void UART3Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);//使能外设时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &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_Tx | USART_Mode_Rx;
USART_Init(USART3, &USART_InitStructure);
USART_Cmd(USART3, ENABLE);
}
void UART3SendByte(unsigned char SendData)
{ Set_DE;
Set_RE;DelayNmS(1);
USART_SendData(USART3,SendData);
while(USART_GetFlagStatus(USART3, USART_FLAG_TXE) == RESET);
DelayNmS(1);
Clr_DE;
Clr_RE;
}
unsigned char UART3GetByte(unsigned char* GetData)
{
Clr_DE;
Clr_RE;DelayNmS(1);
if(USART_GetFlagStatus(USART3, USART_FLAG_RXNE) == RESET)
{
return 0;//没有收到数据
}
*GetData = USART_ReceiveData(USART3);
DelayNmS(1);
Set_DE;
Set_RE;
return 1;//收到数据
}
void RS485_Test(void)
{
unsigned char i = 0;
unsigned char a = 0;
while(1)
{
while(UART3GetByte(&i))
{ UART3SendByte(i);
if(i==0x01){ LedOutput(0,1);}
if(i==0x02){ LedOutput(1,1);}
if(i==0x03){ LedOutput(2,1); }
if(i==0x04){ LedOutput(0,0); LedOutput(1,0); LedOutput(2,0);}
}
}
} |