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