ExternalVendorCode/openwifi
1
0
Fork 0
mirror of https://github.com/open-sdr/openwifi.git synced 2024-12-19 13:48:24 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Change the default bb_gain from 290 to 250 in tx_intf:

Browse Source 
- 2022-03-04 detailed test result:
- - bb_gain 290 work for 11a/g all mcs
- - bb_gain 290 work for 11n mcs 1~7 (aggr and non aggr)
- - bb_gain 290 destroy  11n mcs 0 long (MTU 1500) tx pkt due to high PAPR (Peak to Average Power Ratio)
- - bb_gain 250 work for 11n mcs 0
So, a conservative bb_gain 250 should be used
This commit is contained in:
Xianjun Jiao 2022-03-28 20:38:25 +02:00
parent 469b96d342
commit 0cbb687387
1 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
driver/tx_intf/tx_intf.c
View File

@ -317,7 +317,31 @@ static inline u32 hw_init(enum tx_intf_mode mode, u32 tx_config, u32 num_dma_sym
tx_intf_api->TX_INTF_REG_TX_HOLD_THRESHOLD_write(420);
tx_intf_api->TX_INTF_REG_INTERRUPT_SEL_write(0x4); //.src_sel(slv_reg14[2:0]), 0-s00_axis_tlast,1-ap_start,2-tx_start_from_acc,3-tx_end_from_acc,4-tx_try_complete from xpu
tx_intf_api->TX_INTF_REG_INTERRUPT_SEL_write(0x30004); //disable interrupt
tx_intf_api->TX_INTF_REG_BB_GAIN_write(100);
// tx_intf_api->TX_INTF_REG_BB_GAIN_write(100); // value for old design with DUC (FIR + MIXER) -- obsolete due to DUC removal
// New test on new design (unified RF BB clock; No DUC)
// 5220MHz bb_gain power EVM
// 400 -6dBm -34/35
// 350 -7.2dBm -34/35/36
// 300 -8.5dBm -35/36/37 EVM
// 2437MHz bb_gain power EVM
// 400 -3.2dBm -36/37
// 350 -4.4dBm -37/38/39
// 300 -5.7dBm -39/40
// less less -40/41/42!
// According to above and more detailed test:
// Need to be 290. Otherwise some ofdm symbol's EVM jump high, when there are lots of ofdm symbols in one WiFi packet
// 2022-03-04 detailed test result:
// bb_gain 290 work for 11a/g all mcs
// bb_gain 290 work for 11n mcs 1~7 (aggr and non aggr)
// bb_gain 290 destroy 11n mcs 0 long (MTU 1500) tx pkt due to high PAPR (Peak to Average Power Ratio)!
// bb_gain 250 work for 11n mcs 0
// So, a conservative bb_gain 250 should be used
tx_intf_api->TX_INTF_REG_BB_GAIN_write(250);
tx_intf_api->TX_INTF_REG_ANT_SEL_write(ant_sel);
tx_intf_api->TX_INTF_REG_WIFI_TX_MODE_write((1<<3)|(2<<4));
tx_intf_api->TX_INTF_REG_MULTI_RST_write(0x434);