mirror of
https://github.com/oliexdev/openScale.git
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initial commit microcontroller unit (mcu) arduino sketch for the custom bluetooth scale.
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OliE
212
arduino_mcu/libraries/I2C_eeprom/I2C_eeprom.cpp
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212
arduino_mcu/libraries/I2C_eeprom/I2C_eeprom.cpp
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//
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// FILE: I2C_eeprom.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 1.0.05
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// PURPOSE: Simple I2C_eeprom library for Arduino with EEPROM 24LC256 et al.
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//
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// HISTORY:
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// 0.1.00 - 2011-01-21 initial version
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// 0.1.01 - 2011-02-07 added setBlock function
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// 0.2.00 - 2011-02-11 fixed 64 bit boundary bug
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// 0.2.01 - 2011-08-13 _readBlock made more robust + return value
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// 1.0.00 - 2013-06-09 support for Arduino 1.0.x
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// 1.0.01 - 2013-11-01 fixed writeBlock bug, refactor
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// 1.0.02 - 2013-11-03 optimize internal buffers, refactor
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// 1.0.03 - 2013-11-03 refactor 5 millis() write-latency
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// 1.0.04 - 2013-11-03 fix bug in readBlock, moved waitEEReady() -> more efficient.
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// 1.0.05 - 2013-11-06 improved waitEEReady(), added determineSize()
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//
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// Released to the public domain
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//
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#include <I2C_eeprom.h>
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I2C_eeprom::I2C_eeprom(uint8_t device)
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{
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_deviceAddress = device;
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Wire.begin();
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_lastWrite = 0;
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TWBR = 12; // 12=400Khz 32=200 72=100 152=50 F_CPU/16+(2*TWBR)
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}
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int I2C_eeprom::writeByte(uint16_t address, uint8_t data)
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{
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int rv = _WriteBlock(address, &data, 1);
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return rv;
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}
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int I2C_eeprom::setBlock(uint16_t address, uint8_t data, uint16_t length)
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{
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uint8_t buffer[I2C_TWIBUFFERSIZE];
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for (uint8_t i =0; i< I2C_TWIBUFFERSIZE; i++) buffer[i] = data;
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int rv = _pageBlock(address, buffer, length, false); // todo check return value..
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return rv;
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}
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int I2C_eeprom::writeBlock(uint16_t address, uint8_t* buffer, uint16_t length)
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{
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int rv = _pageBlock(address, buffer, length, true); // todo check return value..
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return rv;
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}
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uint8_t I2C_eeprom::readByte(uint16_t address)
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{
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uint8_t rdata;
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_ReadBlock(address, &rdata, 1);
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return rdata;
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}
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uint16_t I2C_eeprom::readBlock(uint16_t address, uint8_t* buffer, uint16_t length)
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{
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uint16_t rv = 0;
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while (length > 0)
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{
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uint8_t cnt = min(length, I2C_TWIBUFFERSIZE);
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rv += _ReadBlock(address, buffer, cnt);
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address += cnt;
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buffer += cnt;
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length -= cnt;
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}
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return rv;
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}
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#ifdef I2C_EEPROM_EXTENDED
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// returns 64, 32, 16, 8, 4, 2, 1, 0
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// 0 is smaller than 1K
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uint8_t I2C_eeprom::determineSize()
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{
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uint8_t rv = 0; // unknown
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uint8_t orgValues[8];
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uint16_t addr;
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// remember old values, non destructive
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for (uint8_t i=0; i<8; i++)
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{
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addr = (512 << i) + 1;
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orgValues[i] = readByte(addr);
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}
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// scan page folding
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for (uint8_t i=0; i<8; i++)
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{
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rv = i;
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uint16_t addr1 = (512 << i) + 1;
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uint16_t addr2 = (512 << (i+1)) + 1;
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writeByte(addr1, 0xAA);
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writeByte(addr2, 0x55);
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if (readByte(addr1) == 0x55) // folded!
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{
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break;
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}
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}
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// restore original values
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for (uint8_t i=0; i<8; i++)
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{
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uint16_t addr = (512 << i) + 1;
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writeByte(addr, orgValues[i]);
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}
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return 0x01 << (rv-1);
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}
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#endif
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////////////////////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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// _pageBlock aligns buffer to page boundaries for writing.
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// and to TWI buffer size
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// returns 0 = OK otherwise error
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int I2C_eeprom::_pageBlock(uint16_t address, uint8_t* buffer, uint16_t length, bool incrBuffer)
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{
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int rv = 0;
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while (length > 0)
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{
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uint8_t bytesUntilPageBoundary = I2C_EEPROM_PAGESIZE - address%I2C_EEPROM_PAGESIZE;
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uint8_t cnt = min(length, bytesUntilPageBoundary);
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cnt = min(cnt, I2C_TWIBUFFERSIZE);
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int rv = _WriteBlock(address, buffer, cnt); // todo check return value..
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if (rv != 0) return rv;
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address += cnt;
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if (incrBuffer) buffer += cnt;
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length -= cnt;
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}
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return rv;
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}
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// pre: length <= I2C_EEPROM_PAGESIZE && length <= I2C_TWIBUFFERSIZE;
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// returns 0 = OK otherwise error
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int I2C_eeprom::_WriteBlock(uint16_t address, uint8_t* buffer, uint8_t length)
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{
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waitEEReady();
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Wire.beginTransmission(_deviceAddress);
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#if defined(ARDUINO) && ARDUINO >= 100
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Wire.write((int)(address >> 8));
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Wire.write((int)(address & 0xFF));
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for (uint8_t cnt = 0; cnt < length; cnt++)
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Wire.write(buffer[cnt]);
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#else
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Wire.send((int)(address >> 8));
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Wire.send((int)(address & 0xFF));
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for (uint8_t cnt = 0; cnt < length; cnt++)
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Wire.send(buffer[cnt]);
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#endif
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int rv = Wire.endTransmission();
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_lastWrite = micros();
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return rv;
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}
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// pre: buffer is large enough to hold length bytes
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// returns bytes written
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uint8_t I2C_eeprom::_ReadBlock(uint16_t address, uint8_t* buffer, uint8_t length)
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{
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waitEEReady();
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Wire.beginTransmission(_deviceAddress);
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#if defined(ARDUINO) && ARDUINO >= 100
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Wire.write((int)(address >> 8));
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Wire.write((int)(address & 0xFF));
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#else
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Wire.send((int)(address >> 8));
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Wire.send((int)(address & 0xFF));
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#endif
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int rv = Wire.endTransmission();
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if (rv != 0) return 0; // error
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Wire.requestFrom(_deviceAddress, length);
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uint8_t cnt = 0;
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uint32_t before = millis();
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while ((cnt < length) && ((millis() - before) < I2C_EEPROM_TIMEOUT))
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{
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#if defined(ARDUINO) && ARDUINO >= 100
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if (Wire.available()) buffer[cnt++] = Wire.read();
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#else
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if (Wire.available()) buffer[cnt++] = Wire.receive();
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#endif
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}
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return cnt;
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}
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void I2C_eeprom::waitEEReady()
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{
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#define I2C_WRITEDELAY 5000
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// Wait until EEPROM gives ACK again.
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// this is a bit faster than the hardcoded 5 milli
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while ((micros() - _lastWrite) <= I2C_WRITEDELAY)
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{
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Wire.beginTransmission(_deviceAddress);
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int x = Wire.endTransmission();
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if (x == 0) break;
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}
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}
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//
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// END OF FILE
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//
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67
arduino_mcu/libraries/I2C_eeprom/I2C_eeprom.h
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67
arduino_mcu/libraries/I2C_eeprom/I2C_eeprom.h
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@@ -0,0 +1,67 @@
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#ifndef I2C_EEPROM_H
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#define I2C_EEPROM_H
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//
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// FILE: I2C_eeprom.h
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// AUTHOR: Rob Tillaart
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// PURPOSE: Simple I2C_eeprom library for Arduino with EEPROM 24LC256 et al.
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// VERSION: 1.0.05
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// HISTORY: See I2C_eeprom.cpp
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// URL: http://arduino.cc/playground/Main/LibraryForI2CEEPROM
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//
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// Released to the public domain
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//
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#include <Wire.h>
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#include "Wstring.h"
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#include "Wiring.h"
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#endif
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#define I2C_EEPROM_VERSION "1.0.05"
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// I2C_EEPROM_PAGESIZE must be multiple of 2 e.g. 16, 32 or 64
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// 24LC256 -> 64 bytes
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#define I2C_EEPROM_PAGESIZE 64
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// TWI buffer needs max 2 bytes for address
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#define I2C_TWIBUFFERSIZE 30
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// to break blocking read/write
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#define I2C_EEPROM_TIMEOUT 1000
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// comment next line to keep lib small
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#define I2C_EEPROM_EXTENDED
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class I2C_eeprom
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{
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public:
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I2C_eeprom(uint8_t deviceAddress);
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int writeByte(uint16_t address, uint8_t value);
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int writeBlock(uint16_t address, uint8_t* buffer, uint16_t length);
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int setBlock(uint16_t address, uint8_t value, uint16_t length);
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uint8_t readByte(uint16_t address);
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uint16_t readBlock(uint16_t address, uint8_t* buffer, uint16_t length);
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#ifdef I2C_EEPROM_EXTENDED
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uint8_t determineSize();
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#endif
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private:
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uint8_t _deviceAddress;
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uint32_t _lastWrite; // for waitEEReady
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int _pageBlock(uint16_t address, uint8_t* buffer, uint16_t length, bool incrBuffer);
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int _WriteBlock(uint16_t address, uint8_t* buffer, uint8_t length);
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uint8_t _ReadBlock(uint16_t address, uint8_t* buffer, uint8_t length);
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void waitEEReady();
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};
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#endif
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// END OF FILE
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