MSP430G2553 模拟交通灯

#include <msp430.h>

typedef unsigned char uchar;
typedef unsigned int uint;

const uchar STATES[4] = { 0xCC, 0xD4, 0x78, 0xAC };
volatile uint i, j, current = 0;

int main(void){
	WDTCTL = WDTPW | WDTHOLD;
	
	P1DIR = 0xFF;
	P1OUT = 0xDB;//所有红灯亮
	
    while(1){
        for(i = 10000; i > 0; i--)
            ;
        P1OUT = STATES[current];
        
        if(current == 1){
            //黄灯闪烁
            for(j = 8; j > 0; j--){
                for(i = 5000; i > 0; i--)
                    ;
                P1OUT ^= 0x08;
            }
        }
        else if(current == 3){
            //黄灯闪烁
            for(j = 8; j > 0; j--){
                for(i = 5000; i > 0; i--)
                    ;
                P1OUT ^= 0x40;
            }
        }

        //两种情况合并
        // if(current == 1 || current == 3){
        //    
        //     uchar bit_of_yellow_light = current == 1 ? 0x08 : 0x40;
        //
        //     for(j = 8; j > 0; j--){
        //         for(i = 5000; i > 0; i--)
        //             ;
        //         P1OUT ^= bit_of_yellow_light;
        //     }
        // }

        current = current == 3 ? 0 : current + 1;
    }
}