APA102 on Intel Edison: Unknown I/O name SPI2

[Zitt]

I'm writing my second Android app using AndroidThings... first being a blink demo. So admittedly; I'm likely out of my element.

When I run my application; I'm getting the following error on the following lines:

            Log.d(TAG, "Initializing LED strip");
            mApa102 = new Apa102(apa102BusName, LED_MODE);

where private static final String apa102BusName = "SPI2";

LogCat reports:

11-26 07:36:55.008 19031-19031/com.pinball_mods.zitt.edisontest D/HomeActivity: Initializing LED strip
11-26 07:36:55.019 19031-19031/com.pinball_mods.zitt.edisontest I/HomeActivity: Unable to configure SPI2 for APA102 led strip
                                                                                com.google.android.things.pio.PioException: android.os.ServiceSpecificException: Unknown I/O name SPI2
...

Do I have a broken Edison build chain? What am I missing

[Zitt]

More debugging shows that

PeripheralManagerService service = new PeripheralManagerService();       

        List<String> deviceList = service.getSpiBusList();
        for(String dev : deviceList) {
            Log.i(TAG, dev);
        }

returns SPI2.1 instead of SPI2.

Using that string instead of SPI2... still doesn't work; but fails in a different way:

11-26 08:39:41.245 1466-1466/com.pinball_mods.zitt.edisontest I/HomeActivity: Unable to configure SPI2.1 for APA102 led strip
                                                                              com.google.android.things.pio.PioException: android.os.ServiceSpecificException: SPI2.1 failed to apply the required pin mux
                                                                                  at com.google.android.things.pio.SpiDeviceImpl.<init>(SpiDeviceImpl.java:41)

[Fleker]

Looks like the Edison is using those pins for multiple things. There may be a way to configure the pin muxing on the system, but since that platform is deprecated it may not be high priority.

Are you using IO10-13 for anything else? Do you have any other apps currently installed?

[Zitt]

Sorry; missed this update; received no email.

I am using IO13 for the LED blink as a heartbeat indicator. I commented out that code; and I'm not getting any exceptions. I'm going to wire a stip up and see if it works.

[Zitt]

Good call. IO13 / led blink was the cause. IO13 shares the LED with one of the SPI pins on Intel Edision which was causing all of the issues. Closing this as not a bug.