Bit toggling a variable

[MikeW]

I have spent an hour trying to sort this out, and failed.

I am trying to toggle a bit in a variable.

I define a flag

int16 General_Flags1;
then define the bit
#define T_1Sec_Toggle_Flag T_Timer_Flags,15

so, i think that bit 15 of General_Flags1 holds my boolean

I now wish to toggle that bit by using something like :-


#define bit_toggle(my_bit) {#asm btg my_bit #endasm}

of course, this only works for a byte, so i get an error saying it can only be 0..7, not 15

can some guru help ?

is there a better way.

Basically, I am looking for a function like output_toggle(pin), which works with a variable of more than 8bits, rather than a pin.

Mike

[Mark]

The PIC is an 8 bit machine and thus only 0-7 is allowed. What you must do is use bit 7 of the upper byte. For CCS this is &myvar + 1 when using assembly. Another option would be to use a struct to define the bits and then just do a myvar.bit15 = !myvar.bit15;

[Neutone]

This is not a function but it is easy to read.

[MikeW]

looks good to me, many thanks

MikeW