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DShot timing improvements #149

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DShot timing improvements #149

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NightHawk32
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@NightHawk32 NightHawk32 commented Dec 18, 2024 •
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I observed that the DShot telemetry responses of L431 are sometimes not picked up correctly by betaflight due to 2 reasons:

  • the ARR timer config was not entirely correct --> Dhshot telemetry is transmitted at 5/4 the bitrate of tha command, so for DShot 300 this is 375kBit/s --> 2.75us/bitTimer running @40MHz 2.75e-6s*40MHz = 110
  • the MSI caused siginficant temperature drift, so I switched to HSI

That's the MSI drifting when heated up witrh a heatgun:
https://github.com/user-attachments/assets/b4a752c0-762f-486b-9145-2abaf7c73def

This is wich HSI:
https://github.com/user-attachments/assets/8c232ff9-8f6b-4ace-a406-ba07d1ed5a5e

This also aligns well with this PR in the bootloader: am32-firmware/AM32-bootloader#35

@tridge
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tridge commented Dec 19, 2024

thanks! I will test

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@NightHawk32 @tridge