MacBook Pro Monterey，使用 Arduino IDE 燒錄 ESP8266 會出現燒錄錯誤 “pyserial or esptool directories not found next to this upload.py tool.”

資料來源：https://www.tweaking4all.com/forum/arduino/macos-aruino-ide-how-to-fix-pyserial-or-esptool-directories-not-found-next-to-this-upload-py-tool-error-esp8266/

錯誤訊息如下：

pyserial or esptool directories not found next to this upload.py tool.
An error occurred while uploading the sketch

macOS版本：Monterey 12.3.1

ESP8266 Core version：2.6.3

aArduino IDE version：1.8.19

解決方法：

1. 打開這個檔案
   file~/Library/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/pyserial/serial/tools/list_ports_osx.py
   
2. 註釋掉這兩行

iokit = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')    
cf = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation')

加入這兩行：

iokit = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')
cf = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation')

修改完成後，程式碼應該像下面這樣子才對：

from serial.tools import list_ports_common

#iokit = ctypes.cdll.LoadLibrary(ctypes.util.find_library('IOKit'))
#cf = ctypes.cdll.LoadLibrary(ctypes.util.find_library('CoreFoundation'))
iokit = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/IOKit.framework/IOKit')
cf = ctypes.cdll.LoadLibrary('/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation')

kIOMasterPortDefault = ctypes.c_void_p.in_dll(iokit, "kIOMasterPortDefault")
kCFAllocatorDefault = ctypes.c_void_p.in_dll(cf, "kCFAllocatorDefault")

這樣就可以正常燒錄了！
Done！