单片机程序，定义一个数组 char SEGS[32] 其中前180个位(bit)为有效位，最后4个无效。在这180个位中随机7个位组成一个7段式的led数字8。共有14个led数字，请教高手有什么好办法对这些数字赋值，谢谢！

笨办法是：
//                 a ,b ,c ,d ,e ,f ,g
char number1[6] = {xx,xx,xx,xx,xx,xx,xx}  //xx 是在SEGS[]里的bit的位数


void set_seg(unsigned char seg_number)
{
    unsigned char seg_byte = 0,seg_bit = 0,data = 0;
    seg_byte = seg_number/8;
    seg_bit  = seg_number%8;
    data |= 1<<seg_bit;
    SEGS[byte] = data;
}

void clear_seg(unsigned char seg_number)
{
    unsigned char seg_byte = 0,seg_bit = 0,data = 0;
    seg_byte = seg_number/8;
    seg_bit  = seg_number%8;
    data &= ~(1<<seg_bit);
    SEGS[byte] = data;
}

void set_number1(unsigned char number)
{
    switch (number)
    {
        case 0:
        {
            set_seg(number1[0]);
            clear_seg(number1[1]);
                    .
                    .
                    .
                    .
                    .
            set_seg(number1[6]);
        }break;
        case 1:
        .
        .
        .
        case 9   
    }   
}

思路：有没有一个办法可以把任意的几个位组成一个数组，就像内存映射那样打乱顺序，再按要求组合？？

随机的7位是起始位随机还是任意位随机？这个随机是自己控制还是其他部分代码确定或者说给出的

反正怎么想你都应该把0-9初始化的

[此贴子已经被作者于2015-11-30 19:11编辑过]

位置是给出的而且固定，和其它程序无关，初始化有两种，一是0，二是不显

#include <stdio.h>

#define BITE_SIZE 8

typedef unsigned char uchar;

// 0-f的7段码初始化，低7位可用
uchar flag[] = { 0x3f, 0x6, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x7, 0x7f, 0x6f, 0x77,
        0x7c, 0x39, 0x5e, 0x7d, 0x71 };

void print(uchar *str, size_t n)
{
    printf("%d", 0x1 & str[n / BITE_SIZE] >> (BITE_SIZE - n % BITE_SIZE - 1));
}

void set_num(uchar *str, size_t beg, int num)
{
    int realpos = beg / BITE_SIZE;
    int bitbeg = BITE_SIZE - beg % BITE_SIZE - 1;

    for (int i = 6;i >= 0;i--)
    {
        if (0x1 & flag[num] >> i) str[realpos] |= 0x1 << bitbeg;
        else str[realpos] &= ~(0x1 << bitbeg);

        realpos += bitbeg == 0;
        bitbeg = (bitbeg + 7) % BITE_SIZE;
    }
}

int main(int argc, char *argv[])
{
    uchar SEGS[32] = { 0 };

    for (size_t i = 0;i < sizeof(flag);i++)
    {
        set_num(SEGS, i * 8, i);
    }
    for (size_t i = 0;i < 32 * 8;i++)
    {
        if (i % 8 == 0) puts("");
        print(SEGS, i);
    }
    return 0;
}

realpos += bitbeg == 0;  这句是什么意思？

相当于

if (bitbeg == 0)  realpos++;

谢谢 azzbcc 的指导