pcf8575: Driver for PCF8575 remote 16-bit I/O expander for I2C-bus
Defines
- PCF8575_I2C_ADDR_BASE
Functions
- esp_err_t pcf8575_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 400kHz
- Parameters:
dev – Pointer to I2C device descriptor
port – I2C port number
addr – I2C address (
0b0100<A2><A1><A0>for PCF8575)sda_gpio – SDA GPIO
scl_gpio – SCL GPIO
- Returns:
ESP_OKon success
- esp_err_t pcf8575_free_desc(i2c_dev_t *dev)
Free device descriptor.
- Parameters:
dev – Pointer to I2C device descriptor
- Returns:
ESP_OKon success
- esp_err_t pcf8575_port_read(i2c_dev_t *dev, uint16_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 pcf8575_port_write(i2c_dev_t *dev, uint16_t value)
Write value to GPIO port.
- Parameters:
dev – Pointer to I2C device descriptor
value – GPIO port value
- Returns:
ESP_OK on success