About Marvin

Marvin · ‎05-04-2021

Ok thanks for your help, that was very informative. Then the EDT mode will not be the solution to my problem. Anyway you helped me to understand the BMA253 a little better.

Marvin · ‎05-04-2021

Thanks again for your answer, I think it has become much clearer to me how the interrupt engine works while the decivce is in lowpower mode. Maybe one or two more questions will bring me to the solution of my problem. I'm less interested in the continuously generated data, and more interested in the information about the event that led to the interrupt If I were to run the device in event-driven sleep mode (EDT) instead of EST and a high-G interrupt occurred, would any data regarding that interrupt be stored in the FIFO so that the host microcontroller could access it to get not only the information that an interrupt occurred, but also the value above the threshold?

Marvin · ‎04-30-2021

Thank you very much for your reply. So I understood correctly that the results of the interrupt engine are not stored in the FIFO. And I have to be more or less lucky that the interrupt is triggered exactly when a value is stored in the FIFO anyway? Or does this have something to do with the filtered or unfiltered data as input for the interrupt engine? Because if I use filtered data for the interrupt engine as well as for the normal measurement, which moves into the FIFO, then these are recorded in the same frequency. Which would mean that I would only have to read out the FIFO fast enough, right?

Marvin · ‎04-29-2021

Hello, First of all, I believe this topic is not exclusive to the BMA253 sensor, but is more general to all Bosch accelerometers. I run the BMA253 in lowpower mode 2, and the sleepttimer in equidistant-sampling mode. I have activated the high-g interrupt and catch this event. In my ISR I would like to read the FIFO to store the value(s) that led to the interrupt (with a timestamp). Unfortunately I don't get a value that is above the threshold when I read the FIFO after an interrupt. The question a bit more concrete: Are the values generated by the interrupt engine stored in the FIFO at all? I would be glad about helpful answers

Marvin · ‎04-01-2021

Thank you for your reply, but unfortunately I can't do much with it. Maybe my rather long explanation is a bit confusing. Yes, the High-G interrupt can be left out for now. Simply making the counters bigger is not a solution to my problem. The counters are only used to monitor the FIFO. With larger counters the problem that a lot of values over 15g occur although my device is just lying still and untouched would remain the same, I would just count it more often until the counter overflows. I need a solution or an explanation why so many values over 15g occur. According to my observation about 300 times in 20s. This can not be correct... I think. I hope it has now become a little clearer where my problem lies. Nevertheless I would be glad about any help.

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