Protocol custom I2C Reading Problem

[Joao Paulo]

Hello,

I think I need a bit of help. Then, here goes my case

What do I need to accomplish?

• Read the TSL2561 sensor; ( Here is the help I need now )
• Convert the values from the sensor using an exponential equation.  (please, point me out some reading on doing so)
• Export the values to a CSV file; (please, point me out some reading on doing so)

What is going on?

• I'm trying to use the instrument protocol in the custom tab, but I'm having a hard time to figure out why I'm having the output attached for that code.
• I see that 

  if(!Write(adr, 0x80, 0x03)) return "Communication error.";

  Works just fine and outputs correctly

           

 

• But the lines 

  Read(adr, [0xAC], 2);
  Read(adr, [0xAE], 2);

  Are giving me incorrect output as in the picture.

What have I tried?

If I run only one reading, I get it correctly:

Read(adr, [0xAC], 2);

Please, see in the picture that Forum_case_I2C_read_outpu.png that it tried to perform 4 readings while I passed only 2 as the parameter. 

Further question?

• Is that a way enable line number in the editor?

What is my environment?

• Instrument: Analog Discovery 2
• IDE: Waveforms 3.10.9

 

Thanks,

 

[attila]

Hi @Joao Paulo

The WF beta v3.11.10 adds support for multiple I2C transfers in sensor loop function:
https://forum.digilentinc.com/topic/8908-waveforms-beta-download/
In earlier version only one I2C read or write was supported in the loop.

Thank you for the observation.

function loop(){
    var tm = Read(adr, 0x2D, 1);
    var rg = Read(adr, 0xF2, 6);