CYW954907AEVAL1F WIFI parameters IPERF

[ecbg]

Hello, 

I try to understand the different command below and the mcs_data_rate_lookup_table.

The iperf example is used to validate the modifications of the parameters in measuring the datarate.

The goal is to understanding how to select the type of modulation (BPSK, 64 QAM, 128QAM) the number of wifi channel  (20MHz, 40MHz, 80MHz).

The iperf program has been modified as below:

/* Bring up the network on the STA interface */
wwd_wifi_set_tx_power( 0 );
wwd_wifi_set_mcs_rate( WICED_STA_INTERFACE, 0, 0 );
wwd_wifi_set_bandwidth(80);
wiced_network_up( WICED_STA_INTERFACE, WICED_USE_EXTERNAL_DHCP_SERVER, NULL );
//wwd_wifi_set_preferred_association_band( WLC_BAND_2G );
bandwidth = wwd_wifi_get_bandwidth() ;
printf("Bandwidth: %lu \n", bandwidth);

result = wwd_wifi_get_ht_mode ( WICED_STA_INTERFACE, &test);
printf("htmode: %d \n", result);
printf( "iPerf app\n" );

/* Add iperf command to console */
command_console_init( STDIO_UART, MAX_LINE_LENGTH, line_buffer, MAX_HISTORY_LENGTH, history_buffer_storage, " " );
console_add_cmd_table( iperf_commands );

Two board are used one in AP, the other in STA. A loink is created between the two board in order to test the datarate.

No modification brings a change on the datarate value.

Does anyone have an operating example?

Thank's

[GauravS_31]

To actually set the bandwidth in the Wi-Fi chip, you can call wwd_wifi_set_bandwidth(BANDWIDTH_80MHZ) for 80MHz bandwidth. This will set the global variable bandwidth=BANDWIDTH_80MHZ. This should be followed by calling wwd_wifi_set_chanspec(). You can see an implementation of this function in internal_ap_init() in WICED/WWD/internal/chips/4390x/wwd_ap.c. Regarding modulation setting, we will check and get back to you.

[ecbg]

Hello I tried the above function.

For success compilation, I put the function wwd_wifi_set_bandwidth and  wwd_wifi_set_chanspec after the function wiced_network_up. Is it ok?

But no change about the datarate with iperf.

You can show below my code, is it correct?

wiced_network_up( WICED_STA_INTERFACE, WICED_USE_EXTERNAL_DHCP_SERVER, NULL );
wwd_wifi_set_bandwidth(BANDWIDTH_80MHZ);
wwd_wifi_set_chanspec(WICED_STA_INTERFACE,32,sem_change_spec);

Best regards

[ecbg]

static host_semaphore_type_t* sem_change_spec;

[Rakesh_BG · Accepted solution]

Hi @ecbg ,

The steps what you followed is correct but you have to choose the valid channel and bandwidth combination(may be 40/80 in your case). The list of valid channel-bandwidth which CYW954907AEVAL1F supports is given below.

chanspecs
1 (0x1001)
2 (0x1002)
3 (0x1003)
4 (0x1004)
5 (0x1005)
6 (0x1006)
7 (0x1007)
8 (0x1008)
9 (0x1009)
10 (0x100a)
11 (0x100b)
5u (0x1903)
6u (0x1904)
7u (0x1905)
8u (0x1906)
9u (0x1907)
10u (0x1908)
11u (0x1909)
1l (0x1803)
2l (0x1804)
3l (0x1805)
4l (0x1806)
5l (0x1807)
6l (0x1808)
7l (0x1809)
36 (0xd024)
40 (0xd028)
44 (0xd02c)
48 (0xd030)
52 (0xd034)
56 (0xd038)
60 (0xd03c)
64 (0xd040)
100 (0xd064)
104 (0xd068)
108 (0xd06c)
112 (0xd070)
116 (0xd074)
120 (0xd078)
124 (0xd07c)
128 (0xd080)
132 (0xd084)
136 (0xd088)
140 (0xd08c)
144 (0xd090)
149 (0xd095)
153 (0xd099)
157 (0xd09d)
161 (0xd0a1)
165 (0xd0a5)
40u (0xd926)
48u (0xd92e)
56u (0xd936)
64u (0xd93e)
104u (0xd966)
112u (0xd96e)
120u (0xd976)
128u (0xd97e)
136u (0xd986)
144u (0xd98e)
153u (0xd997)
161u (0xd99f)
36l (0xd826)
44l (0xd82e)
52l (0xd836)
60l (0xd83e)
100l (0xd866)
108l (0xd86e)
116l (0xd876)
124l (0xd87e)
132l (0xd886)
140l (0xd88e)
149l (0xd897)
157l (0xd89f)
36/80 (0xe02a)
52/80 (0xe03a)
100/80 (0xe06a)
116/80 (0xe07a)
132/80 (0xe08a)
149/80 (0xe09b)
40/80 (0xe12a)
56/80 (0xe13a)
104/80 (0xe16a)
120/80 (0xe17a)
136/80 (0xe18a)
153/80 (0xe19b)
44/80 (0xe22a)
60/80 (0xe23a)
108/80 (0xe26a)
124/80 (0xe27a)
140/80 (0xe28a)
157/80 (0xe29b)
48/80 (0xe32a)
64/80 (0xe33a)
112/80 (0xe36a)
128/80 (0xe37a)
144/80 (0xe38a)
161/80 (0xe39b)

For selecting different modulation techniques available . The list of mcs rate value given below

2g rate - a simple CCK/DSSS/OFDM rate value {1 2 5.5 11 6 9 12 18 24 36 48 54}

5g rate - a simple OFDM rate value {6 9 12 18 24 36 48 54} 

Thanks,

Rakesh B G

[ecbg]

Hello Rakesh,

I tried your table.Trying some channels:

With a spectrum analyser, the used channel is verify during the iperf test.  The two following function do not change the channel.
wwd_wifi_set_bandwidth(BANDWIDTH_80MHZ);
wwd_wifi_set_chanspec(WICED_STA_INTERFACE,32,sem_change_spec);

An other  function  result_set_channel = wwd_wifi_set_channel(WWD_AP_INTERFACE,9)  give positive results, It has been verified with a spectrum analyzer for channel 1 to 10 and it is correlated with the regulation (see below).

Channel	F0 (MHz)	Frequency range (MHz)	North America[3]	Japan [3]	India [4]	Most of world [3][5][6][7] [8][9][10][11]
1	2412	2401–2423	Yes	Yes	Yes	Yes
2	2417	2406–2428	Yes	Yes	Yes	Yes
3	2422	2411–2433	Yes	Yes	Yes	Yes
4	2427	2416–2438	Yes	Yes	Yes	Yes
5	2432	2421–2443	Yes	Yes	Yes	Yes
6	2437	2426–2448	Yes	Yes	Yes	Yes
7	2442	2431–2453	Yes	Yes	Yes	Yes
8	2447	2436–2458	Yes	Yes	Yes	Yes
9	2452	2441–2463	Yes	Yes	Yes	Yes
10	2457	2446–2468	Yes	Yes	Yes	Yes
11	2462	2451–2473	Yes	Yes	Yes	Yes
12	2467	2456–2478	NoB	Yes	Yes	Yes
13	2472	2461–2483	NoB	Yes	Yes	Yes
14	2484	2473–2495	No	11b onlyC	No	No

But For channel in 5GHz band, it is not possible to have a  "joined wifi access" with success.
So The following test bench has been set:
One board is program with the snip scan example, the second board is program with our iperf program in mode AP.
For channel 1 to 10, scan program detect The AP board in the right channel (channelm in the 2.4GHz band).
For channel 36, 40, 44, and 48 (5GHz band), scan program  detect  the AP board with the right channel but no way to have a "joined wifi access" with success.
Channel 52 and 32 give error.

So do you have an idea of what it can missing between the 2.4GHz mode and the 5GHz mode? Same program is used, only wwd_wifi_set_channel(WWD_AP_INTERFACE,9)  is modify. 
wwd_wifi_set_preferred_association_band( WLC_BAND_5G ); has been tested without success.

Do you have an example of operating iperf (AP+STA) in the 5GHz band? Or any success connection in the 5GHz band with a baord programed in AP mode and the other in STA mode?

Thank's for your help.

Best regards