В
даташите CP2103 сказано:
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7. GPIO Pins
The CP2103 supports (4) user-configurable GPIO pins for status and control information. More information
regarding the configuration and usage of these pins can be found in “AN144: CP210x Customization Guide” and
“AN223: Port Configuration and GPIO for CP210x” available on the Silicon Laboratories website.
Смотрите там.
Но там же и вот такое ... сильно настораживающее предупреждение:
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10. USBXpress™ Direct Driver Support
The Silicon Laboratories USBXpress™ for CP210x Development Kit provides an alternate solution for interfacing
with CP2103 devices than using the Virtual COM port. No Serial Port protocol expertise is required. Instead, a
simple, high-level application program interface (API) is used to provide simpler CP2103 connectivity and
functionality.
The USBXpress for CP210x Development Kit includes Windows device drivers, Windows device driver installer
and uninstallers, and a host interface function library (host API) provided in the form of a Windows Dynamic Link
Library (DLL). The included device drivers and installation files support MS Windows 98SE/2000/XP.