We have four identical µC systems based on STM32G081, running same, identical firmware.They receive commands via one, single RS-485 bus.One job is switching a GPIO pin from on to off.UART interrupt has highest prio (0), consuming task has highest prio (realtime).Occasionally one or more system (see LA pictures) are delayed.Delay is always the same (@24 MHz 3.7 ms, @ 64 MHz 1.8 ms).
May someone help in what is blocking the consuming task ?Best regards, Juergen
It turned out that it is/was a synchronizing problem between the four units.We thought having this eliminated by inserting a 'osDelay(1) before switching the outputs off.But osDelay seems not to work if the task calling osDelay is the only task currently running:The scheduler will not switch to idle task for 1 ms, but instead will run the calling task without delay.We now use __NOP() and that works.So the case can be closed.
Juergen Marquardt said:So the case can be closed
You do that:
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