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## Copyright (C) 2020 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 {} {} delete (@var{dev})
## Free resources of a device object.
##
## @subsubheading Inputs
## @var{dev} - object to free
##
## @seealso{device}
## @end deftypefn
function delete(this)
try
ar = this.parent;
resource = this.resourceowner;
pins = this.pins;
if !isempty(ar)
if strcmp(resource, "i2c")
cleanupI2Cdevice(ar, resource, pins)
elseif strcmp(resource, "spi")
cleanupSPIdevice(ar, resource, pins)
elseif strcmp(resource, "serial")
cleanupSerialdevice(ar, resource, pins)
endif
this.parent = [];
endif
catch
# do nothing
end_try_catch
endfunction
# private clean up allocated pins
function cleanupI2Cdevice(ar, resource, pins)
# currently doing nothing
x = resource;
endfunction
function cleanupSerialdevice(ar, resource, pins)
# currently doing nothing
x = resource;
endfunction
# private clean up allocated pins
function cleanupSPIdevice(ar, resource, pins)
for i=1:numel(pins)
pin = pins{i};
if strcmp(tolower(pin.func), "cs")
configurePinResource(ar, pin.name, pin.owner, pin.mode, true);
configurePin(ar, pin.name, pin.mode);
endif
endfor
# clean up the spi port if not used?
count = getResourceCount(ar, resource);
if count > 0
count = decrementResourceCount(ar, resource);
if count == 0
# last user, so free pins (except ss that we already did)
pins = getSharedResourceProperty(ar, resource, "pins");
for i=1:numel(pins)
pin = pins{i};
configurePinResource(ar, pin.name, pin.owner, pin.mode, true);
configurePin(ar, pin.name, pin.mode);
endfor
endif
endif
endfunction
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