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晕哥

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注册时间： 2017-09-06

已发帖子： 9,348

积分： 9202

Windows上用 Python 脚本控制 CP2104 GPIO 输出

参考链接: https://www.silabs.com/community/interface/knowledge-base.entry.html/2018/07/24/how_to_control_gpios-Wot7

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晕哥

管理员

注册时间： 2017-09-06

已发帖子： 9,348

积分： 9202

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

import time
import usb.core
import usb.util

PID = 0xea60
VID = 0x10c4

dev = usb.core.find(idVendor=VID, idProduct=PID)
if not dev:
        print("CP2104 was not found :(")
        exit(1)
print("Yeeha! Found CP2104")

reqType = 0x41
bReq = 0xFF
wVal = 0x37E1

while True:

        wIndex = 0xffff
        print("toggling On")
        dev.ctrl_transfer(reqType, bReq, wVal, wIndex, [])
        time.sleep(5)
        print("toggling Off")
        wIndex = 0x00ff
        dev.ctrl_transfer(reqType, bReq, wVal, wIndex, [])
        time.sleep(5)

1. 用 zadig 给cp2104 强制装上 libusb-win32 驱动程序

2. 运行D:\Python\Python37\python.exe cp2104.py

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taobao： V3s/F1C100s/F1C200s/D1-H/D1s/T113-S3/XR32/XR829/A523/A133/H133/V831/V851s/V853

晕哥

管理员

注册时间： 2017-09-06

已发帖子： 9,348

积分： 9202

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

debugdump@ubuntu:~$ sudo python3 /mnt/hgfs/D/cp2104.py
Yeeha! Found CP2104
toggling On
Traceback (most recent call last):
  File "/mnt/hgfs/D/cp2104.py", line 22, in <module>
    dev.ctrl_transfer(reqType, bReq, wVal, wIndex, [])
  File "/usr/local/lib/python3.4/dist-packages/usb/core.py", line 1043, in ctrl_transfer
    self.__get_timeout(timeout))
  File "/usr/local/lib/python3.4/dist-packages/usb/backend/libusb1.py", line 883, in ctrl_transfer
    timeout))
  File "/usr/local/lib/python3.4/dist-packages/usb/backend/libusb1.py", line 595, in _check
    raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 110] Operation timed out

在Ubuntu Linux 下跑会出现一个超时错误: [Errno 110] Operation timed out

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taobao： V3s/F1C100s/F1C200s/D1-H/D1s/T113-S3/XR32/XR829/A523/A133/H133/V831/V851s/V853

晕哥

管理员

注册时间： 2017-09-06

已发帖子： 9,348

积分： 9202

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

https://stackoverflow.com/questions/38658907/trouble-using-pyusb-to-read-write-from-usb-device-timeouts

解决方案: 在 find() 后加 reset()

import time
import usb.core
import usb.util

PID = 0xea60
VID = 0x10c4

dev = usb.core.find(idVendor=VID, idProduct=PID)

dev.reset()

if not dev:
        print("CP2104 was not found ")
        exit(1)
print("Yeeha! Found CP2104")

reqType = 0x41
bReq = 0xFF
wVal = 0x37E1

while True:

        wIndex = 0xffff
        print("toggling On")
        dev.ctrl_transfer(reqType, bReq, wVal, wIndex, [])
        time.sleep(5)
        print("toggling Off")
        wIndex = 0x00ff
        dev.ctrl_transfer(reqType, bReq, wVal, wIndex, [])
        time.sleep(5)

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taobao： V3s/F1C100s/F1C200s/D1-H/D1s/T113-S3/XR32/XR829/A523/A133/H133/V831/V851s/V853