Back Channel data | Cypress Semiconductor
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Back Channel data
How does the device trigger Back channel data?
Agile HID Protocol version 2.1 adds a new back channel support function. It allows the dongle to send information back to the device. The device sends a back channel request to the dongle and then waits for an ACK packet. When it receives the ACK packet, the device switches to receive mode to receive data from the dongle. The following data packet tells about the bit position for the Back channel packet.