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RTL8822CE RTL8822CU RTL8822CS COB TSSI MP FLOW

4.3.2. Calibration Tx flatness K

Let's correct the flatness of the channel. The step by step commands are in the below.

Step 1 : Begin 2DH5 packet TX in channel 12/32/52/70

If Channel 12 :

bt_mp_SetParam 1,0x0B;2,0x06;3,0x07;4,0x00;6,0x7F;7,0x0;11,0x0000009e8b33

If Channel 20 :

bt_mp_SetParam 1,0x20;2,0x06;3,0x07;4,0x00;6,0x7F;7,0x0;11,0x0000009e8b33

If Channle 52 :

bt_mp_SetParam 1,0x34;2,0x06;3,0x07;4,0x00;6,0x7F;7,0x0;11,0x0000009e8b33

If Channel 70 :

bt_mp_SetParam 1,0x46;2,0x06;3,0x07;4,0x00;6,0x7F;7,0x0;11,0x0000009e8b33

bt_mp_Exec 30

Step 2 : measured by Bluetooth test instrument (e.g. Litepoint IQNxN).

Step 3 : Stop Packet Tx (FW_PACKET_TX_STOP=31),

then repeat to 4 channels to complete the measurement

bt_mp_Exec 31

Step 4 : Calculate flatness value and keep the flatnessK value.

flatnessK value [0~3 ] =floor((Txpower_flat_target- Txpower_flat_measure[0~3])*2)

Step 5 : Write to efuse of device .( This action can be placed after the final verification)

This tx flatness k is a signed value, please refer to section “7.3.Tx flatness K mapping table”.