pcf8591 - Driver for 8-bit ADC and an 8-bit DAC PCF8591¶
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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, 2018 Ruslan V. Uss
unclerus@gmail.comBSD Licensed as described in the file LICENSE
Defines
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PCF8591_DEFAULT_ADDRESS
¶
Enums
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enum
pcf8591_input_conf_t
¶ Analog inputs configuration, see datasheet.
Values:
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enumerator
PCF8591_IC_4_SINGLES
¶ Four single-ended inputs.
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enumerator
PCF8591_IC_DIFF
¶ Three differential inputs.
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enumerator
PCF8591_IC_2_SINGLES_DIFF
¶ Two single-ended and differential mixed.
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enumerator
PCF8591_IC_2_DIFFS
¶ Two differential inputs.
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enumerator
Functions
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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.
- Return
ESP_OK
on success- Parameters
dev
: Device descriptoraddr
: I2C device addressport
: I2C port numbersda_gpio
: GPIO pin for SDAscl_gpio
: GPIO pin for SCL
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esp_err_t
pcf8591_free_desc
(i2c_dev_t *dev)¶ Free device descriptor.
- Return
ESP_OK
on success- Parameters
dev
: Device descriptor
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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.
- Return
ESP_OK
on success- Parameters
[in] dev
: Device descriptor[in] conf
: Analog inputs configuration[in] channel
: Analog channel[out] value
: Analog value
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