颜色传感器(TCS230)接口不能与ATMEGA16一起工作？

Question

先生，我不知道为什么我的颜色传感器的C代码不能工作。我使用的是ATMEGA16单片机，使用的传感器是TCS230传感器，它与单片机的引脚PB0(PORTB0)相连。请帮帮我，我在这里附上我的c代码--请记住，我正在使用20%的缩放，并且已经用1(VCC)和0(Gnd)连接了S0和S1引脚。

  #define S2 PA0
  #define S3 PA1 
  #define F_CPU 11.0592
  #include <util/delay.h>
  #include<avr/io.h>
  #include<avr/interrupt.h>
  //Variable declarations
  unsigned char state;
  unsigned int counter_r,counter_g,counter_b,counter_no;
  unsigned char i=0; //to store value of counter
  unsigned char flag=0;
void chkcolour();

 int main()
  { 
    DDRB=0x00; //PB0 and T0(counter pin ) Input
    DDRA=0xFF; //PA2(R),PA3(G) & PA4(B) for RGB LED ,PA0(S2) & PA1(S3) for RGB selection ,Output Pins
    TCNT0=0x00;
    TCCR0=0x07;
    state=0; //start from 0 then 1,2,then again same

     sei();

    while(1)
     { flag=0;
switch(state)
{
   case 0:

       PORTA=0b00000000; //For Red
        _delay_ms(1000);
        counter_r=TCNT0;
        TCNT0=0x00;
        state=1;

   case 1:       

       PORTA=0b00000010; //For blue
        _delay_ms(1000);
       counter_b=TCNT0;
       TCNT0=0x00;
       state=2;

   case 2:  
         PORTA=0b00000011; //For Green
         _delay_ms(1000);
         counter_g=TCNT0;
         TCNT0=0x00;
         state=3;

   case 3:
       PORTA=0b00000001; //No Filter
       _delay_ms(1000);
       counter_no=TCNT0;
       TCNT0=0x00;
       state=0;
       break;

 } 


chkcolour();

}

return 0;
}



void chkcolour()
{


        if((counter_r > counter_b) && (counter_r > counter_g) )
            {
          PORTA=0b00000100; //Glow RED LED,Off Green LED,Off Blue LED 
          flag=1;


           }    

        else if((counter_g > counter_r) && (counter_g > counter_b))
         {
         PORTA=0b00001000; //Glow GEREEN LED,Off RED LED,Off Blue LED 
         flag=1;


          } 

         else if((counter_b > counter_r) && (counter_b > counter_g)  )
         {
         PORTA=0b00010000; //Glow BLUE LED,Off RED LED,Off GREEN LED 
         flag=1;


          } 


    else 
          {
         PORTA=0b00000000; //0ff GEREEN LED,Off RED LED,Off Blue LED 
         flag=1;


          }


}    

Answer 1

很多问题。

1)不要忘记在每个case块之后将break添加到开关中

2)对端口A的赋值覆盖此端口中的先前值。也就是说，在这个结构中：

     PORTA=(0<<PORTA2); //Off RED LED 
     PORTA=(1<<PORTA3); //Glow Green LED 
     PORTA=(0<<PORTA4); //off Blue LED 

PORTA的所有输出上都会有一个零(最后一行)。

3)甚至，如果一些东西将在chkcolour()中发送到PORTA，它将在接下来的几微秒内被覆盖，因为在下一次迭代中它将被赋值：

   PORTA=(0<<S3) | (0<<S2) ; //For Red

要设置或清除位，请使用如下结构：

PORTA |= (1 << bitnum); // to set a bit
PORTA &= ~(1 << bitnum); // to clear (note bitwise negation ~ symbol)