http://wyoos.org - Write Your Own Operating System

[Mixony]

got to around 40 minutes in episoed 14 and when I run it I get blue screen drawn and then this

rLmvbor.png (1.82 KiB) Viewed 777 times

Has anyone had this issue before and does anyone know how to solve this.
If code is needed just ask.

[algorithman]

If I remember correctly, you have told me on IRC that it was a problem with signed int <-vs-> unsigned int. Is that right?

[Mixony]

Posted this and it said wait for the moderator to allow or something like that and like hour after I found I put wrong type. uint8_t instead int8_t.
Thanks anyways.

[algorithman]

Okay, good
so you used int8_t in a loop that looped while the number was smaller than some X (something between 128 and 255) and that is always true for signed int8_t
so the loop never terminated and the screen was never actually drawn (or only the first row or something), right?

[algorithman]

Maybe you had an integer overflow and (because of negative coordinates) have "drawn" outside the screen and corrupted some memory that belongs to the VGA adapter or so...

[Mixony]

I did
for(uint8_t i=numChildren-1; i>=0;--i)
{

children[i] -> Draw(gc);

}

instead of
for(int8_t i=numChildren-1; i>=0;--i)
{

children[i] -> Draw(gc);

}

so it was always greater or equal to 0 and became infinite loop

[algorithman]

I have made such mistakes also
Thanks for sharing (might help someone else out )