ESP32 Forum

Hi Team,
We are using the ESP32-C6 in our project and attempting to enter Boot mode by asserting GPIO9 to LOW. However, every time we try, the device enters either SPI Boot or Download or SDIO Boot. Since we are only using UART Boot for our project, we want to disable SPI Boot and SDIO Boot in our project. Is this possible?

Additionally, we want our devices to enter Boot mode without requiring any external switching on GPIO9 and GPIO8. Are there any available options in code to achieve this?


Thanks.

Hi Team,
We are using the ESP32-C6 in our project and attempting to enter Boot mode by asserting GPIO9 to LOW. However, every time we try, the device enters either SPI Boot or Download or SDIO Boot. Since we are only using UART Boot for our project, we want to disable SPI Boot and SDIO Boot in our project. Is this possible?

Sounds to me like GPIO8 is not high when the chip is reset. Suggest you check your schematic.

Additionally, we want our devices to enter Boot mode without requiring any external switching on GPIO9 and GPIO8. Are there any available options in code to achieve this?

There is. Either the USB-serial-JTAG can do this after a program is loaded, or software can set a bit in the RTC and reboot into download mode. Note that misconfigured software can stop either from happening (by reconfiguring the GPIO pins or hard bootlooping), so you may still want to have GPIO9 accessible somehow, at least in development setups.

Thanks for your Response.
GPIO8 is kept floating. Do i need to connect this pin to HIGH logic?

Can you please share the software that can be used? And for development, we are fine with GPIO9 accessible, but we are looking for production setups. If you got any suggestion, pls share.


Regards,
Jagan K

GPIO8 is kept floating. Do i need to connect this pin to HIGH logic?

Yes, use a pullup to 3.3V. Suggest that in general you go through the hardware design guidelines to check if you did everything that applies to a module.

Can you please share the software that can be used?

Software for what?