higher sample rate about high-pricision_ad_hat HOT 5 OPEN

I have just had a look at the c implementation on the pi zero2 W

Firstly, there are some optimizations you can do for the SPI communications; You can request multiple bytes from the lower level librarys, instead of going back and forth asking for each byte at a time. This will gain you approx 1KHz straight off.

Secondly, the clock is set to 1MHz, changing this will get you a much higher sampling rate. The clocks are hardcoded. BCM driver needs to set a clock divider, while the wiringpi, and dev lib need to be set. My clock seems to top out at 22MHz. This can be configured in /lib/config/dev_config.c under DEV_module_init.

With the above changes, 35KHz can be achieved with wiring pi.

I was a little bit surprised that not requesting the status bytes actually slowed down the sampling rate.

I feel a better interface to the underlying libraries would be beneficial.

Hope this helps.

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Roughly the same problem here. @ChironeX1976 did you found any solutions?

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@ChironeX1976 Read the FAQ in this link. There you can find the reason of low sps and an example code with higher rate (in both c an python). Hope this helps.

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Hello, I was looking at buying this ADC for audio as well. I have a very basic question about the 38400 SPS. If you plug in multiple microphones, would the sample rate be divided by the number of microphones, or is this a per-channel figure?

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