<div dir="ltr"><div><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font color="#24292e" face="SFMono-Regular, Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size:12px;white-space:pre">That's how erlang part communicates with C part.</span></font></span></div><div><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font color="#24292e" face="SFMono-Regular, Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size:12px;white-space:pre"><a href="https://github.com/tomszilagyi/gen_serial/blob/master/src/gen_serial.erl">https://github.com/tomszilagyi/gen_serial/blob/master/src/gen_serial.erl</a></span></font></span><font color="#24292e" face="SFMono-Regular, Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size:12px;white-space:pre">#L622</span></font></div><div><span style="color:rgb(36,41,46);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;white-space:pre;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><font face="monospace, monospace">-define(PACKET_DATA, $d).</font><div><font face="monospace, monospace"><br>send(#gen_serial{port = Port}, Data) -><br> true = port_command(Port, [<<?PACKET_DATA:8>> | Data]),<br> ok.</font><br></div><div><font face="monospace, monospace"><br></font></div><div><font face="arial, helvetica, sans-serif">Maybe port_command does not expect an improper list — try one of these:</font></div><div><font face="arial, helvetica, sans-serif"><span style="font-family:sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">* gen_serial:bsend(P,[<<20,80,0,0</span><span style="font-family:sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">,1>>]) % Your binary wrapped in a list</span></font></div><div><font face="arial, helvetica, sans-serif"><span style="font-family:sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">* gen_serial:bsend(P,[20,80,0,0</span><span style="text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">,1]) % data as list instead of binary</span></span></font></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Jun 19, 2018 at 7:22 PM Bob Cowdery <<a href="mailto:bob@bobcowdery.plus.com">bob@bobcowdery.plus.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks for all the suggestions. Still a little confused. The number is <br>
an integer, actually a frequency in Hz plus a command byte at the end <br>
which is being sent over a serial connection in hex format using <br>
gen_serial.<br>
<br>
This command works: gen_serial:bsend(P, <br>
<<16#14,16#50,16#00,16#00,16#01>>). where P is the open Port.<br>
<br>
However, when I use any of the methods to create a hex version they all <br>
end up with <<20,80,0,0,1>> which to my mind is the decimal equiv of above.<br>
<br>
If I fire that I get:<br>
<br>
5> gen_serial:bsend(P,<<20,80,0,0,1>>).<br>
** exception error: bad argument<br>
in function port_command/2<br>
called as port_command(#Port<0.470>,[<<"d">>|<<20,80,0,0,1>>])<br>
in call from gen_serial:send/2 (gen_serial.erl, line 624)<br>
in call from gen_serial:bsend/3 (gen_serial.erl, line 706)<br>
<br>
What is <<"d">> doing in there?<br>
<br>
<br>
On 6/19/2018 4:32 PM, Bob Cowdery wrote:<br>
> If I have a number, say 1450000001 and I want to represent that as a <br>
> binary in the form<br>
><br>
> <<16#14,16#50,16#00,16#00,16#01>> what's the best way.<br>
><br>
> I'm not sure what list_to_binary(integer_to_list(1450000001)) which <br>
> prints as <<"1450000001">> produces but I guess its 10 bytes not 5.<br>
><br>
> BobC<br>
><br>
> _______________________________________________<br>
> erlang-questions mailing list<br>
> <a href="mailto:erlang-questions@erlang.org" target="_blank">erlang-questions@erlang.org</a><br>
> <a href="http://erlang.org/mailman/listinfo/erlang-questions" rel="noreferrer" target="_blank">http://erlang.org/mailman/listinfo/erlang-questions</a><br>
<br>
_______________________________________________<br>
erlang-questions mailing list<br>
<a href="mailto:erlang-questions@erlang.org" target="_blank">erlang-questions@erlang.org</a><br>
<a href="http://erlang.org/mailman/listinfo/erlang-questions" rel="noreferrer" target="_blank">http://erlang.org/mailman/listinfo/erlang-questions</a><br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><font face="'courier new', monospace">Danil Zagoskin | <a href="mailto:z@gosk.in" target="_blank">z@gosk.in</a></font></div></div></div>