Qt下libusb-win32的使用（转）

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源：Qt下libusb-win32的使用(一)打印设备描述符

主要是在前一篇的基础上，学习libusb-win32的API使用。程序很简单，就是打印指定USB设备的设备描述符(当然其他描述符也是可以的)。

#include "testlibusb.h"#define MY_VID 0x5345
#define MY_PID 0x1234USB::USB()
{
usb_init(); /* initialize the library */
//usb_set_debug(255);
usb_find_busses(); /* find all busses */
usb_find_devices(); /* find all connected devices */ if (!(udev = open_dev())) {
qDebug("error opening device: %s", usb_strerror());
exit();
} else
qDebug("open success: device %04X:%04X opened", MY_VID, MY_PID); printf_device_descriptor(&dev->descriptor);
usb_close(udev); //my_usb_get_device_list();
resize(, );
}usb_dev_handle *USB::open_dev(void)
{
struct usb_bus *bus;
//struct usb_device *dev; for(bus = usb_get_busses(); bus; bus = bus->next) {
for(dev = bus->devices; dev; dev = dev->next) {
if((dev->descriptor.idVendor == MY_VID) && (dev->descriptor.idProduct == MY_PID)) {
return usb_open(dev);
}
}
}
return ;
}void USB::printf_device_descriptor(usb_device_descriptor *desc)
{
qDebug("bLength: %u", desc->bLength);
qDebug("bDescriptorType: %02Xh", desc->bDescriptorType);
qDebug("bcdUSB: %04Xh", desc->bcdUSB);
qDebug("bDeviceClass: %02Xh", desc->bDeviceClass);
qDebug("bDeviceSubClass: %02Xh", desc->bDeviceSubClass);
qDebug("bDeviceProtocol: %02Xh", desc->bDeviceProtocol);
qDebug("bMaxPacketSize0: %02Xh", desc->bMaxPacketSize0);
qDebug("idVendor: %04Xh", desc->idVendor);
qDebug("idProduct: %04Xh", desc->idProduct);
qDebug("bcdDevice: %04Xh", desc->bcdDevice);
qDebug("iManufacturer: %u", desc->iManufacturer);
qDebug("iProduct: %u", desc->iProduct);
qDebug("iSerialNumber: %u", desc->iSerialNumber);
qDebug("bNumConfigurations: %u", desc->bNumConfigurations);
}

这里我指定的USB设备是Tiny6410开发板。运行效果如下：

下一步就是上位机与开发板进行数据互传。

源：Qt下libusb-win32的使用(二)批量读写操作

一、概述

学习libusb-win32的使用。使用批量传输方式与USB开发板进行数据读、写操作。上位机使用Qt做界面，使用USB开发板的端点2作为批量传输端点。

二、实现

代码比较简单，直接给出，如下：

#include "testlibusb.h"//for Tiny6410
//#define MY_VID 0x5345
//#define MY_PID 0x1234//for 51 USB Board
#define MY_VID 0x8888
#define MY_PID 0x0001// Device configuration and interface id.
#define MY_CONFIG 1
#define MY_INTF 0// Device endpoint 2
#define EP_IN 0x82
#define EP_OUT 0x02// Device of bytes to transfer.
#define BUF_SIZE 64//#define DEBUG_GUIUSB::USB()
{
#ifndef DEBUG_GUI usb_init(); /* initialize the library */
//usb_set_debug(255);
usb_find_busses(); /* find all busses */
usb_find_devices(); /* find all connected devices */ if (!(udev = open_dev())) {
qDebug("error opening device: %s", usb_strerror());
exit();
} else
qDebug("open success: device %04X:%04X opened", MY_VID, MY_PID); printf_device_descriptor(&dev->descriptor);
my_init_usbdev();
#endif textEdit = new QTextEdit(this);
textEdit->setGeometry(,,,); sendButton = new QPushButton(this);
sendButton->setText("send");
sendButton->setGeometry(,,,);
connect(sendButton,SIGNAL(clicked()),this,SLOT(send_slot())); readButton = new QPushButton(this);
readButton->setText("read");
readButton->setGeometry(,,,);
connect(readButton,SIGNAL(clicked()),this,SLOT(read_slot())); recvLabel = new QLabel(this);
recvLabel->setText("recv data:");
recvLabel->setGeometry(,,,); //my_usb_get_device_list();
resize(, );
}//关闭程序时被调用
USB::~USB()
{
#ifndef DEBUG_GUI
qDebug("close usb device.");
usb_close(udev);
#endif
}//打开指定VID、PID的USB设备
usb_dev_handle *USB::open_dev(void)
{
struct usb_bus *bus; for(bus = usb_get_busses(); bus; bus = bus->next) {
for(dev = bus->devices; dev; dev = dev->next) {
if((dev->descriptor.idVendor == MY_VID) && (dev->descriptor.idProduct == MY_PID)) {
return usb_open(dev);
}
}
}
return ;
}//打印USB设备描述符
void USB::printf_device_descriptor(usb_device_descriptor *desc)
{
qDebug("bLength: %u", desc->bLength);
qDebug("bDescriptorType: %02Xh", desc->bDescriptorType);
qDebug("bcdUSB: %04Xh", desc->bcdUSB);
qDebug("bDeviceClass: %02Xh", desc->bDeviceClass);
qDebug("bDeviceSubClass: %02Xh", desc->bDeviceSubClass);
qDebug("bDeviceProtocol: %02Xh", desc->bDeviceProtocol);
qDebug("bMaxPacketSize0: %02Xh", desc->bMaxPacketSize0);
qDebug("idVendor: %04Xh", desc->idVendor);
qDebug("idProduct: %04Xh", desc->idProduct);
qDebug("bcdDevice: %04Xh", desc->bcdDevice);
qDebug("iManufacturer: %u", desc->iManufacturer);
qDebug("iProduct: %u", desc->iProduct);
qDebug("iSerialNumber: %u", desc->iSerialNumber);
qDebug("bNumConfigurations: %u", desc->bNumConfigurations);
}//指定USB设备的配置和接口
void USB::my_init_usbdev()
{
//libusb规定下面这两个函数必须要被调用
if (usb_set_configuration(udev, MY_CONFIG) < ) {
qDebug("error setting config #%d: %s", MY_CONFIG, usb_strerror());
exit();
}
if (usb_claim_interface(udev, MY_INTF) < ) {
qDebug("error claiming interface #%d:\n%s", MY_INTF, usb_strerror());
exit();
}
}//发送按钮响应函数
void USB::send_slot()
{
int ret, num;
QString s = textEdit->toPlainText();
QByteArray a = s.toLatin1();
char *tmp = a.data(); num = s.length();
//qDebug()<<"text: "<<tmp<<"length: "<<num;
//批量写(同步)
ret = usb_bulk_write(udev, EP_OUT, tmp, num, );
if (ret < ) {
qDebug("error writing: %s", usb_strerror());
exit();
}
}//读按钮响应函数
void USB::read_slot()
{
int ret;
char readdata[BUF_SIZE]; //批量读(同步)
ret = usb_bulk_read(udev, EP_IN, readdata, sizeof(readdata), );
if (ret < ) {
qDebug("error reading:%s", usb_strerror());
exit();
}
readdata[ret] = '\0';
//将接收到的数据显示在Label上
recvLabel->setText("recv: " + QLatin1String(readdata));
}