[SAMR21 new gameplay] 34. Simulate USB mouse and keyboard

dcexpert

[SAMR21 new gameplay] 34. Simulate USB mouse and keyboard [Copy link]

 

 

Like MicroPython, CircuitPython can easily simulate USB HID devices, and can use the device as a USB keyboard or USB mouse. Let's take a look at the basic usage of USB HID:

import usb_hid

kb = usb_hid.devices[0]
kb.send_report(buf)

buf is bytes or bytearray type. For keyboard, 8 bytes of data need to be sent, and for mouse, 4 bytes of data need to be sent. This content is originally created by dcexpert

, a user of EEWORLD forum. If you want to reprint or use it for commercial purposes, you need to obtain the author's consent and indicate the source

dcexpert

The above is just the basic usage. The specific usage is as follows: How to use the USB keyboard:

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First, define the keyboard class kb, and then send data to represent the key press. Note that after sending the data, you need to send 0 again to represent the key release, otherwise the system will continue to send key presses. For example, the following will send the letter a:

kb_send(4)

dcexpert

Because the keyboard buffer is 8 bytes, the first byte represents the status of the ctrl, shift, alt keys, and bytes 2-7 represent characters, so a maximum of 6 characters can be sent at a time. By slightly modifying the above program, you can send multiple characters:

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For example, using kb_sends(4,5,6) will send abc.

dcexpert

Note that the keyboard data sent by USB HID is not the ASCII code of the character, but the data defined by the USB protocol. For specific data, please refer to the provisions of the USB protocol, or refer to the simplified table below.

USBKeyScan.pdf (16.4 KB, downloads: 30)

2019-10-18 10:52 上传

点击文件名下载附件

dcexpert

The use of the mouse is similar to that of the keyboard, except that device[1] is used and the data is 4 bytes:

mouse = usb_hid.devices[1]
mouse.send_report(bytes([0, 100, 0, 0]))

The above program moves the mouse position 100 to the right (in the x direction).

The data in the buffer, the first byte represents the mouse button; the second/third byte represents the movement distance in the X/Y direction; the fourth byte represents scrolling.

dcexpert

USB mouse and keyboard demonstration, when you press the touch key A0, the mouse moves in a circle; press A1 to send the number 1; press A2 to send the letter a.

import usb_hid
from time import sleep
import touchio
from board import *
import math

tp1 = touchio.TouchIn(A0)
tp2 = touchio.TouchIn(A1)
tp3 = touchio.TouchIn(A2)

kb = usb_hid.devices[0]
mouse = usb_hid.devices[1]

n = 0
while 1:
    sleep(0.1)
    if tp1.value:
        t = n*math.pi/360
        x, y = round(10*math.cos(t)), round(10*math.sin(t))
        if x < 0: x += 256
        if y < 0: y += 256
        buf = bytes([0, x, y, 0])
        print(n, buf[0], buf[1] ,buf[2], buf[3])
        mouse.send_report(buf)
        n += 10

    if tp2.value:
        kb.send_report(bytes([0, 0, 0x1E, 0, 0, 0, 0, 0]))
        sleep(0.01)
        kb.send_report(bytes(8))
        kb.send_report(bytes(8))
    
    if tp3.value:
        kb.send_report(bytes([0, 0, 0x04, 0, 0, 0, 0, 0]))
        sleep(0.01)
        kb.send_report(bytes(8))
        kb.send_report(bytes(8))

430600020

SAMR21 New Gameplay] 34. Simulate USB Mouse and Keyboard [ Modify ]

feiandrou

Hello, is usb-hib built into the device? I want to use python to call it, but it keeps reporting No module named 'usb_hid'.

dcexpert

feiandrou posted on 2019-12-18 22:01 Hello, is usb-hib built into the device? I want to use python to call it now, but I keep getting "No module named 'usb_hi ...

It comes with the software. Is it your version problem?

9zhmke

dcexpert posted on 2019-12-19 09:02 It comes with it. Is it your version problem?

Can 8266 or ESP32 also play this?

dcexpert

9zhmke posted on 2019-12-24 10:02 Can 8266 or ESP32 also play this?

cannot

chening

See how to use it

soidea

Which development board can run the above code?

dcexpert

soidea posted on 2020-11-27 14:31 Which development board can run the above code?

Anything that supports CircuitPython is fine, such as SAM D21/R21/D51, etc.

hwsh

Thank you for sharing the technique.

小Z学一学

RE: [SAMR21 New Gameplay] 34. Simulate USB Mouse and Keyboard [ Modify ]

小Z学一学

RE: [SAMR21 New Gameplay] 34. Simulate USB Mouse and Keyboard [ Modify ]

小Z学一学

• RE: [SAMR21 New Gameplay] 34. Simulate USB Mouse and Keyboard [ Modify ]

小Z学一学

RE: [SAMR21 New Gameplay] 34. Simulate USB Mouse and Keyboard [ Modify ]

小Z学一学

SAMR21 New Gameplay] 34. Simulate USB Mouse and Keyboard [ Modify ]