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148 lines
3.6 KiB
C
Executable File
148 lines
3.6 KiB
C
Executable File
/*! \file ds1631.c \brief Dallas DS1631 Temperature Sensor Driver Library. */
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//*****************************************************************************
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//
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// File Name : 'ds1631.c'
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// Title : Dallas DS1631 Temperature Sensor Driver Library
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// Author : Pascal Stang - Copyright (C) 2004
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// Created : 2004.02.10
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// Revised : 2004.02.19
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// Version : 0.1
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// Target MCU : Atmel AVR Series
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// Editor Tabs : 4
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//
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// NOTE: This code is currently below version 1.0, and therefore is considered
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// to be lacking in some functionality or documentation, or may not be fully
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// tested. Nonetheless, you can expect most functions to work.
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//
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// This code is distributed under the GNU Public License
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// which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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#include <avr/io.h>
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#include <avr/signal.h>
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#include <avr/interrupt.h>
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#include "global.h"
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#include "timer.h"
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#include "i2c.h"
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#include "ds1631.h"
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// global variables
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// Functions
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u08 ds1631Init(u08 i2cAddr)
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{
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u08 chip_ok;
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// issue a reset
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if(ds1631Reset(i2cAddr) == I2C_OK)
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chip_ok = TRUE;
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else
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chip_ok = FALSE;
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// set a default configuration
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// (1-shot mode, T_OUT active high, and 12-bit conversion)
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ds1631SetConfig(i2cAddr,
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DS1631_CONFIG_1SHOT | DS1631_CONFIG_POL |
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DS1631_CONFIG_R0 | DS1631_CONFIG_R1);
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return chip_ok;
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}
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u08 ds1631Reset(u08 i2cAddr)
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{
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u08 buffer[1];
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// return the DS1631 to power-on reset defaults
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buffer[0] = DS1631_CMD_SWPOR;
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return i2cMasterSendNI(i2cAddr, 1, buffer);
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}
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void ds1631SetConfig(u08 i2cAddr, u08 config)
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{
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u08 buffer[2];
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// write the DS1631 configuration byte
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buffer[0] = DS1631_CMD_ACCESSCONFIG;
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buffer[1] = config;
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i2cMasterSendNI(i2cAddr, 2, buffer);
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}
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u08 ds1631GetConfig(u08 i2cAddr)
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{
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u08 buffer[1];
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// write the DS1631 configuration byte
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buffer[0] = DS1631_CMD_ACCESSCONFIG;
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i2cMasterSendNI(i2cAddr, 2, buffer);
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i2cMasterReceiveNI(i2cAddr, 2, buffer);
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return buffer[0];
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}
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void ds1631StartConvert(u08 i2cAddr)
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{
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u08 buffer[1];
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// send the DS1631 Start Convert command
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buffer[0] = DS1631_CMD_STARTCONV;
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i2cMasterSendNI(i2cAddr, 1, buffer);
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}
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void ds1631StopConvert(u08 i2cAddr)
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{
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u08 buffer[1];
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// send the DS1631 Stop Convert command
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buffer[0] = DS1631_CMD_STOPCONV;
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i2cMasterSendNI(i2cAddr, 1, buffer);
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}
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s16 ds1631ReadTemp(u08 i2cAddr)
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{
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// read the Temperature register and return the result
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return ds1631ReadTempReg(i2cAddr, DS1631_CMD_READTEMP);
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}
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void ds1631SetTH(u08 i2cAddr, s16 value)
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{
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// write the TH register
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ds1631WriteTempReg(i2cAddr, DS1631_CMD_ACCESSTH, value);
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}
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void ds1631SetTL(u08 i2cAddr, s16 value)
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{
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// write the TL register
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ds1631WriteTempReg(i2cAddr, DS1631_CMD_ACCESSTL, value);
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}
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s16 ds1631GetTH(u08 i2cAddr)
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{
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// read the TH register and return the result
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return ds1631ReadTempReg(i2cAddr, DS1631_CMD_ACCESSTH);
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}
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s16 ds1631GetTL(u08 i2cAddr)
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{
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// read the TL register and return the result
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return ds1631ReadTempReg(i2cAddr, DS1631_CMD_ACCESSTL);
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}
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s16 ds1631ReadTempReg(u08 i2cAddr, u08 cmd)
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{
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u08 buffer[2];
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s16 T;
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// read the temperature value from the requested register
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i2cMasterSendNI(i2cAddr, 1, &cmd);
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i2cMasterReceiveNI(i2cAddr, 2, buffer);
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// pack bytes
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T = (s16)((buffer[0]<<8) | buffer[1]);
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// return result
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return T;
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}
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void ds1631WriteTempReg(u08 i2cAddr, u08 cmd, s16 value)
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{
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u08 buffer[3];
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// write the requested register with a temperature value
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buffer[0] = cmd;
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buffer[1] = value>>8;
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buffer[2] = value;
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i2cMasterSendNI(i2cAddr, 3, buffer);
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}
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