Uint8Array structure

ldeluca

What are the read and write values for the Uint8Array arrays for each of the modules? Is this documented somewhere?

Eric

Currently, we don't have any public documentation available on the byte formats.  The closest thing out there is the source code for the Java API on the GitHub page.  

Some Java files of interest:

https://github.com/mbientlab/Metawear-AndroidAPI/blob/1.0.3/src/com/mbientlab/metawear/api/util/Registers.java

Check out the Register inner enum in each of the classes:

https://github.com/mbientlab/Metawear-AndroidAPI/tree/1.0.3/src/com/mbientlab/metawear/api/controller

Look bettween lines 238 and 552 for byte orderings

https://github.com/mbientlab/Metawear-AndroidAPI/blob/1.0.3/src/com/mbientlab/metawear/api/MetaWearBleService.java

doncoleman

In order to get the LED to light, what's the process? Set a Color Channel, then call Play?

Can any of the color channel arguments be omitted to turn the LED solid Blue or Red?

https://github.com/mbientlab/Metawear-AndroidAPI/blob/1.0.3/src/com/mbientlab/metawear/api/MetaWearBleService.java#L368

Eric

Yes that is correct, first set a color channel then play.  And yes, you can omit channels as they are controlled independently of each other.

ldeluca

going through the java code to figure out the structure is painful.  @eric, can you give us an example of changing the LED color?

Eric

The MetaWear app has examples covering most of the functions in the api.

https://github.com/mbientlab/Metawear-SampleAndroidApp/blob/2.1/src/com/mbientlab/metawear/app/LEDFragment.java#L157

ldeluca

I tried this:

data[0] = 0x02; // Color Register

        data[1] = 0x02; // always 2 on test

        data[2] = 0x00; // high intensity

        data[3] = 0x00; // low Intensity

        data[4] = 0xF4; // rise time

        data[5] = 0x01; // 

        data[6] = 0xF4; // Rise Time

        data[7] = 0x01; // High Time

        data[8] = 0xF4; // High Time

        data[9] = 0x01; // Fall Time

        data[10] = 0xD0; // Fall Time

        data[11] = 0x07; // Duration 2000

        data[12] = 0x00; // Duration 2000

        data[13] = 0x00; // Pulse Offset

        data[14] = 0x0A; // Pulse Offset 

        

        

AND THIS:

        // Blink Blue?

        var data = new Uint8Array(16);        

        data[0] = 0x02; // Color Register

        data[1] = 0x02; // Color Blue ??

        data[2] = 0x02; // Flash?

        data[3] = 0x31; // High Intensity

        data[4] = 0x0; // Low Intensity

        data[5] = 0xFF; // Rise Time

        data[6] = 0x0; // Rise Time

        data[7] = 0xFF; // High Time

        data[8] = 0x0; // High Time

        data[9] = 0xFF; // Fall Time

        data[10] = 0x01; // Fall Time

        data[11] = 0xD0; // Duration 2000

        data[12] = 0x07; // Duration 2000

        data[13] = 0xFF; // Pulse Offset

        data[14] = 0x0; // Pulse Offset

        data[15] = 0x0A; // Repeat Count 10

neither one of these caused the LED to light up.

ldeluca

I think i got it working.  wasn't enough to send the color information, also had to send the play command.  

HOW DO I RESET THE PATTERN.  I want to use a single color not a pattern.