Using AD7949 with pyadi-iio

Question

Hello,
I am trying to access an AD7949 via I2C (Raspberry PI) with pyadi-iio. In Github this is listed as supported hardware. However, I can't find any reference to it in the documentation. Did I miss something?

I use libiio 0.25, pyadi-iio 0.0.17.

Thanks a lot

Banana · Accepted Answer

Hi machschmitt, Thank you for your kind answer. I removed 'spi-cpol' and also tried to set 'spi-mode' = <0>, which should result in cpol == cpha == 0. Both did not help. Also could there be a problem with a wrong keyword in the overlay? I am stating vref-supply, but the documentation refers to adi,internal-ref-microvolt - could this be an issue. Also, I noticed if I 'watch iio_info' the raw values are changing randomly without any voltage attached (compatible = "brcm,bcm2708"). After that i tried the same thing with an overlay compatible = , since I am using it with a Raspberry Pi 4. After that, the iio_info raw_values do not change any longer. At the moment it is quite frustrating because I don't know if the overlay, the driver or something else is causing this error message. Thanks anyway -Max)

Banana · Answer

Added fragment@0 { target = "/"; __overlay__ { adc_vref: fixedregulator@0 { compatible = "regulator-fixed"; regulator-name = "fixed-supply"; regulator-min-microvolt = ; regulator-max-microvolt = ; regulator-boot-on; }; to the overlay. see also: https://ez.analog.com/linux-software-drivers/f/q-a/87850/ad7193-driver-with-raspberry-pi

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Using AD7949 with pyadi-iio

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