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function values = cmd_digital_in(h,pin_no)
// Command to read in digital signal from a connected Arduino board
//
// Calling Sequence
// values = cmd_digital_in(h,pin_no)
//
// Parameters
// h : Board number, reserved for future use. For this version, any number would do
// pin_no : Digital pin to measure the signal
//
// Description
// The Arduino board has a set of logical ports (digital) that are used for writing or reading data from a component.
//
// To map a UNO, ports 2-13 are available (0 and 1 are used for serial transmission). For MEGA board, ports 2-53 are available. The port takes the low logic level (0) or logic high (1) which corresponds to the reference voltage.
//
// Examples
// ok = open_serial(1,9,115200)
// val = cmd_digital_in(1,2)
// close_serial(1)
//
// See also
// cmd_digital_out
//
//
// Authors
// Bruno JOFRET, Tan C.L.
//
if isvector(pin_no)
for cnt = 1: size(pin_no,2)
pin="Da"+ascii(48+pin_no(cnt))+"0";
write_serial(h,pin,4);
pin="Dr"+ascii(48+pin_no(cnt));
write_serial(1,pin,3);
//binary transfer
[a,b,c]=status_serial(h);
while (b < 1)
[a,b,c]=status_serial(h);
end
values(cnt)=strtod(read_serial(h,1));
end
else
pin="Da"+ascii(48+pin_no)+"0";
write_serial(h,pin,4);
pin="Dr"+ascii(48+pin_no);
write_serial(1,pin,3);
//binary transfer
[a,b,c]=status_serial(h);
while (b < 1)
[a,b,c]=status_serial(h);
end
values=strtod(read_serial(h,1));
end
endfunction
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