Problem SWITCH-command.

[jjude]

This is not absolute my code, but example my problem.
This code not work very good. If data change, code not run new "case".
I use fast_io. Data input B3-B0-pin.
----------------------------------------------------
void main()
{
.
.
.
data=input_b()&0x0f;
while(data != 0) //
{
data=input_b()&0x0f;
switch (data)
{
case 0b1101:
{
.
.

data_new=data;
x_minus();
break;
}
case 0b1011:
{
.
.
data_new=data;
x_plus();
break;
}
case 0b0111: // Eteen, ei kaasua
{
.
.
break;
}
case 0b1111:
{
.
.
break;
}
}
}
}
---------------------------------------------
But if i add delay, code work but slow.
.
.
data=input_b()&0x0f;
delay_ms(1000); // I add this.
switch (data)
.
.

------------------------------------------------------
void x_minus()
{
output_high(PIN_B6);
output_low(PIN_B5);
while((input(PIN_A7) == 1) && (data == data_new))
{
pulse();
}
output_low(PIN_B6);
return;
}
------------------------------------------------------
void pulse()
{
y=50000/x;
output_high(PIN_A2);
delay_us(viive);
output_low(PIN_A2);
delay_us(viive);
output_high(PIN_A2);
delay_us(viive);
output_low(PIN_A2);
delay_us(viive);
output_high(PIN_A2);
delay_us(viive);
output_low(PIN_A2);
data_new=input_b()&0x0f;
return;
}
------------------------------------------------------

[ckielstra]

What is connected to your data input pins B0-B3? Are these (keyboard) switches?
If yes, then that's your problem. Switches can bounce (open and close) for as long as 20ms before reaching a stable new state, that's why you need debouncing hardware or software routines. More good info can be found in the thread http://www.ccsinfo.com/forum/viewtopic.php?t=32166.
In case you have a keyboard matrix connected a debounce function is provided in the file KBD.C in the driver directory of your CCS compiler.