matlab-arduino serial communication

hi, i have these code in matlab. this code allow send data for turn on and off some leds in a given sequence:

    %Comunicación serial Arduino-MatLab
    delete(a);
    clear all;
    close all;
    a = serial('COM3','BaudRate',9600);
    fopen(a);
    b = [100;200;300;400];
    c = [200;300;400;100];
    d = [300;400;100;200];
    e = [400;100;200;300];
    k = size(b);

    bs = num2str(b);
    cs = num2str(c);
    ds = num2str(d);
    es = num2str(e);
    for i = 1:  k(1)
        send(i,1:12) = strcat(bs(i,1:3),cs(i,1:3),ds(i,1:3),es(i,1:3));
    end
    sis = size(send);
    sendt = send';
    for i = 1: sis(1)*sis(2)
        sendr(i) = sendt(i);    
    end
    fwrite(a,sendr)

the arduno code is that:

//Comunicación serial MatLab-Arduino

int incomingbyte[4][3]; //matriz de datos (byte) leidos

/*Declaramos las variables correspondientes a los pines que
encenderán o apagarán a medida que llegan las instrucciones*/

int LedPin13 = 13; //Pin 13 donde el LEDse apagará o encenderá dependiendo de los dattos recibidos
int LedPin10 = 10;
int LedPin7 = 7;
int LedPin3 = 4;

void setup()
{
  Serial.begin(9600); //abrir puerto serial y estblecer la velocidad en baudios (bps)
  //abrimos los pines como puertos de salida//
  pinMode(LedPin13, OUTPUT);
  pinMode(LedPin10, OUTPUT);
  pinMode(LedPin7, OUTPUT);
  pinMode(LedPin3, OUTPUT);
}

void loop()
{
  if(Serial.available() > 0)
  {
    int i;
    int j;
    for(i = 0; i < 4; i = i + 1)
    {
      for(j = 0; j < 3; j = j + 1)
      {
        incomingbyte[i][j] = Serial.read();   // lee el byte entrante
        Serial.println(incomingbyte[i][j]);

        }
      }
      int tiempo[4];
      int g;
      for(g = 0; g < 4; g = g + 1)
      {
        tiempo[g] = (incomingbyte[g][0] - 48)*100 + (incomingbyte[g][1] - 48)*10 + (incomingbyte[g][2] - 48);
        Serial.println(tiempo[g]);
      }

      digitalWrite(LedPin13, HIGH);//encender el LED
      delay(tiempo[0]*10);
      digitalWrite(LedPin13, LOW);//apagar el LED
      digitalWrite(LedPin10, HIGH);
      delay(tiempo[1]*10);
      digitalWrite(LedPin10, LOW);
      digitalWrite(LedPin7, HIGH);
      delay(tiempo[2]*10);
      digitalWrite(LedPin7, LOW);
      digitalWrite(LedPin3, HIGH);
      delay(tiempo[3]*10);
      digitalWrite(LedPin3, LOW);
    }
  }

my problem is that matlab cant send the sendr matrix from the script but in command windows i write the same last line ("fwrite(a,sendr)") then it can run successfully.

thanks a lot for the aid.

[Walter Roberson]

Whatever you are doing looks overly complicated...

Answer 1

[Walter Roberson]

The entire MATLAB part of the program after the fopen() can be replaced by

fprintf(a, '%3d',b,c,d,e);

However, in the general case that does not match the input expected by the C program you show, as the code you have also does not match the input expected. To repair, instead use

fprintf(a, '%03d',b,c,d,e);

so that values that happen to be less than 100 have leading 0s put in. (Your existing code would generate spaces in that case, but spaces are not expected by the C code.)

Answer 2

[navin gopaul]

I got here looking for an answer. solves my problem, thanks.