key handling

[karmon]

so because, from what i've seen from the tutorials on this site, all psp programs have to be looped, this causes some problems with key handling.
for example, lets say i have some code, where hitting x increments the value of something variable by 1.

char str[10];
int variable=0;

while(1)
{
    sprintf(str, "%d", variable);
    printTextScreen(3, 3, str, RGB(255, 255, 255));

    sceCtrlReadBufferPositive(&pad, 1);
        if(pad.Buttons & PSP_CTRL_CROSS) {
           variable++;
        }
        flipScreen()
}

something along those lines.
because the program is constantly looped, hitting cross once will increment the value of variable by say...4, depending on how long it takes you to press down cross and release.

how can i prevent this from happening?

[Zettablade]

Originally Posted by karmon

so because, from what i've seen from the tutorials on this site, all psp programs have to be looped, this causes some problems with key handling.
for example, lets say i have some code, where hitting x increments the value of something variable by 1.

char str[10];
int variable=0;

while(1)
{
    sprintf(str, "%d", variable);
    printTextScreen(3, 3, str, RGB(255, 255, 255));

    sceCtrlReadBufferPositive(&pad, 1);
        if(pad.Buttons & PSP_CTRL_CROSS) {
           variable++;
        }
        flipScreen()
}

something along those lines.
because the program is constantly looped, hitting cross once will increment the value of variable by say...4, depending on how long it takes you to press down cross and release.

how can i prevent this from happening?

doing that whole oldpad thingy.

[karmon]

hmmm...do you think you could explain that?

[youresam]

You save the pad varaible to another variable (such as oldpad), then you say if pad and NOT oldpad (forgot the C syntax )

[karmon]

i'm sorry, i'm really new to programming for the psp, as you can probably see, is there any way i could get an exmaple of how this is done?

[Zettablade]

Sure.

char str[10];
int variable=0;

while(1)
{
unsigned int paddata_old = 0;
SceCtrlData paddata;
    sprintf(str, "%d", variable);
    printTextScreen(3, 3, str, RGB(255, 255, 255));

    sceCtrlReadBufferPositive(&pad, 1);
if(paddata.Buttons != paddata_old){
if(paddata.Buttons & PSP_CTRL_CROSS) variable++;
}
        flipScreen()
}

[karmon]

sweet, thanks a lot.

nevermind, i got it to work.

[Art]

Or you could use a button debounce routine so the program doesn't even look at the buttons again for X amount of time.
Some programs might require use of the same button twice in a row.

[Sturmeh]

The best way is to make it set a value to one everytime a key is pressed, and dont allow checking for key until the key has been released, which will declare the same variable as 0 again, which will allow the key to be input again.

But listen to these guys, my idea's prolly oldschool.