void COM2Init(u32 BaudRate)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource2, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_USART2);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = BaudRate;//波特率设置
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字节长度
USART_InitStructure.USART_StopBits = USART_StopBits_1;//停止位为一位
USART_InitStructure.USART_Parity = USART_Parity_No;//无极性
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件流
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //双工模式
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);//开启串口
USART_ClearFlag(USART2, USART_FLAG_TC);
}
调用的USART_SendData(USART2,9);发送数据
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