Currently, we are using the S32K344 + FS6500 chip in combination with it for the VCU controller. This project is the first to use the HSE module to meet the information security requirements. The used RTD version is 1.0.0, and the HSE version is 0.2.1.0. Currently, the project has entered the small-scale verification stage. Currently, there is a problem:
Occasionally, after power-on, the VCU cannot start. Testing revealed that the power output of the SBC is normal after power-on, but the LED indicator controlled by the MCU does not work. Testing found that the SPI of the SBC did not send communication after power-on, and the REST pin continuously emitted periodic reset signals with a period of approximately 200ms, pulling low for about 8ms. Currently, we suspect that it gets stuck in the HSE part after power-on and does not reach the SBC initialization, resulting in a timeout reset within 256ms.
However, we have discovered an unexplainable phenomenon. When we disconnect the reset pins of the MCU and SBC, the controller recovers. After recovery, if it is reconnected, the problem cannot be reproduced. Or if a debugger is attached, it also recovers. After recovery, the fault cannot be reproduced either. Currently, we are unable to explain this phenomenon.