[SOLVED] Send data from Matlab to 8051 using proteus simulation.

[kishore680]

oh thanks a lot!! Btw how did u send data serially? That code u ran once.?. i ll be typing everytime in command window.So asked. I see you didnt use that serial port emulator?

 

[jayanth.devarayanadurga]

I sent "hello" from code. I didn't send it through VT or matlab or COM port. If you want to send data to mcu you can send it from VT.

 

[kishore680]

Oh ya max232 output will be inverted.So if i have to send data serially from matlab.Say HELLO from matlab.. Does the max232 connection change? Like T1In should be given to COMPIM txd?..should i have to send ascii values from matlab?...What are the changes

 

[jayanth.devarayanadurga]

Just send inverted data from matlab and see. Yes. You have to send ascii inverted data from matlab.

 

[kishore680]

No i tried..IF i send from matlab.. i get data only from COMPIM . Not after max232. I am missing Something.. Should i send 0x41 for A in matlab to display the value ?

 

[kishore680]

Hey i have sent ABCDE serially from microcontroller. But receiving some unknown characters in hyperterminal.Baudrate,parity,stop bits all are configured properly in hyperterminal as well as COMPIM.. ANd even 8051 has 9600 baudrate..

 

[jayanth.devarayanadurga]

Post you code and circuit.

 

[kishore680]

I have attached code.Hyperterminal will be start->prog->accessories--> communciations->Hyperterminal in windows!. Getting wierd characters but data is being sent i guess.Please connect TXD AND RXD pins of compim to the max232 if i left

 

[kishore680]

I even tried using PIC, https://saeedsolutions.blogspot.in/2012/05/interfacing-with-uart-of-pic.html . I get Hello world if i just connect TXD RXD pin of Pic to COMPIM. But if i introduce max232 .Then output at hyperterminal is wierd!

 

[zuisti]

Do not use MAX232 in Proteus, in conjunction with the COMPIM. It uses digital ('TTL') levels like the Virtual Terminal, while transforms the phisical port to a virtual port.

 

[jayanth.devarayanadurga]

MAX232 inverts the data.

 

[kishore680]

How to display proper data then in hyperterminal!

 

[jayanth.devarayanadurga]

Are you sending data from Proteus to Hyperterminal?

 

[kishore680]

yes. In proteus only.The hello world is in code itself.that i m sending to hyperterminal.Simulating in proteus

 

[jayanth.devarayanadurga]

Try to remove MAX232 in Proteus and Connect Tx and Rx of MCU to COMPIM directly and see.

 

[kishore680]

That works without max232 .But i want to implement it in real world too.So max232 shud be der rite?,

 

[anasfuad33eng]

Hi i have written small matlab code

s = serial('COM4','BaudRate',9600);
 fopen(s);
 fprintf(s,'A');

My circuit in proteus View attachment 87800.. IF i send higood. i got this as output in virtual terminal View attachment 87801. And the keil code for receiving data serially is

#include<reg51.h>
void sertex(unsigned char);
void main(void)
   {							  unsigned char z;
						   TMOD=0x20;
						   TH1=0xFD;
						   SCON=0x50;
						   TR1=1;
				 		  
						   
			while(1)
{

while(RI==0);
z=SBUF;
P1=z;
RI=0;


}
}

. Please someone tell me whats the fault in circuit or in programme.I need to send data from PC and make sure microcontroller received it properly.Thanku

hi, fprintf instruction send text not binary data check fwrite instruction

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Hi i have written small matlab code

s = serial('COM4','BaudRate',9600);
 fopen(s);
 fprintf(s,'A');

My circuit in proteus View attachment 87800.. IF i send higood. i got this as output in virtual terminal View attachment 87801. And the keil code for receiving data serially is

#include<reg51.h>
void sertex(unsigned char);
void main(void)
   {							  unsigned char z;
						   TMOD=0x20;
						   TH1=0xFD;
						   SCON=0x50;
						   TR1=1;
				 		  
						   
			while(1)
{

while(RI==0);
z=SBUF;
P1=z;
RI=0;


}
}

. Please someone tell me whats the fault in circuit or in programme.I need to send data from PC and make sure microcontroller received it properly.Thanku

hi, fprintf instruction send text not binary data check fwrite instruction

 

[kishore680]

This circuit worked!!! I just added two inverters in between max232 and compim!