Hi Antonio,
After checking my packet CRC, now the writing to serial part is working!
Thank you so much for your help!
JL
On Mon, Mar 18, 2013 at 3:41 AM, Antonio Linan <ali...@zolertia.com> wrote:
> 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 <j...@crimson.ua.edu> 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
>> Tinyos-help@millennium.berkeley.edu
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>
>
>
> --
> --
> Antonio Liñan Colina
> R+D+I Engineer
> @: ali...@advancare.com
> @: ali...@zolertia.com
> ------------------------------
> Advancare
> T: +34 93 582 02 70
> http://www.advancare.com
> http://www.zolertia.com
> http://zolertia.sourceforge.net
> http://webshop.zolertia.com
>
--
Jiang Lu
Electrical and Computer Engineering****
Office: SERC 3041
The University of Alabama****
Tuscaloosa, AL 35487-0286
Email: j...@crimson.ua.edu
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