WIFI Shield DMA support

Discussion related to "under the hood" OpenMV topics.
sockbr
Posts: 1
Joined: Mon May 18, 2020 10:06 am
Location: Switzerland

WIFI Shield DMA support

Postby sockbr » Mon May 18, 2020 10:27 am

Hello All,

I just started to use the OpenMV H7 plus with the WIFI shield and I noticed that the throughput is lower (~5 Mbits/s) than what it could be expected for the WLAN IC.
From the source code I couldn't find any mention of DMA been activated for WLAN SPI, is that correct ? Just wondering if there's a technical limitation for that.
There's any plan to include DMA support for WIFI Shield ?

Best regards,
L.L
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iabdalkader
Posts: 1180
Joined: Sun May 24, 2015 3:53 pm

Re: WIFI Shield DMA support

Postby iabdalkader » Mon May 18, 2020 11:48 am

The WiFi performance has been improved since 3.6.2, if you have an older firmware please update first.
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kwagyeman
Posts: 4107
Joined: Sun May 24, 2015 2:10 pm

Re: WIFI Shield DMA support

Postby kwagyeman » Wed May 20, 2020 1:41 am

Performance should be in the 15 Mb/s range now. The performance was bad before because the firmware would wait for an ACK per packet. It no longer does.
Nyamekye,

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