STM32组合设备实现USB转双串口

串口及其中断初始化

void USART1Init(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);    

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_Init(USART1, &USART_InitStructure); 

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

USART_ClearFlag(USART1,USART_FLAG_TC);

USART_Cmd(USART1, ENABLE);

}

void NVIC_USART1_Init(void)

{

  NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

串口发送一个字节函数

void Usart1SendByte(char byte)//发送一个字节 硬件连接选用的为USART1

{

USART1->SR; 

USART_SendData(USART1, (uint8_t) byte);

while( USART_GetFlagStatus(USART1,USART_FLAG_TC)!= SET);

}

数据打包发送函数

 void ADC_ConvertSend(float value)

 {

 unsigned char temp[6];

 char CheckStart='~';//数据传输开始

 char CheckEnd='!';//表示一次传输完成

 unsigned short i=0,j=0;  

float floatVariable=value;   

unsigned char *pdata = (unsigned char *)&floatVariable;

 temp[0]=CheckStart;//数据包头

for(i=0;i<4;i++)  

{  

temp[i+1] = *pdata++;//float转BYTE

}  

temp[5]=CheckEnd;//数据包尾

for( j=0;j<6;j++)

 {

  Usart1SendByte(temp[j]);

 }

 }