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王立帮
271
arduino-cli/libraries/AT24Cx_Soft/AT24CX_Soft.cpp
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271
arduino-cli/libraries/AT24Cx_Soft/AT24CX_Soft.cpp
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/**
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AT24CX_Soft.cpp
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Library for using the EEPROM AT24C32/64
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Copyright (c) 2014 Christian Paul
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "AT24CX_Soft.h"
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#include <SoftwareWire.h>
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/**
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* Constructor with AT24Cx EEPROM at given index and size of page
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*/
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AT24CX_Soft::AT24CX_Soft(byte index, byte pageSize, SoftwareWire *theWire) {
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init(index, pageSize, theWire);
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}
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/**
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* Init
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*/
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void AT24CX_Soft::init(byte index, byte pageSize, SoftwareWire *theWire) {
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_wire = theWire;
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_id = AT24CX_Soft_ID | (index & 0x7);
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_pageSize = pageSize;
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_wire->begin();
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}
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/**
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* Write byte
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*/
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void AT24CX_Soft::write(unsigned int address, byte data) {
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/*
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if(_pageSize >= 32 || _pageSize <= 8)
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_wire->beginTransmission(_id);
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else
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_wire->beginTransmission((byte)(_id | ((address >> 8) & 0x07)));
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if(_wire->endTransmission()==0) {
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if(_pageSize >= 32)
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{
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_wire->beginTransmission(_id);
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_wire->write(address >> 8);
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_wire->write(address & 0xFF);
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}
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else if(_pageSize >= 16)
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{
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_wire->beginTransmission((byte)(_id | ((address >> 8) & 0x07)));
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_wire->write(address & 0xFF);
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}
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else
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{
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_wire->beginTransmission(_id);
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_wire->write(address);
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}
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*/
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connect(address);
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_wire->write(data);
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_wire->endTransmission();
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delay(10);
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}
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/**
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* Write integer
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*/
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void AT24CX_Soft::writeInt(unsigned int address, unsigned int data) {
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write(address, (byte*)&data, 2);
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}
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/**
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* Write long
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*/
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void AT24CX_Soft::writeLong(unsigned int address, unsigned long data) {
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write(address, (byte*)&data, 4);
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}
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/**
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* Write float
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*/
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void AT24CX_Soft::writeFloat(unsigned int address, float data) {
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write(address, (byte*)&data, 4);
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}
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/**
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* Write double
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*/
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void AT24CX_Soft::writeDouble(unsigned int address, double data) {
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write(address, (byte*)&data, 8);
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}
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/**
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* Write chars
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*/
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void AT24CX_Soft::writeChars(unsigned int address, char *data, int length) {
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write(address, (byte*)data, length);
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}
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/**
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* Read integer
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*/
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unsigned int AT24CX_Soft::readInt(unsigned int address) {
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read(address, _b, 2);
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return *(unsigned int*)&_b[0];
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}
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/**
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* Read long
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*/
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unsigned long AT24CX_Soft::readLong(unsigned int address) {
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read(address, _b, 4);
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return *(unsigned long*)&_b[0];
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}
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/**
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* Read float
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*/
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float AT24CX_Soft::readFloat(unsigned int address) {
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read(address, _b, 4);
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return *(float*)&_b[0];
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}
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/**
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* Read double
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*/
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double AT24CX_Soft::readDouble(unsigned int address) {
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read(address, _b, 8);
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return *(double*)&_b[0];
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}
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/**
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* Read chars
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*/
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void AT24CX_Soft::readChars(unsigned int address, char *data, int n) {
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read(address, (byte*)data, n);
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}
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/**
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* Write sequence of n bytes
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*/
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void AT24CX_Soft::write(unsigned int address, byte *data, int n) {
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// status quo
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int c = n; // bytes left to write
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int offD = 0; // current offset in data pointer
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int offP; // current offset in page
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int nc = 0; // next n bytes to write
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// write alle bytes in multiple steps
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while (c > 0) {
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// calc offset in page
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offP = address % _pageSize;
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// maximal 30 bytes to write
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nc = min(min(c, 30), _pageSize - offP);
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write(address, data, offD, nc);
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c-=nc;
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offD+=nc;
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address+=nc;
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}
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}
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/**
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* Write sequence of n bytes from offset
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*/
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void AT24CX_Soft::write(unsigned int address, byte *data, int offset, int n) {
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/*
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_wire->beginTransmission(_id);
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if (_wire->endTransmission()==0) {
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_wire->beginTransmission(_id);
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if(_pageSize >= 32)
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{
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_wire->write(address >> 8);
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_wire->write(address & 0xFF);
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}
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else
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{
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_wire->write(address);
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}
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*/
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connect(address);
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byte *adr = data+offset;
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_wire->write(adr, n);
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_wire->endTransmission();
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delay(10);
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}
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/**
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* Read byte
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*/
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byte AT24CX_Soft::read(unsigned int address) {
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byte b = 0;
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int r = 0;
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connect(address);
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if (_wire->endTransmission()==0) {
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_wire->requestFrom(_id, 1);
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while (_wire->available() > 0 && r<1) {
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b = (byte)_wire->read();
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r++;
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}
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}
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return b;
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}
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/**
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* Read sequence of n bytes
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*/
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void AT24CX_Soft::read(unsigned int address, byte *data, int n) {
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int c = n;
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int offD = 0;
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// read until are n bytes read
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while (c > 0) {
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// read maximal 32 bytes
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int nc = c;
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if (nc > 32)
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nc = 32;
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read(address, data, offD, nc);
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address+=nc;
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offD+=nc;
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c-=nc;
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}
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}
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/**
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* Read sequence of n bytes to offset
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*/
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void AT24CX_Soft::read(unsigned int address, byte *data, int offset, int n) {
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connect(address);
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if (_wire->endTransmission()==0) {
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int r = 0;
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_wire->requestFrom(_id, n);
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while (_wire->available() > 0 && r<n) {
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data[offset+r] = (byte)_wire->read();
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r++;
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}
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}
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}
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void AT24CX_Soft::connect(unsigned int address) {
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if(_pageSize >= 32)
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{
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_wire->beginTransmission(_id);
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_wire->write(address >> 8);
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_wire->write(address & 0xFF);
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}
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else if(_pageSize >= 16)
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{
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_wire->beginTransmission((byte)(_id | ((address >> 8) & 0x07)));
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_wire->write(address & 0xFF);
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}
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else
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{
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_wire->beginTransmission(_id);
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_wire->write(address);
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}
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}
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