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devicetree: Reduce LoRa SPI frequency to allow reliable communciation

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The heltec_wireless_stick_lite_v3 board does not properly handle
receive operations when the SPI used to communicate with onboard SX1262 has
the clock frequency set too high. This causes radio recv operation to
almost always hang forever without any error, as the SX1262 module returns
0xFF00 value as the interrupt status which does not make any sense, thus
causing the LoRaWAN library to trigger RXTX timeout handler which in the
current SX1262 driver implementation is not privded. The issue occurs
almost always, sometimes allowing to receive few (3-5) tranmissions
correctly, then fail. The root of the problem is not known for sure, but it
is highly likely a board's limitation, though not confirmed by the
manufacturer.
The current SPI frequency was chosen arbitrarily based on the conducted
experiments where the 30 000 messages have been received continiously
without any problems (with 5s interval for each message).

Signed-off-by: Patryk Biel <pbiel7@gmail.com>
This commit is contained in:
Patryk Biel 2024-08-20 15:55:26 +02:00 • committed by Anas Nashif
commit 816708aa4d
1 changed files with 1 additions and 1 deletions
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2
boards/heltec/heltec_wireless_stick_lite_v3/heltec_wireless_stick_lite_v3_procpu.dts
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@ -128,7 +128,7 @@
dio2-tx-enable;
dio3-tcxo-voltage = <SX126X_DIO3_TCXO_1V8>;
tcxo-power-startup-delay-ms = <5>;
spi-max-frequency = <16000000>;
spi-max-frequency = <4000000>;
};
};