Comments (2)
nwright-mcc
commented on August 12, 2024
The SPI bus on the Raspberry Pi is unable to keep up with continuous streaming from 7 x MCC 172s at 25.6 kHz (25.6kS/s * 2 channels * 7 devices = 358.4 kS/s aggregate). Per the data sheet, the max aggregate sample rate is 307.2 kS/s when using multiple MCC 172s, but this can vary with the type of Raspberry Pi used and the system load.
Some options are:
- Perform finite scans to the internal memory on each MCC 172 (48 kS available on each MCC 172) then read all the data before starting another scan
- Reduce the sample rate and run continuous scans
- Reduce the channel count and run continuous scans
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DrBwts
commented on August 12, 2024
How odd, today the setup is having no overruns at all at 25.6KHz continuous acquisition on all channels.
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