send data or char 4m hyperterminal to lcd using 89c51

jayanth.devarayanadurga said:

Post code. Try this code. It will echo back the sent characters. If you send A then you will receive another A in RealTerm.

Click to expand...

i didnot get A in real term as well as in LCD

Did you check the half duplex? If it still doesn't work then your MAX232 circuit is damaged.

Try putting the uart receive code in interrupt routine.

jayanth.devarayanadurga said:

Did you check the half duplex? If it still doesn't work then your MAX232 circuit is damaged.

Try putting the uart receive code in interrupt routine.

Click to expand...

can u tell me how can i check my PC serial port in working correct or wrong?

jayanth.devarayanadurga said:

Did you check the half duplex? If it still doesn't work then your MAX232 circuit is damaged.

Try putting the uart receive code in interrupt routine.

Click to expand...

thank you very very much jay for helping me
i got output on LCD but there is only one line i can see one LCD .
it should possible if i write more then one line and that is going to be display on lcd and automatically that LCD cursor will take next line ,and i can write unlimited char/word/sententious on lcd

After you write first line on lcd then you have to send lcd command 0xC0 so that next data is printed on line 2 and if you want to print again then clear the display and give lcd command 0x80 for first line and then it prints on line 1.

jayanth.devarayanadurga said:

After you write first line on lcd then you have to send lcd command 0xC0 so that next data is printed on line 2 and if you want to print again then clear the display and give lcd command 0x80 for first line and then it prints on line 1.

Click to expand...

that oxco can i directly give from hyperterminal or have add in main program?
and i got two world at a time.thats mean if i write in hyperterminal ronak then lcd is showing ronak#ronak .

Send some code like '1' and '2' from PC to MCU and write code such that if '1' is received 0x80 cmd is sent to lcd and if '2' is received 0xc0 cmd is sent to lcd.

jayanth.devarayanadurga said:

Send some code like '1' and '2' from PC to MCU and write code such that if '1' is received 0x80 cmd is sent to lcd and if '2' is received 0xc0 cmd is sent to lcd.

Click to expand...

hi jay
how can give next command to lcd for see next line/char in lcd

if mcu receives '1' then lcd_cmd(0x80) is called and when mcu receives '2' lcd_cmd(0xC0) is called.

jayanth.devarayanadurga said:

if mcu receives '1' then lcd_cmd(0x80) is called and when mcu receives '2' lcd_cmd(0xC0) is called.

Click to expand...

but i have confusion where that code will be add in program.plz tell me
bcz i didnot get completely my .text file on lcd why?

Post your latest code. I will answer tomorrow.

jayanth.devarayanadurga said:

Post your latest code. I will answer tomorrow.

Click to expand...

#include <REGX51.H>
sbit rs= P3^5;
sbit rw= P2^1;
sbit en= P3^4;
////////////////////////////////////Delay////////////////////////////////////
void mdelay(unsigned int itime)
{
unsigned int i,j;
for(i=0;i<itime;i++)
for(j=0;j<1275;j++);
}
/// / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / L C D COMMAND////////////////////////////////////
void lcdcmd(unsigned char value)
{
P1=value;
rs=0;
rw=0;
en=1;
mdelay(1);
en=0;
}
void lcd_data(unsigned char value)
{

P1=value;
rs=1;
rw=0;
en=1;
mdelay(1);
en=0;
}
/////////////////////////////////STRING LCD////////////////////////////////
void string_lcd(unsigned char *ptr)
{
unsigned int h,j=0;
while(*ptr)
{
h++;
if(h<15)
{
lcd_data(*ptr++);
}
if(h>=15)
{

lcdcmd(0xC0+j);
lcd_data(*ptr++);
j++;
}
//mdelay(250);
//lcdcmd(0x18);
}
// *(ptr++);
}

//INITIALIZATION///////////////////////////////
void uart_init()
{
TMOD=0x20;
TH1=0xFD;
SCON=0x50;
TR1=1;
}
/// / / / / / / / / / / / / / / / / / / / / / / / / / / / / L C D INITIALIZATION//////////////////////////////
void lcd_init()
{
lcdcmd(0x38);
//mdelay(250);
lcdcmd(0x0F);
//mdelay(250);
lcdcmd(0x01);
//mdelay(250);
lcdcmd(0x06);

} //mdelay(250);

void main()
{

unsigned char str2[100],*ptr;
unsigned int i;
ptr=str2;
uart_init();
lcd_init();

while(SBUF!=0x0D) //Checking if the enter is pressed or not
{
while(RI==0);
RI=0;
str2=SBUF;
i++;
}
str2='\0';
string_lcd(ptr);
// To display on LCD
for(i=0;i<6;i++)
{
lcd_data(str2);
}
while(1);
}

where is the code which checks if 16 characters are received and the code which checks if lcd line1 or line 2 has to be selected?

jayanth.devarayanadurga said:

where is the code which checks if 16 characters are received and the code which checks if lcd line1 or line 2 has to be selected?

Click to expand...

but i have confusion where that code will be add in program.
and i was add here some code if(h<15)
{
lcd_data(*ptr++);
}
if(h>=15)
{

lcdcmd(0xC0+j);
lcd_data(*ptr++);
j++;

where is the code to return to line 1 when line 2 is filled?

jayanth.devarayanadurga said:

where is the code to return to line 1 when line 2 is filled?

Click to expand...

sorry jay i can't understand where and which code will write ?

You are checking if h>=15. also add if h >=31 lcd_cmd(0x80)

jayanth.devarayanadurga said:

You are checking if h>=15. also add if h >=31 lcd_cmd(0x80)

Click to expand...

i was added this code but rightnow that another data didn't sow on lcd
h++;
if(h<15)
{
lcd_data(*ptr++);
}
if(h>=15)
{

lcdcmd(0xC0+j);
lcd_data(*ptr++);
j++;
}
if(h>=31)
{
lcdcmd(0x80);
lcd_data(*ptr++);
}

I see that you use j to increment the character position. You have done that for line 2 but not for line 1. when H is >= 31 then j should be set 0 and use lcd_cmd(0x80+j) and j++;

see if your lcd_cmd() function auto increments the position of character.

jayanth.devarayanadurga said:

I see that you use j to increment the character position. You have done that for line 2 but not for line 1. when H is >= 31 then j should be set 0 and use lcd_cmd(0x80+j) and j++;

see if your lcd_cmd() function auto increments the position of character.

Click to expand...

i was also try with this code void string_lcd(unsigned char *ptr)
{
unsigned int h,j=0;
while(*ptr)
{
h++;
if(h<15)
{
lcd_data(*ptr++);
}
if(h>=15 && h<=31)
{

lcdcmd(0xC0+j);
lcd_data(*ptr++);
j++;

}
if(h>31 && h<47)
{
mdelay(300);
lcdcmd(0x01);
lcd_data(*ptr++);
}
if(h>=47)
{
lcdcmd(0xC0+j);
lcd_data(*ptr++);
j++;
}
//mdelay(250);
//lcdcmd(0x18);
}
but i didn't get output.
here i can see 32 char is 100% clear but after 32char there is overwriting will be started.