how yo use AOA mode 1us,in RX,it is set 2us AOA,how to change it?

Question

i use the zephyr 3.0.9.i use direction with nrf52833 or nrf5340 in RX.The tx is nrf52833 with nrf of NCS,ITversion is zephyr 2.7.9.The default is 2us AOA. I want to use 1us,i change the configurarion in main.c.The xlot_durations is 0x2,i change iit,make it as 0x1. 
 #if defined(CONFIG_BT_DF_CTE_RX_AOA)
 .cte_types = BT_DF_CTE_TYPE_ALL,
 .slot_durations = 0x1,
 .num_ant_ids = ARRAY_SIZE(ant_patterns),
 .ant_ids = ant_patterns,
#else
 .cte_types = BT_DF_CTE_TYPE_AOD_1US | BT_DF_CTE_TYPE_AOD_2US,
#endif /* CONFIG_BT_DF_CTE_RX_AOA */ 
 but it is 2us mode. it is strange.this is my putty output. 
 PER_ADV_SYNC[0]: [DEVICE]: 3C:D0:89:51:58:90 (random), tx_power 127, RSSI -67, CTE AOA, data length 0, data:

CTE[0]: samples count 45, cte type AOA, slot durations: 2 [us], packet status CRC OK, RSSI -670

IQ sample content :

sample[0] = I:-2 Q:1

sample[1] = I:3 Q:-3

sample[2] = I:-4 Q:1

sample[3] = I:2 Q:-3

sample[4] = I:-4 Q:2

sample[5] = I:3 Q:-1

sample[6] = I:-4 Q:1

sample[7] = I:2 Q:-5

sample[8] = I:4 Q:3

sample[9] = I:-4 Q:-5

sample[10] = I:0 Q:-6

sample[11] = I:2 Q:-4

sample[12] = I:2 Q:3

sample[13] = I:1 Q:0

sample[14] = I:0 Q:-1

sample[15] = I:0 Q:0

sample[16] = I:0 Q:1

sample[17] = I:3 Q:4

sample[18] = I:3 Q:0

sample[19] = I:0 Q:-4

sample[20] = I:-4 Q:5

sample[21] = I:-6 Q:2

sample[22] = I:-3 Q:-3

sample[23] = I:1 Q:-5

sample[24] = I:-1 Q:-2

sample[25] = I:2 Q:0

sample[26] = I:0 Q:-1

sample[27] = I:1 Q:-1

sample[28] = I:6 Q:-6

sample[29] = I:0 Q:-2

sample[30] = I:-6 Q:0

sample[31] = I:5 Q:1

sample[32] = I:4 Q:5

sample[33] = I:-1 Q:4

sample[34] = I:-5 Q:-1

sample[35] = I:-2 Q:0

sample[36] = I:0 Q:0

sample[37] = I:-1 Q:-1

sample[38] = I:-1 Q:-1

sample[39] = I:-5 Q:-5

sample[40] = I:-3 Q:1

sample[41] = I:0 Q:5

sample[42] = I:0 Q:-6

sample[43] = I:3 Q:-5

sample[44] = I:3 Q:0
 
 can you help me?