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#ifndef IO_EXTENDER_H_
#define IO_EXTENDER_H_
#include "pcf8574.h"
#include "util.h"
enum ioext_bits {
EXTOUT_VALVE0,
EXTOUT_VALVE1,
EXTOUT_VALVE2,
EXTOUT_VALVE3,
EXTOUT_VALVE4,
EXTOUT_VALVE5,
};
#define EXTOUT_NR_CHIPS 1
struct ioext_context {
struct pcf8574_chip chips[EXTOUT_NR_CHIPS];
uint8_t old_states[EXTOUT_NR_CHIPS];
uint8_t states[EXTOUT_NR_CHIPS];
};
extern struct ioext_context ioext_ctx;
static inline bool ioext_bit_is_set(uint8_t bit_number)
{
uint8_t chip = bit_number / 8;
uint8_t bit = bit_number % 8;
return (ioext_ctx.states[chip] >> bit) & 1;
}
static inline bool ioext_bit_is_clear(uint8_t bit_number)
{
return !ioext_bit_is_set(bit_number);
}
static inline void ioext_set_bit(uint8_t bit_number)
{
uint8_t chip = bit_number / 8;
uint8_t bit = bit_number % 8;
ioext_ctx.states[chip] |= BITMASK8(bit);
}
static inline void ioext_clear_bit(uint8_t bit_number)
{
uint8_t chip = bit_number / 8;
uint8_t bit = bit_number % 8;
ioext_ctx.states[chip] &= ~BITMASK8(bit);
}
static inline void ioext_write_bit(uint8_t bit_number, bool set)
{
if (set)
ioext_set_bit(bit_number);
else
ioext_clear_bit(bit_number);
}
void ioext_commit(void);
void ioext_init(bool all_ones);
#endif /* IO_EXTENDER_H_ */
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