stm32双串口收发

#include "sys.h" #include "usart.h" #include "delay.h" u8 usart1_buf[100]={0},usart2_buf[100]={0},usart3_buf[100]={0}; u16 index1=0,index2=0,index3=0,flag1=0,flag2=0,flag3=0; void uart_init(u32

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