问题表现为，在某些 Windows 系统下，树莓派 Pico 的存储可以被系统识别，但打开 Thonny 时，却看不到 Pico 的串口端口号。在系统的设备管理中，串口设备无法识别，显示如下图：

解决办法如下：
新建文本文件，添加如下代码文件，保存文件名为「Board CDC_RP2_pico-serial」，文件格式为 inf，这个文件格式就是驱动文件。然后在设备管理器中，手动添加这个驱动程序给无法识别设备。

; Windows 2000, XP, Vista, 7 and 8 (x32 and x64) setup file for Atmel CDC Devices
; Copyright (c) 2000-2013 ATMEL, Inc.

[Version]
Signature   = "$Windows NT$"
Class       = Ports
ClassGuid   = {4D36E978-E325-11CE-BFC1-08002BE10318}

Provider    = %Manufacturer%
LayoutFile  = layout.inf
CatalogFile = atmel_devices_cdc.cat
DriverVer   = 01/08/2013,6.0.0.0

;----------------------------------------------------------
; Targets
;----------------------------------------------------------
[Manufacturer]
%Manufacturer%=DeviceList, NTAMD64, NTIA64, NT

[DeviceList]
%PI_CDC_PICO%=DriverInstall, USBVID_2E8A&PID_0005&MI_00

[DeviceList.NTAMD64]
%PI_CDC_PICO%=DriverInstall, USBVID_2E8A&PID_0005&MI_00

[DeviceList.NTIA64]
%PI_CDC_PICO%=DriverInstall, USBVID_2E8A&PID_0005&MI_00

[DeviceList.NT]
%PI_CDC_PICO%=DriverInstall, USBVID_2E8A&PID_0005&MI_00

;----------------------------------------------------------
; Windows 2000, XP, Vista, Windows 7, Windows 8 - 32bit
;----------------------------------------------------------
[Reader_Install.NTx86]


[DestinationDirs]
DefaultDestDir=12
DriverInstall.NT.Copy=12

[DriverInstall.NT]
include=mdmcpq.inf
CopyFiles=DriverInstall.NT.Copy
AddReg=DriverInstall.NT.AddReg

[DriverInstall.NT.Copy]
usbser.sys

[DriverInstall.NT.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,usbser.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"

[DriverInstall.NT.Services]
AddService = usbser, 0x00000002, DriverService.NT

[DriverService.NT]
DisplayName = %Serial.SvcDesc%
ServiceType = 1 ; SERVICE_KERNEL_DRIVER
StartType = 3 ; SERVICE_DEMAND_START
ErrorControl = 1 ; SERVICE_ERROR_NORMAL
ServiceBinary = %12%usbser.sys
LoadOrderGroup = Base

;----------------------------------------------------------
; Windows XP, Vista, Windows 7, Windows 8 - 64bit
;----------------------------------------------------------

[DriverInstall.NTamd64]
include=mdmcpq.inf
CopyFiles=DriverCopyFiles.NTamd64
AddReg=DriverInstall.NTamd64.AddReg

[DriverCopyFiles.NTamd64]
usbser.sys,,,0x20

[DriverInstall.NTamd64.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,usbser.sys
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"

[DriverInstall.NTamd64.Services]
AddService=usbser, 0x00000002, DriverService.NTamd64

[DriverService.NTamd64]
DisplayName=%Serial.SvcDesc%
ServiceType=1
StartType=3
ErrorControl=1
ServiceBinary=%12%usbser.sys

;----------------------------------------------------------
; String
;----------------------------------------------------------

[Strings]
Manufacturer = "ATMEL, Inc."
PI_CDC_PICO = "Pi Pico Serial Port"

Serial.SvcDesc = "Pi Pico Serial Driver"

驱动程序更新正常后如下图所示：

https://www.cnblogs.com/ccfwz/p/14862076.html

标签： 树莓派 Pico问题排查Raspberry Pi