LMT01 Temperature Sensor API

A simple driver for the Texas Instrument's LMT01 temperature sensor.

Introduction

This package contains the LMT01 sensor driver. The driver includes lmt01.c and lmt01.h files.

Integration details

• Integrate lmt01.h and lmt01.c files into the project
• Include the lmt01.h file in your code like below.

#include "lmt_01.h"

File information

• lmt01.h : This header file contains the declarations of the driver APIs.
• lmt01.c : This source file contains the definitions of the driver APIs.

Supported interfaces

• Timer (with clock sourced mapped to GPIO)

User Guide

Prerequisite

• The LMT01 has a unique interface. A series of pulses outputted by the device are used to represent the temperature value. This number of pulses varies with the temperature value.
• This driver requires a timer to be preconfigured with the ability to increment it's counter with every pulse received over GPIO.

Initialising the device

To intialise the device, the user must create a device structure. The user can do this by creating an instance of the structure lmt01_dev. The user must then fill in the various parameters as shown below.

lmt01_status_t rslt = LMT_OK;
lmt01_dev lmt;

lmt.timer = <timer context>;
lmt.start_timer = usr_start_timer;
lmt.stop_timer = usr_stop_timer;
lmt.set_timer_cnt = usr_set_timer_cnt;
lmt.get_timer_cnt = usr_get_timer_cnt;
lmt.delay_ms = usr_delay_ms;

rslt = lmt_init(&lmt);

float temp = -1;

/* Obtain reading from LMT sensor */
rslt = lmt_get_temperature(&lmt, &temp, CONV_TYPE_LUT);

Templates for function pointers

void usr_start_timer(void *timer)
{
}

void usr_stop_timer(void *timer)
{
}

void usr_set_timer_cnt(void *timer, uint32_t *val)
{
}

void usr_get_timer_cnt(void *timer, uint32_t *val)
{
}

void usr_delay_ms(uint32_t period_ms)
{
}