在stm32中使用printf
记录使用printf的方法
1.配置GPIO
GPIO_InitTypeDef GPIO_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//使能USART时钟
GPIO_InitStruct.GPIO_Pin =GPIO_Pin_9;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;//TX复用推挽
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_10;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;//RX浮空输入
GPIO_Init(GPIOA, &GPIO_InitStruct);
2.配置中断
NVIC_InitTypeDef NVIC_InitStruct;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStruct.NVIC_IRQChannel=USART1_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStruct);
3.配置USART
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 115200; /* 波特率 */
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(USART2, &USART_InitStructure);
4.使能中断
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);//使能接收中断
USART_Cmd(USART1,ENABLE);
5.重定向fputc fgetc
int fputc(int ch,FILE* f)
{
USART_SendData(USART1,(uint8_t)ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
return ch;
}
int fgetc(FILE* f)
{
while(USART_GetFlagStatus(USART1,USART_FLAG_RXNE)==RESET);
return (int)USART_ReceiveData(USART1);
}
