ardupilot/libraries/AP_Airspeed/models/NMEA_Sensor.m

56 lines
1.6 KiB
Matlab

clc
clear
% This is a example of using MATLAB to test a sensor drive using TCP
% we send a NMEA messages at 1hz, note that this assumes that SITL is
% running at real time.
% NMEA is a basic one way protocol but more complex protocols can be
% implemented in the same way
% Use the same TCP/UDP libbary that is used for MALTAB SITL
addpath(genpath('../../SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6'))
% if this dosn't work try the MALTAB SITL example first
pnet('closeall')
% Init the TCP port, 5763 is serial 2
u = pnet('tcpconnect','127.0.0.1',5763);
flipflop = true;
while(true)
if flipflop
% send MTW temp message
water_temp = 10 + randn();
NMEA_string = sprintf('$YXMTW,%0.1f,C',water_temp);
else
% send VHW speed message
water_speed_knots = 5 + randn()*2;
water_speed_kph = water_speed_knots * 1.852;
NMEA_string = sprintf('$VWVHW,,T,,M,%0.1f,N,%0.1f,F',water_speed_knots,water_speed_kph);
end
flipflop = ~flipflop;
% Calculate the correct checksum
NMEA_string = add_checksum(NMEA_string);
% send to ap
pnet(u,'printf',sprintf('%s\r\n',NMEA_string));
pnet(u,'writepacket');
% also print to MATLAB console
fprintf("%s\n",NMEA_string);
% 1hz (ish)
pause(1);
end
function NMEA_string_out = add_checksum(NMEA_string_in)
checksum = uint8(0);
for i = 2:numel(NMEA_string_in)
checksum = bitxor(checksum,uint8(NMEA_string_in(i)),'uint8');
end
NMEA_string_out = sprintf('%s*%s',NMEA_string_in,dec2hex(checksum));
end