AVR-Chat

That is not an AVR, but an 8051 device. Maybe someone can help here, but you could perhaps have more success at one of the 8051 lists or forums. 


Jim Wagner 
Oregon Research Electronics 

----- Original Message -----
From: "alex_p_silva" <alex_p_silva@yahoo.com.br> 
To: AVR-Chat@yahoogroups.com 
Sent: Thursday, July 5, 2012 1:30:25 PM 
Subject: [AVR-Chat] help with AT89S52 






Could someone help me I'm trying to make a serial with AT89S52 but they are funny characters and not real (test simulator proteus) 

My code is as follows if anyone can tell what I'm doing wrong, I'm with 12MHz oscillator, I want a baud rate of 9600 even 1 

include <at89x52.h> 

volatile char acceptext; 
volatile __bit status=0; 

void IntSerial()__interrupt 4 __using 1 
{ 
ES=0; 
RI=0; 
status = 1; 
acceptext = SBUF; 
ES=1; 
} 

void inituart(void) // serial port initialization 
{ 
SCON = 0x50; // uart in mode 3 
//PCON = 0x00; 
TMOD = 0X20; // timer 1 in mode2 
TH1 = 0xfd ;// setting baudrate 9600 bps 
//TL1 = 0xfd; 
ES=1 ; // enable serial interrupt 
EA = 1 ; // enable global interrupt 
TR1 = 1 ; // start timer 1 running 
} 

void sendchar(char datasent) // for sending one charater 
{ 
SBUF = datasent; 
while (!TI) 
{;} 
TI = 0; 
} 

void sendtext(char *text) //for sending text 
{ 
char i=0; 
while (text[i]!=0) 
{ 
sendchar(text[i]); 
i++; 
} 
sendchar(13); 
sendchar(10); 
} 

void delay100ms() 
{ 
__asm 
push ACC 
mov a,#149 
L0: 
push ACC 
mov a,#170 
L1: 
nop 
nop 
djnz acc,L1 
nop 
nop 
pop ACC 
djnz acc,L0 
nop 
pop ACC 
__endasm; 
} 

void main(void) 
{ 
inituart(); 
while (1){ 
sendtext("TRIAL 1"); 
P1=0X50; 
P2=0X50; 
delay100ms(); 
P1=0X00; 
P2=0X00; 
delay100ms();} 
} 




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