1-Wire - 1-Wire implementation, using DS2480B controller i…

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Paul van der Wielen / Mbed 2 deprecated 1-Wire

1-Wire implementation, using DS2480B controller interfaced with serial port, working example to read DS18B20, based on work already in progress / Dallas - Public domain code

Dependencies: mbed

ds2480ut.cpp@0:1193dbfe28e2, 2011-03-24 (annotated)

Committer:: pwheels
Date:: Thu Mar 24 17:21:29 2011 +0000
Revision:: 0:1193dbfe28e2

Who changed what in which revision?

User	Revision	Line number	New contents of line
pwheels	0:1193dbfe28e2	1	//---------------------------------------------------------------------------
pwheels	0:1193dbfe28e2	2	// Copyright (C) 2000v Dallas Semiconductor Corporation, All Rights Reserved.
pwheels	0:1193dbfe28e2	3	//
pwheels	0:1193dbfe28e2	4	// Permission is hereby granted, free of charge, to any person obtaining a
pwheels	0:1193dbfe28e2	5	// copy of this software and associated documentation files (the "Software"),
pwheels	0:1193dbfe28e2	6	// to deal in the Software without restriction, including without limitation
pwheels	0:1193dbfe28e2	7	// the rights to use, copy, modify, merge, publish, distribute, sublicense,
pwheels	0:1193dbfe28e2	8	// and/or sell copies of the Software, and to permit persons to whom the
pwheels	0:1193dbfe28e2	9	// Software is furnished to do so, subject to the following conditions:
pwheels	0:1193dbfe28e2	10	//
pwheels	0:1193dbfe28e2	11	// The above copyright notice and this permission notice shall be included
pwheels	0:1193dbfe28e2	12	// in all copies or substantial portions of the Software.
pwheels	0:1193dbfe28e2	13	//
pwheels	0:1193dbfe28e2	14	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
pwheels	0:1193dbfe28e2	15	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
pwheels	0:1193dbfe28e2	16	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
pwheels	0:1193dbfe28e2	17	// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
pwheels	0:1193dbfe28e2	18	// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
pwheels	0:1193dbfe28e2	19	// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
pwheels	0:1193dbfe28e2	20	// OTHER DEALINGS IN THE SOFTWARE.
pwheels	0:1193dbfe28e2	21	//
pwheels	0:1193dbfe28e2	22	// Except as contained in this notice, the name of Dallas Semiconductor
pwheels	0:1193dbfe28e2	23	// shall not be used except as stated in the Dallas Semiconductor
pwheels	0:1193dbfe28e2	24	// Branding Policy.
pwheels	0:1193dbfe28e2	25	//---------------------------------------------------------------------------
pwheels	0:1193dbfe28e2	26	//
pwheels	0:1193dbfe28e2	27	// ds2480ut.c - DS2480B utility functions.
pwheels	0:1193dbfe28e2	28	//
pwheels	0:1193dbfe28e2	29	// Version: 2.01
pwheels	0:1193dbfe28e2	30	//
pwheels	0:1193dbfe28e2	31	// History: 1.00 -> 1.01 Default PDSRC changed from 0.83 to 1.37V/us
pwheels	0:1193dbfe28e2	32	// in DS2480Detect. Changed to use msDelay instead
pwheels	0:1193dbfe28e2	33	// of Delay.
pwheels	0:1193dbfe28e2	34	// 1.01 -> 1.02 Changed global declarations from 'uchar' to 'int'.
pwheels	0:1193dbfe28e2	35	// Changed DSO/WORT from 7 to 10us in DS2480Detect.
pwheels	0:1193dbfe28e2	36	// 1.02 -> 1.03 Removed caps in #includes for Linux capatibility
pwheels	0:1193dbfe28e2	37	// 1.03 -> 2.00 Changed 'MLan' to 'ow'. Added support for
pwheels	0:1193dbfe28e2	38	// multiple ports. Changed W1LT to 8us.
pwheels	0:1193dbfe28e2	39	// 2.00 -> 2.01 Added error handling. Added circular-include check.
pwheels	0:1193dbfe28e2	40	// 2.01 -> 2.10 Added raw memory error handling and SMALLINT
pwheels	0:1193dbfe28e2	41	// 2.10 -> 3.00 Added memory bank functionality
pwheels	0:1193dbfe28e2	42	// Added file I/O operations
pwheels	0:1193dbfe28e2	43	// 3.00 -> 3.10 Modified as to properly work with mbed and send code
pwheels	0:1193dbfe28e2	44	// as defined by AN192 / DS2480B PDF's
pwheels	0:1193dbfe28e2	45	//
pwheels	0:1193dbfe28e2	46
pwheels	0:1193dbfe28e2	47	#include "ownet.h"
pwheels	0:1193dbfe28e2	48	#include "./Headers/ds2480.h"
pwheels	0:1193dbfe28e2	49
pwheels	0:1193dbfe28e2	50	// global DS2480B state
pwheels	0:1193dbfe28e2	51	SMALLINT ULevel[MAX_PORTNUM]; // current DS2480B 1-Wire Net level
pwheels	0:1193dbfe28e2	52	SMALLINT UBaud[MAX_PORTNUM]; // current DS2480B baud rate
pwheels	0:1193dbfe28e2	53	SMALLINT UMode[MAX_PORTNUM]; // current DS2480B command or data mode state
pwheels	0:1193dbfe28e2	54	SMALLINT USpeed[MAX_PORTNUM]; // current DS2480B 1-Wire Net communication speed
pwheels	0:1193dbfe28e2	55	SMALLINT UVersion[MAX_PORTNUM]; // current DS2480B version
pwheels	0:1193dbfe28e2	56
pwheels	0:1193dbfe28e2	57	//---------------------------------------------------------------------------
pwheels	0:1193dbfe28e2	58	// Attempt to resyc and detect a DS2480B
pwheels	0:1193dbfe28e2	59	//
pwheels	0:1193dbfe28e2	60	// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
pwheels	0:1193dbfe28e2	61	// OpenCOM to indicate the port number.
pwheels	0:1193dbfe28e2	62	//
pwheels	0:1193dbfe28e2	63	// Returns: TRUE - DS2480B detected successfully
pwheels	0:1193dbfe28e2	64	// FALSE - Could not detect DS2480B
pwheels	0:1193dbfe28e2	65	//
pwheels	0:1193dbfe28e2	66	SMALLINT DS2480Detect(int portnum)
pwheels	0:1193dbfe28e2	67	{
pwheels	0:1193dbfe28e2	68	uchar sendpacket[10],readbuffer[10];
pwheels	0:1193dbfe28e2	69	uchar sendlen=0;
pwheels	0:1193dbfe28e2	70
pwheels	0:1193dbfe28e2	71	// reset modes
pwheels	0:1193dbfe28e2	72	UMode[portnum] = MODSEL_COMMAND;
pwheels	0:1193dbfe28e2	73	/* has been changed, this is causing issue's when not sending RX invert using MBED
pwheels	0:1193dbfe28e2	74	UBaud[portnum] = PARMSET_INV_9600; */
pwheels	0:1193dbfe28e2	75	UBaud[portnum] = PARMSET_9600;
pwheels	0:1193dbfe28e2	76	USpeed[portnum] = SPEEDSEL_FLEX;
pwheels	0:1193dbfe28e2	77
pwheels	0:1193dbfe28e2	78	// set the baud rate to 9600
pwheels	0:1193dbfe28e2	79	SetBaudCOM(portnum,(uchar)UBaud[portnum]);
pwheels	0:1193dbfe28e2	80
pwheels	0:1193dbfe28e2	81	// send a break to reset the DS2480
pwheels	0:1193dbfe28e2	82	BreakCOM(portnum);
pwheels	0:1193dbfe28e2	83
pwheels	0:1193dbfe28e2	84	// delay to let line settle
pwheels	0:1193dbfe28e2	85	msDelay(2);
pwheels	0:1193dbfe28e2	86
pwheels	0:1193dbfe28e2	87	// flush the buffers
pwheels	0:1193dbfe28e2	88	FlushCOM(portnum);
pwheels	0:1193dbfe28e2	89
pwheels	0:1193dbfe28e2	90	// send the reset byte
pwheels	0:1193dbfe28e2	91	sendpacket[0] = 0xC1;
pwheels	0:1193dbfe28e2	92	if (WriteCOM(portnum,1,sendpacket) != 1)
pwheels	0:1193dbfe28e2	93	{
pwheels	0:1193dbfe28e2	94	OWERROR(OWERROR_WRITECOM_FAILED);
pwheels	0:1193dbfe28e2	95	return FALSE;
pwheels	0:1193dbfe28e2	96	}
pwheels	0:1193dbfe28e2	97
pwheels	0:1193dbfe28e2	98	// delay to let line settle
pwheels	0:1193dbfe28e2	99	msDelay(2);
pwheels	0:1193dbfe28e2	100
pwheels	0:1193dbfe28e2	101	/* has been removed as this is causing issue's when used with mbed
pwheels	0:1193dbfe28e2	102	// send the Baud Rate byte, which also inverts RX signal
pwheels	0:1193dbfe28e2	103	sendpacket[0] = 0x79;
pwheels	0:1193dbfe28e2	104	if (WriteCOM(portnum,1,sendpacket) != 1)
pwheels	0:1193dbfe28e2	105	{
pwheels	0:1193dbfe28e2	106	OWERROR(OWERROR_WRITECOM_FAILED);
pwheels	0:1193dbfe28e2	107	return FALSE;
pwheels	0:1193dbfe28e2	108	}
pwheels	0:1193dbfe28e2	109
pwheels	0:1193dbfe28e2	110	// delay to let line settle
pwheels	0:1193dbfe28e2	111	msDelay(4);
pwheels	0:1193dbfe28e2	112	*/
pwheels	0:1193dbfe28e2	113	// set the FLEX configuration parameters
pwheels	0:1193dbfe28e2	114	// default PDSRC = 1.37Vus
pwheels	0:1193dbfe28e2	115	sendpacket[sendlen++] = CMD_CONFIG \| PARMSEL_SLEW \| PARMSET_Slew1p37Vus;
pwheels	0:1193dbfe28e2	116	// default W1LT = 10us
pwheels	0:1193dbfe28e2	117	sendpacket[sendlen++] = CMD_CONFIG \| PARMSEL_WRITE1LOW \| PARMSET_Write10us;
pwheels	0:1193dbfe28e2	118	// default DSO/WORT = 8us
pwheels	0:1193dbfe28e2	119	sendpacket[sendlen++] = CMD_CONFIG \| PARMSEL_SAMPLEOFFSET \| PARMSET_SampOff8us;
pwheels	0:1193dbfe28e2	120	// construct the command to read the baud rate (to test command block)
pwheels	0:1193dbfe28e2	121	sendpacket[sendlen++] = CMD_CONFIG \| PARMSEL_PARMREAD \| (PARMSEL_BAUDRATE >> 3);
pwheels	0:1193dbfe28e2	122	// also do 1 bit operation (to test 1-Wire block)
pwheels	0:1193dbfe28e2	123	sendpacket[sendlen++] = CMD_COMM \| FUNCTSEL_BIT \| UBaud[portnum] \| BITPOL_ONE;
pwheels	0:1193dbfe28e2	124
pwheels	0:1193dbfe28e2	125	// flush the buffers
pwheels	0:1193dbfe28e2	126	FlushCOM(portnum);
pwheels	0:1193dbfe28e2	127	// send the packet
pwheels	0:1193dbfe28e2	128	if (WriteCOM(portnum,sendlen,sendpacket))
pwheels	0:1193dbfe28e2	129	{
pwheels	0:1193dbfe28e2	130	// read back the response
pwheels	0:1193dbfe28e2	131	if (ReadCOM(portnum,5,readbuffer) == 5)
pwheels	0:1193dbfe28e2	132	{
pwheels	0:1193dbfe28e2	133	// look at the baud rate and bit operation
pwheels	0:1193dbfe28e2	134	// to see if the response makes sense
pwheels	0:1193dbfe28e2	135	if (((readbuffer[3] & 0xF1) == 0x00) &&
pwheels	0:1193dbfe28e2	136	((readbuffer[3] & 0x0E) == UBaud[portnum]) &&
pwheels	0:1193dbfe28e2	137	((readbuffer[4] & 0xF0) == 0x90) &&
pwheels	0:1193dbfe28e2	138	((readbuffer[4] & 0x0C) == UBaud[portnum]))
pwheels	0:1193dbfe28e2	139	return TRUE;
pwheels	0:1193dbfe28e2	140	else
pwheels	0:1193dbfe28e2	141	OWERROR(OWERROR_DS2480_BAD_RESPONSE);
pwheels	0:1193dbfe28e2	142	}
pwheels	0:1193dbfe28e2	143	else
pwheels	0:1193dbfe28e2	144	OWERROR(OWERROR_READCOM_FAILED);
pwheels	0:1193dbfe28e2	145	}
pwheels	0:1193dbfe28e2	146	else
pwheels	0:1193dbfe28e2	147	OWERROR(OWERROR_WRITECOM_FAILED);
pwheels	0:1193dbfe28e2	148
pwheels	0:1193dbfe28e2	149	return FALSE;
pwheels	0:1193dbfe28e2	150	}
pwheels	0:1193dbfe28e2	151
pwheels	0:1193dbfe28e2	152	//---------------------------------------------------------------------------
pwheels	0:1193dbfe28e2	153	// Change the DS2480B from the current baud rate to the new baud rate.
pwheels	0:1193dbfe28e2	154	//
pwheels	0:1193dbfe28e2	155	// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
pwheels	0:1193dbfe28e2	156	// OpenCOM to indicate the port number.
pwheels	0:1193dbfe28e2	157	// 'newbaud' - the new baud rate to change to, defined as:
pwheels	0:1193dbfe28e2	158	// PARMSET_9600 0x00
pwheels	0:1193dbfe28e2	159	// PARMSET_19200 0x02
pwheels	0:1193dbfe28e2	160	// PARMSET_57600 0x04
pwheels	0:1193dbfe28e2	161	// PARMSET_115200 0x06
pwheels	0:1193dbfe28e2	162	//
pwheels	0:1193dbfe28e2	163	// Returns: current DS2480B baud rate.
pwheels	0:1193dbfe28e2	164	//
pwheels	0:1193dbfe28e2	165	SMALLINT DS2480ChangeBaud(int portnum, uchar newbaud)
pwheels	0:1193dbfe28e2	166	{
pwheels	0:1193dbfe28e2	167	uchar rt=FALSE;
pwheels	0:1193dbfe28e2	168	uchar readbuffer[5],sendpacket[5],sendpacket2[5];
pwheels	0:1193dbfe28e2	169	uchar sendlen=0,sendlen2=0;
pwheels	0:1193dbfe28e2	170
pwheels	0:1193dbfe28e2	171	// see if diffenent then current baud rate
pwheels	0:1193dbfe28e2	172	if (UBaud[portnum] == newbaud)
pwheels	0:1193dbfe28e2	173	return UBaud[portnum];
pwheels	0:1193dbfe28e2	174	else
pwheels	0:1193dbfe28e2	175	{
pwheels	0:1193dbfe28e2	176	// build the command packet
pwheels	0:1193dbfe28e2	177	// check if correct mode
pwheels	0:1193dbfe28e2	178	if (UMode[portnum] != MODSEL_COMMAND)
pwheels	0:1193dbfe28e2	179	{
pwheels	0:1193dbfe28e2	180	UMode[portnum] = MODSEL_COMMAND;
pwheels	0:1193dbfe28e2	181	sendpacket[sendlen++] = MODE_COMMAND;
pwheels	0:1193dbfe28e2	182	}
pwheels	0:1193dbfe28e2	183	// build the command
pwheels	0:1193dbfe28e2	184	sendpacket[sendlen++] = CMD_CONFIG \| PARMSEL_BAUDRATE \| newbaud;
pwheels	0:1193dbfe28e2	185
pwheels	0:1193dbfe28e2	186	// flush the buffers
pwheels	0:1193dbfe28e2	187	FlushCOM(portnum);
pwheels	0:1193dbfe28e2	188
pwheels	0:1193dbfe28e2	189	// send the packet
pwheels	0:1193dbfe28e2	190	if (!WriteCOM(portnum,sendlen,sendpacket))
pwheels	0:1193dbfe28e2	191	{
pwheels	0:1193dbfe28e2	192	OWERROR(OWERROR_WRITECOM_FAILED);
pwheels	0:1193dbfe28e2	193	rt = FALSE;
pwheels	0:1193dbfe28e2	194	}
pwheels	0:1193dbfe28e2	195	else
pwheels	0:1193dbfe28e2	196	{
pwheels	0:1193dbfe28e2	197	// make sure buffer is flushed
pwheels	0:1193dbfe28e2	198	msDelay(5);
pwheels	0:1193dbfe28e2	199
pwheels	0:1193dbfe28e2	200	// change our baud rate
pwheels	0:1193dbfe28e2	201	SetBaudCOM(portnum,newbaud);
pwheels	0:1193dbfe28e2	202	UBaud[portnum] = newbaud;
pwheels	0:1193dbfe28e2	203
pwheels	0:1193dbfe28e2	204	// wait for things to settle
pwheels	0:1193dbfe28e2	205	msDelay(5);
pwheels	0:1193dbfe28e2	206
pwheels	0:1193dbfe28e2	207	// build a command packet to read back baud rate
pwheels	0:1193dbfe28e2	208	sendpacket2[sendlen2++] = CMD_CONFIG \| PARMSEL_PARMREAD \| (PARMSEL_BAUDRATE >> 3);
pwheels	0:1193dbfe28e2	209
pwheels	0:1193dbfe28e2	210	// flush the buffers
pwheels	0:1193dbfe28e2	211	FlushCOM(portnum);
pwheels	0:1193dbfe28e2	212
pwheels	0:1193dbfe28e2	213	// send the packet
pwheels	0:1193dbfe28e2	214	if (WriteCOM(portnum,sendlen2,sendpacket2))
pwheels	0:1193dbfe28e2	215	{
pwheels	0:1193dbfe28e2	216	// read back the 1 byte response
pwheels	0:1193dbfe28e2	217	if (ReadCOM(portnum,1,readbuffer) == 1)
pwheels	0:1193dbfe28e2	218	{
pwheels	0:1193dbfe28e2	219	// verify correct baud
pwheels	0:1193dbfe28e2	220	if (((readbuffer[0] & 0x0E) == (sendpacket[sendlen-1] & 0x0E)))
pwheels	0:1193dbfe28e2	221	rt = TRUE;
pwheels	0:1193dbfe28e2	222	else
pwheels	0:1193dbfe28e2	223	OWERROR(OWERROR_DS2480_WRONG_BAUD);
pwheels	0:1193dbfe28e2	224	}
pwheels	0:1193dbfe28e2	225	else
pwheels	0:1193dbfe28e2	226	OWERROR(OWERROR_READCOM_FAILED);
pwheels	0:1193dbfe28e2	227	}
pwheels	0:1193dbfe28e2	228	else
pwheels	0:1193dbfe28e2	229	OWERROR(OWERROR_WRITECOM_FAILED);
pwheels	0:1193dbfe28e2	230	}
pwheels	0:1193dbfe28e2	231	}
pwheels	0:1193dbfe28e2	232
pwheels	0:1193dbfe28e2	233	// if lost communication with DS2480 then reset
pwheels	0:1193dbfe28e2	234	if (rt != TRUE)
pwheels	0:1193dbfe28e2	235	DS2480Detect(portnum);
pwheels	0:1193dbfe28e2	236
pwheels	0:1193dbfe28e2	237	return UBaud[portnum];
pwheels	0:1193dbfe28e2	238	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	24 Mar 2011
Imports:	104
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	6

ds2480ut.cpp@0:1193dbfe28e2, 2011-03-24 (annotated)

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