天行健,君子以自强不息
分类: C/C++
2011-11-22 15:49:03
由于串口1、2是在GPIOA上:
所以要是能串口GPIOA、AFIO和1或者2的串口时钟,代码如下:
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |
RCC_APB2Periph_AFIO |
RCC_APB2Periph_USART1 ,
ENABLE);
2、对串口的具体物理管脚进行相应的配置:
/* A9 USART1_Tx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //推挽输出-TX
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* A10 USART1_Rx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入-RX
GPIO_Init(GPIOA, &GPIO_InitStructure);
3、在设置波特率、数据位、停止位。。。。。。。
完整测试程序如下:
串口的配置:
void USART_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |
RCC_APB2Periph_AFIO |
RCC_APB2Periph_USART1 ,
ENABLE);
/* A9 USART1_Tx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* A10 USART1_Rx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART1, &USART_ClockInitStructure);
USART_Init(USART1, &USART_InitStructure);
/* Enable the USARTx */
USART_Cmd(USART1, ENABLE);
//
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
// A2 ×?T2X
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// A3 ×?R2X
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART2, &USART_ClockInitStructure);
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
//
USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
}
串口发送函数:
void USART1_Putc(unsigned char c)
{
USART_SendData(USART1, c);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET );
}
void USART1_Puts(char * str)
{
while(*str)
{
USART_SendData(USART1, *str++);
/* Loop until the end of transmission */
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
}
串口1接收中断函数:
void USART1_IRQHandler(void)
{
//接收中断
if(USART_GetITStatus(USART1,USART_IT_RXNE)==SET)
{
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
Uart1_Get_Data=USART_ReceiveData(USART1);
}
//溢出-如果发生溢出需要先读SR,再读DR寄存器 则可清除不断入中断的问题
if(USART_GetFlagStatus(USART1,USART_FLAG_ORE)==SET)
{
USART_ClearFlag(USART1,USART_FLAG_ORE); //读SR
USART_ReceiveData(USART1); //读DR
}
}