Function editor

Hello,

I'm currently using uVision 2.33. I've written the following function in the function editor to simulate an RC5 signal which I want to detect on P1.1:

define button "Start P1.1 Toggle", "p11_toggle()"
define button "Stop P1.1 Toggle" , "signal kill p11_toggle"

signal void Generate0()
{
    P1 &= ~0x02; /* pull T2EX(P1.1) low and generate interrupt */
    twatch( 889 );
    P1 |= 0x02;  /* pull T2EX(P1.1) high */
    twatch (889);
}

signal void Generate1()
{
    P1 |= 0x02;  /* pull T2EX(P1.1) high */
    twatch( 889 );
    P1 &= ~0x02; /* pull T2EX(P1.1) low and generate interrupt */
    twatch (889);
}

signal void p11_toggle()
{
    while (1)
    {
        // Bit1: start
        Generate1();
        // Bit2: indication
        Generate1();
        // Bit3: toggle
        Generate0();
        // Bit4: system5
        Generate0();
        // Bit5: system4
        Generate0();
        // Bit6: system3
        Generate0();
        // Bit7: system2
        Generate0();
        // Bit8: system1
        Generate1();
        // Bit9: command6
        Generate1();
        // Bit10: command5
        Generate0();
        // Bit11: command4
        Generate0();
        // Bit12: command3
        Generate0();
        // Bit13: command2
        Generate1();
        // Bit14: command1
        Generate0();
        swatch( 1 );
    }
}

If I compile this script, I don't get a compilation or warning from the function editor.

However, when I run my program and activate the toggling functionality on P1.1 via the button "Start P1.1 Toggle", I get the following error message:

*** function 'p11_toggle', error 99, line 27: signal() already activated
p11_toggle()
*** error 99: signal() already activated

I know that the functions Generate1() and Generate0() are called more than once without first killing and then re-calling them, but what is the alternative? How can I 'call' more than once the same function from within another function?

Also, when I put the funcions Generate1() and Generate0() at the end of the script, the compiler doesn't complain, but when I load this script, I get the following error:

*** error 34, line 9: undefined identifier

Why does the script compiler not inform me about this 'mistake'?

Rgds,

--Geert