Thread Subject: Serial Port Communication

Hi,
I have a problem with serial communication via RS232 port.
I am working with Xilinx's software (SDK) and Matlab.
I am programming a Microblaze in language C and I need to send and receive data through serial port.
I need to send Matlab and to receive to FPGA in 4.350 times. I created a loop to send and receive data, but it's only working 50 times.

Can you help me?
Can you look at my code?

====================================
In Matlab, I have (9600 bps):
====================================
s1 = serial('COM1');
set (s1, 'timeout', 60);
set (s1,''terminator',0);
set(s1,'inputbuffersize',1024);
fopen(s1);
% I have a ciclo the calculate the inputs data of the microprocessor

for i=3:N1-2 % it's 4.350
    finputs = []; % for the first time the inputs are [0,0,0,0]
    finputs = [y(i-1);y(i-2);u(i-1);u(i-2)];

    ynew = nnoutput(NetDeff,W1f,W2f,finputs);% ynew = 1.9965e-004 here is a floating point
    ynew2 = num2str (ynew); % here I convert floating point to string, because in the microprocessor only receive string
    y(i)= ynew;

    fprintf(s1,ynew2); %here I send the string to microprocessor

    % I must receive the data of the microprocessor. The microprocessor sends to Matlab a string

    unew = fscanf(s1,'%f'); %here I convert the string to floating point
    u(i)= unew;

end

fclose (s1)

plot (u);
plot(y);

delete(s1)
clear s1

====================================
In SDK, I have:
====================================
      
    //LOOP TO SEND AND TO RECEIVE
    for(ind = 0; ind < size_ind; ind++)
    {
    
        ReceivedCount = 0;
        ReceivedCount = XUartLite_Recv(&UartLite, RecvBuffer, TEST_BUFFER_SIZE); //I'm receiving here
        double entr2 = atof(RecvBuffer);
    
        ...
  
        result = neur->activ;
    
        char data[15];
        sprintf(data,"%f",result);
              
        print(data);
        SentCount = XUartLite_Send(&UartLite, SendBuffer,TEST_BUFFER_SIZE); //I'm sending here
                                
                    
        }
        
=====================================
 
Thanks

"Gisnara " <brasergis@hotmail.com> wrote in message <h15375$cc7$1@fred.mathworks.com>...
> Hi,
> I have a problem with serial communication via RS232 port.
> I am working with Xilinx's software (SDK) and Matlab.
> I am programming a Microblaze in language C and I need to send and receive data through serial port.
> I need to send Matlab and to receive to FPGA in 4.350 times. I created a loop to send and receive data, but it's only working 50 times.
>
> Can you help me?
> Can you look at my code?
>
> ====================================
> In Matlab, I have (9600 bps):
> ====================================
> s1 = serial('COM1');
> set (s1, 'timeout', 60);
> set (s1,''terminator',0);
> set(s1,'inputbuffersize',1024);
> fopen(s1);

Can you list your error messages from the 2 files to anyone have better chances to help you?

From your 2 files.

Thanks for understanding!


> % I have a ciclo the calculate the inputs data of the microprocessor
>
> for i=3:N1-2 % it's 4.350
> finputs = []; % for the first time the inputs are [0,0,0,0]
> finputs = [y(i-1);y(i-2);u(i-1);u(i-2)];
>
> ynew = nnoutput(NetDeff,W1f,W2f,finputs);% ynew = 1.9965e-004 here is a floating point
> ynew2 = num2str (ynew); % here I convert floating point to string, because in the microprocessor only receive string
> y(i)= ynew;
>
> fprintf(s1,ynew2); %here I send the string to microprocessor
>
> % I must receive the data of the microprocessor. The microprocessor sends to Matlab a string
>
> unew = fscanf(s1,'%f'); %here I convert the string to floating point
> u(i)= unew;
>
> end
>
> fclose (s1)
>
> plot (u);
> plot(y);
>
> delete(s1)
> clear s1
>
> ====================================
> In SDK, I have:
> ====================================
>
> //LOOP TO SEND AND TO RECEIVE
> for(ind = 0; ind < size_ind; ind++)
> {
>
> ReceivedCount = 0;
> ReceivedCount = XUartLite_Recv(&UartLite, RecvBuffer, TEST_BUFFER_SIZE); //I'm receiving here
> double entr2 = atof(RecvBuffer);
>
> ...
>
> result = neur->activ;
>
> char data[15];
> sprintf(data,"%f",result);
>
> print(data);
> SentCount = XUartLite_Send(&UartLite, SendBuffer,TEST_BUFFER_SIZE); //I'm sending here
>
>
> }
>
> =====================================
>
> Thanks

I posted by mistake sry:(. I'm a little tired.

Can you show us your message of erros from the 2 files so that anyone who worked before has better chances to help you!

Thanks for your understanding!

ok.
Sending and receiving data occurs 50 times without problems, after it indicates that:
" ??? In an assignment A(I) = B, the number of elements in B and I must be the same
Error in ==> u(i) = unew; "
and not complete the cycle 4350 times.
I can't get points for building the plots u and y.

Thanks.

Error in ==> u(i) = unew;
You start "i = 3" What about the u(1),u(2) elements?
You should also try:
u=[];
For...
    ....
    u = [u;element_received];
end
regards