72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/**
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* \file Driver for PCF8574 compartible remote 8-bit I/O expanders for I2C-bus
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* \author Ruslan V. Uss
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*/
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#ifndef PCF8574_PCF8574_H_
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#define PCF8574_PCF8574_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <i2c/i2c.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/**
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* \brief Read GPIO port value
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* \param addr I2C register address (0b0100<A2><A1><A0> for PCF8574)
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* \return 8-bit GPIO port value
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*/
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uint8_t pcf8574_port_read(i2c_dev_t *dev);
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/**
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* \brief Continiously read GPIO port values to buffer
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* @param addr I2C register address (0b0100<A2><A1><A0> for PCF8574)
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* @param buf Target buffer
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* @param len Buffer length
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* @return Number of bytes read
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*/
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size_t pcf8574_port_read_buf(i2c_dev_t *dev, void *buf, size_t len);
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/**
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* \brief Write value to GPIO port
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* \param addr I2C register address (0b0100<A2><A1><A0> for PCF8574)
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* \param value GPIO port value
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*/
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void pcf8574_port_write(const i2c_dev_t *dev, uint8_t value);
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/**
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* \brief Continiously write GPIO values to GPIO port
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* \param addr I2C register address (0b0100<A2><A1><A0> for PCF8574)
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* @param buf Buffer with values
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* @param len Buffer length
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* @return Number of bytes written
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*/
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size_t pcf8574_port_write_buf(const i2c_dev_t *dev, void *buf, size_t len);
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/**
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* \brief Read input value of a GPIO pin
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* \param addr I2C register address (0b0100<A2><A1><A0> for PCF8574)
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* \param num pin number (0..7)
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* \return GPIO pin value
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*/
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bool pcf8574_gpio_read(i2c_dev_t *dev, uint8_t num);
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/**
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* \brief Set GPIO pin output
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* Note this is READ - MODIFY - WRITE operation! Please read PCF8574
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* datasheet first.
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* \param addr I2C register address (0b0100<A2><A1><A0> for PCF8574)
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* \param num pin number (0..7)
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* \param value true for high level
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*/
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void pcf8574_gpio_write(i2c_dev_t *dev, uint8_t num, bool value);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PCF8574_PCF8574_H_ */
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