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 *
 * \brief PCF8574 i2c port expander driver.
 *
 * This driver controls the PCF8574.
 * The PCF8574 is an 8bit i2c port expander.
 * You can read/write 8 pins through an i2c bus.
 * The pins are quasi-bidirectionals, this mean that
 * without the need of a direction register you can use
 * each pin as input or output, see datasheet on how this
 * is achieved.
 *
 * \author Francesco Sacchi <batt@develer.com>
 */

#include "pcf8574.h"

#include "cfg/cfg_i2c.h"

#include <cfg/module.h>

#include <drv/i2c.h>

/**
 * Read PCF8574 \a pcf bit status.
 * \return the pins status or EOF on errors.
 */
int pcf8574_get_2(I2c *i2c, Pcf8574 *pcf)
{
	i2c_start_r(i2c, PCF8574ID | ((pcf->addr << 1) & 0xF7), 1, I2C_STOP);

	int data = i2c_getc(i2c);

	if (i2c_error(i2c))
		data = EOF;

	return data;
}

/**
 * Write to PCF8574 \a pcf port \a data.
 * \return true if ok, false on errors.
 */
bool pcf8574_put_3(I2c *i2c, Pcf8574 *pcf, uint8_t data)
{
	i2c_start_w(i2c, PCF8574ID | ((pcf->addr << 1) & 0xF7), 1, I2C_STOP);
	i2c_putc(i2c, data);

	if (i2c_error(i2c))
		return false;

	return true;
}

/**
 * Init a PCF8574 on the bus with addr \a addr.
 * \return true if device is found, false otherwise.
 */
bool pcf8574_init_3(I2c *i2c, Pcf8574 *pcf, pcf8574_addr addr)
{
	ASSERT(i2c);
	pcf->addr = addr;

	return (pcf8574_get(i2c, pcf) != EOF);
}