snprintf实用 - 打印spi的输出

实验：

#include <stdio.h>

int main()
{
    unsigned int i = 0;
    unsigned char arr[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99};
    char buff[100] = {0};

    printf("spi write spi1:1");
    for (i = 0; i < (sizeof(arr)/sizeof(unsigned char)); i++)
    {
        //snprintf(buff+(5*i), 6, " %#02x", arr[i]); //%# can't work for Ox00
        snprintf(buff+(5*i), 6, " 0x%02x", arr[i]);
    }

    printf("%s\n", buff);

    return 0;
}

输出：

spi write spi1:1 0x00 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 0x99

参考：sprintf与snprintf区别