The UART Of Alternate function after remap
RX is in PIN1，TX is in PIN5
The program has never been interrupted, RXNE has been 0.
What is the reason why you want to ask?
My configuration is as follows:
UART1_Init((uint32_t)9600, UART1_WORDLENGTH_8D,UART1_STOPBITS_1, UART1_PARITY_NO,