GOODIX CONFIDENTIAL
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0xBB
：
Send mode, indicates the Transmit Buffer is flushed correctly.
0x 81A9
R
GT911_Status_Bak
：
GT911_Status backup
[0x81A8] GT911_Status
0x00
：
indicates GT911 will only perform touch detection, no HotKnot-relevant operations implemented.
0x88
：
When HotKnot proximity sensing function is enabled, the host sends command 0X20 to enable
GT911 to enter slave approach mode (works as receiving terminal). In this mode, hotkont proximity sensing
and touch detection alternate. When successfully detect the transmitting terminal, GT911 will report the
detection result to the host in coordinates (track id is 32). The host can issue command 0X28 to enable GT911
to exit slave approach mode.
0x99
：
When HotKnot proximity sensing function is enabled, the host sends command 0X21 to enable
GT911 to enter master approach mode. In this mode, hotkont proximity sensing and touch detection alternate.
When successfully detect the slave/receiving terminal, GT911 will report the detection result to the host in
coordinates (track id is 32). The host can issue command 0X29 to enable GT911 to exit master approach
mode.
0xAA
：
When GT911 successfully detect another hotknot-featured terminal, the host downloads and
sends the hotknot transmission firmware to GT911. When the firmware operates, GT911 enters Receive
mode by default. In this mode, GT911 will not implement any operation related to touch detection, and it
will keep detecting data from the transmitting terminal. Once a data frame is received, GT911 will notify the
host to process the data via INT.
0xBB
：
When GT911 successfully detect another hotknot-featured terminal, the host downloads and sends
the hotknot transmission firmware to GT911. When the firmware operates, GT911 enters Receive mode by
default. In this mode, when the Transmit Buffer is flushed correctly, GT911 switches to Send mode. When the
data in the Transmit Buffer is transmitted successfully, GT911 will notify the host to process the data via INT.
When data processing is completed, GT911 switches to Receive mode and perform Leave Detection, until the
Transmit Buffer is correctly flushed again.
When GT911 is implementing hotknot-related operations, the host can distinguish whether the
previously-issued command is transmitted successfully and whether resending is needed, or decide which
hotknot command to be sent by querying GT911_Status.
