pcf8574 - Driver for PCF8574 8-bit I/O expander for I2C-bus¶
- group pcf8574
ESP-IDF driver for PCF8574 compatible remote 8-bit I/O expanders for I2C-bus.
Copyright (c) 2018 Ruslan V. Uss unclerus@gmail.com
MIT Licensed as described in the file LICENSE
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_OK
on success
-
esp_err_t pcf8574_free_desc(i2c_dev_t *dev)¶
Free device descriptor.
- Parameters
dev – Pointer to I2C device descriptor
- Returns
ESP_OK
on success
-
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)¶