Question

我有嵌入式系统项目，汽车监控系统我们在microC程序上使用c语言。

我决定写零件然后测试它我的想法是当我按下并释放（switch0）汽车将工作和＆＃34;电源＆＃34;将出现在液晶屏上，然后我必须按开关1作为安全带。

如果switch1 = 1，那么它将显示＆＃34; BF＆＃34;否则它会淹没＆＃34; BO＆＃34;。当我们进入switch0时，它会消除POWER AND BO，因为我们没有按下switch1。然而，即使按下开关1，除非我同时按下开关0和开关1，否则它不会出现BF！

这是我的代码：

sbit LCD_RS at RA1_bit;
sbit LCD_RW at RA2_bit;
sbit LCD_EN at RA3_bit;


sbit LCD_D4 at RD4_bit;
sbit LCD_D5 at RD5_bit;
sbit LCD_D6 at RD6_bit;
sbit LCD_D7 at RD7_bit;

sbit LCD_RS_Direction at TRISA1_bit;
sbit LCD_RW_Direction at TRISA2_bit;
sbit LCD_EN_Direction at TRISA3_bit;
sbit LCD_D4_Direction at TRISD4_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D7_Direction at TRISD7_bit;

sbit LED0 at RC0_bit;
sbit LED1 at RC1_bit;
sbit Switch0 at RB0_bit;
sbit Switch1 at RB1_bit;
sbit Switch2 at RB2_bit;
sbit Switch3 at RB3_bit;
int Num;


void main() {

ADCON1 = 0X07;               //a port as ordinary i/o.
TRISA = 0X00;                //a port as output.
TRISD = 0X00;                //d port as output.
TRISC = 0X00;
TRISB = 0X0F;
PORTC = 0b00000001;


Lcd_Init();                        // Initialize LCD
Delay_ms(200);
Lcd_Cmd(_LCD_CLEAR);                // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF);

LED0 = 0;
LED1= 0;

do {      
  if (Switch0) // if switch (RB1) is pressed
  {
      Delay_ms(20); // pause 20 mS
      while(Switch0); // Wait for release of the button
      Delay_ms(10);

      Lcd_Out(1, 7, "power");

      if (Switch1)
      {
          Delay_ms(10); // pause 20 mS
          while (Switch1); // Wait for release of the butto
          Delay_ms(10);
          Lcd_Out(2, 6, "BF");
          LED0 = 0;
      }
      else
      {
          Delay_ms(20);
          Lcd_Cmd(_LCD_CLEAR);
          Lcd_Out(2,1,"BO");
          LED0 = ~LED0;    
      }   
  }
} while(1);

}

Answer 1

这是因为您的第二个条件（switch1检查）位于第一个条件（switch0）内，因此在未按下电源按钮时无法检查皮带状态。您应该创建变量来存储汽车电源状态并在第一个条件下进行修改。第二个条件应该与第一个条件无关，并使用您的变量来检查汽车动力状态。例如：

 bool bPowerState;
//... 
   do {
      if (Switch0) // if switch (RB1) is pressed
      {
          bPowerState = !bPowerState;
          Delay_ms(20); // pause 20 mS
          while(Switch0); // Wait for release of the button
          Delay_ms(10);

       if(bPowerState)
         Lcd_Out(1,7,"power");
      }

      if (Switch1 && bPowerState)
      {
         Delay_ms(10); // pause 20 mS
         while (Switch1); // Wait for release of the butto
         Delay_ms(10);
         Lcd_Out(2,6,"BF");
         LED0=0;
       }else{
         Delay_ms(20);
         Lcd_Cmd(_LCD_CLEAR);
         Lcd_Out(2,1,"BO");
         LED0=~LED0;
       }
    }while(1);

汽车监控系统嵌入式项目

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