AVR Freaks

Codevision costs €150. If this is for a commercial development surely you just buy a copy then amortize that costs across the number of units you make.

If you do want to "port" the code to GCC with an equivalent of "bit variables" then you can do the usual struct bitfield cast onto GPIOR0 thing to achieve that:

typedef struct {
    int b0:1;
    int b1:1;
    int b2:1;
    int b3:1;
    int b4:1;
    int b5:1;
    int b6:1;
    int b7:1;
} bits_t;

#define bitreg (*(volatile bits_t *)&GPIOR0)

#define switch_var bitreg.b3
#define pump_var bitreg.b5

int main(void) {
    switch_var = 1;
    if (switch_var) {
        pump_var = 0;
    }
}

This yields the code:

0000007a <main>:

#define switch_var bitreg.b3
#define pump_var bitreg.b5

int main(void) {
	switch_var = 1;
  7a:	f3 9a       	sbi	0x1e, 3	; 30
	if (switch_var) {
  7c:	f3 99       	sbic	0x1e, 3	; 30
		pump_var = 0;
  7e:	f5 98       	cbi	0x1e, 5	; 30
	}
}

which would appear to do the trick!

bit <any name>;

with:

#define <any name> bitreg.bN

(N=0..7).

Looking at the Codevision manual it seems that:

so that looks like it automatically allocates N=0, N=1 in order. In my code you have to manually select N=0, N=1 etc. so this manual example would become:

#define alfa bitreg.b0
#define beta bitreg.b1