指针 8位转32 的读写技巧

关键是把unsigned char *转换成unsigned int *

读操作:

static void read_buf(u_char *buf, int len)
{   
    unsigned int idx,num;
    num = (len>>2);
    for (idx=0; idx< num; idx++)
        ((u_int*)buf)[idx] = reg32(reg);       

    //余数
    for (idx= num<<2; idx< len ; idx++)
        buf[idx] = reg8(reg);

}

 

写操作:

static void write_buf(const u_char *buf, int len)
{
    unsigned int idx,num;
    num = (len>>2);
    for (idx=0; idx< num; idx++)
        reg32(reg) = ((u_int*)buf)[idx];       

    //余数
    for (idx= num<<2; idx< len ; idx++)
        reg8(reg) = buf[idx];

}