mcp4725 - Driver for 12-bit DAC MCP4725¶

group mcp4725

ESP-IDF Driver for 12-bit DAC MCP4725.

Ported from esp-open-rtos

BSD Licensed as described in the file LICENSE

Defines

MCP4725A0_I2C_ADDR0¶

MCP4725A0_I2C_ADDR1¶

MCP4725A1_I2C_ADDR0¶

MCP4725A1_I2C_ADDR1¶

MCP4725A2_I2C_ADDR0¶

MCP4725A2_I2C_ADDR1¶

MCP4725_MAX_VALUE¶

Enums

enum mcp4725_power_mode_t¶

Power mode, see datasheet.

Values:

enumerator MCP4725_PM_NORMAL¶: Normal mode.

enumerator MCP4725_PM_PD_1K¶: Power down, 1kOhm resistor to ground.

enumerator MCP4725_PM_PD_100K¶: Power down, 100kOhm resistor to ground.

enumerator MCP4725_PM_PD_500K¶: Power down, 500kOhm resistor to ground.

Functions

esp_err_t mcp4725_init_desc(i2c_dev_t *dev, i2c_port_t port, uint8_t addr, gpio_num_t sda_gpio, gpio_num_t scl_gpio)¶

Initialize device descriptor.

Default SCL frequency is 1MHz

Parameters

dev – I2C device descriptor
port – I2C port number
addr – I2C address,
sda_gpio – SDA GPIO
scl_gpio – SCL GPIO

Returns

ESP_OK on success

esp_err_t mcp4725_free_desc(i2c_dev_t *dev)¶

Free device descriptor.

Parameters: dev – I2C device descriptor
Returns: ESP_OK on success

esp_err_t mcp4725_eeprom_busy(i2c_dev_t *dev, bool *busy)¶

Get device EEPROM status.

Parameters

dev – I2C device descriptor
busy – true when EEPROM is busy

Returns

ESP_OK on success

esp_err_t mcp4725_get_power_mode(i2c_dev_t *dev, bool eeprom, mcp4725_power_mode_t *mode)¶

Get power mode.

Parameters

dev – I2C device descriptor
eeprom – Read power mode from EEPROM if true
[out] mode – Power mode

Returns

ESP_OK on success

esp_err_t mcp4725_set_power_mode(i2c_dev_t *dev, bool eeprom, mcp4725_power_mode_t mode)¶

Set power mode.

Parameters

dev – I2C device descriptor
mode – Power mode
eeprom – Store mode to device EEPROM if true

Returns

ESP_OK on success

esp_err_t mcp4725_get_raw_output(i2c_dev_t *dev, bool eeprom, uint16_t *value)¶

Get current DAC value.

Parameters

dev – I2C device descriptor
eeprom – Read value from device EEPROM if true
[out] value – Raw output value, 0..4095

Returns

ESP_OK on success

esp_err_t mcp4725_set_raw_output(i2c_dev_t *dev, uint16_t value, bool eeprom)¶

Set DAC output value.

Parameters

dev – I2C device descriptor
value – Raw output value, 0..4095
eeprom – Store value to device EEPROM if true

Returns

ESP_OK on success

esp_err_t mcp4725_get_voltage(i2c_dev_t *dev, float vdd, bool eeprom, float *voltage)¶

Get current DAC output voltage.

Parameters

dev – I2C device descriptor
vdd – Device operating voltage, volts
eeprom – Read voltage from device EEPROM if true
[out] voltage – Current output voltage, volts

Returns

ESP_OK on success

esp_err_t mcp4725_set_voltage(i2c_dev_t *dev, float vdd, float value, bool eeprom)¶

Set DAC output voltage.

Parameters

dev – I2C device descriptor
vdd – Device operating voltage, volts
value – Output value, volts
eeprom – Store value to device EEPROM if true

Returns

ESP_OK on success