Windows上用 Python 脚本控制 CP2104 GPIO 输出

晕哥 · 2019-03-02 09:57:49

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

晕哥 · 2019-03-02 10:00:50

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)

用 zadig 给cp2104 强制装上 libusb-win32 驱动程序
运行D:\Python\Python37\python.exe cp2104.py

晕哥 · 2019-03-02 10:54:05

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

晕哥 · 2019-03-02 10:55:51

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)

九重天 · 2020-10-09 21:09:20

感谢楼主, 测试py+cp2104测试成功.

WhyCan Forum(哇酷开发者社区)

楼主 #1 2019-03-02 09:57:49 分享评论

Windows上用 Python 脚本控制 CP2104 GPIO 输出

楼主 #2 2019-03-02 10:00:50 分享评论

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

楼主 #3 2019-03-02 10:54:05 分享评论

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

楼主 #4 2019-03-02 10:55:51 分享评论

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

#5 2020-10-09 21:09:20 分享评论

Re: Windows上用 Python 脚本控制 CP2104 GPIO 输出

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