Problem in displaying a number on char LCD displays

[Arman Ilmak]

Posted on May 01, 2018 at 12:39

Hi.

I was working with my new stm8s105 MCU trying to get started with the timers.

But every time I use the command to display the time on the LCD the same number showed every time.I thought that the problem is my timer code but when I just put a number on the LCD to show it just showed an irrelevant number.

I use the same LCD.h on LPC1768 and STM32F2 and just converted the same header.The only difference is that I used Keil compiler for them and now I'm using IAR.

lcd_gotoxy(1,2);

sprintf(buf,'%d',100);lcd_print(buf);delay_ms(1000);

This is a simple code that must show 100 but it displays 12594

>:(

The characters are displayed properly.The problem is numbers.

[Bogdan Golab]

Posted on May 01, 2018 at 13:34

'buf' variable definition? Is the memory for 'buf' allocated?

For example, you can reserve some memory this way:

char buf[100];

[Bogdan Golab]

Posted on May 01, 2018 at 15:44

Add at the beginning:

#include <string.h>

[Bogdan Golab]

Posted on May 01, 2018 at 16:43

Is the 'HELLO WORLD' correctly displayed in the position of 0,2?

Do yo still see 1,2,... instead of 100?

What messages do you see now?

[Arman Ilmak]

Posted on May 01, 2018 at 15:37

Yeah, the LCD is 2*16 and this is the code.

[Arman Ilmak]

Posted on May 01, 2018 at 16:23

Did it.But no result.

[Bogdan Golab · Accepted solution]

Posted on May 01, 2018 at 16:48

The last questions refers to compiler messages like the one you show earlier (spriinf() declared implicitely , etc)

[Bogdan Golab]

Posted on May 01, 2018 at 19:15

>On my LCD or in the message box of the compiler?

In the compile window

[Bogdan Golab]

Posted on May 01, 2018 at 19:40

I was wrong - the sprintf is a part of:

#include <

https://pl.wikibooks.org/wiki/C/Biblioteka_standardowa/Indeks_tematyczny#stdio.h

>So include the stdio.h as shown above to clear the message and test it again.

[Arman Ilmak]

Posted on May 01, 2018 at 19:13

Bogdan Golab wrote:

Is the 'HELLO WORLD' correctly displayed in the position of 0,2?

Yes, it's ok and in its proper position.

Bogdan Golab wrote:

Do yo still see 1,2,... instead of 100?

I just see 18501 instead of 100 at first, then after 30 seconds, I see 12594. 

What messages do you see now?

On my LCD or in the message box of the compiler?