max31725 - Driver for MAX31725/MAX31726 temperature sensors¶

group max31725

ESP-IDF driver for MAX31725/MAX31726 temperature sensors.

BSD Licensed as described in the file LICENSE

Defines

MAX31725_I2C_ADDR_BASE¶: See full list in datasheet.

Enums

enum max31725_data_format_t¶

Temperature data range.

Values:

enumerator MAX31725_FMT_NORMAL¶

-128 deg.C .

. +127.99609375 deg.C (default)

enumerator MAX31725_FMT_EXTENDED¶

-64 deg.C .

. +191.99609375 deg.C (max 150 deg.C)

enum max31725_fault_queue_t¶

Fault queue size.

Values:

enumerator MAX31725_FAULTS_1¶: 1 fault to trigger OS (default)

enumerator MAX31725_FAULTS_2¶: 2 fault to trigger OS

enumerator MAX31725_FAULTS_4¶: 4 fault to trigger OS

enumerator MAX31725_FAULTS_6¶: 6 fault to trigger OS

enum max31725_os_polarity_t¶

OS polarity.

Values:

enumerator MAX31725_OS_LOW¶: OS active low (default)

enumerator MAX31725_OS_HIGH¶: OS active high.

enum max31725_os_mode_t¶

Mode of OS operation.

Values:

enumerator MAX31725_OS_COMPARATOR¶: OS comparator mode (default)

enumerator MAX31725_OS_INTERRUPT¶: OS interrupt mode.

enum max31725_mode_t¶

Device operating mode.

Values:

enumerator MAX31725_MODE_CONTINUOUS¶: Continuous measurement mode (default)

enumerator MAX31725_MODE_SHUTDOWN¶: Shutdown mode.

Functions

esp_err_t max31725_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.

Parameters

dev – 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 max31725_free_desc(i2c_dev_t *dev)¶

Free device descriptor.

Parameters: dev – Device descriptor
Returns: ESP_OK on success

esp_err_t max31725_get_config(i2c_dev_t *dev, max31725_mode_t *mode, max31725_data_format_t *fmt, max31725_fault_queue_t *fq, max31725_os_polarity_t *op, max31725_os_mode_t *om)¶

Read current device config.

Parameters

dev – Device descriptor
[out] mode – Operating mode
[out] fmt – Data format
[out] fq – Fault queue size
[out] op – OS polarity
[out] om – OS mode

Returns

ESP_OK on success

esp_err_t max31725_set_config(i2c_dev_t *dev, max31725_mode_t mode, max31725_data_format_t fmt, max31725_fault_queue_t fq, max31725_os_polarity_t op, max31725_os_mode_t om)¶

Configure device.

Parameters

dev – Device descriptor
mode – Operating mode
fmt – Data format
fq – Fault queue size
op – OS polarity
om – OS mode

Returns

ESP_OK on success

esp_err_t max31725_one_shot(i2c_dev_t *dev, float *temp, max31725_data_format_t fmt)¶

Made a single-shot measurement.

Works only when device is in shutdown mode. Measurement time is ~50 ms.

Parameters

dev – Device descriptor
[out] temp – Temperature, deg.C
fmt – Data format

Returns

ESP_OK on success

esp_err_t max31725_get_temperature(i2c_dev_t *dev, float *temp, max31725_data_format_t fmt)¶

Read temperature register.

Parameters

dev – Device descriptor
[out] temp – Temperature, deg.C
fmt – Data format

Returns

ESP_OK on success

esp_err_t max31725_get_os_temp(i2c_dev_t *dev, float *temp, max31725_data_format_t fmt)¶

Read OS threshold temperature.

Parameters

dev – Device descriptor
[out] temp – Temperature, deg.C
fmt – Data format

Returns

ESP_OK on success

esp_err_t max31725_set_os_temp(i2c_dev_t *dev, float temp, max31725_data_format_t fmt)¶

Set OS threshold temperature.

Parameters

dev – Device descriptor
temp – Temperature, deg.C
fmt – Data format

Returns

ESP_OK on success

esp_err_t max31725_get_hysteresis_temp(i2c_dev_t *dev, float *temp, max31725_data_format_t fmt)¶

Read OS hysteresis temperature.

Parameters

dev – Device descriptor
[out] temp – Temperature, deg.C
fmt – Data format

Returns

ESP_OK on success

esp_err_t max31725_set_hysteresis_temp(i2c_dev_t *dev, float temp, max31725_data_format_t fmt)¶

Set OS hysteresis temperature.

Parameters

dev – Device descriptor
temp – Temperature, deg.C
fmt – Data format

Returns

ESP_OK on success