Hi All,
Following up on my previous post, I've made a DT overlay for the AD7176-2 based on an overlay for the AD7124-8. But I'm still running into the same issue that the device is not able to be selected.
This is my DT Overlay
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
fragment@0 {
target-path = "/";
__overlay__ {
vref: fixedregulator@0 {
compatible = "regulator-fixed";
regulator-name = "fixed-supply";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-boot-on;
};
};
};
fragment@1 {
target-path = "/";
__overlay__ {
clocks {
ad7176_mclk: clock@0 {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <16000000>;
};
};
};
};
fragment@2 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
ad7176@0 {
compatible = "adi,ad7176-2";
reg = <0>;
spi-max-frequency = <5000000>;
interrupts = <25 2>;
interrupt-parent = <&gpio>;
refin1-supply = <&vref>;
clocks = <&ad7124_mclk>;
clock-names = "mclk";
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
diff-channels = <0 1>;
};
channel@1 {
reg = <1>;
diff-channels = <2 3>;
};
};
};
};
fragment@3 {
target = <&spidev0>;
__overlay__ {
status = "disabled";
};
};
fragment@4 {
target = <&spidev1>;
__overlay__ {
status = "disabled";
};
};
};
And this is the error message I get;
Traceback (most recent call last):
File "/home/analog/AD7176/AD7176_adi.py", line 4, in <module>
my_adi = adi.ad717x(uri="local:")
File "/usr/local/lib/python3.9/dist-packages/adi/ad717x.py", line 85, in __init__
raise Exception("Error in selecting matching device")
Exception: Error in selecting matching device
I have compiled using the command; $ dtc -O dtb -o rpi-ad7176-myOverlay.dtbo rpi-ad7176-myOverlay.dts in Kuiper Linux command line and moved the .dtbo file into the /boot/overlays folder. I've added the following line into the /boot/config.txt file; dtoverlay=rpi-ad7176-myOverlay.
Any insight into where I'm going wrong would be greatly appreciated.
I'd also like to make the inputs single ended (I believe you have to specify this in the .dts/.dtbo file) - if anyone has an example they can show me of how to do this that'd be awesome!