Getting Odd results: Interfacing PIC18F4550 to Matlab

[burhanmz]

I tried interfacing a simple ADC through 18F4550 to Matlab to implement a certain application, but I ended up with odd results.

A 1k trim pot connected to AN0 on portA in this fashion (Vcc- 1k fixed resistor - 1 k Pot- Ground) the variable terminal of pot to AN0

here is the PIC code ( in simple assembly)

;=========================
; setup and configuration
;=========================
;specify processor, oscillator type external =20MHz, code protection off

	list	 p=18f4550
	#include p18f4550.inc
	

	config FOSC=HS
;	config FOSCS=off
	config wdt=off
	config pwrt=on

;=====================================================
; PIC register equates
R1 EQU 100H
R2 EQU 101H
R3 EQU 102H
;=====================================================

	org 0 		; start at address
	goto main
;			 Space for interrupt handler, change interupt address for other processor
	org 0x08
main

	BCF TRISC,TX
	BSF TRISC,RX


	MOVLW B'00100000'
	MOVWF TXSTA
	MOVLW B'00010000'
	MOVWF RCSTA
	MOVLW B'00000000'
	MOVWF BAUDCON

	BSF TRISA,0

	MOVLW D'2'
	MOVWF SPBRG

	BSF RCSTA,SPEN

	
	MOVLW b'00000001'
	MOVWF ADCON0

	MOVLW b'00001110'
	MOVWF ADCON1

	MOVLW b'00101101'
	MOVWF ADCON2

AGAIN
	CLRF TXREG
	CLRF ADRESH
	BSF ADCON0,DONE

HERE
	BTFSC ADCON0,DONE
	BRA HERE

 	MOVFF ADRESH, TXREG

HERE2 BTFSS PIR1,TXIF
	BRA HERE2

	CALL DELAY
	BRA AGAIN




DELAY
	MOVLW D'10'
	MOVWF R1
D1 	MOVLW D'200'
	MOVWF R2
D2 	MOVLW D'200'
	MOVWF R3
D3	DECF R3,F
	BNZ D3
	DECF R2,F
	BNZ D2
	DECF R1,F
	BNZ D1
	RETURN

;============================================================
	end ; END OF PROGRAM
;============================================================

The Matlab side

a=0;
while a==0
    
SerPIC=serial('COM1');        		%<--change this appropriately
set(SerPIC,'BaudRate', 115200, 'DataBits', 8, 'Parity', 'none','StopBits', 1, 'FlowControl', 'none');              

fopen(SerPIC);  %--open the serial port to the PIC
display('RECEIVED = ');
xyz=fscanf(SerPIC,'%c')  
display('next\n');

fclose(SerPIC)					%--close the serial port when done
delete(SerPIC)				
clear SerPIC
end

the result i get is more than a byte and odd characters.

Can some one please tell me what I did wrong.
I then want to send data from Matlab to PIC and get its out put on port B which would be connected to DAC0808 to a LM358 so that i can measure the appopiate voltage, by changing it in Matlab.