: Programming esp32 via uart

Postby mikemoy » Thu May 09, 2024 4:30 pm

Ao what I gather from what you say is I can use the uart for programming if I put the esp to download mode, via hardware ?
yes

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