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function [add_lap,add_check_point,elapsed_time_check_point] = get_car_position(track)
%GET_CAR_POSITION Reads the current values of the lap and check point
%counters, and resets them if they are not equal to zero.
%
% Tobias Lindell 2013-02-13
global mytaskh
global lib
switch nargin
case 1
add_lap = [];
add_check_point = [];
elapsed_time_check_point = [];
if isempty(mytaskh)
disp(['User needs to initialize counters for track ',num2str(track),' before getting car position!'])
clearvars -global mytaskh lib
return
end
switch track
case 1
if isfield(mytaskh,'ctr_1')
add_check_point = DAQmxReadCounterScalarU32(lib,mytaskh.ctr_1);
add_lap = DAQmxReadCounterScalarU32(lib,mytaskh.ctr_2);
read_ticks = DAQmxReadCounterScalarU32(lib,mytaskh.ctr_3);
else
disp(['User needs to initialize counters for track ',num2str(track),' before getting car position!'])
return
end
case 2
if isfield(mytaskh,'ctr_5')
add_check_point = DAQmxReadCounterScalarU32(lib,mytaskh.ctr_5);
add_lap = DAQmxReadCounterScalarU32(lib,mytaskh.ctr_6);
read_ticks = DAQmxReadCounterScalarU32(lib,mytaskh.ctr_7);
else
disp(['User needs to initialize counters for track ',num2str(track),' before getting car position!'])
return
end
otherwise
disp('Wrong track number sent to get_car_position!')
return
end
if add_check_point || add_lap
elapsed_time_check_point = read_ticks / 100;
start_race(track);
clear read_ticks
end
otherwise
disp('Wrong number of input arguments sent to get_car_position(track)! Should be 1!')
end
end
function Data = DAQmxReadCounterScalarU32(lib,taskh)
% function taskh = DAQmxReadCounterScalarU32(lib,taskh)
%
% this function reads a counter value from previously setup task
%
% inputs:
% lib - .dll or alias (ex. 'myni')
% taskh - taskhandle of analog inputs
%
%
% written by Tobias Lindell
% inspired by Nathan Tomlin (nathan.a.tomlin@gmail.com)
% v0 - 1302
DAQmx_Val_WaitInfinitely = -1.0;
reserved = [];
reserved_ptr = libpointer('uint32Ptr',reserved);
Data = 1;
data_ptr = libpointer('uint32Ptr',Data);
calllib(lib,'DAQmxReadCounterScalarU32',taskh,DAQmx_Val_WaitInfinitely,data_ptr,reserved_ptr);
counter = get(data_ptr);
Data = counter.Value;
end
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