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fmu-v6x: Increase Mavlink UART buffers 

Our serial_test showed only ~84kB/s with the default 256 RX buffer size
with significant ~2.5ms periods of the flow control RTS pin being
asserted. Increasing size to 600 (same as FMU-v5x) brings the throughput
only to ~190kB/s, while a size of >1500 achieves ~350kB/s. Larger RX
buffers do not increase throughput anymore, while the theoretical
maximum is 375kB/s.

Transmit buffer size is increased to 10kB same as on FMUv5x to prevent
any future differences in queue behavior and throughput. serial_test
showed ~350kB/s throughput at 3kB TX buffer size, so this is just a
precaution.
This commit is contained in:
Niklas Hauser 2023-05-31 10:36:07 +02:00 committed by Beat Küng
parent d2011e99b2
commit ebe152fc22
1 changed files with 2 additions and 1 deletions
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3
boards/px4/fmu-v6x/nuttx-config/nsh/defconfig
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@ -291,8 +291,9 @@ CONFIG_UART4_RXBUFSIZE=600
CONFIG_UART4_TXBUFSIZE=1500
CONFIG_UART5_IFLOWCONTROL=y
CONFIG_UART5_OFLOWCONTROL=y
CONFIG_UART7_RXBUFSIZE=1500
CONFIG_UART5_RXDMA=y
CONFIG_UART5_TXBUFSIZE=3000
CONFIG_UART5_TXBUFSIZE=10000
CONFIG_UART5_TXDMA=y
CONFIG_UART7_BAUD=57600
CONFIG_UART7_IFLOWCONTROL=y