MSP430G2553共阴数码管通过按键显示

以下是MSP430G2553共阴数码管通过按键显示的示例代码：

#include <msp430g2553.h>

#define LED1 BIT0
#define LED2 BIT6
#define KEY1 BIT3
#define KEY2 BIT4
#define KEY_DELAY 30000

const unsigned char DIGITS[10] = {
    0x3F, 0x06, 0x5B, 0x4F, 0x66, 
    0x6D, 0x7D, 0x07, 0x7F, 0x6F
};

unsigned char digit = 0;

void delay(unsigned int n)
{
    unsigned int i;
    for(i = 0; i < n; i++);
}

void display(unsigned char n)
{
    P1OUT &= ~(BIT1 + BIT2 + BIT4 + BIT5);
    P2OUT &= ~(BIT0 + BIT1 + BIT2 + BIT3);
    
    switch(n) {
        case 0: P1OUT |= BIT1 + BIT2 + BIT4 + BIT5; break;
        case 1: P2OUT |= BIT0 + BIT1; break;
        case 2: P1OUT |= BIT1 + BIT2 + BIT5; P2OUT |= BIT0 + BIT3; break;
        case 3: P1OUT |= BIT1 + BIT2 + BIT4 + BIT5; P2OUT |= BIT0 + BIT3; break;
        case 4: P1OUT |= BIT2 + BIT4; P2OUT |= BIT0 + BIT1 + BIT3; break;
        case 5: P1OUT |= BIT1 + BIT2 + BIT4; P2OUT |= BIT1 + BIT3; break;
        case 6: P1OUT |= BIT1 + BIT4; P2OUT |= BIT1 + BIT2 + BIT3 + BIT0; break;
        case 7: P1OUT |= BIT1 + BIT2 + BIT4 + BIT5; P2OUT |= BIT0 + BIT1; break;
        case 8: P1OUT |= BIT1 + BIT2 + BIT4 + BIT5; P2OUT |= BIT0 + BIT1 + BIT2 + BIT3; break;
        case 9: P1OUT |= BIT1 + BIT2 + BIT4; P2OUT |= BIT0 + BIT1 + BIT3; break;
    }
}

void main(void)
{
    WDTCTL = WDTPW + WDTHOLD;
    
    P1DIR |= BIT0 + BIT1 + BIT2 + BIT4 + BIT5;
    P2DIR |= BIT0 + BIT1 + BIT2 + BIT3;
    P1OUT &= ~(BIT0 + BIT1 + BIT2 + BIT4 + BIT5);
    P2OUT &= ~(BIT0 + BIT1 + BIT2 + BIT3);
    
    P1DIR &= ~(KEY1 + KEY2);
    P1REN |= KEY1 + KEY2;
    P1OUT |= KEY1 + KEY2;
    
    while(1) {
        if((P1IN & KEY1) == 0) {
            digit++;
            if(digit > 9) digit = 0;
            delay(KEY_DELAY);
        }
        if((P1IN & KEY2) == 0) {
            digit--;
            if(digit < 0) digit = 9;
            delay(KEY_DELAY);
        }
        display(DIGITS[digit]);
        delay(10000);
    }
}

此代码可以让您使用KEY1和KEY2按键来增加和减少数字，然后在数码管上显示它。您可以更改数字的初始值，以便在开始时显示您想要的数字。