STM CircleOS forum / CAN sampling point at 87.5% not supported

mnoxfeld · 2010-08-03 09:38:09

All CAN bus speeds up to 500 kbit/s must have the sampling point at 14 tq which is 87.5%.
There is no way I can set the CAN controller to this sampling point.
The problem lies in the design of the CAN controller where ratio between BS1 and BS2 allows max 80% sampling point.
Protocols like CAN Open specify sampling point at 85-90%.
Is this a flaw in the STM32 design?
Or is the CAN controller implemented simply not suitable for CAN speeds below 1 Mbit/s?

mnoxfeld · 2010-08-03 10:04:40

Seems I was wrong. The spreadsheet posted in this forum calculated the sample point wrong.

# 1 2010-08-03 09:38:09 CAN sampling point at 87.5% not supported (project: STM32 CAN baudrate calculation 1.0)

CAN sampling point at 87.5% not supported (project: STM32 CAN baudrate calculation 1.0)

# 2 2010-08-03 10:04:40 CAN sampling point at 87.5% not supported (project: STM32 CAN baudrate calculation 1.0)

Re: CAN sampling point at 87.5% not supported (project: STM32 CAN baudrate calculation 1.0)

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