File content as of revision 2:193926923cb0:
/*
* OneWireEEPROM. Library for Maxim One-Wire EEPROM.
*
* see http://www.maxim-ic.com
*
* DS2433
* DS28EC20
*
* Copyright (C) <2011> Wim De Roeve <wim312@gmail.com>
*
* OneWireEEPROM 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 3 of the License, or
* (at your option) any later version.
*
* OneWireEEPROM 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
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "mbed.h"
#include "OneWireEEPROM.h"
Serial output(USBTX, USBRX);
OneWireEEPROM::OneWireEEPROM(PinName pin, bool crcOn, bool useAddr, bool parasitic, DSTYPE ds, unsigned char *ROMaddress)
:oneWire(pin, STANDARD) {
_useCRC=crcOn;
_useAddress=useAddr;
_useParasiticPower=parasitic;
switch (ds) {
case DS2433: {
_pages = DS2433PAGES;
_eeprom_id =DS2433EEPROM_ID;
break;
}
case DS28EC20: {
_pages =DS28EC20PAGES;
_eeprom_id =DS28EC20EEPROM_ID;
break;
}
}
_memsize = _pages * PAGESIZE;
if (_useAddress) {
for (int i = 0; i < ADDRESS_SIZE; i++)
_ROMCode[i]=ROMaddress[i];
} else {
for (int i = 0; i < ADDRESS_SIZE; i++)
_ROMCode[i]=0;
}
active=0;
}
bool OneWireEEPROM::Initialize() {
int OneWireFound;
int OneWireSameAddress;
int i;
BYTE _dummyaddress[8];
if (_useAddress) {
output.printf("\r\nScan for device with address ");
for (i = 0; i < ADDRESS_SIZE; i++) {
output.printf("%x ", (int)_ROMCode[i]);
}
output.printf("\r\n");
}
OneWireSameAddress=0;
oneWire.resetSearch();
do {
OneWireFound=(oneWire.search(_dummyaddress));
if (OneWireFound) {
if (!_useAddress) {
output.printf("Device found with Address = ");
for (i = 0; i < ADDRESS_SIZE; i++) {
output.printf("%x ", (int)_dummyaddress[i]);
}
}
OneWireSameAddress=1;
if (_useAddress) {
for (i = 0; i < ADDRESS_SIZE; i++) {
if (!((OneWireSameAddress) && (_ROMCode[i] ==_dummyaddress[i])))
OneWireSameAddress=0;
}
} else {
for (i = 0; i < ADDRESS_SIZE; i++) {
_ROMCode[i] =_dummyaddress[i];
}
}
/*if (OneWireSameAddress) {
output.printf("-> Address valid!\r\n");
} else {
}*/
} else {
output.printf("No more addresses.\r\n");
oneWire.resetSearch();
wait_ms(250); //500
}
} while (OneWireFound && !OneWireSameAddress);
if (!OneWireSameAddress) {
output.printf("-> No Valid ROM Code found.\r\n");
return false;
}
if (OneWireCRC::crc8(_ROMCode, ADDRESS_CRC_BYTE) != _ROMCode[ADDRESS_CRC_BYTE]) { // check address CRC is valid
output.printf("CRC is not valid!\r\n");
wait_ms(100);
return false;
}
if (_ROMCode[0] != _eeprom_id) {
output.printf("Device is not a OneWireEEPROM_ID device.\r\n");
wait_ms(100);
return false;
} else {
output.printf("OneWireEEPROM present and correct.\r\n");
}
active=1;
return true;
}
void OneWireEEPROM::ResetAndAddress() {
oneWire.reset(); // reset device
if (_useAddress) {
oneWire.matchROM(_ROMCode); // select which device to talk to
} else {
oneWire.skipROM(); // broadcast
}
}
bool OneWireEEPROM::WriteMemory(uint8_t* Source, uint16_t Address, uint8_t Size) {
uint8_t _ES; //store Endif Address , datastatus
uint8_t B;
if (Address<_memsize) {
uint8_t _TA1=(uint8_t)(Address & 0x00FF);
uint8_t _TA2=(uint8_t)((Address & 0xFF00)>>8);
if ((Size<=PAGESIZE) and ((Size+Address)<=_memsize)) {
// output.printf ("\r\nWriting to OneWireEEPROM %i Bytes",Size);
ResetAndAddress();
oneWire.writeByte(WRITESCRATCHPAD);
oneWire.writeByte(_TA1); //begin address T7..T0
oneWire.writeByte(_TA2); //begin address T15..T8
//write _memPage to scratchpad
for (int i = 0; i < Size; i++) {
oneWire.writeByte(Source[i]);
// output.printf ("%X ",Source[i]);
}
// output.printf ("\r\nTA1=%X",_TA1);
// output.printf ("\r\nTA2=%X\r\n",_TA2);
//read and check data in scratchpad
ResetAndAddress();
oneWire.writeByte(READSCRATCHPAD);
B=oneWire.readByte();
if (B != _TA1) { //check TA1, return if bad
output.printf("\r\nWrite error in TA1 %X - %X\r\n",B,_TA1);
return false;
}
B=oneWire.readByte();
if (B != _TA2) { //check TA2, return if bad
output.printf("\r\nWrite error in TA2 %X - %X\r\n",B,_TA2);
return false;
}
_ES = oneWire.readByte(); // ES Register
//check data written
for (int i = 0; i < Size; i++) {
B=oneWire.readByte();
if (B != Source[i]) { //return if bad
output.printf("\r\nWrite error in scratchpad on %i %X<->%X\r\n",i,B ,Source[i]);
return false;
}
}
// output.printf("\r\nES=%X\r\n",_ES);
//issue copy with auth data
wait_ms(10);
ResetAndAddress();
oneWire.writeByte(COPYSCRATCHPAD);
oneWire.writeByte(_TA1);
oneWire.writeByte(_TA2);
oneWire.writeByte(_ES); //pull-up!
wait_ms(10); //10ms min strong pullup delay -> time needed to copy from scratchpad to memory
oneWire.reset();
// output.printf ("\r\nData written\r\n");
return true;
} else {
output.printf ("\r\nTrying to write more then %i bytes-> %i\r\n",PAGESIZE,Size);
return false;
}
} else {
output.printf ("\r\nAddress %X not available, EEPROM isn't that bigg..-> %i\r\n",Address);
return false;
}
}
int OneWireEEPROM::ReadMemory(uint8_t* Destination, uint16_t Address, uint16_t Size) {
uint8_t tmpReader;
// bool readFF = 0;
int memPtr;
if (Address<_memsize) {
uint8_t _TA1=(uint8_t)(Address & 0x00FF);
uint8_t _TA2=(uint8_t)((Address & 0xFF00)>>8);
if ((Size+Address)<=_memsize) {
ResetAndAddress();
oneWire.writeByte(READMEMORY);
oneWire.writeByte(_TA1);
oneWire.writeByte(_TA2);
// output.printf ("\r\nReading... TA1=%X TA2=%X",_TA1, _TA2);
for (memPtr = 0; memPtr < Size; memPtr++) {
tmpReader = oneWire.readByte();
// if (tmpReader == 0xff & !readFF)
// readFF = 1;
// else if (tmpReader == 0xff & readFF)
// 0xff read twice, hopefully EoF as we break here :)
// break;
Destination[memPtr] = tmpReader;
}
// output.printf ("-> %i byte(s)\r\n",memPtr);
return memPtr;
} else {
output.printf ("\r\nTrying to read outside MEMORY -> %i\r\n",Address+Size);
return 0;
}
} else {
output.printf ("\r\nAddress %X not available, EEPROM isn't that bigg..-> %i\r\n",Address);
return 0;
}
}
void OneWireEEPROM::ShowMemory(int PageFrom, int PageTo) {
int Size;
int MemSize;
if (PageFrom<0)
PageFrom=0;
if (PageTo>=_pages)
PageTo=_pages-1;
if ((PageFrom>=0) and (PageFrom<_pages) and
(PageTo>=0) and (PageTo<_pages)) {
MemSize=(PageTo-PageFrom+1)*PAGESIZE;
uint8_t *MemAll = (uint8_t*) malloc(MemSize);
if (MemAll!=NULL) {
output.printf ("\r\nRead Page(s) from EEPROM %i to %i -> ", PageFrom,PageTo);
Size=ReadMemory(MemAll,PageFrom*PAGESIZE,MemSize);
output.printf("%i bytes\r\n ",Size);
for (int j=PageFrom;j<=PageTo;j++) {
output.printf ("\r\nPage %2i ->",j);
for (int i=0;i<PAGESIZE;i++) {
if ((j*32+i)<= Size)
output.printf("%2X ",MemAll[j*32+i]);
}
if ((j*32)>Size)
break;
}
output.printf ("\r\n");
free(MemAll);
} else
output.printf ("\r\nNOT enough memory to display EEPROM content !!\r\n");
}
}
bool OneWireEEPROM::WriteWord(uint16_t v, uint16_t Address) {
bool ok=false;
int it=0;
uint8_t Mem[2];
Mem[0]=(uint8_t)(v & 0x00FF);
Mem[1]=(uint8_t)((v & 0xFF00)>>8);
do {
ok=WriteMemory(Mem,Address,2);
it++;
} while ((ok==false) && (it<5));
if (it>1) {
output.printf (" EEPROM WriteWord %i times ->",it);
if (ok)
output.printf("ok\r\n");
else
output.printf("not ok\r\n");
}
return ok;
}
bool OneWireEEPROM::WriteByte(uint8_t b, uint16_t Address) {
bool ok=false;
int it=0;
uint8_t Mem[1];
Mem[0]=(uint8_t)(b & 0x00FF);
do {
ok=WriteMemory(Mem,Address,1);
it++;
} while ((ok==false) && (it<5));
if (it>1) {
output.printf (" EEPROM WriteByte %i times ->",it);
if (ok)
output.printf("ok\r\n");
else
output.printf("not ok\r\n");
}
return ok;
}
uint16_t OneWireEEPROM::ReadWord(uint16_t Address) {
int size;
int it=0;
uint8_t Mem[2];
do {
size=ReadMemory(Mem,Address,2);
it++;
} while ((size==0) && (it<5));
// output.printf ("%i %i \r\n",Mem[0],Mem[1]);
if (it>1) {
output.printf (" EEPROM ReadWord %i times ->",it);
if (size>0)
output.printf("ok\r\n");
else
output.printf("not ok\r\n");
}
return (uint16_t)Mem[0] + (uint16_t) (Mem[1]<<8);
}
uint8_t OneWireEEPROM::ReadByte(uint8_t Address) {
int size;
int it=0;
uint8_t Mem[1];
do {
size=ReadMemory(Mem,Address,1);
it++;
} while ((size==0) && (it<5));
// output.printf ("%i \r\n",Mem[0]);
if (it>1) {
output.printf (" EEPROM ReadByte %i times ->",it);
if (size>0)
output.printf("ok\r\n");
else
output.printf("not ok\r\n");
}
return (uint8_t) Mem[0];
}