能不能帮我看看，我代码是缺少什么配置，以至于打印输出结果是这样？我仅仅是用一个USB转串口利用串口监控软件监控PA9的输出，PA10脚没有接任何东西，以下是我的监控输出结果
USART Send Start<LF>
USART1 IRQ<LF>
USART1 IRQ<LF>
USART1 IRQ<LF>
USART1 IRQ<LF>
USART Send Start<LF>
USART Send Start<LF>
USART Send Start<LF>
以下是我的代码
int main(void)
{
u8 t = 0;
u8 len;
u16 times=0;
char str[64];
SystemInit();
delay_init(72);
NVIC_Configuration();
uart_init(115200);
printf("USART Send Start\n");
while(1)
{
}
}
#if 1
#pragma import(__use_no_semihosting)
struct __FILE
{
int handle;
};
FILE __stdin;
FILE __stdout;
_sys_exit(int x)
{
x = x;
}
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);
USART1->DR = (u8) ch;
return ch;
}
#endif
u8 USART_RX_BUF[64];
u8 USART_RX_STA=0;
void uart_init(u32 bound){
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 \
| RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
//USART1_TX PA.9
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);
//USART1_RX PA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//Usart1 NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
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(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}
void USART1_IRQHandler(void)
{
u8 Res;
printf("USART1 IRQ\n");
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
Res =USART_ReceiveData(USART1);
if((USART_RX_STA&0x80)==0)
{
if(USART_RX_STA&0x40)
{
if(Res!=0x0a)USART_RX_STA=0;
else USART_RX_STA|=0x80;
}
else
{
if(Res==0x0d)USART_RX_STA|=0x40;
else
{
USART_RX_BUF[USART_RX_STA&0X3F]=Res ;
USART_RX_STA++;
if(USART_RX_STA>63)USART_RX_STA=0;
}
}
}
}
} |
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