www.pudn.com > SerialGPS.zip > WritePacket.m

function WritePacket(gps, id, data, type) 
% WritePacket Write the a packet with the given id and data 
% Since pid_dle_byte is used to delimit packet boundaries, if a data, size 
% or checksum value is equal to pid_dle_byte, a second pid_dle_byte is 
% immediately sent. This has the effect of "escaping" the first 
% pid_dle_byte. 
 
global pid_dle_byte 
 
if (nargin == 3) 
    type = 'uchar'; 
end 
 
WritePacketHeader(gps, id, length(data)*sizeof(type)); 
 
% Send the data as a stream of bytes 
for i=1:length(data) 
    fwrite(gps, data(i), type); 
    if (data(i) == pid_dle_byte) 
        fwrite(gps, pid_dle_byte); 
    end 
end 
 
WritePacketTerminator(gps, id, data, type);