void USART3_Configuration(uint32_t UART_baud) //波特率，如115200
{
USART_InitTypeDef USART_InitStructure;
GPIO_PinRemapConfig(GPIO_FullRemap_USART3,ENABLE);
/* USARTx configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = UART_baud;//115200;
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;
USART3_COMInit(&USART_InitStructure);
}
void USART3_COMInit(USART_InitTypeDef* USART_InitStruct)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD| RCC_APB2Periph_AFIO, ENABLE); //使能串口所有GPIO模块时钟,并使能AFIO模块时钟
/* Enable UART clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //使能串口模块时钟
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //设置TX引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //设置RX引脚
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* USART configuration */
USART_Init(USART3, USART_InitStruct); //初始化USART
/* Enable USART */
USART_Cmd(USART3, ENABLE); //使能串口模块
}
波特率119200以上就会出现乱码，牛人说可能是我的485线太长了，9600一下没问题
stm32/stm8