Asus AAEON UP Xtreme UP-WHL01 - Page 78

CEC Client Installation 23
CEC Client Installation Supplemental Appendix for UP Xtreme
STM32 device should be detected on USB host as a USB CDC serial device. Each of the
API functions and input/output arguments should be serialized in the following way:
● Sending a cec command is executed by sending a string in the following format
via CDC:
send <address> <hex-string>
● If the command is sent successfully, the string ACK will be returned via CDC
● Received messages will be dislayed as:
CEC: <hex-string>
● In case of error, string will be received in format:
ERR: <error-code>
All messages end with <CR> <LF> characters.
Error messages are generally received if the message was unable to be delivered on
device, or if the message was sent in the wrong format.
Example:
Getting CEC version from the TV:
Terminal
Description
> send 0 9F
Send CEC get version command to address 0
ACK
The command was successfully sent
CEC: 019E05
Received from 0 to device 1: cec version 1.4
Getting power status from device 2 that is not present on the CEC network:
Terminal
Description
> send 2 8F
Send CEC get power status to address 2
ERR: 0x00001000
Sending failed: acknowledgement is not received