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WL1805MOD: WL1805 use？

Simba Su
Prodigy 240 points
Part Number: WL1805MOD

1. At present, the model used on the gateway is WL1805, and the main control of the gateway is STM32MP1, which actually uses 2.4GHz. In close range test, WL1805 is used as STA, AP or router and gateway are in the same position, and the delay of gateway to ping AP is about 10-20ms.Is it normal?

2. How to use WL1805 in MIMO dual antenna mode at 2.4GHz? Is the driver a default match or need to be configured?Does the MIMO dual antenna mode improve latency and throughput?At present, in the actual test, the signal strength can be seen by whether the antenna is connected or not, and it can be judged that the antenna connected to AN2 does not work. If the antenna is only connected to AN2, the wireless signal strength is very weak, which is similar to the effect of no antenna connected

3. When the AP is adjusted about 5 meters away from the gateway, through "IW Dev Wlan0 Link", you can see that the TX bitrate is not very stable and will fluctuate, such as 10-54. Mbit /s

4. Are there any other instructions or methods that can be tested?Can I also switch to debug mode on my own WL1805 and use the "WLAN Implementation Tuning Tool (RTTT)"?

Thank you very much!

  • 0
    TI__Genius 10550 points

    Hi, 

    Please find my input below 

    Simba Su said:
    1. At present, the model used on the gateway is WL1805, and the main control of the gateway is STM32MP1, which actually uses 2.4GHz. In close range test, WL1805 is used as STA, AP or router and gateway are in the same position, and the delay of gateway to ping AP is about 10-20ms.Is it normal?

    The delay could be because of the power save mode used. By default the power save mode is enabled in STA mode and it is expected to see such delays. You can refer to another related thread on the same https://e2e.ti.com/support/wireless-connectivity/wifi/f/wi-fi-forum/984486/wl1837mod-power_save-affect-on-ping-latency/3643488#3643488

    Simba Su said:
    2. How to use WL1805 in MIMO dual antenna mode at 2.4GHz? Is the driver a default match or need to be configured?Does the MIMO dual antenna mode improve latency and throughput?At present, in the actual test, the signal strength can be seen by whether the antenna is connected or not, and it can be judged that the antenna connected to AN2 does not work. If the antenna is only connected to AN2, the wireless signal strength is very weak, which is similar to the effect of no antenna connected

    You can refer to wlconf guide at https://www.ti.com/lit/an/swra489/swra489.pdf?ts=1618261826644&ref_url=https%253A%252F%252Fwww.google.com%252F. Please verify that the device has two antennas and MIMO is enabled as detailed below. SISO 40 is default mode. The details of configuring the ht_mode is also contained in the same document. 

    • Mapping of ht_mode:

    MIMO: use wl18xx.ht.mode=0

    SISO40: use wl18xx.ht.mode=1 (default)

    SISO20: use wl18xx.ht.mode=2

    Simba Su said:
    3. When the AP is adjusted about 5 meters away from the gateway, through "IW Dev Wlan0 Link", you can see that the TX bitrate is not very stable and will fluctuate, such as 10-54. Mbit /s

    To measure the throughput best is to use iperf command and generate a known traffic and check for the data rate. 

    Simba Su said:
    4. Are there any other instructions or methods that can be tested?Can I also switch to debug mode on my own WL1805 and use the "WLAN Implementation Tuning Tool (RTTT)"?

    RTTT is mainly used for RF testing. iPerf is preferred tool to check for throughput. You can find more details on iPerf online (https://onl.wustl.edu/Tutorial/Filters,_Queues_and_Bandwidth/Generating_Traffic_With_Iperf.html). Hope this helps. 

    Regards, 

    Sudharshan K N