基于STM32F103上的232通讯问题

只看该作者 · 2016-11-17 14:16

我用232通讯，发现仿真时候，IO口接收不到数据。用示波器捕捉了下 MAX232的输出口  有时序的变化。想请问下大婶们  这个问题可能发生在什么位置，我以前是弄485的 232通讯是第一次用。不知道这两个在编程上面有什么区别？
void UART3_Init(unsigned short baudrate)
{
GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

// RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
USART_DeInit(USART3);

USART_InitStructure.USART_BaudRate = baudrate;
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长8
USART_InitStructure.USART_StopBits = USART_StopBits_1;//1位停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//打开rx跟tx功能
USART_Init(USART3, &USART_InitStructure);//初始化
USART_Cmd(USART3, ENABLE);//启动串口
while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);
USART_ClearFlag( USART3, USART_FLAG_TC );//发送完成标志
}
这个是配置口
这个是优先级配置
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef  VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

//    NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
//    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
//    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
//    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//    NVIC_Init(&NVIC_InitStructure);

// NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);

// USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
}
void SYS_Init(void)
{
uchar i;
IO_Init(); //将相关IO口初始化
UART3_Init(9600); //将串口3波特率设为9600，且将其初始化
TIM2_Int_Init(10000-1,7200-1);//1s    //将定时器2定时时间设为1秒，并将其初始化
TIM3_Int_Init(208-1,72-1);//20ms/96    //将定时器3定时时间设为20/96ms，并将其初始化
// TIM4_Int_Init(10000-1,4800-1);//0.667s //将定时器4定时时间设为0.667s
NVIC_Configuration();    //设置中断嵌套优先级
RTCInit();    //初始化RTC实时时钟，显示初始时间为2014年1月1日
Iwdg_Init();    //初始化独立看门狗
for(i=0;i<9;i++)
{
power_rule[i]=0;
power_Delay[i]=0;
}

}

只看该作者 · 2016-11-17 15:37

在仿真过程中，程序一直没有进到串口中断服务程序中。。。
void USART3_IRQHandler(void)
{
unsigned char UART_BUF3;
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
{
UART_BUF3 =USART_ReceiveData(USART3);
if(POINT3==0)
{
if(UART_BUF3)
Rec_BUFDATA3[POINT3] = UART_BUF3;
POINT3++;
}
else
{
Rec_BUFDATA3[POINT3] = UART_BUF3;
POINT3++;
}
}
}