Uint8Array structure

Comments

• Eric

  August 2014

  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

  August 2014

  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

  August 2014

  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

  August 2014

  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

  August 2014

  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

  September 2014

  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

  September 2014

  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.