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Mark Qvist 2014-04-03 22:21:37 +02:00
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/**
* \file
* <!--
* This file is part of BeRTOS.
*
* Bertos is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
* Copyright 2009 Develer S.r.l. (http://www.develer.com/)
*
* -->
*
* \brief LM75 sensor temperature family.
*
* \author Daniele Basile <asterix@develer.com>
*
*/
#include "lm75.h"
#include "hw/hw_lm75.h"
#include "cfg/cfg_lm75.h"
#include <cfg/debug.h>
#include <cfg/module.h>
// Define logging setting (for cfg/log.h module).
#define LOG_LEVEL LM75_LOG_LEVEL
#define LOG_FORMAT LM75_LOG_FORMAT
#include <cfg/log.h>
#include <drv/i2c.h>
#include <drv/ntc.h> // Macro and data type to manage celsius degree
#define SELECT_ADDRESS(addr) LM75_ADDRESS_BYTE | (addr << 1)
#define LM75_ADDRESS_BYTE 0x91
#define LM75_PAD_BYTE 0x0
#if !CONFIG_I2C_DISABLE_OLD_API
deg_t lm75_read_1(uint8_t sens_addr)
{
return lm75_read_2(&local_i2c_old_api, sens_addr);
}
#endif /* !CONFIG_I2C_DISABLE_OLD_API */
/*
* New API
*/
deg_t lm75_read_2(I2c *i2c, uint8_t sens_addr)
{
uint8_t data[2];
int16_t degree;
int16_t deci_degree;
i2c_start_w(i2c, SELECT_ADDRESS(sens_addr), 1, I2C_NOSTOP);
i2c_putc(i2c, LM75_PAD_BYTE);
i2c_start_r(i2c, SELECT_ADDRESS(sens_addr), sizeof(data), I2C_STOP);
i2c_read(i2c, data, sizeof(data));
if (i2c_error(i2c))
return EOF;
degree = (int16_t)data[0];
deci_degree = (int16_t)(((data[1] >> 7) & 1 ) * 5);
LOG_INFO("[%d.%d C]\n", degree, deci_degree);
return degree * 10 + deci_degree;
}