steval-wbc86tx proprietary code

[Nihal0512]

Hi,

 

I am using a STEVAL-WBC86TX Wireless Qi transmitter. I am going through a code and couldn't figure it out what is the meaning of the code(proprietary packet) received by the transmitter. Can any one help me to understand the meaning of this code.

 

[Didier HERROUIN]

Dear Nihal0512,

The packet you are showing (03 03 F7 F4) is not a proprietary packet, but a standard Qi packet.

In this case, it is a Control Error Packet sent by the receiver to regulate the level of transmitted power. 

The Control Error Value (F4) is a two’s complement signed integer value that is a relative measure for the deviation
between the actual and target operating points of the Power Receiver. It is usually updated every 250ms.