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## Copyright (C) 2019 John Donoghue <john.donoghue@ieee.org>
##
## This program is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
## -*- texinfo -*-
## @deftypefn {} {} writeRegister (@var{dev}, @var{reg}, @var{datain})
## @deftypefnx {} {} writeRegister (@var{dev}, @var{dev}, @var{datain}, @var{precision})
## Write data to i2c device object at a given registry position
## using optional precision for the data byte used for the data.
##
## @subsubheading Inputs
## @var{dev} - connected i2c device opened using device
##
## @var{reg} - registry position to write to.
##
## @var{datain} - data to write to device. Datasize should not exceed the constraints
## of the data type specified for the precision.
##
## @var{precision} - Optional precision for the input write data.
## Currently known precision values are uint8 (default), int8, uint16, int16
##
## @seealso{arduino, device, read}
## @end deftypefn
function writeRegister (dev, reg, datain, precision)
persistent endian;
if isempty (endian)
[~, ~, endian] = computer ();
endif
persistent ARDUINO_I2C_WRITEREG = 8;
if nargin < 3 || nargin > 4
print_usage ();
endif
if !strcmp(dev.interface, "I2C")
error("@device.writeRegister: not a I2C device");
endif
if ~isnumeric (reg)
error("@device.writeRegister: expected reg to be a number");
endif
if nargin == 4
if !ischar (precision)
error ("@device.writeRegister: expected precision to be a string");
endif
precision = tolower (precision);
if !strcmp (precision, "uint8") && !strcmp (precision, "int8") && !strcmp (precision, "uint16") && !strcmp(precision, "int16")
error("@device.writeRegister: expected pression to be (u)int8 or (u)int16 string");
endif
else
precision = 'uint8';
endif
% todo convert reg, data in to correct format
if (strcmp (precision,'uint16'))
reg = uint16 (reg);
datain = uint16 (datain);
if (endian != getEndian(dev.parent))
reg = swapbytes (reg);
datain = swapbytes (datain);
endif
reg = typecast (reg, 'uint8');
datain = typecast (datain, 'uint8');
elseif (strcmp (precision,'int16'))
reg = uint16 (reg);
datain = int16 (datain);
if (endian != getEndian(dev.parent))
reg = swabytes (reg);
datain = swapbytes (datain);
endif
reg = typecast (reg, 'uint8');
datain = typecast (datain, 'uint8');
else
if (strcmp (precision, 'int8'))
reg = typecast (int8(reg), 'uint8');
datain = typecast (int8(datain), 'uint8');
else
reg = typecast (uint8(reg), 'uint8');
datain = typecast (uint8(datain), 'uint8');
endif
endif
sendCommand (dev.parent, "i2c", ARDUINO_I2C_WRITEREG, [dev.devinfo.bus dev.devinfo.address reg datain]);
endfunction
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