用USART中断接收字符串再判断处理，大神帮忙看看代码呗。

只看该作者 · 2014-4-8 16:01

本帖最后由 GERALDWONG 于 2014-4-8 16:45 编辑

USART中断接收里数组接着数据，判断，若正确，则用DMA输出我想要输出的文字。
tool.c:
//------------------TIM2始初化-----------------//
void TIM2_init()
{
CLK_PeripheralClockConfig(CLK_Peripheral_TIM2,ENABLE);
TIM2_TimeBaseInit(TIM2_Prescaler_16,TIM2_CounterMode_Up, 1000);
TIM2_ARRPreloadConfig(ENABLE);
TIM2_ITConfig(TIM2_IT_Update, ENABLE);
TIM2_Cmd(ENSABLE);
}

//----------------DMA始初化---------------------//
void DMA_UARTSendData(unsigned char length)
{
CLK_PeripheralClockConfig(CLK_Peripheral_DMA1, ENABLE);
DMA_GlobalDeInit();
DMA_DeInit(DMA1_Channel1);
DMA_Init(DMA1_Channel1, (uint16_t)(&print[0]), 0x5231,
         length, DMA_DIR_MemoryToPeripheral,DMA_Mode_Normal,
         DMA_MemoryIncMode_Inc, DMA_Priority_High, DMA_MemoryDataSize_Byte);
USART_DMACmd(USART1, USART_DMAReq_TX, ENABLE);
DMA_ITConfig(DMA1_Channel1,DMA_ITx_TC,ENABLE);
DMA_GlobalCmd(ENABLE);
DMA_Cmd(DMA1_Channel1, ENABLE);//
}

//----------------USART始初化-----------------//
void USART_init(void)
{
  USART_DeInit(USART1);
  USART_ClockInit(USART1,USART_Clock_Enable,USART_CPOL_Low,USART_CPHA_2Edge,USART_LastBit_Disable);//可要可不要
  CLK_PeripheralClockConfig(CLK_Peripheral_USART1, ENABLE);
  USART_Init(USART1,115200,USART_WordLength_8b,USART_StopBits_1,USART_Parity_No,USART_Mode_Rx|USART_Mode_Tx);//
  USART_ITConfig(USART1, USART_IT_RXNE,ENABLE);
  USART_Cmd(USART1,ENABLE);
  }

stm8l15x_it.c:
//------------------DMA中断--------------------//
INTERRUPT_HANDLER(DMA1_CHANNEL0_1_IRQHandler, 2)
{
  /* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
  */
  //while (1);
disableInterrupts();
if(DMA_GetITStatus(DMA1_IT_TC1)!=RESET)
{
  DMA_ClearITPendingBit(DMA1_IT_TC1);
  DMA_Cmd(DMA1_Channel1, DISABLE);
  usart_sendlength=0;
}
enableInterrupts();
}

//-------------------------TIM2溢出中断-------------------------//
INTERRUPT_HANDLER(TIM2_UPD_OVF_TRG_BRK_IRQHandler, 19)
{
  /* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
  */
  //while (1);
  disableInterrupts();
  //dingshi++;
  TIM2irq_flag=1;
  /* Cleat Interrupt Pending bit */
  TIM2_ClearITPendingBit(TIM2_IT_Update);
  enableInterrupts();
}

//----------------------USART接收中断------------------//
INTERRUPT_HANDLER(USART1_RX_IRQHandler, 28)
  /* In order to detect unexpected events during development,
{
   it is recommended to set a breakpoint on the following instruction.
  */
{
//while(1);
   disableInterrupts();
   if(USART_GetITStatus(USART1, USART_IT_RXNE)!=RESET)
  {
   USART_ClearITPendingBit(USART1, USART_IT_RXNE);
      print[usart_sendlength]=USART_ReceiveData8(USART1); //用数组print来承载接收到的数据
      usart_sendlength++; //数组元素位置+1
      usart_freecount=0;//只要接收到数据，该标志位为0；
      usart_count_task=1;//证明接收到数据
}
enableInterrupts();
}

main.c:
void Task_assigement(void)
{
  if(TIM2irq_flag==1)
{
   TIM2irq_flag=0;
   if(usart_count_task==1)//接收中断触发usart_count_task=1
      {
         usart_freecount++;
         if(usart_freecount>=2)//判断接收的数组是否连续
         {
            usart_freecount=0;
            usart_count_task=0;
            pocceed_signal=1;
         }
      }
}
  if(pocceed_signal==1)
{
   pocceed_signal=0;
   password();//输入数据函数
   }
}

unsigned char command1[4]={'1','2','3','4'};
void password(void)
{
   if(String_compared(command1,4))//校验输入的是否为1234
   {

   u8 i;
   usart_sendlength=sizeof("\r\n请输入您需要的功能\r\n1:对时\r\n2:遥信\r\n3:数据记录\r\n4:故障波形\r\n");

   for(i=0;i<usart_sendlength;i++)
   print=printmessage1;

   DMA_UARTSendData(usart_sendlength);
   usart_sendlength=0;

   }
}

//--------------------------------字符逐个比较----------------------------//
unsigned char String_compared( unsigned char usartcommand[],unsigned char n)
{unsigned char i=0,j=0;
for(i=0;i<usart_sendlength;i++)
{
   if(print(i)==usartcommand（i)//逐个判断接收到的数据和已经定义好的数据
{
  j++;
  }
  else //如果任意一个不同，则跳出，节约运行时间
  {
  break;
  }
}

usart_sendlength=0;

if(j==n)//如果接收到的数组和已经定义好的数组里的元素全部相同
{
return 1;
}
else //如果不相同
{
return 0;
}

}
结果失败，后来把判断的部分不要，直接将接收到的数据用DMA打印出来，但是都漏掉后两位数据，例如我输入123只显示1，我输入1234只显示14，我输入123456只显示14，输入123456789只显示147，这个弄了好久，望大神赐教！