Cannot light up the LCD of STM32MPU135-DK

[tomcat]

• If the board power supply does not supply enough current (3A), the red LED indicates the issue following the rules below:

LED blinking mode Console message Boot process

Twice	WARNING 500mA power supply detected Current too low, use a 3A power supply!	Continue and red LED stays ON
3 times	WARNING 1500mA power supply detected Current too low, use a 3A power supply!	Continue and red LED stays ON
forever	ERROR USB TYPE-C connection in unattached mode Check that USB TYPE-C cable is correctly plugged	stop
forever	USB TYPE-C charger not compliant with USB specification	stop

I confirm that my power supply supports 5V3A.

my log as follow:

Previous ADC measurements was not the one expected, retry in 20ms

********************************************************

*    WARNING 500mA power supply detected     *

*    Current too low, use a 3A power supply!        *

*******************************************************

[PatrickF · Accepted solution]

HI @tomcat 

current which could be provided by the supply is one thing, but the current capabilities exposed to the USB Type-C as per the standard matters.

I think you are using a Type-A -> Type-C cable. Please try an USB Type-C charger.

Alternatively, there is way to disable this check in the device tree.

Regards

[tomcat]

First of all, thank you for your reply!

I've tried using an USB Type-C charger, the result was the same.

--"Alternatively, there is way to disable this check in the device tree. "

--What can I do to  disable this check in the device tree?

[PatrickF]

HI @tomcat 

strange that an USB Type-C charger (with a Type-C <-> Type-C cable) does not work. There is probably some chargers not fully compliant with the standard (even if working with some phones, which could also use different way to detect capabilities like quick-charge).

To disable the check in the SW, see this post 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/211924/highlight/true#M472

It is related to STM32MP15-DK2, so definition is likely different as board is different, but it could probably help you.

Regards

[tomcat]

I bought another power cord：

The previous log is no longer printed：

Previous ADC measurements was not the one expected, retry in 20ms

********************************************************

*    WARNING 500mA power supply detected     *

*    Current too low, use a 3A power supply!        *

*******************************************************

The complete log is attached "log2024.06.26.txt".

Looking forward to your reply.

Regards