Question

stm32串口 波特率如何在线更改

Answer 1

先关闭串口，修改好后开启；正在通信时不可以修改。用个函数,使用固件库
void USART_Config(uint32_t baud)
{
USART_InitTypeDef USART_InitStructure;
USART_Cmd(USART1, DISABLE);
USART_InitStructure.USART_BaudRate =baud
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}

uint32_t baud_table[]={2400,4800,9600,115200,~~~~~~~};
定义个波特率表，根据外部触发或外中断 更改索引 用新的波特率值传给baud参数，调用这个函数

Answer 2

通常 不是 先设定 再使用吗？