mirror of
https://github.com/RobTillaart/Arduino.git
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280 lines
6.4 KiB
C++
280 lines
6.4 KiB
C++
//
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// FILE: I2C_24LC1025.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.4
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// PURPOSE: I2C_24LC1025 library for Arduino with EEPROM I2C_24LC1025 et al.
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//
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// HISTORY:
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// 0.1.0 2019-12-11 initial version (not tested)
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// 0.1.1 2021-01-20 major redo
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// 0.1.2 2021-01-31 fix reading over 64K block border
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// 0.1.3 2021-02-02 add updateBlock();
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// 0.1.4 2021-05-27 fix library.properties;
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#include "I2C_24LC1025.h"
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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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#if defined(ESP32) || defined(ESP8266)
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#define I2C_BUFFERSIZE 128
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#else
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#define I2C_BUFFERSIZE 30 // AVR, STM
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#endif
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////////////////////////////////////////////////////////////////////
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//
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// PUBLIC FUNCTIONS
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//
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I2C_24LC1025::I2C_24LC1025(uint8_t deviceAddress, TwoWire * wire)
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{
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_deviceAddress = deviceAddress;
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_deviceSize = I2C_DEVICESIZE_24LC512;
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_pageSize = I2C_24LC1025_PAGESIZE;
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_wire = wire;
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}
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#if defined (ESP8266) || defined(ESP32)
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bool I2C_24LC1025::begin(uint8_t sda, uint8_t scl)
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{
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if ((sda < 255) && (scl < 255))
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{
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_wire->begin(sda, scl);
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}
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else
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{
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_wire->begin();
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}
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_lastWrite = 0;
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return isConnected();
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}
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#endif
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bool I2C_24LC1025::begin()
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{
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_wire->begin();
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_lastWrite = 0;
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return isConnected();
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}
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bool I2C_24LC1025::isConnected()
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{
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_wire->beginTransmission(_deviceAddress);
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return (_wire->endTransmission() == 0);
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}
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int I2C_24LC1025::writeByte(const uint32_t memoryAddress, const uint8_t value)
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{
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int rv = _WriteBlock(memoryAddress, &value, 1);
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return rv;
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}
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int I2C_24LC1025::setBlock(const uint32_t memoryAddress, const uint8_t data, const uint32_t length)
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{
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uint8_t buffer[I2C_BUFFERSIZE];
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for (uint8_t i = 0; i < I2C_BUFFERSIZE; i++)
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{
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buffer[i] = data;
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}
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int rv = _pageBlock(memoryAddress, buffer, length, false);
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return rv;
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}
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int I2C_24LC1025::writeBlock(const uint32_t memoryAddress, const uint8_t* buffer, const uint32_t length)
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{
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int rv = _pageBlock(memoryAddress, buffer, length, true);
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return rv;
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}
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uint8_t I2C_24LC1025::readByte(const uint32_t memoryAddress)
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{
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uint8_t rdata;
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_ReadBlock(memoryAddress, &rdata, 1);
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return rdata;
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}
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uint32_t I2C_24LC1025::readBlock(const uint32_t memoryAddress, uint8_t* buffer, const uint32_t length)
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{
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uint32_t addr = memoryAddress;
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uint32_t len = length;
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uint32_t rv = 0;
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if ((addr < 0x10000) && ((addr + len) > 0x10000))
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{
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uint32_t sublen = 0x10000 - addr;
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rv = readBlock(addr, (uint8_t *) buffer, sublen);
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rv += readBlock(0x10000, (uint8_t *) &buffer[sublen], len - sublen);
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return rv;
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}
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while (len > 0)
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{
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uint8_t cnt = I2C_BUFFERSIZE;
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if (cnt > len) cnt = len;
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rv += _ReadBlock(addr, buffer, cnt);
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addr += cnt;
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buffer += cnt;
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len -= cnt;
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yield(); // For OS scheduling etc
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}
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return rv;
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}
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int I2C_24LC1025::updateByte(const uint32_t memoryAddress, const uint8_t data)
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{
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if (data == readByte(memoryAddress)) return 0;
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return writeByte(memoryAddress, data);
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}
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int I2C_24LC1025::updateBlock(const uint32_t memoryAddress, const uint8_t* buffer, const uint32_t length)
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{
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uint32_t addr = memoryAddress;
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uint32_t len = length;
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uint32_t rv = 0;
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while (len > 0)
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{
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uint8_t buf[I2C_BUFFERSIZE];
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uint8_t cnt = I2C_BUFFERSIZE;
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if (cnt > len) cnt = len;
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rv += _ReadBlock(addr, buf, cnt);
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if (memcmp(buffer, buf, cnt) != 0)
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{
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_pageBlock(addr, buffer, cnt, true);
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}
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addr += cnt;
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buffer += cnt;
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len -= cnt;
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yield(); // For OS scheduling etc
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}
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return rv;
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}
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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_24LC1025::_pageBlock(uint32_t memoryAddress, const uint8_t * buffer, const uint16_t length, const bool incrBuffer)
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{
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uint32_t addr = memoryAddress;
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uint16_t len = length;
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while (len > 0)
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{
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uint8_t bytesUntilPageBoundary = this->_pageSize - addr % this->_pageSize;
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uint8_t cnt = I2C_BUFFERSIZE;
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if (cnt > len) cnt = len;
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if (cnt > bytesUntilPageBoundary) cnt = bytesUntilPageBoundary;
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int rv = _WriteBlock(addr, buffer, cnt);
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if (rv != 0) return rv;
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addr += cnt;
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if (incrBuffer) buffer += cnt;
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len -= cnt;
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}
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return 0;
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}
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void I2C_24LC1025::_beginTransmission(uint32_t memoryAddress)
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{
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// chapter 5+6 - datasheet - need three bytes for address
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_actualAddress = _deviceAddress;
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if (memoryAddress >= 0x10000) _actualAddress |= 0x04; // addresbit 16
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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 milliSeconds // chapter 7
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while ( (micros() - _lastWrite) <= I2C_WRITEDELAY )
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{
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_wire->beginTransmission(_actualAddress);
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if (_wire->endTransmission() == 0) break;
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yield();
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delayMicroseconds(50);
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}
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uint16_t memAddr = (memoryAddress & 0xFFFF);
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_wire->beginTransmission(_actualAddress); // device addres + bit 16
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_wire->write((memAddr >> 8) & 0xFF); // highByte
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_wire->write(memAddr & 0xFF); // lowByte
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}
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// pre: length <= this->_pageSize && length <= I2C_BUFFERSIZE;
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// returns 0 = OK otherwise error
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int I2C_24LC1025::_WriteBlock(uint32_t memoryAddress, const uint8_t* buffer, const uint8_t length)
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{
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yield();
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this->_beginTransmission(memoryAddress);
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_wire->write(buffer, length);
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int rv = _wire->endTransmission();
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_lastWrite = micros();
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if (rv != 0)
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{
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if (_debug)
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{
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Serial.print("mem addr w: ");
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Serial.print(memoryAddress, HEX);
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Serial.print("\t");
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Serial.println(rv);
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}
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return -(abs(rv)); // error
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}
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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 read
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int I2C_24LC1025::_ReadBlock(uint32_t memoryAddress, uint8_t* buffer, const uint8_t length)
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{
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yield();
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this->_beginTransmission(memoryAddress);
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int rv = _wire->endTransmission();
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if (rv != 0)
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{
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if (_debug)
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{
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Serial.print("mem addr r: ");
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Serial.print(memoryAddress, HEX);
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Serial.print("\t");
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Serial.println(rv);
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}
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return -(abs(rv)); // error
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}
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// readbytes will always be equal or smaller to length
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uint8_t readBytes = _wire->requestFrom(_actualAddress, length);
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uint8_t cnt = 0;
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while (cnt < readBytes)
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{
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buffer[cnt++] = _wire->read();
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yield();
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}
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return readBytes;
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}
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// -- END OF FILE --
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