Remember once stm32f103 bootloader debugging

A period of time to change the STM32 of the bootloader program, but has not been tested, today put the app to write well after adding bootloader debugging together

found that the app in the 0x80000000 address serial port can send and receive data, in the 0x8003400 address can only send can not receive data, compared to various registers, found that there is no configuration error, really big head.

Suspect that the interrupt vector may be a problem, and then consulted the relevant data, found the need to set the offset of the interrupt vector, set the interrupt vector offset to 0x3400 to work properly.

The library functions in the following way: