/* PCF8574 Address */
#define PCF_ADR		0x40	            // Address of PCF8574

/* PCF8574 Read/Write */
#define PCF_READ	0x01				// Sets read bit
#define PCF_WRITE	0x00				// Sets write bit

/* PCF8574 Pin Defines */
#define PCF0		0					// PCF In/Out 0
#define PCF1		1					// PCF In/Out 1
#define PCF2		2					// PCF In/Out 2
#define PCF3		3					// PCF In/Out 3
#define PCF4		4					// PCF In/Out 4
#define PCF5		5					// PCF In/Out 5
#define PCF6		6					// PCF In/Out 6
#define PCF7		7					// PCF In/Out 7

/* Functions */
uint8_t pcf_start(uint8_t address) {
	// Send start condition
	if(i2c_start(address | PCF_ADR))
		return 1;
	else
		return 0;
}

void pcf_stop(void) {
	i2c_stop();
}

uint8_t pcf_write(uint8_t data) {
	if(i2c_write(data))
		return 1;
	else
		return 0;
}
uint8_t pcf_write_oc(uint8_t data) {
	if(i2c_write(~data))
		return 1;
	else
		return 0;
}