把战舰开发板上的USART1串口改成USART2通信,结果能正确收到数据却不能发送数据。
usart2初始化如下:
[mw_shl_code=c,true]void uart2_init(u32 bound){
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* config USART2 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
USART_DeInit(USART2);
//USART2_TX PA.2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//USART2_RX PA.3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//????????
GPIO_Init(GPIOA, &GPIO_InitStructure); //??????PA10
//Usart1 NVIC ????
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//USART ???????è??
USART_InitStructure.USART_BaudRate = bound;
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);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_Cmd(USART2, ENABLE);
}[/mw_shl_code]
MAIN函数代码如下
[mw_shl_code=c,true]int main(void)
{
u16 times;
u8 t,len;
delay_init(); //???±??????????
uart2_init(9600);
TIM3_Int_Init(9,7199);
LED_Init(); //LED??????????
Usart_SendChar(USART2,'b');
while(1)
{
if((USART_RX_STA>0)&(tt>3))
{
len=USART_RX_STA&0x3fff;//?????????????????????¤??
printf("
?ú·???????????:");
for(t=0;t<len;t++)
{
Usart_SendChar(USART2,USART_RX_BUF[t]);
}
printf("
");//????????
USART_RX_STA=0;
}
else
{
times++;
if(times%500==0)
{
Usart_SendChar(USART2,'a');
//printf("AT+CIPMUX=0
");
}
if(times%30==0)LED0=!LED0;//????LED,?á??????????????.
delay_ms(10);
}
}
}[/mw_shl_code]
工程帮忙在附件,请各位大神帮忙
友情提示: 此问题已得到解决,问题已经关闭,关闭后问题禁止继续编辑,回答。
不知你调用printf串口能否收到?
一周热门 更多>