51单片机写74hc595 32×16点阵共阴led 分别定义p00,p01为ds,p02,p10,p11为ds,p12接口

以下是51单片机控制74hc595驱动32×16点阵共阴LED的代码，其中P00作为DS接口，P01作为ST_CP接口，P02、P10、P11、P12作为SH_CP接口：

#include <reg52.h>

#define uchar unsigned char
#define uint unsigned int

sbit DS = P0^0;
sbit ST_CP = P0^1;
sbit SH_CP1 = P0^2;
sbit SH_CP2 = P1^0;
sbit SH_CP3 = P1^1;
sbit SH_CP4 = P1^2;

uchar code num[10][16] = { // 数码管 0~9 的位图
    { // 0
        0x3E,0x7F,0x41,0x41,0x41,0x7F,0x3E,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 1
        0x00,0x42,0x7F,0x7F,0x40,0x00,0x00,0x00,
        0x00,0x00,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 2
        0x46,0x67,0x71,0x59,0x4D,0x67,0x63,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 3
        0x30,0x79,0x49,0x49,0x49,0x7F,0x36,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 4
        0x0F,0x0E,0x08,0x08,0x08,0x7F,0x7F,0x00,
        0x00,0x00,0x00,0x00,0x00,0x02,0x02,0x00
    },
    { // 5
        0x33,0x7B,0x49,0x49,0x49,0x7B,0x32,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 6
        0x3E,0x7F,0x49,0x49,0x49,0x7B,0x32,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 7
        0x01,0x01,0x01,0x71,0x7D,0x0F,0x07,0x00,
        0x00,0x00,0x00,0x02,0x02,0x02,0x02,0x00
    },
    { // 8
        0x36,0x7F,0x49,0x49,0x49,0x7F,0x36,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    },
    { // 9
        0x06,0x4F,0x49,0x49,0x49,0x7F,0x3E,0x00,
        0x00,0x02,0x02,0x02,0x02,0x02,0x02,0x00
    }
};

void delay(uint t) {
    uint i, j;
    for(i = 0; i < t; i++) {
        for(j = 0; j < 120; j++);
    }
}

void sendByte(uchar byte) { // 发送一个字节到74hc595
    uchar i;
    for(i = 0; i < 8; i++) {
        if(byte & 0x80) {
            DS = 1;
        } else {
            DS = 0;
        }
        byte <<= 1;
        SH_CP1 = 0;
        SH_CP2 = 0;
        SH_CP3 = 0;
        SH_CP4 = 0;
        SH_CP1 = 1;
        SH_CP2 = 1;
        SH_CP3 = 1;
        SH_CP4 = 1;
    }
}

void displayNum(uchar n) { // 显示数码管数字
    uchar i;
    for(i = 0; i < 16; i++) {
        sendByte(num[n][i]);
    }
}

void main() {
    uchar i, j, k;
    while(1) {
        for(i = 0; i < 4; i++) { // 每次显示4个数码管
            ST_CP = 0;
            for(j = 0; j < 4; j++) { // 依次输出4个字节
                if(j == i) { // 当前位为高电平
                    sendByte(0xFF);
                } else { // 其他位为低电平
                    sendByte(0x00);
                }
            }
            ST_CP = 1;
            for(k = 0; k < 10; k++) { // 显示数字0~9
                displayNum(k);
                delay(1000);
            }
        }
    }
}

注意，在这个例子中，我们使用了四个 SH_CP 接口，分别连接到 P0.2、P1.0、P1.1、P1.2 上，因为 74hc595 的移位寄存器有 8 位，而这个点阵有 32×16=512 个 LED 灯，所以需要 512/8=64 个 74hc595 芯片，每个芯片控制 8 个 LED 灯。为了控制这么多的芯片，我们需要使用多个 SH_CP 接口，使得每个 SH_CP 可以控制一部分芯片的移位寄存器。