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linux hid设备读写

www.myexceptions.net  网友分享于：2013-01-21   搜索量：13次

场景：linux下hid设备读写的有关问题

linux下hid设备读写的问题

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

int main(int argc,char **argv)

{

int fd;

int rtn,ret=0;

int i,j=0;

struct hiddev_report_info rinfo;

struct hiddev_usage_ref uref;

struct hiddev_field_info finfo;

struct hiddev_usage_ref_multi urefs;

struct hiddev_devinfo dinfo;

struct hiddev_collection_info cinfo;

unsigned char bufw[21]={0x02,0x08,0xce,0,0,0,0,0,0,0};

unsigned char recv[21]={0};

//printf("argc = %d\n",argc);

//打开设备文件

fd=open("/dev/usb/hiddev0",O_RDWR);

if(fd > 0)

{

printf("open hid success!,fd = %d\n",fd);

}

//

rinfo.report_type=HID_REPORT_TYPE_OUTPUT;

rinfo.report_id=HID_REPORT_ID_FIRST;

ret=ioctl(fd,HIDIOCGREPORTINFO,&rinfo);

if(ret != 0)

{

printf("ioctl one failed!\n");

close(fd);

return -1;

}

for(i=0;i

{

finfo.report_type=rinfo.report_type;

finfo.report_id=rinfo.report_id;

finfo.field_index=i;

ret = ioctl(fd,HIDIOCGFIELDINFO,&finfo);

printf("finfo.maxusage %d\n",finfo.maxusage);

if(ret != 0)

{

printf("ioctl two failed\n");

close(fd);

return -1;

}

//for(j=0;j

//{

uref.report_type=finfo.report_type;

uref.report_id=finfo.report_id;

uref.field_index=i;

uref.usage_index=j;//ioctl(fd,HIDIOCGUCODE,&uref);

ret = ioctl(fd,HIDIOCGUSAGE,&uref);

if(ret != 0)

{

printf("ioctl three faile!\n");

close(fd);

return -1;

}

ret = ioctl(fd,HIDIOCGUCODE,&uref);

printf("usage.value:%x\n",uref.value);

printf("usage report_type %d report_id %d field_index %d usage_index %d usage_code %d\n",

uref.report_type, uref.report_id, uref.field_index, uref.usage_index, uref.usage_code);

if(ret != 0)

{

printf("ioctl four failed\n");

close(fd);

return -1;

}

printf("\n");

//}

urefs.uref.report_type=HID_REPORT_TYPE_OUTPUT;

urefs.uref.report_id=finfo.report_id;

urefs.num_values=8;

urefs.uref.field_index=i;

urefs.uref.usage_index=0;

for(j=0;j<21;j++)

{

urefs.uref.usage_code+=4;

urefs.values[j]=bufw[j];

printf("usage report_type:%d,report_id:%d,field_index:%d,usage_index:%d,usage_code:%d\n", urefs.uref.report_id,urefs.uref.report_id,urefs.uref.field_index,urefs.uref.usage_index, urefs.uref.usage_code);

}

ret=ioctl(fd,HIDIOCSUSAGES,&urefs);//写入数据1

if(ret !=0)

{

printf("failed !\n");

close(fd);

return -1;

}

}

rinfo.report_type=HID_REPORT_TYPE_INPUT;

rinfo.report_id=HID_REPORT_ID_FIRST;

for(i=0;i

{

printf("num_field=%d\n",rinfo.num_fields);

finfo.report_type=rinfo.report_type;

finfo.report_id=rinfo.report_id;

finfo.field_index=i;

printf("finfo.report_id:%d\n",finfo.report_id);

ret =ioctl(fd,HIDIOCGFIELDINFO,&finfo);

if(ret !=0)

{

printf("ioctl five faile!\n");

close(fd);

return -1;

}

else

{

printf("finfo.report_id:%d\n",finfo.report_id);

}

}

for(i=0;i<21;i++)//打印结构体中是否有值。运行之后显示正确

{

printf("%3x",urefs.values[i]);

}

printf("\n");

ret=ioctl(fd,HIDIOCINITREPORT,0);

printf("ret = %d\n",ret);

memset(urefs.values,0,sizeof(urefs.values));//将结构体中用来存储数据的urefs.values置空

for(i=0;i<21;i++)

printf("%3x",urefs.values[i]);

ret=ioctl(fd,HIDIOCGUSAGES,&urefs);//接收数据，程序运行正确

printf("ret = %d\n",ret);

for(i=0;i<21;i++)//打印接收的值，运行后结果没有变，还是bufw的值

{

printf("%3x",urefs.values[i]);

}

printf("\n");

close(fd);

return 0;

}

编译通过，同时通过ioctl可以得到设备的相关信息，但是接收数据却是打印出原先bufw的值。如果要是和硬件通信成功，返回的应该是硬件返回到上层的值，在xp下用Bus Hound测得由硬件返回的值是{0x01,0x08,0xc8,0xca,0x00,0xff,0}。请问是错在哪里了？为何用ioctl接收到的值是错的？请各位指导下小弟。谢谢！

------解决方案--------------------

使用libusb很简单

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