having trouble with aa_i2c_read() function using TotalPhase Aardvark

Hi,

I am able to access the .NET driver via NET.addAssembly, connect and configure the hardware as well. I can also successfully write and read data over the i2c bus, which I have verified on the oscilloscope. However, for some reason the data is not being loaded into my data_in array. Please refer to my code below. Thank you!!!

clear all
close all

try
  NET.addAssembly('C:\\Matlab\i2c\total_phase\Test\aardvark_net.dll');
catch e
  e.message
  if(isa(e, 'NET.NetException'))
    e.ExceptionObject
  end
end

   obj=TotalPhase.AardvarkApi;
   port = 0;
   bitrate = 100;
   BUS_TIMEOUT = 150;  % ms

%%Open the device
        handle = obj.aa_open(port);
        if (handle <= 0)
            fprintf('Unable to open Aardvark device on port %d\n',...
                             port);
             disp(obj.aa_status_string(handle));
            return;
        end

%%Ensure that the I2C subsystem is enabled
obj.aa_configure(handle,  TotalPhase.AardvarkConfig.AA_CONFIG_GPIO_I2C);

%%Enable the I2C bus pullup resistors (2.2k resistors).
% This command is only effective on v2.0 hardware or greater.
% The pullup resistors on the v1.02 hardware are enabled by default.

obj.aa_i2c_pullup(handle, obj.AA_I2C_PULLUP_BOTH);

%%Power the EEPROM using the Aardvark adapter's power supply.
        % This command is only effective on v2.0 hardware or greater.
        % The power pins on the v1.02 hardware are not enabled by default.
        obj.aa_target_power(handle,...
                                     obj.AA_TARGET_POWER_BOTH);

%%Set the bitrate

          bitrate = obj.aa_i2c_bitrate(handle, bitrate);

          fprintf('Bitrate set to %d kHz\n', bitrate);

%%Set the bus lock timeout
        bus_timeout = obj.aa_i2c_bus_timeout(handle, BUS_TIMEOUT);
        fprintf('Bus lock timeout set to %d ms\n', bus_timeout);

%%operation here

data_in = uint8([0,0,0,0,0,0]);

device = hex2dec('1f');
data_out = [hex2dec('18'), hex2dec('c0')];

obj.aa_i2c_write(handle, uint16(device), TotalPhase.AardvarkI2cFlags.AA_I2C_NO_STOP, 2, uint8(data_out)); 
obj.aa_i2c_write(handle, uint16(device), TotalPhase.AardvarkI2cFlags.AA_I2C_NO_STOP, 1, uint8(hex2dec('06'))); 
count = obj.aa_i2c_read(handle, uint16(device), TotalPhase.AardvarkI2cFlags.AA_I2C_NO_FLAGS, 6, data_in);   %

%%Close the device and exit
obj.aa_close(handle);

Answer 1

[Morten Christophersen]

Hi

Have you made this work?

You should use data_in = NET.createArray('System.Byte',6)

instead of the data_in = uint8([0,0,0,0,0,0]).

However I still fail to make this work. I think that you problem lies elsewhere, however in interested if you successfully have made this work.

[Michael]

Did anyone get this to work?

[Jeff Baker]

Anyone?