Sensor MMA8451 and Hardware Choice

luigi5hd — Tue, 12 Mar 2019 14:57:44 GMT

Goodmornig,

I have an hardware question.

I'm using the sensor mma8451 with a datarate of 800Hz and a Raspberry Pi 2B with a quad-core CPU 900MHz and RAM 1GB. Could be enough right? So why I don't have 800 samples every second? (I have only 200 samples per second)

Is it a bus problem? Should I use the 2 bus in parallel on the same sensor?

Thank you in advance

Luigi

Re: Sensor MMA8451 and Hardware Choice

CarlosCasillas — Tue, 12 Mar 2019 20:14:34 GMT

Hi Luigi,

Could you please try to be more specific with your question and the relation with i.MX processors?

The MMA8451 is a NXP digital accelerometer that communicates with a host processor by I2C bus, so, you will need to ensure the I2C driver have enough bandwidth and/or speed transfer, and also, the I2C driver architecture (if using polling, checking the polling period, or if using interrupts, checking the interrupt priority/latency according with the Operating System running on the host processor).

Hope this will be useful for you.
Best regards!
/Carlos
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Sensor MMA8451 and Hardware Choice

Re: Sensor MMA8451 and Hardware Choice