stm8 stm8s单片机浮点数转四字节串口输出方案源程序（亲测可用）

注释掉的为转四字节方案
未注释掉的为直观显示数据方案

/******************************************************
定时器1中断1ms
******************************************************/
INTERRUPT_HANDLER(TIM1_UPD_OVF_TRG_BRK_IRQHandler, 11)
{
  /* In order to detect unexpected events during development,
     it is recommended to set a breakpoint on the following instruction.
  */
//  uint16_t i, j;
//
//  TIM1_ClearITPendingBit(TIM1_IT_UPDATE);
//  
//  
//  GPIO_WriteHigh(GPIOD, GPIO_PIN_3);
//  while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//  UART3_SendData8(1);
//  
//  for(i = 0; i < 60000; i++);
//  
//  GPIO_WriteLow(GPIOD, GPIO_PIN_3);
  static u16 time = 0;
  float root = 0;

//  u8 * p;
//  u8 ftc1, ftc2, ftc3, ftc4;
//  u8 high3, low3;
  TIM1_ClearITPendingBit(TIM1_IT_UPDATE);
  UartReadMonitor(1);



  if(time == 100)
  {
    GPIO_WriteHigh(GPIOD, GPIO_PIN_3);

    root = SF6Root(273,0.5);

    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8((u8)((unsigned int)(root/100)%10)+48);
    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8((u8)((unsigned int)(root/10)%10)+48);
    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8((u8)((unsigned int)(root/1)%10)+48);
    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8('.');  
    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8((u8)((unsigned int)(root*10)%10)+48);
    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8((u8)((unsigned int)(root*100)%10)+48);
    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
    UART3_SendData8((u8)((unsigned int)(root*1000)%10)+48);


//    p = (u8 *)(&root);
//   
//    high3 = (u8)root;
//    low3 = (u8)((root - high3)*100);
//   
//    ftc1 = *p++;
//    ftc2 = *p++;
//    ftc3 = *p++;
//    ftc4 = *p;
//    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//    UART3_SendData8(high3);
//    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//    UART3_SendData8(low3);
//    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//    UART3_SendData8(ftc4);
//    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//    UART3_SendData8(ftc3);
//    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//    UART3_SendData8(ftc2);
//    while(( UART3_GetFlagStatus(UART3_FLAG_TXE)==RESET));
//    UART3_SendData8(ftc1);
    time = 0;
  }
  time++;

}