function?[out_descript?outdata?timedata]?=?wfm_ascii_dpo（fname?data_start?data_stop）

%?Converts?TSD5/6/7k?and?DPO7k/70k?.wfm?file?to?ASCII?format?
%?with?time?array
%
%?data_start?and?data_stop?input?arguments?are?optional
%?and?can?be?used?to?read?parts?of?file
%
%?To?do:?implement?fast?frame?pixel?maps
%

out?=?[];
if?nargin==0????????
????fname=‘‘;
end

if?isempty（fname）
????[filenamepname]=uigetfile（{‘*.wfm‘?‘Tektronix?Waveform?Files?（*.wfm）‘;‘*.*‘?‘All?Files?（*.*）‘}‘Choose?Tektronix?WFM?file‘）;
????fname=[pname?filename];
end

%---Open?file
fd?=?fopen（fname‘r‘）;
if?fd==-1
????error（‘Problem?opening?file?“%s“‘fname）
end

%---Determine?byte?ordering?then?close?and?reopen?with?proper?byte?ordering
ByteOrder?=?fread（fd1‘ushort‘）;
if?ByteOrder==6