pcf8591 - Driver for 8-bit ADC and an 8-bit DAC PCF8591
- group pcf8591
ESP-IDF driver for 8-bit analog-to-digital conversion and an 8-bit digital-to-analog conversion PCF8591.
Ported from esp-open-rtos
Copyright (c) 2017 Pham Ngoc Thanh pnt239@gmail.com Copyright (c) 2017 Ruslan V. Uss unclerus@gmail.com
BSD Licensed as described in the file LICENSE
Defines
-
PCF8591_DEFAULT_ADDRESS
Enums
-
enum pcf8591_input_conf_t
Analog inputs configuration, see datasheet.
Values:
-
enumerator PCF8591_IC_4_SINGLES
Four single-ended inputs.
-
enumerator PCF8591_IC_DIFF
Three differential inputs.
-
enumerator PCF8591_IC_2_SINGLES_DIFF
Two single-ended and differential mixed.
-
enumerator PCF8591_IC_2_DIFFS
Two differential inputs.
-
enumerator PCF8591_IC_4_SINGLES
Functions
-
esp_err_t pcf8591_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.
- Parameters:
dev – Device descriptor
addr – I2C device address
port – I2C port number
sda_gpio – GPIO pin for SDA
scl_gpio – GPIO pin for SCL
- Returns:
ESP_OK
on success
-
esp_err_t pcf8591_free_desc(i2c_dev_t *dev)
Free device descriptor.
- Parameters:
dev – Device descriptor
- Returns:
ESP_OK
on success
-
esp_err_t pcf8591_read(i2c_dev_t *dev, pcf8591_input_conf_t conf, uint8_t channel, uint8_t *value)
Read input value of an analog pin.
- Parameters:
dev – Device descriptor
conf – Analog inputs configuration
channel – Analog channel
value – [out] Analog value
- Returns:
ESP_OK
on success
-
PCF8591_DEFAULT_ADDRESS