5 Replies Latest reply on Dec 31, 2015 2:45 AM by JoMe_264151

    Communication between MatLab and PSoC 4, through UART

    userc_40634
    userc_40634 Dec 30, 2015 3:18 AM

      Hi ,people. I'm try to connect PSoC 4 pioneer Kit with MatLab to graphing the data. when i receive one data the program work fin, but when add more sensor i have problem. the information was plotted is wrong, don't have coherence.

         

      then, some one could give me suggestion??

         


      very thanks in advance

         

      happy new year..!

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        • 1. Re: Communication between MatLab and PSoC 4, through UART
          rohitk_
          rohitk_ Dec 30, 2015 3:26 AM (in response to userc_40634)

          It is difficult to say anything about the interface unless one has seen the code on both side (PSoC 4 BLE, MATLAB).

             

          But from your description, could it be an issue with the string of data sent from PSoC 4 BLE to MATLAB?

          • 2. Re: Communication between MatLab and PSoC 4, through UART
            userc_40634
            userc_40634 Dec 30, 2015 4:13 AM (in response to userc_40634)

            In the side of MatLab (which controlled the communication)

               

                fprintf(serial_PSoC,'%c','a');%with this i select which sensor I want to graphic
                   pause(0.1);
                
            %         variable=fread(serial_PSoC,4,'%f');
            %         recepcion_ADC= str2double(variable);

               


                    recepcion_ADC=fscanf(serial_PSoC,'%f');
                    
                    ADC(contador)=recepcion_ADC(1);      
                    figure(1)
                    subplot(2,2,1)
                    plot(ADC,'b');

               

            .......

               

             

               

            In the side of Creator (which is controlled or expected to receive what data is to transmit )

               

                //CyDelay(55);
                        UART_ClearTxBuffer();//clean buffer
                        if(sensor_mux==1)//this work fine
                        {LED_Verde_Write(0);
                            UART_ClearTxBuffer();//clean buffer
                            UART_PutString(volt);//char volt[5]
                            
                            //CyDelay(5);// delay for the bufer (don't work)
                            UART_ClearTxBuffer();//clean buffer
                            LED_Verde_Write(1);
                        }
                        else if(sensor_mux==0)
                        {
                            LED_Verde_Write(0);
                            UART_ClearTxBuffer();//clean buffer
                           UART_PutString(temp);//char temp[5]  
                           
                            //CyDelay(5);// delay for the bufer (don't work)
                            UART_ClearTxBuffer();//clean buffer
                            LED_Verde_Write(1);
                        }

            • 3. Re: Communication between MatLab and PSoC 4, through UART
              JoMe_264151
              JoMe_264151 Dec 30, 2015 6:09 AM (in response to userc_40634)

              It is not a good practice to clear the UART buffers except when there was an error detected.

                 

              PutString() is blocking, so when there is no room in the buffer, the API will wait, interrupts must be enabled.

                 

              It would be easier for us to check your program when you provide us with a complete project, so that we all can have a look at all of your settings? To do so, use
              Creator->File->Create Workspace Bundle (minimal)
              and attach the resulting file.

                 

               

                 

              Bob

              • 4. Re: Communication between MatLab and PSoC 4, through UART
                userc_40634
                userc_40634 Dec 31, 2015 12:38 AM (in response to userc_40634)

                Hi, bob and riot, sorry for delay, I was cleaning my code.
                Here is both (creator and matlab).-

                   

                Happy new Year..!!

                • 5. Re: Communication between MatLab and PSoC 4, through UART
                  JoMe_264151
                  JoMe_264151 Dec 31, 2015 2:45 AM (in response to userc_40634)

                  Your handling of  UART still has a lot of  clear buffers() which only will lead to errors. The buffer is handled by the component when the interrupt is set to "internal" as you did for Tx.

                     

                  Your declarations

                     

                      char volt[1],volt1[1],c[1];

                     

                  only reserve one (1) byte for each variable, but you use them with sprintf() which will overwrite the variables following to your declaration. Increase the size to (more than) the required amount of the expected string.

                     

                   

                     

                  Bob