BTG equivalent in C18?

blueroomelectronics

Well-Known Member

• Feb 12, 2009

• #1

What is the C18 equivalent to the assembly instruction BTG (Bit toggle)?

 

futz

Active Member

• Feb 12, 2009

• #2

blueroomelectronics said:

What is the C18 equivalent to the assembly instruction BTG (Bit toggle)?

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Exclusive OR (^) with a mask of your target bit/byte/word/whatever.

I don't have a PIC example handy, but here's an ARM sample. The code is used to toggle two bits for a piezo beeper to drive it antiphase.

Code:

        IOPIN0 ^= 0x00003000;

 

Last edited: Feb 12, 2009

P

Pommie

Well-Known Member

Most Helpful Member

• Feb 12, 2009

• #3

Both,
LATBbits.LATB7=!LATBbits.LATB7;
and
LATB^=128;
compile to a BTG.

Edit,
Rather shockingly,
LATB=LATB^128;
results in 3 instruction. And that is with full optimization.

Mike.

 

Last edited: Feb 12, 2009

blueroomelectronics

Well-Known Member

• Feb 19, 2009

• #4

Thanks guys, starting to get the hang of C18, C30.