serial port communication using rs232

[akshay985]

i m doing serial port communication using 89s52 i m sending and recieving bytes of data but the data sent only the first byte is recieved and remaining are not recieved.View attachment rs232 com.txt

 

[Noman Yousaf]

hi akshay your sent txt file is not good. send it again. one more thing the problem u r facing may be due to high speed comunication. make a delay between bytes send and where do u save the recieved byte? that should b in RAM. and have to b transfered to next ram address.

Don't use SMS typing. Write the compete words [alexan_e]

 

[alexan_e]

His text file content are fine (I mean that the content can be viewed fine, I have no idea if the code is correct).
This in the content of the original poster attachment file:

#include<REG51.H>
#include<stdio.h>
#include<string.h>

unsigned char data_upper,data_lower,data_convert_lower,data_convert_upper;
void delay_1ms(unsigned int);

void lcdcmd(unsigned char);

void serial_init();		 //initialise rs232 communication with com1
void lcddata();
sbit enable = P3^6 ;
sbit rs = P3^7;
unsigned char data_sent;
unsigned char port_data;
//     enable equ P2^0;
void main()
{
    P0=0xFF;
    //  P2=0xFF;
    P1=0xFF;
    /*	  lcdcmd(0x38);
    //	  delay_1ms(5);
    	  lcdcmd(0x0F);
    //	  delay_1ms(2);
    	  lcdcmd(0x80);
    //	  delay_1ms(2);
    	   lcdcmd(0x06);	*/
    serial_init();		  //serial port initialiase

    while(1) {

        //   	P1=P2;

        port_data=~P2;		//read data from port2 and send to serial port
        data_lower = port_data & 0x0F;
        data_convert_lower = data_lower | 0x30; //convert to hex code 0x30 to 0x39 for digits
        data_sent = data_convert_lower;
        P1= data_sent;
        /*
          data_upper = port_data & 0xF0;
        data_upper = data_upper >> 4;
        data_convert_upper = data_upper | 0x30;
        data_convert_upper = data_convert_upper << 4;
        data_sent = data_convert_upper | data_convert_lower;
        */
        SBUF=~data_sent;	// send hex data to serial buffer
        //	delay();

        //     lcddata();
        // lcddata();
        while(TI==0);
        TI=0;

    }
}

void serial_init()
{
    TMOD = 0x20;		  // 0x20 for serial data transmit mode
    TH1=0xFD;			  // set baud rate to 9600
    SCON=0x50;
    TR1=1;
    TI=0;

}

void lcdcmd(unsigned char cmd)
{
    P0=cmd;
    rs=0;
    enable=1;
    delay_1ms(1);
    enable=0;
}

void lcddata()
{
    unsigned char var1;

    P0=data_sent;
    rs=1;
    enable=1;
    delay_1ms(5);
    enable=0;

}

void delay_1ms(unsigned int x)
{
    unsigned char i;
    for(i=0; i<=x; i++)
    {
        TMOD=0x01;
        TL0=0xAA;
        TH0=0xFF;
        TR0=1;
        while(TF0==0);
        TF0=0;
        TR0=0;
    }
}

Alex

 

[dimas_lilik]

Hi Alex : did you have in assembler code?

 

[alexan_e]

All I did was to post the content of the text file that the original poster has attached, this is not my code, I have never used this mcu.

Alex