CH375 through the USB interface chip analog HID class USB keyboard, external firmware mode by CH375, the biggest feature is the need to install drivers, plug and play, and can transmit data continuously, you can view the text in the txt. I upload the data to improve the function of making this change the value of the parameter to pass the direct control of PPT.

USB_HID_CH375\CH375_HID.C
.............\CH375INC.H
.............\HID_Keyboard.plg
.............\HID_Keyboard.uvproj
.............\HID_Keyboard.hex
.............\HID_Keyboard.lnp
.............\HID_Keyboard.M51
.............\HID_Keyboard_uvopt.bak
.............\HID_Keyboard_uvproj.bak
.............\STARTUP.A51
.............\STARTUP.LST
.............\STARTUP.OBJ
.............\CH375_HID.LST
.............\CH375_HID.OBJ
.............\HID_Keyboard
.............\HID_Keyboard.uvopt
.............\USB_HID_CH375.rar
USB_HID_CH375

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