Problem phenomenon
Use Jlink to download on the STM32F429 platform. Only 4 lines VCC, SWIO, CLK, and GND are connected, and an Invalid ROM Table error message appears.
problem analysis
I encountered this error for the first time, and after searching the information, it was said that the crystal frequency modification error caused the program to lock up due to overclocking .
Problem handling
Because Jlink SWD is not connected to RESET when downloading, the operation steps are as follows:
1: Long press the RESET button
2: Power on the STM32 development board
3: Click Keil to download the firmware, and then release the RESET button when downloading the firmware.
(Note: This is how I solved the problem, and I don’t guarantee that everyone’s situation is the same.)