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CC2564C: AVPR bad packet, LMP_power_control_req config threshold

Part Number: CC2564C
Other Parts Discussed in Thread: CC2564

Hi to all

I use cc2564c for HFP audio application (custom hardware design and modified version of HFPDemo_HF, patch v1.5, Bluetopia 4.2.1.1, ARM cortexM)

audio quality is good (not perfect) for near range (< 1meter) but after moving remote device (smart phone) to more far range, RRSI decreased and AVPR report bad packet (~5%) and audio distorted.

in some case (sharp RSSI decrease) CC2564 send LMP_power_control_req to phone and request increase power but when RSSI decrees slowly cc2564 don't send LMP_power_control_req when RSSI lower than golden range.

cc2564 respond to LMP request from remote device correctly but don't send request properly 

at first step, I try to use LMP power control to get maximum power of remote device (smart phone)

according to datasheet, cc2564c's minimum sensitivity is about -90dbm can you please help me resolve bad packet, especially on low RSSI 

Logger file attached.

7838.LMP_Power_test_2.rar

Thanks