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8814: clamp CCK TX rate to OFDM on 5GHz channels (fixes 5GHz TX, #50) #94

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8814: clamp CCK TX rate to OFDM on 5GHz channels (fixes 5GHz TX, #50) #94

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13 changes: 13 additions & 0 deletions src/RtlJaguarDevice.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -151,6 +151,19 @@ bool RtlJaguarDevice::send_packet(const uint8_t *packet, size_t length) {
}
}

/* CCK rates (1/2/5.5/11M) do not exist at 5GHz. The RTL8814AU silently
* drops a CCK-rated frame on a 5GHz channel — the bulk-OUT completes but
* nothing goes on-air (verified on hardware: default MGN_1M beacon = 0
* frames at ch36/ch100, but ~14k on-air once the rate is OFDM). 2.4GHz
* CCK is fine. So on a 5GHz channel, clamp a CCK rate to the lowest OFDM
* rate. (The 8812 chip happens to auto-fall-back CCK->OFDM at 5G; the
* 8814 does not, so we must do it in software.) */
if (_channel.Channel > 14 &&
(fixed_rate == MGN_1M || fixed_rate == MGN_2M ||
fixed_rate == MGN_5_5M || fixed_rate == MGN_11M)) {
fixed_rate = MGN_6M;
}

usb_frame = new uint8_t[usb_frame_length]();

ptxdesc = (struct tx_desc *)usb_frame;
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