lm75: Driver for LM75, a digital temperature sensor and thermal watchdog

Defines

LM75_I2C_ADDRESS_DEFAULT

Default I2C address (A0 == A1 == A2 == 0)

LM75_I2C_ADDRESS_MAX

I2C address (A0 == A1 == A2 == 1)

Enums

enum lm75_mode_t

Operation mode of LM75.

Values:

enumerator LM75_MODE_NORMAL

Normal operation mode.

enumerator LM75_MODE_SHUTDOWN

Shutdown mode.

enum lm75_os_polarity_t

Overtemperature Shutdown Polarity.

Values:

enumerator LM75_OSP_LOW

Overtemperature Shutdown Polarity is active low.

enumerator LM75_OSP_HIGH

OSP is active high.

enum lm75_os_mode_t

Overtemperature Shutdown output mode.

Values:

enumerator LM75_OS_MODE_COMP

OS output mode is comparator.

enumerator LM75_OS_MODE_INT

OS output mode is interrupt.

enum lm75_fault_queue_t

OS fault queue, the number of faults that must occur consecutively to activate the OS output.

Values:

enumerator LM75_FAULT_QUEUE1

1

enumerator LM75_FAULT_QUEUE2

2

enumerator LM75_FAULT_QUEUE4

4

enumerator LM75_FAULT_QUEUE6

6

Functions

esp_err_t lm75_init_desc(i2c_dev_t *dev, uint8_t addr, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio)

Initialize LM75 device descriptor.

i2cdev_init() must be called before this function.

Parameters:

  • dev – [out] pointer to LM75 device descriptor

  • addr – [in] I2C address of LM75

  • port – [in] I2C port

  • sda_gpio – [in] GPIO number of SDA

  • scl_gpio – [in] GPIO number of SCL

Returns:

ESP_OK on success

esp_err_t lm75_init(i2c_dev_t *dev, const lm75_config_t config)

Initialize LM75.

lm75_init_desc() must be called before this function.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • config – [in] configuration

esp_err_t lm75_free_desc(i2c_dev_t *dev)

free LM75 device descriptor

Parameters:

dev – Pointer to device descriptor

esp_err_t lm75_get_os_polarity(i2c_dev_t *dev, uint8_t *v)

Get the value of OS Polarity in the configuration register.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • v – [out] value of OS Polarity

Returns:

ESP_OK on success

esp_err_t lm75_get_os_threshold(i2c_dev_t *dev, float *value)

Get the value of OS threshold in the configuration register.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • value – [out] value of OS threshold

Returns:

ESP_OK on success

esp_err_t lm75_read_temperature(i2c_dev_t *dev, float *value)

Read the temperature.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • value – [out] temperature

Returns:

ESP_OK on success

esp_err_t lm75_set_os_mode(i2c_dev_t *dev, const lm75_os_mode_t v)

Set OS mode.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • v – [in] OS mode

Returns:

ESP_OK on success

esp_err_t lm75_set_os_polarity(i2c_dev_t *dev, const lm75_os_polarity_t v)

Set the value of OS Polarity in the configuration register.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • v – [in] value of OS Polarity

Returns:

ESP_OK on success

esp_err_t lm75_set_os_threshold(i2c_dev_t *dev, const float value)

Set the value of OS threshold in the configuration register.

Parameters:

  • dev – [in] pointer to LM75 device descriptor

  • value – [in] value of OS threshold

Returns:

ESP_OK on success

esp_err_t lm75_shutdown(i2c_dev_t *dev)

Shutdown LM75.

Parameters:

dev – [in] pointer to LM75 device descriptor

Returns:

ESP_OK on success

esp_err_t lm75_wakeup(i2c_dev_t *dev)

Wake LM75 up.

Parameters:

dev – [in] pointer to LM75 device descriptor

Returns:

ESP_OK on success

struct lm75_config_t
#include <lm75.h>

Device configuration.

Public Members

lm75_mode_t mode

Operation mode of the device.

lm75_os_polarity_t os_pol

OS Polarity.

lm75_os_mode_t os_mode

OS mode.

lm75_fault_queue_t os_fault_queue

OS fault queue.