请教：使用32F1两个串口USART2与USART2，发现只有USART2可以正常使用，串口三和串口一都不行，无法进入中断接收服务...

zp2000 · 发表于 2020-4-13 19:46:39

void USART3_Init(u32 bout)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
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_11;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel=USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStructure);

USART_InitStructure.USART_BaudRate=bout;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
USART_InitStructure.USART_Parity=USART_Parity_No;
USART_InitStructure.USART_StopBits=USART_StopBits_1;
USART_InitStructure.USART_WordLength=USART_WordLength_8b;
USART_Init(USART3,&USART_InitStructure);

USART_Cmd(USART3,ENABLE);
USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);

}

void USART2_Init(u32 bout)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;
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_3;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStructure);

USART_InitStructure.USART_BaudRate=bout;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
USART_InitStructure.USART_Parity=USART_Parity_No;
USART_InitStructure.USART_StopBits=USART_StopBits_1;
USART_InitStructure.USART_WordLength=USART_WordLength_8b;
USART_Init(USART2,&USART_InitStructure);

USART_Cmd(USART2,ENABLE);
USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
}

void USART3_Sendstring(u8*str)
{
u8 index=0;
do
{
USART_SendData(USART3,str[index]);
while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==0);
index++;
}
while(str[index]!=0);
}

void USART2_Sendstring(u8*str)
{
u8 index=0;
do
{
USART_SendData(USART2,str[index]);
while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==0);
index++;
}
while(str[index]!=0);
}

u8 Rx_BUF_THREE[64];
u8 Rx_OVER_THREE;
u8 Rx_cont_THREE;

u8 Rx_BUF_TWO[64];
u8 Rx_OVER_TWO;
u8 Rx_cont_TWO;

if(USART_GetITStatus(USART3,USART_IT_RXNE)==1)
{
USART_ClearITPendingBit(USART3,USART_IT_RXNE);

temp=USART_ReceiveData(USART3);

if(temp=='\n')
{
Rx_cont_THREE=0;
Rx_OVER_THREE=1;
USART_ITConfig(USART3,USART_IT_RXNE,DISABLE);
}
else
{
Rx_BUF_THREE[Rx_cont_THREE]=temp;
Rx_cont_THREE++;
}
}
}

void USART2_IRQHandler(void)
{
u8 temp=0;

if(USART_GetITStatus(USART2,USART_IT_RXNE)==1)
{
USART_ClearITPendingBit(USART2,USART_IT_RXNE);

temp=USART_ReceiveData(USART2);

if(temp=='\n')
{
Rx_cont_TWO=0;
Rx_OVER_TWO=1;
USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);
}
else
{
Rx_BUF_TWO[Rx_cont_TWO]=temp;
Rx_cont_TWO++;
}
}
}