stm32串口1和串口3数据互通，经测试同时发256字节不丢包voidusart3_init(u32bound){NVIC_InitTypeDefNVIC_InitStructure;GPIO_InitTypeDefGPIO_InitStructure;USART_InitTypeDefUSART_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);//GPIOBʱÖÓRCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE)