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Use Matlab to read serial data

 

Matlab is one big tool which you can play with.. Smile 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: }

 

 
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