pca9557 - Driver for PCA9537/PCA9557 remote 4/8-bit I/O expanders for I2C-bus

group pca9557

ESP-IDF driver for PCA9537/PCA9557 remote 4/8-bit I/O expanders for I2C-bus.

Copyright (c) 2021 Ruslan V. Uss unclerus@gmail.com

BSD Licensed as described in the file LICENSE

Defines

PCA9537_I2C_ADDR

I2C address for PCA9537.

PCA9557_I2C_ADDR_BASE

Base I2C address for PCA9557.

Functions

esp_err_t pca9557_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 (0b0011<A2><A1><A0> for PCA9557/PCA9537_I2C_ADDR for PCA9537)

  • sda_gpio – SDA GPIO

  • scl_gpio – SCL GPIO

Returns

ESP_OK on success

esp_err_t pca9557_free_desc(i2c_dev_t *dev)

Free device descriptor.

Parameters

dev – Pointer to I2C device descriptor

Returns

ESP_OK on success

esp_err_t pca9557_port_get_mode(i2c_dev_t *dev, uint8_t *mode)

Get directions of I/O pins.

0 - output, 1 - input for each bit in mode

Parameters
  • dev – Pointer to device descriptor

  • mode[out] I/O directions

Returns

ESP_OK on success

esp_err_t pca9557_port_set_mode(i2c_dev_t *dev, uint8_t mode)

Set directions of I/O pins.

0 - output, 1 - input for each bit in mode

Parameters
  • dev – Pointer to device descriptor

  • mode – I/O directions

Returns

ESP_OK on success

esp_err_t pca9557_port_get_polarity(i2c_dev_t *dev, uint8_t *pol)

Get input polarity settings.

0 - normal input polarity, 1 - inverted for each bit in pol

Parameters
  • dev – Pointer to device descriptor

  • pol[out] Input polarity settings

Returns

ESP_OK on success

esp_err_t pca9557_port_set_polarity(i2c_dev_t *dev, uint8_t pol)

Set input polarity settings.

0 - normal input polarity, 1 - inverted for each bit in pol

Parameters
  • dev – Pointer to device descriptor

  • pol – Input polarity settings

Returns

ESP_OK on success

esp_err_t pca9557_port_read(i2c_dev_t *dev, uint8_t *val)

Read I/O port value.

Parameters
  • dev – Pointer to I2C device descriptor

  • val[out] 8-bit GPIO port value for PCA9557 or 4-bit port value for PCA9537

Returns

ESP_OK on success

esp_err_t pca9557_port_write(i2c_dev_t *dev, uint8_t val)

Write value to I/O port.

Parameters
  • dev – Pointer to I2C device descriptor

  • val – 8-bit GPIO port value for PCA9557 or 4-bit port value for PCA9537

Returns

ESP_OK on success

esp_err_t pca9557_get_level(i2c_dev_t *dev, uint8_t pin, uint32_t *val)

Read I/O pin level.

Parameters
  • dev – Pointer to device descriptor

  • pin – Pin number, 0..7 for PCA9557, 0..3 for PC9537

  • val[out] true if pin currently in high state

Returns

ESP_OK on success

esp_err_t pca9557_set_level(i2c_dev_t *dev, uint8_t pin, uint32_t val)

Set I/O pin level.

Pin must be set up as output

Parameters
  • dev – Pointer to device descriptor

  • pin – Pin number, 0..7 for PCA9557, 0..3 for PC9537

  • val[out] true if pin currently in high state

Returns

ESP_OK on success