ESP32-C3-MINI SPI and I2C

[VE3SVF]

Hi everyone!

I'm new to this forum and am looking for some help. I am working with the ESP32-C3-MINI SoC for a PCB board. I need to have SPI and I2C communication to two devices (SPI to device one, I2C to device two).

I cannot devise a pinout for these, as most of the breakout pins appear to be used for the internal SPI flash memory.

Could anyone please help?

Best,

Sasha (ham radio callsign VE3SVF)

[ESP_Sprite]

You can use any (not otherwise assigned/used) pin for SPI and I2C; the ESP32-C3 has a GPIO matrix that can route those signals arbitrarily.

[VE3SVF]

Sorry for the late reply!

Does that mean that I can use *any* pin? I know there are many precautions around other ESP32 SoCs because sometimes the SPI flash is connected and some pins are used for strapping.

[ESP_Sprite]

Sorry for the late reply!

Does that mean that I can use *any* pin? I know there are many precautions around other ESP32 SoCs because sometimes the SPI flash is connected and some pins are used for strapping.

Yep, hence my (not otherwise used/assigned) remark. Check the datasheet for the flash pins and don't use them, also check them for bootstrap pins and see if the restrictions on those are an issue. (Also note a fair amount of bootstrap pins only have an effect after some eFuse is burned; without that they're unrestricted.)

[VE3SVF]

Sorry for my continued confusion.

By "flash pins," do you mean the USB+,USB- and RX/TX pins, used for flashing firmware?

Thank you for your understanding!

[ESP_Sprite]

I mean the pins the (internal) flash is connected, again, check the datasheet. Aside from that, if you want to be able to re-flash your ESP32-C3, it's obviously good to also keep from using the pins you need to do that, yes.