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关于java 读取propterties 文件的疑惑 和问题的解决[转载]
Libusb库的使用
转自:http://blog.sina.com.cn/s/blog_4a5b632801009upv.html
使用libusb之前你的linux系统必须装有usb文件系统，这里还介绍了使用hiddev设备文件来访问设备，目的在于不仅可以比较出usb的易用性，还提供了一个转化成libusb驱动的案例。
3.1 find设备
任何驱动第一步首先是寻找到要操作的设备，我们先来看看HID驱动是怎样寻找到设备的。我们假设寻找设备的函数Device_Find(注：代码只是为了方便解说，不保证代码的健全)
int Device_Find()
{
<wbr> </wbr><wbr> </wbr><wbr> char dir_str[100]; </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> char hiddev[100]; </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
DIR dir; <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
memset (dir_str, 0 , sizeof(dir_str));
memset (hiddev, 0 , sizeof(hiddev));
<wbr> </wbr><wbr> </wbr><wbr></wbr>
dir=opendir("/dev/usb/hid");
<wbr> </wbr><wbr> </wbr><wbr> if(dir){</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> sprintf(dir_str,"/dev/usb/hid/");</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> closedir(dir);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }else{</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> sprintf(dir_str,"/dev/usb/");</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
for(i = 0; i < DEVICE_MINOR; i++) {
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> sprintf(hiddev, "%shiddev%d", dir_str,i);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> fd = open(hiddev, O_RDWR);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> if(fd > 0) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> ioctl(fd, HIDIOCGDEVINFO, &info);</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> if(info.vendor== VENDOR_ID && info.product== PRODUCT_ID) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> device_num++; </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> close(fd);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr> return device_num; </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
}
我们再来看libusb是如何来寻找和初始化设备
int Device_Find()
{
struct usb_bus <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> *busses;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> int </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> device_num = 0;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> device_num = 0; </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> usb_init(); </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> usb_find_busses(); </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> usb_find_devices();</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
busses = usb_get_busses();
<wbr> </wbr><wbr> </wbr><wbr> struct usb_bus </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> *bus;</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> for (bus = busses; bus; bus = bus->next) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> struct usb_device *dev;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> for (dev = bus->devices; dev; dev = dev->next) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
if(dev->descriptor.idVendor==VENDOR_ID&& dev->descriptor.idProduct == PRODUCT_ID) {
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> device_num++; </wbr><wbr> </wbr><wbr></wbr>
} <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> } </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr> return device_num; </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
}
注：在新版本的libusb中，usb_get_busses就可以不用了，这个函数是返回系统上的usb总线链表句柄
这里我们直接用usb_busses变量，这个变量在usb.h中被定义为外部变量
所以可以直接写成这样：
struct usb_bus <wbr> </wbr><wbr> *bus;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> for (bus = usb_busses; bus; bus = bus->next) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> struct usb_device *dev;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> for (dev = bus->devices; dev; dev = dev->next) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> }</wbr>
}
3.2 打开设备
假设我们定义的打开设备的函数名是device_open,
int Device_Open()
{
<wbr> </wbr><wbr> </wbr><wbr> int handle;</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
handle = open(“hiddev0”, O_RDONLY);
}
int Device_Open()
{
struct usb_device* <wbr> </wbr><wbr> </wbr><wbr> udev;</wbr>
usb_dev_handle* <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> device_handle;</wbr>
device_handle = usb_open(udev);
}
3.3 读写设备和操作设备
假设我们的设备使用控制传输方式，至于批处理传输和中断传输限于篇幅这里不介绍
我们这里定义三个函数，Device_Write, Device_Read, Device_Report
Device_Report 功能发送接收函数
Device_Write 功能写数据
Device_Read <wbr> </wbr><wbr> 功能读数据</wbr>
Device_Write和Device_Read调用Device_Report发送写的信息和读的信息，开发者根据发送的命令协议来设计，我们这里只简单实现发送数据的函数。
假设我们要给设备发送72字节的数据，头8个字节是报告头，是我们定义的和设备相关的规则，后64位是数据。
HID驱动的实现(这里只是用代码来有助理解，代码是伪代码)
int Device_Report(int fd, unsigned char *buffer72)
{
int <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> ret;</wbr>
int <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> index;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> unsigned char send_data[72];</wbr>
unsigned char recv_data[72];
<wbr> </wbr><wbr> </wbr><wbr> struct hiddev_usage_ref uref;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> struct hiddev_report_info rinfo;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> ret = ioctl(fd, HIDIOCINITREPORT, 0);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> if( ret !=0) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return NOT_OPENED_DEVICE;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> for(index = 0; index < 72; index++) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.report_type = HID_REPORT_TYPE_FEATURE;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.report_id = HID_REPORT_ID_FIRST;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.usage_index = index;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.field_index = 0;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.value = send_data[index];</wbr>
<wbr> </wbr><wbr> </wbr><wbr> ioctl(fd, HIDIOCGUCODE, &uref);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> ret=ioctl(fd, HIDIOCSUSAGE, &uref);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> if(ret != 0 ){</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return UNKNOWN_ERROR;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
}
rinfo.report_type = HID_REPORT_TYPE_FEATURE;
rinfo.report_id = HID_REPORT_ID_FIRST;
rinfo.num_fields = 1;
ret=ioctl(fd, HIDIOCSREPORT, &rinfo); <wbr> </wbr><wbr></wbr>
if(ret != 0) {
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return WRITE_REPORT;</wbr>
}
ret = ioctl(fd, HIDIOCINITREPORT, 0);
for(index = 0; index < 72; index++) {
<wbr> </wbr><wbr> </wbr><wbr> uref.report_type = HID_REPORT_TYPE_FEATURE;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.report_id = HID_REPORT_ID_FIRST;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.usage_index = index;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> uref.field_index = 0;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> ioctl(fd, HIDIOCGUCODE, &uref);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> ret = ioctl(fd, HIDIOCGUSAGE, &uref);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> if(ret != 0 ) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return UNKNOWN_ERROR;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr> recv_data[index] = uref.value;</wbr>
}
memcpy(buffer72, recv_data, 72);
return SUCCESS;
}
libusb驱动的实现
int Device_Report(int fd, unsigned char *buffer72)
{
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> usb_dev_handle* Device_handle;</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> unsigned char </wbr><wbr> </wbr><wbr> send_data[72];</wbr>
<wbr> </wbr><wbr> </wbr><wbr> unsigned char </wbr><wbr> </wbr><wbr> recv_data[72];</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> int </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> send_len;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> int </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> recv_len;</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> memset(send_data, 0 , sizeof(send_data));</wbr>
<wbr> </wbr><wbr> </wbr><wbr> memset(recv_data, 0 , sizeof(recv_data));</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> Device_handle = (usb_dev_handle*)(g_list[fd].device_handle);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> if (Device_handle == NULL) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return NOT_OPENED_DEVICE;</wbr>
}
usb_claim_interface(Device_handle, 0);
send_len = usb_control_msg(Device_handle,
USB_ENDPOINT_OUT + USB_TYPE_CLASS + USB_RECIP_INTERFACE,
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> HID_REPORT_SET,</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> 0x300,</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> 0,</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> send_data, 72, USB_TIMEOUT);</wbr>
if (send_len < 0) {
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return WRITE_REPORT;</wbr>
}
if (send_len != 72) {
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return send_len;</wbr>
}
recv_len = usb_control_msg(Device_handle,
USB_ENDPOINT_IN + USB_TYPE_CLASS + USB_RECIP_INTERFACE,
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> HID_REPORT_GET,</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> 0x300,</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> 0,</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> recv_data, 72, USB_TIMEOUT);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> if (recv_len < 0) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> printf("failed to retrieve report from USB device!\n");</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return READ_REPORT;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> if (recv_len != 72) {</wbr>
<wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> return recv_len;</wbr>
<wbr> </wbr><wbr> </wbr><wbr> }</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
<wbr> </wbr><wbr> </wbr><wbr> usb_release_interface(RY2_handle, 0);</wbr>
<wbr> </wbr><wbr> </wbr><wbr> memcpy(buffer72, recv_data, 72);</wbr>
return SUCCESS;
}
3.4 关闭设备
假设我们定义的关闭设备的函数名是Device_Close()
int Device_Close()
{
<wbr> </wbr><wbr> </wbr><wbr> int handle;</wbr>
<wbr> </wbr><wbr> </wbr><wbr></wbr>
handle = open(“hiddev0”, O_RDONLY);
close( handle );
}
int Device_Close()
{
struct usb_device* <wbr> </wbr><wbr> </wbr><wbr> udev;</wbr>
usb_dev_handle* <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> device_handle;</wbr>
device_handle = usb_open(udev);
usb_close(device_handle);
}
libusb的驱动框架
前面我们看了些主要的libusb函数的使用，这里我们把前面的内容归纳下：
一般的驱动应该都包含如下接口：
Device_Find();
Device_Open();
Device_Write();
Device_Read();
Device_Close();
具体代码如下：
#include <usb.h>typedef struct{ <wbr> </wbr><wbr> </wbr><wbr> struct usb_device* </wbr><wbr> </wbr><wbr> </wbr><wbr> udev;</wbr> <wbr> </wbr><wbr> </wbr><wbr> usb_dev_handle* </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> device_handle;</wbr> <wbr> </wbr><wbr> </wbr><wbr></wbr>} device_descript;#define USB_TIMEOUT <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> 10000</wbr>#define VENDOR_ID <wbr> </wbr><wbr> </wbr><wbr> 0xffff </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr>#define PRODUCT_ID <wbr> </wbr><wbr> 0xffff</wbr>#define DEVICE_MINOR 16int <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> g_num;</wbr>device_descript g_list[ DEVICE_MINOR ];int Device_Find(){ <wbr> </wbr><wbr> </wbr><wbr> struct usb_bus </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> *bus;</wbr> <wbr> </wbr><wbr> </wbr><wbr> struct usb_device *dev;</wbr> <wbr> </wbr><wbr> </wbr><wbr> g_num = 0;</wbr> <wbr> </wbr><wbr> </wbr><wbr> usb_find_busses();</wbr> <wbr> </wbr><wbr> </wbr><wbr> usb_find_devices();</wbr> <wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> for (bus = usb_busses; bus; bus = bus->next) {</wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> for (dev = bus->devices; dev; dev = dev->next) {</wbr>if(dev->descriptor.idVendor==VENDOR_ID&& dev->descriptor.idProduct == PRODUCT_ID) { <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> if (g_num < DEVICE_MINOR) {</wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> g_list[g_num].udev = dev; </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> g_num ++;</wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> } </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> } </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> }</wbr> <wbr> </wbr><wbr> </wbr><wbr> }</wbr> <wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> return g_num;</wbr>}int Device_Open(){ <wbr> </wbr><wbr> </wbr><wbr></wbr> <wbr> </wbr><wbr> </wbr><wbr> if(g_list[g_num].udev != NULL) {
</wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> </wbr><wbr> g_list[g_num].device_handle = usb_open(g_list[g_num].udev);</wbr>}}int DeviceWite(int handle){ <wbr> </wbr><wbr> </wbr><wbr></wbr>}int DeviceOpen(int handle){ <wbr> </wbr><wbr> </wbr><wbr></wbr>}void Device_close(int handle){ <wbr> </wbr><wbr> </wbr><wbr></wbr>}</wbr>
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