I believe you have to calculate the CRC and include it in your packet, also
I would recommend to sniff the serial communication with a logic analyser.
I have a very simple snippet of an earlier test code while building a
library years ago, perhaps this can help (see below)
Regards,
--Antonio
openz1.m
*************************************
function [s] = openz1(COMX, name)
% Configures and open the serial port
% to communicate with Zolertia Z1 mote
% Arguments:
% COMX = COMM port assigned to the mote
s = serial(COMX);
s.Baudrate = 115200;
s.Name = name;
s.Terminator = 'LF';
s.DataBits = 8;
s.Parity = 'none';
s.StopBits = 1;
s.OutputBufferSize = 50960;
s.InputBufferSize = 50960;
s.ReadAsyncMode = 'continuous';
fopen(s)
if s.Status == 'open'
fprintf('Z1 (%s) connected to serial port %s\n', s.Name, s.Port);
else
disp('Failed to connect Z1, closing')
closeZ1(s);
end
***********************************************
send.m
***********************************************
clc;
clear all;
close all;
try
%% Open the serial port
[BS] = openz1('/dev/ttyUSB2', 'BS');
catch except
display('Unexpected error, Closing');
newobjs = instrfind;
fclose(newobjs);
clear all;
close all;
clc;
end
%% Create the packet (no CRC)
A = [126, 68, 38, 00, 00, 02, 00, 255, 13, 00, 67, 02, 50, 99, 00, 00, 00,
88, 00, 00, 00, 00, 00, 00, 0, 0, 126];
%% Compute CRCs
% PAYLOAD CRC : From byte 12 to 22
aux = 0;
for i = 11:1:21
aux = bitxor(aux, A(1,i+1));
end
[A(1,23) A(1,23)] = deal(bitshift(aux,-8));
A(1,24) = bitand(aux,255);
% PACKET PAYLOAD: 23 bytes lenght for packet CRC, starting from byte 2
crc = uint16(0);
temp = uint16(0);
for i = 1:1:23
buf = uint16(A(1,i+1));
buf = bitshift(buf,8);
crc = bitxor(crc,buf);
for j = 1:1:8
if crc >= 32768
temp = bitxor(bitshift(crc,1),4129);
else
temp = bitshift(crc,1);
end
crc = temp;
end
end
A(1,25) = bitand(crc,255);
A(1,26) = bitshift(bitand(crc,65280),-8);
fwrite(BS,A,'uchar')
*******************************************************
On Mon, Mar 18, 2013 at 5:02 AM, Jiang Lu <[email protected]> wrote:
> Hi
>
> I am writing a Matlab code for reading and writing data through serial
> port. Now, the reading is working, but writing is not.
>
> In Tinyos part, I followed the Lesson 4, Mote-PC serial communication, by
> changing BlinkToRadioAppC.nc to
>
> //components ActiveMessageC;
> //components new AMSenderC(AM_BLINKTORADIO);
> //components new AMReceiverC(AM_BLINKTORADIO);
> components SerialActiveMessageC;
> components new SerialAMSenderC(AM_BLINKTORADIO);
> components new SerialAMReceiverC(AM_BLINKTORADIO);
>
> App.Packet -> SerialAMSenderC.Packet;
> App.AMPacket -> SerialAMSenderC.AMPacket;
> App.AMControl -> SerialActiveMessageC;
> App.AMSend -> SerialAMSenderC.AMSend;
> App.Receive -> SerialAMReceiverC.Receive;
>
> In Matlab part :
>
> s = serial('COM11','BaudRate',57600,'DataBits',8);
> fopen(s);
> write_data = [0 255 255 0 0 4 0 6 0 1 0 1 ];
>
> % 0 synByte
> % 255 Destination Addr
> % 255 Destination Addr
> % 0 Link Source addr
> % 0 Link Source addr
> % 4 Message length
> % 0 Group ID
> % 6 am handler
> % 0 TOS node id
> % 1 TOS node id
> % 0 counter
> % 1 counter
>
> fwrite(s,write_data,'uint8');
> fclose(s);
>
> This should send data back to serial and in BlinkToRadioC.nc the
> Receive.receive should receive payload and setLeds(0x01) which means led 0
> on.
>
> But no data is received!
>
> Any suggestion?
>
> Thanks
>
> JL
>
> _______________________________________________
> Tinyos-help mailing list
> [email protected]
> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>
--
--
Antonio Liñan Colina
R+D+I Engineer
@: [email protected]
@: [email protected]
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