lm35.h File Reference

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API Description

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2016 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <unistd.h>
#include <stdio.h>
#include <signal.h>
#include "lm35.h"
#include "upm_utilities.h"

bool shouldRun = true;

void sig_handler(int signo)
{
  if (signo == SIGINT)
    shouldRun = false;
}

int main()
{
  signal(SIGINT, sig_handler);


  // Instantiate a LM35 on analog pin A0, with a default analog
  // reference voltage of 5.0
  lm35_context sensor = lm35_init(0, 5.0);

  // Every half second, sample the sensor and output the temperature

  while (shouldRun)
    {
        float temp;
        if (lm35_get_temperature(sensor, &temp) != UPM_SUCCESS)
        {
            printf("lm35_get_temperature failed\n");
            return 1;
        }

        printf("Temperature: %3.2f C\n", temp);

        upm_delay_ms(500);
    }


  printf("Exiting\n");

  lm35_close(sensor);

  return 0;
}

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Data Structures
struct	_lm35_context

Functions
lm35_context	lm35_init (int pin, float aref)
void	lm35_close (lm35_context dev)
upm_result_t	lm35_get_temperature (const lm35_context dev, float *temperature)
void	lm35_set_offset (const lm35_context dev, float offset)
void	lm35_set_scale (const lm35_context dev, float scale)

Typedefs
typedef struct _lm35_context *	lm35_context

Function Documentation

lm35_context lm35_init	(	int	pin,
		float	aref
	)

LM35 initialization.

Parameters

pin	Analog pin to use
aref	Analog reference voltage

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void lm35_close

(

lm35_context

dev

)

LM35 close.

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upm_result_t lm35_get_temperature	(	const lm35_context	dev,
		float *	temperature
	)

Returns the temperature in degrees Celsius

Parameters

temperature

A pointer to a float that will contain the measured temperature.

Returns

UPM status

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void lm35_set_offset	(	const lm35_context	dev,
		float	offset
	)

Set sensor offset. This offset is applied to the return values before scaling. Default is 0.0.

Parameters

dev	sensor context pointer
offset	Offset to apply.

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void lm35_set_scale	(	const lm35_context	dev,
		float	scale
	)

Set sensor scale. This scale is applied to the return values before the offset is applied. Default is 1.0.

Parameters

dev	sensor context pointer
scale	Scale to apply.

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Typedef Documentation

typedef struct _lm35_context * lm35_context

device context