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## Copyright (C) 2019-2021 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 {} {} write (@var{dev}, @var{datain})
## @deftypefnx {} {} write (@var{dev}, @var{datain}, @var{precision})
## Write data to a I2C or serial device object
## using optional precision for the data byte used for the data.
##
## @subsubheading Inputs
## @var{dev} - connected i2c or serial device opened using device
##
## @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 write (dev, datain, precision)
persistent endian;
if isempty(endian)
[~, ~, endian] = computer ();
endif
persistent ARDUINO_I2C_WRITE = 6;
persistent ARDUINO_SERIAL_WRITE = 2;
if nargin < 2 || nargin > 3
print_usage ();
endif
if !strcmp(dev.interface, "I2C") && !strcmp(dev.interface, "Serial")
error("@device.write: not a I2C or Serial device");
endif
if nargin == 3
if !ischar (precision)
error ("@device.write: expected presision to be a atring");
endif
precision = tolower (precision);
if !strcmp (precision, "uint8") && !strcmp (precision, "int8") && !strcmp (precision, "uint16") && !strcmp(precision, "int16")
error ("@device.write: expected pression to be (u)int8 or (u)int16 string");
endif
else
precision = 'uint8';
endif
if (strcmp (precision,'uint16'))
datain = uint16(datain);
if (endian != getEndian(dev.parent))
datain = swapbytes (datain);
endif
datain = typecast (datain, 'uint8');
elseif (strcmp (precision,'int16'))
datain = int16(datain);
if (endian != getEndian(dev.parent))
datain = swapbytes (datain);
endif
datain = typecast (datain, 'uint8');
else
if (strcmp (precision, 'int8'))
datain = typecast (int8(datain), 'uint8');
else
datain = typecast (uint8(datain), 'uint8');
endif
endif
% write request
if strcmp(dev.interface, "I2C")
[tmp, sz] = sendCommand (dev.parent, "i2c", ARDUINO_I2C_WRITE, [dev.devinfo.bus dev.devinfo.address datain]);
else
[tmp, sz] = sendCommand (dev.parent, "serial", ARDUINO_SERIAL_WRITE, [dev.devinfo.id datain]);
endif
endfunction
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