struct

Marc · Guest

I have 4 flags:

int1 flag1
int1 flag2
int1 flag3
int1 flag4

I put them into a struct

struct {
int1 flag1
int1 flag2
int1 flag3
int1 flag4 } all_flags

It is possible to do:
all_flags=0110

instead of:

all_flags.flag2=1;
all_flags.flag3=1;

Thank you

Ttelmah · Guest

Put them in a union.
This is exactly what a union is for:

Marc · Guest

I can't understand. My question is: is it possible to build a variable with four bits, that is to say not a byte variable but a nibble variable or a three bits variable?

Thank You

libor · Joined: 14 Dec 2004 Posts: 288 Location: Hungary

Try this:

rnielsen · Joined: 23 Sep 2003 Posts: 852 Location: Utah

The 12F, 16F & 18F series PICs are eight bit devices. You cannot declare a variable to be a 4-bit variable. The declaration 'int1' will take one bit, from an 8-bit byte. 'int8' will use the whole byte. 'int16' will use two bytes to make one variable. If you only want to manipulate four bits then you can declare the variable as 'int8' and then only use four of the bits. Masking the variable with something like 0x0F will ensure that nothing is stored into the four higher bits and, when read, nothing is in the four higher bits of the variable you're working with.

Clear as mud?

Ronald