Obtain sets of data using serial communication

Hi all,

I wish to obtain sets of data which resulted from my robotic car through serial communication. The code that I written to obtain sets of from robotic car is as below. After troubleshooting for many time but the code still didn't worked.

s_port=serial('COM6','BaudRate',115200,'Parity','none'...              
      ,'DataBits',8,'FlowControl','none');
set(s_port,'InputBufferSize',15,'OutputBufferSize',15,'Timeout',1);
fopen(s_port);     
%send the time and speed to Robocar
fprintf(s_port,sprintf('%s %d', speed, sim_t));    

       %for loop to get receive granted signal for robotic car
       for i=1:(sim_t*10)

            access = fgetl(s_port);

            if (access == 'OK')
                break;
            end
        end

        %for loop to obtain sets of data
         for i=1:(sim_t*10)                                                      
            data = fgetl(s_port);                                               
            pause(0.001);
          end

[Walter Roberson]

What happens instead of it working?

[Shawn Chang]

If the code working, the robotic car will run based on the speed and time specified by user in matlab gui. Afterwards, obtain and process the data when matlab detected the string 'OK' sent by robotic car.

[Walter Roberson]

That is what it is intended to do: what happens instead? For example are any error messages produced?

Answer 1

[Walter Roberson]

Do not use "==" to compare strings: use strcmp() instead.