使用PyUSB发送HID报告

问题描述

更新

我设法正确发送了数据.对于遇到相同问题的任何人，我都使用以下代码:

I managed to send the data properly. For anyone who ran into the same problem, I used the following code:

data=[0x00, 0x04, 0x04, 0xFF, 0xFF, 0xFF, 0x00, 0x00]
result=dev.ctrl_transfer(0x21, 0x9, wValue=0x200, wIndex=0x00, data_or_wLength=data)

(这是基于此处发布的答案:链接)

(This is based on the answer posted here: link)

但是我不清楚，为什么我必须使用

But I don't understand in detail, why I have to use

bmRequestType=0x21
bRequest=0x9
wValue=0x200

解释是什么?

初始请求:

我正拼命尝试使用PyUSB向HID设备发送简单的报告.

I'm desperately trying to send a simple report to a HID-device using PyUSB.

使用"SimpleHIDwrite"我确认该设备可以正常工作.我要发送此数据:

Using "SimpleHIDwrite" I confirmed that the device works just as expected. I want to send this data:

报告ID:00

数据:[00，04，04，FF，FF，FF，00，00]

data: [00, 04, 04, FF, FF, FF, 00, 00]

使用SimpleHIDwrite发送数据

我对Python和USB还是很陌生，无法弄清楚如何使用dev.ctrl_transfer或dev.write.

I'm quite new to Python and USB and I can't figure out how to do this using dev.ctrl_transfer or dev.write.

也有一些关于将数据发送到HID设备的文章，但是我不知道如何解决我的问题.我该如何解决?

Also, there are some posts about sending data to HID devices, but I couldn't figure out how to solve my problem. How can I fix it?

以下是更多详细信息:

 # Based on https://github.com/walac/pyusb/blob/master/docs/tutorial.rst

import usb.core
import usb.util

# Find our device
# dev = usb.core.find(idVendor=0xfffe, idProduct=0x0001)
dev = usb.core.find(idVendor=0x1781, idProduct=0x8c0)


# Was it found?
if dev is None:
    raise ValueError('Device not found')

dev.set_configuration()

cfg = dev[0]
intf = cfg[(0,0)]
ep = intf[0]

# dev.write(ep.bEndpointAddress, [0x00, 0x00,0x04,0x04,0xFF,0xFF,0xFF,0x00, 0x00], 1000)
# dev.ctrl_transfer(bmRequestType, bRequest, wValue=0, wIndex=0, data_or_wLength=None, timeout=None)

print("print ep")
print(ep)
print("print cfg")
print(cfg)
print("print intf")
print(intf)

上面脚本的结果是这样的:

And the result of the script above is this:

print ep
      ENDPOINT 0x81: Interrupt IN ==========================
       bLength          :    0x7 (7 bytes)
       bDescriptorType  :    0x5 Endpoint
       bEndpointAddress :   0x81 IN
       bmAttributes     :    0x3 Interrupt
       wMaxPacketSize   :    0x8 (8 bytes)
       bInterval        :    0xa
print cfg
  CONFIGURATION 1: 100 mA ==================================
   bLength              :    0x9 (9 bytes)
   bDescriptorType      :    0x2 Configuration
   wTotalLength         :   0x22 (34 bytes)
   bNumInterfaces       :    0x1
   bConfigurationValue  :    0x1
   iConfiguration       :    0x0
   bmAttributes         :   0x80 Bus Powered
   bMaxPower            :   0x32 (100 mA)
    INTERFACE 0: Human Interface Device ====================
     bLength            :    0x9 (9 bytes)
     bDescriptorType    :    0x4 Interface
     bInterfaceNumber   :    0x0
     bAlternateSetting  :    0x0
     bNumEndpoints      :    0x1
     bInterfaceClass    :    0x3 Human Interface Device
     bInterfaceSubClass :    0x0
     bInterfaceProtocol :    0x0
     iInterface         :    0x0
      ENDPOINT 0x81: Interrupt IN ==========================
       bLength          :    0x7 (7 bytes)
       bDescriptorType  :    0x5 Endpoint
       bEndpointAddress :   0x81 IN
       bmAttributes     :    0x3 Interrupt
       wMaxPacketSize   :    0x8 (8 bytes)
       bInterval        :    0xa
print intf
    INTERFACE 0: Human Interface Device ====================
     bLength            :    0x9 (9 bytes)
     bDescriptorType    :    0x4 Interface
     bInterfaceNumber   :    0x0
     bAlternateSetting  :    0x0
     bNumEndpoints      :    0x1
     bInterfaceClass    :    0x3 Human Interface Device
     bInterfaceSubClass :    0x0
     bInterfaceProtocol :    0x0
     iInterface         :    0x0
      ENDPOINT 0x81: Interrupt IN ==========================
       bLength          :    0x7 (7 bytes)
       bDescriptorType  :    0x5 Endpoint
       bEndpointAddress :   0x81 IN
       bmAttributes     :    0x3 Interrupt
       wMaxPacketSize   :    0x8 (8 bytes)
       bInterval        :    0xa

Process finished with exit code 0

推荐答案

请勿使用PyUSB(除非您也需要其他协议).管理HID并不困难，但是有一个更简单的解决方案.

Don't use PyUSB (unless you need other protocols too). Managing HID isn't difficult, but there is a much easier solution.

HIDAPI是管理协议的C库，并且有也可以使用Python包装器.

此外，它隐藏了从操作系统夺回控制权的必要性，该操作系统可以识别连接时的HID协议，并安装自己的驱动程序.

Also, it hides the necessity to take control back from the operating system, which recognizes the HID protocol on connection, and install its own driver.

这篇关于使用PyUSB发送HID报告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！