Product Info

RTL8822CE RTL8822CU RTL8822CS COB TSSI MP FLOW
©2019 Realtek Semiconductor Corp.
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4.3.1. Calibration Tx gain K
Here demonstrate the flow about calibrating Tx power to target power. We supposed to use
desired target power as calibration power in this step. This Tx gain K is a signed value.
Tx gain K value
value
12
0x0C
…
…
4
0x04
3
0x03
2
0x02
1
0x01
0
0 (Default)
-1
0xFF
-2
0xFE
-3
0xFD
-4
0xFC
…
…
-12
0xF4
Table 12: Tx gain K mapping table
Step 1 : Begin 2DH5 packet Tx in channel “0x27”.
bt_mp_SetParam 1,0x27;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)
Txpower_measure is measured value.
Step 3 : Calculate Tx Gain K value and keep the TxgainK.
TxgainK = round((Txpower_target – Txpower_measure)/ 0.5)
Example : Txpower_target = 6 dBm
Step 4 : Stop Packet Tx (FW_PACKET_TX_STOP=31)
bt_mp_Exec 31
Keep the Tx gain k value write to device in last work.