Use Matlab to read serial data

 

Matlab is one big tool which you can play with.. Matlab can be configured to read serial data that can be send through a microcontroller. Here is the code for Matlab to read a single line and print. Assume that you are sending ascii character values through microcontroller separated by new line.

Here is the Matlab code to receive the data.

   1: obj1 = instrfind('Type', 'serial', 'Port', 'COM13', 'Tag', '');

   2: % Create the serial port object if it does not exist

   3: % otherwise use the object that was found.

   4: if isempty(obj1)

   5: obj1 = serial('COM13');

   6: else

   7: fclose(obj1);

   8: obj1 = obj1(1)

   9: end

  10: obj1.BaudRate=4800;

  11: set(obj1, 'Parity', 'even');

  12: set(obj1, 'StopBits', 2.0);

  13: fopen(obj1);

  14: data1=fscanf(obj1, '%s');

  15: data1=fscanf(obj1, '%s'); %Assume that you are sending characters and 8 bit binary no.s

  16: data1;                    %Use a=fread(obj1); if it's not charecter

  17: fclose(obj1);

  18: delete(obj1);  

  19: clear obj1;

 

Here is the code for AVR Microcontroller to send ‘1024’ through serial port.

 

   1: /*

   2:  * Ploting_ADC_Values.c

   3:  *

   4:  * Created: 22-10-2013 09:44:54

   5:  *  Author: ANANTHAKRISHNAN U S

   6:  */ 

   7:  

   8:  

   9:  

  10: #define F_CPU 1000000UL

  11: #define FOSC 1000000 

  12: #define BAUD 4800

  13: #define MYUBRR FOSC/16/BAUD-1

  14:  

  15: #include <avr/io.h>

  16: #include <util/delay.h>

  17: #include <stdio.h>

  18:  

  19: static int uart_putchar(char c, FILE *stream);

  20: static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL,_FDEV_SETUP_WRITE);

  21:  

  22:                                              

  23: void USART_Init( unsigned int ubrr);

  24: static int uart_putchar(char c, FILE *stream);

  25: char uart_getchar(FILE *stream);

  26:  

  27: int main(void)

  28: {

  29:     USART_Init(MYUBRR);                  //Initializing USART

  30:     stdout = &mystdout;

  31:     int i =1024;

  32:     while(1)

  33:     {

  34:         printf("%d\n",i);

  35:         _delay_ms(50);

  36:     }

  37: }

  38:  

  39: void USART_Init( unsigned int ubrr)

  40: {

  41:     /*Set baud rate */

  42:     UBRR0H = (unsigned char)(ubrr>>8);

  43:     UBRR0L = (unsigned char)ubrr;

  44:     //Enable receiver and transmitter */

  45:     UCSR0B = (1<<TXEN0) | (1<<RXEN0);

  46:     /* Set frame format: 8data, 2stop bit */

  47:     UCSR0C = (1<<USBS0)|(3<<UCSZ00)|(1<<UPM01);//Asynchronous 8bit data Even parity 2 stop bit

  48: }

  49:  

  50: static int uart_putchar(char c, FILE *stream)

  51: {

  52:      if (c == '\n') {

  53:         uart_putchar('\r', stream);

  54:     }

  55:    // Wait for empty transmit buffer */

  56:    while ((UCSR0A & (1 << UDRE0)) == 0) {};

  57:    // Put data into buffer, sends the data */

  58:    UDR0 = c;

  59: }

  60:  

  61:  

  62: char uart_getchar(FILE *stream) {

  63:     

  64:     while ((UCSR0A & (1 << RXC0)) == 0) {};

  65:      /* Wait until data exists. */

  66:     return UDR0;

  67: }