pcf8574: Driver for PCF8574 remote 8-bit I/O expander for I2C-bus
Functions
- esp_err_t pcf8574_init_desc(i2c_dev_t *dev, uint8_t addr, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio)
Initialize device descriptor.
Default SCL frequency is 100kHz
- Parameters:
dev – Pointer to I2C device descriptor
port – I2C port number
addr – I2C address (0b0100[A2][A1][A0] for PCF8574, 0b0111[A2][A1][A0] for PCF8574A)
sda_gpio – SDA GPIO
scl_gpio – SCL GPIO
- Returns:
ESP_OKon success
- esp_err_t pcf8574_free_desc(i2c_dev_t *dev)
Free device descriptor.
- Parameters:
dev – Pointer to I2C device descriptor
- Returns:
ESP_OKon success
- esp_err_t pcf8574_port_read(i2c_dev_t *dev, uint8_t *val)
Read GPIO port value.
- Parameters:
dev – Pointer to I2C device descriptor
val – 8-bit GPIO port value
- Returns:
ESP_OKon success
- esp_err_t pcf8574_port_write(i2c_dev_t *dev, uint8_t value)
Write value to GPIO port.
- Parameters:
dev – Pointer to I2C device descriptor
value – GPIO port value
- Returns:
ESP_OK on success