级联驱动74HC595

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级联驱动74HC595 [复制链接]

1. #include

2. void SetHC(unsigned char a){

   P1DIR |= BIT0 + BIT1 + BIT2; //DS ST_CP SH_CP

   unsigned char i;

   for(i=0;i<8;i++){

   P1OUT &= ~BIT2;

   if((a & 0x80) == 0x80){

   P1OUT |= BIT0;

   }else{

   P1OUT &= ~BIT0;

   }

   P1OUT |= BIT2;

   a<<=1;

   }

   P1DIR &= ~(BIT0 + BIT1 +BIT2);

   }

3. void OutHC(){

   P1DIR |= BIT1;

   P1OUT &= ~BIT1;

   P1OUT |= BIT1;

   }

4. int main(void)

   {

6. WDTCTL = WDTPW + WDTHOLD; // 关闭看门狗

   P1DIR &= ~BIT6;//输入测试

7. SetHC(0xaa);//2级

   SetHC(0x0f);//1级

   OutHC();

8. while(1);

   }

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