CC1 and CC2 - Do I need them for STM32MP157?

DMårt · ‎2024-03-24

I'm going to build my own computer by using STM32MP157 and install OpenSTLinux onto it.

The powering for STM32MP157 can be done via USB-C connection, but that requires an USB-C charger of 5 volts.

Can I skip that and only using a regular charger like 3.5 DC jack? I know that there are two pins that are connected to STM32MP157 processor. They are USB_PWR_CC1 and USB_PWR_CC2. They are connected to PA5 and PA4 at the processor.

Who is using these pins? Is it the OpenSTLinux?

Do I really need them?

PatrickF · ‎2024-03-26

HI @DMårt

CC1 and CC2 lines are used to detect the charger capabilities and uBoot will issue a message and blink red led.

This could be disabled in Device Tree if you are not using USB Type-C to power the board (or if you don't need such check).

See STM32MP157F-EV1 board for an example of 5V DC Jack power supply.

See also this rather old post on similar subject https://community.st.com/t5/stm32-mpus-boards-and-hardware/my-stm32mp157f-dk2-is-powered-by-5v-3a-psu-but-at-the-boot-up/m-p/211923

Regards

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