I don't know what i have done wrong, but i can't communicate with my portenta anymore. The orange LED, which is connected to the fancy power supply IC, is on and turns off an on every ~15 seconds. I measured the input and output voltages of the power supply.
- 5.0 V USB voltage is fine
- VSYS are 4.18 V
- +3V1SW -> not present
- +3V3 -> not present
- +3V1 -> available
- +1V0 -> not present
- +1V8 -> not present
- +1V2 -> not present
The STM32 should work properly since it is powered by 3.1V, right? As in one of the other post mentioned, it seems, that the MCU have not powered up the power supply yet.
Probably something is wrong with the bootloader, so i decided to use the ST-Link and the breakout board to reburn the bootloader.
I also overcome the problem the the 3.3V are not present, but which is needed for the ST-Link as reference voltage for the logic level. Therefore i use an external power supply.
I have tried to use the Arduino IDE, PlatformIO and the STM32CubeProgrammer to get access to the MCU. But every time i try, i get an error that the target can't be found.
I have now checked several times whether I have wired the SWD connection correctly and I am very sure that I have not made a mistake here. Also i use the newest firmware version of the ST-Link and I updated the Arduino IDE and the portenta core files.
I don't know what i can do to bring the portenta back to life. Any suggestions?