mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-09-19 16:46:11 -04:00
+ 1.1.00 breaking interface
+ begin() addded, needs to be called before use - e.g. in setup() - + faster block Wire.Write() + removed int casting + updated and removed comments + updated test sketch
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@ -1,8 +1,8 @@
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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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// VERSION: 1.1.00
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// PURPOSE: 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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@ -13,8 +13,13 @@
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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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// 1.0.04 - 2013-11-03 fix bug in readBlock, moved waitEEReady()
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// -> more efficient.
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// 1.0.05 - 2013-11-06 improved waitEEReady(),
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// added determineSize()
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// 1.1.00 - 2013-11-13 added begin() function (Note breaking interface)
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// use faster block Wire.write()
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// int casting removed
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//
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// Released to the public domain
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//
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@ -24,9 +29,16 @@
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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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}
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void I2C_eeprom::begin()
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{
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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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TWBR = 72;
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// 0=1000 1=888 2=800 8=500
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// 12=400KHz 24=250 32=200 72=100 152=50
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// F_CPU/16+(2*TWBR) // TWBR is a uint8_t
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}
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int I2C_eeprom::writeByte(uint16_t address, uint8_t data)
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@ -40,13 +52,13 @@ int I2C_eeprom::setBlock(uint16_t address, uint8_t data, uint16_t length)
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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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int rv = _pageBlock(address, buffer, length, false);
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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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int rv = _pageBlock(address, buffer, length, true);
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return rv;
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}
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@ -57,7 +69,6 @@ uint8_t I2C_eeprom::readByte(uint16_t address)
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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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@ -125,11 +136,11 @@ int I2C_eeprom::_pageBlock(uint16_t address, uint8_t* buffer, uint16_t length, b
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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 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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int rv = _WriteBlock(address, buffer, cnt);
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if (rv != 0) return rv;
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address += cnt;
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@ -147,35 +158,32 @@ int I2C_eeprom::_WriteBlock(uint16_t address, uint8_t* buffer, uint8_t length)
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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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Wire.write(address >> 8);
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Wire.write(address & 0xFF);
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Wire.write(buffer, length);
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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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Wire.send(address >> 8);
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Wire.send(address & 0xFF);
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Wire.send(buffer, length);
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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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// returns bytes read
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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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Wire.write(address >> 8);
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Wire.write(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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Wire.send(address >> 8);
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Wire.send(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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@ -199,7 +207,7 @@ void I2C_eeprom::waitEEReady()
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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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// this is a bit faster than the hardcoded 5 milliSeconds
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while ((micros() - _lastWrite) <= I2C_WRITEDELAY)
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{
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Wire.beginTransmission(_deviceAddress);
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@ -208,6 +216,4 @@ void I2C_eeprom::waitEEReady()
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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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// END OF FILE
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@ -3,8 +3,8 @@
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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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// PURPOSE: I2C_eeprom library for Arduino with EEPROM 24LC256 et al.
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// VERSION: 1.1.00
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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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@ -21,16 +21,17 @@
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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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#define I2C_EEPROM_VERSION "1.1.00"
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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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// TWI buffer needs max 2 bytes for eeprom address
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// 1 byte for eeprom register address is available in txbuffer
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#define I2C_TWIBUFFERSIZE 30
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// to break blocking read/write
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// to break blocking read/write after n millis()
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#define I2C_EEPROM_TIMEOUT 1000
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// comment next line to keep lib small
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@ -41,6 +42,7 @@ class I2C_eeprom
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public:
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I2C_eeprom(uint8_t deviceAddress);
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void begin();
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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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@ -1,7 +1,7 @@
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//
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// FILE: I2C_eeprom_test.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.05
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// VERSION: 0.1.06
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// PURPOSE: show/test I2C_EEPROM library
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//
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@ -10,8 +10,12 @@
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I2C_eeprom ee(0x50);
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uint32_t totals = 0;
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void setup()
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{
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ee.begin();
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Serial.begin(115200);
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Serial.print("Demo I2C eeprom library ");
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Serial.print(I2C_EEPROM_VERSION);
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@ -69,12 +73,14 @@ void setup()
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Serial.println(TWBR);
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Serial.println();
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totals = 0;
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Serial.print("\nTEST: timing writeByte()\t");
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uint32_t start = micros();
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ee.writeByte(10, 1);
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uint32_t diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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Serial.print("TEST: timing writeBlock(50)\t");
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start = micros();
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@ -82,6 +88,7 @@ void setup()
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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Serial.print("TEST: timing readByte()\t\t");
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start = micros();
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@ -89,6 +96,7 @@ void setup()
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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Serial.print("TEST: timing readBlock(50)\t");
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start = micros();
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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Serial.print("TOTALS: ");
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Serial.println(totals);
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totals = 0;
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// same tests but now with a 5 millisec delay in between.
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delay(5);
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@ -106,6 +119,7 @@ void setup()
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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delay(5);
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@ -115,6 +129,7 @@ void setup()
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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delay(5);
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@ -124,6 +139,7 @@ void setup()
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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delay(5);
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@ -133,11 +149,15 @@ void setup()
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diff = micros() - start;
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Serial.print("TIME: ");
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Serial.println(diff);
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totals += diff;
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Serial.print("TOTALS: ");
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Serial.println(totals);
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totals = 0;
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// does it go well?
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Serial.println(xx);
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Serial.println("\nTEST: determine size");
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start = micros();
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int size = ee.determineSize();
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@ -147,18 +167,14 @@ void setup()
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Serial.print("SIZE: ");
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Serial.print(size);
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Serial.println(" KB");
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Serial.println("\tDone...");
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}
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void loop()
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{
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}
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void dumpEEPROM(uint16_t addr, uint16_t length)
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{
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// block to 10
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