问通过串口到目标设备的Linux串口- wrtie( )字节

EN

unsigned char cmd[] = {'A', 'T', '+', "0x07", "0x08", 'D', 'F', "0xA6"};

41 54 2b 07 08 44 46 A6 

41 54 2b b8 bb 44 46 be

0x07 0x08 0xA6

void WriteToDevice(){
unsigned char cmd[]={'A', 'T', '+', "0x07", "0x08", 'D', 'F', "0xA6"};
int n = write(fd,&cmd,8);

for(p=0;p<8;p++){
    printf("bytes written: %02x \n", cmd[p]);
}

if(n<0){
    printf("write error \n");
}
else{
    printf("%d bytes written \n", n);
}

};

warning: (near initialization for ‘cmd[3]’) [enabled by default]
warning: initialization makes integer from pointer without a cast [enabled by default]