This class provides simplified I2C access to a Microchip 24LCxx Serial EEPROM device: - Rename the class (C2424 -> C24) - Add EraseMemoryArea method - Add DumpMemoryArea method only accessible in DEBUG mode - Add 'const' qualifier in parameters
Fork of 24LCxx_I2C by
24LCxx_I2C.cpp
- Committer:
- acesrobertm
- Date:
- 2017-09-25
- Revision:
- 3:5df584fbabfe
- Parent:
- 2:16ce7dae9019
- Child:
- 4:650f3259bd4f
File content as of revision 3:5df584fbabfe:
/* mbed simplified access to Microchip 24LCxx Serial EEPROM devices (I2C) * Copyright (c) 2010-2012 ygarcia, MIT License * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software * and associated documentation files (the "Software"), to deal in the Software without restriction, * including without limitation the rights to use, copy, modify, merge, publish, distribute, * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or * substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <iostream> #include <sstream> #include "24LCxx_I2C.h" namespace _24LCXX_I2C { unsigned char C24LCXX_I2C::I2CModuleRefCounter = 0; C24LCXX_I2C::C24LCXX_I2C(const PinName p_sda, const PinName p_scl, const unsigned char p_address, const PinName p_wp, const unsigned int p_frequency) : _internalId("") { if (C24LCXX_I2C::I2CModuleRefCounter != 0) { error("C24LCXX_I2C: Wrong params"); } #ifdef __DEBUG std::ostringstream out(std::ostringstream::out); out << "C24LCXX_I2C #" << C24LCXX_I2C::I2CModuleRefCounter; _internalId.assign(out.str()); DEBUG("C24LCXX_I2C: _internalId='%s'", _internalId.c_str()) #endif // __DEBUG _i2cInstance = new I2C(p_sda, p_scl); //, "24LCxx_I2C" C24LCXX_I2C::I2CModuleRefCounter += 1; _slaveAddress = (p_address << 1) | 0xa0; // Slave address format is: 1 0 1 0 A3 A2 A1 R/W _i2cInstance->frequency(p_frequency); // Set the frequency of the I2C interface if (p_wp != NC) { _wp = new DigitalOut(p_wp); _wp->write(0); // Disable write protect } else { _wp = NULL; // Not used } } C24LCXX_I2C::~C24LCXX_I2C() { // Release I2C instance C24LCXX_I2C::I2CModuleRefCounter -= 1; if (C24LCXX_I2C::I2CModuleRefCounter == 0) { delete _i2cInstance; _i2cInstance = NULL; } // Release _wp if required if (_wp != NULL) { _wp->write(0); delete _wp; } } bool C24LCXX_I2C::WriteProtect(const bool p_writeProtect) { if (_wp != NULL) { _wp->write((int)(p_writeProtect)); return true; } return false; } bool C24LCXX_I2C::EraseMemoryArea(const short p_startAddress, const int p_count, const unsigned char p_pattern) { std::vector<unsigned char> eraseBuffer(p_count, p_pattern); return Write(p_startAddress, eraseBuffer, false); } bool C24LCXX_I2C::Write(const short p_address, const unsigned char p_byte) { // 1.Prepare buffer char i2cBuffer[3]; // Memory address + one byte of data // 1.1. Memory address short address = p_address; i2cBuffer[0] = (unsigned char)(address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)address & 0xff); // 1.2. Datas i2cBuffer[2] = p_byte; // 2. Send I2C start + I2C address + Memory Address + Datas + I2C stop int result = _i2cInstance->write(_slaveAddress, i2cBuffer, 3); wait(0.02); return (bool)(result == 0); } bool C24LCXX_I2C::Write(const short p_address, const short p_short, const C24LCXX_I2C::Mode p_mode) { // 1.Prepare buffer char i2cBuffer[4]; // Memory address + one short (2 bytes) // 1.1. Memory address short address = p_address; i2cBuffer[0] = (unsigned char)(address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)address & 0xff); // 1.2. Datas if (p_mode == BigEndian) { i2cBuffer[2] = (unsigned char)(p_short >> 8); i2cBuffer[3] = (unsigned char)((unsigned char)p_short & 0xff); } else { i2cBuffer[2] = (unsigned char)((unsigned char)p_short & 0xff); i2cBuffer[3] = (unsigned char)(p_short >> 8); } // 2. Send I2C start + I2C address + Memory Address + Datas + I2C stop int result = _i2cInstance->write(_slaveAddress, i2cBuffer, 4); wait(0.02); return (bool)(result == 0); } bool C24LCXX_I2C::Write(const short p_address, const int p_int, const C24LCXX_I2C::Mode p_mode) { // 1.Prepare buffer char i2cBuffer[6]; // Memory address + one integer (4 bytes) // 1.1. Memory address short address = p_address; i2cBuffer[0] = (unsigned char)(address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)address & 0xff); // 1.2. Datas if (p_mode == BigEndian) { i2cBuffer[2] = (unsigned char)(p_int >> 24); i2cBuffer[3] = (unsigned char)(p_int >> 16); i2cBuffer[4] = (unsigned char)(p_int >> 8); i2cBuffer[5] = (unsigned char)((unsigned char)p_int & 0xff); } else { i2cBuffer[2] = (unsigned char)((unsigned char)p_int & 0xff); i2cBuffer[3] = (unsigned char)(p_int >> 8); i2cBuffer[4] = (unsigned char)(p_int >> 16); i2cBuffer[5] = (unsigned char)(p_int >> 24); } // 2. Send I2C start + I2C address + Memory Address + Datas + I2C stop int result = _i2cInstance->write(_slaveAddress, i2cBuffer, 6); wait(0.02); return (bool)(result == 0); } bool C24LCXX_I2C::Write(const short p_address, const std::string & p_string, const bool p_storeLength, const int p_length2write) { return Write(p_address, p_string.c_str(), p_storeLength, p_length2write); } bool C24LCXX_I2C::Write(const short p_address, const std::vector<unsigned char> & p_datas, const bool p_storeLength, const int p_length2write) { int length = (p_length2write == -1) ? p_datas.size() : p_length2write; unsigned char array[length]; std::copy(p_datas.begin(), p_datas.end(), array); bool result = Write(p_address, array, p_storeLength, length); wait(0.02); return result; } bool C24LCXX_I2C::Write(const short p_address, const char *p_datas, const bool p_storeLength, const int p_length2write) { // 1.Prepare buffer int length = (p_length2write == -1) ? strlen(p_datas) : p_length2write; if (p_storeLength) { length += 4; // Add four bytes for the length as integer } char i2cBuffer[2 + length]; // 1.1. Memory address short address = p_address; i2cBuffer[0] = (unsigned char)(address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)address & 0xff); // 1.2. Datas if (p_storeLength) { // Fill the length i2cBuffer[2] = (unsigned char)(length >> 24); i2cBuffer[3] = (unsigned char)(length >> 16); i2cBuffer[4] = (unsigned char)(length >> 8); i2cBuffer[5] = (unsigned char)((unsigned char)length & 0xff); for (int i = 0; i < length - 4; i++) { i2cBuffer[6 + i] = *(p_datas + i); } } else { // The length was not stored for (int i = 0; i < length; i++) { i2cBuffer[2 + i] = *(p_datas + i); } } // 2. Send I2C start + I2C address + Memory Address + Datas + I2C stop int result = _i2cInstance->write(_slaveAddress, i2cBuffer, 2 + length); wait(0.02); return (bool)(result == 0); } bool C24LCXX_I2C::Write(const short p_address, const unsigned char *p_datas, const bool p_storeLength, const int p_length2write) { return Write(p_address, (const char *)p_datas, p_storeLength, p_length2write); } bool C24LCXX_I2C::Read(const short p_address, unsigned char * p_byte) { // 1.Prepare buffer char i2cBuffer[2]; // 1.1. Memory address i2cBuffer[0] = (unsigned char)(p_address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)p_address & 0xff); // 2. Send I2C start + memory address if (_i2cInstance->write(_slaveAddress, i2cBuffer, 2, true) == 0) { // 2. Read data + I2C stop int result = _i2cInstance->read(_slaveAddress, (char *)p_byte, 1); return (bool)(result == 0); } return false; } bool C24LCXX_I2C::Read(const short p_address, short *p_short, const C24LCXX_I2C::Mode p_mode) { // 1.Prepare buffer char i2cBuffer[2]; // 1.1. Memory address i2cBuffer[0] = (unsigned char)(p_address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)p_address & 0xff); // 2. Send I2C start + memory address if (_i2cInstance->write(_slaveAddress, i2cBuffer, 2, true) == 0) { // 2. Read data + I2C stop int result = _i2cInstance->read(_slaveAddress, i2cBuffer, 2); if (result == 0) { if (p_mode == BigEndian) { *p_short = (short)(i2cBuffer[0] << 8 | i2cBuffer[1]); } else { *p_short = (short)(i2cBuffer[1] << 8 | i2cBuffer[0]); } return true; } } return false; } bool C24LCXX_I2C::Read(const short p_address, int *p_int, const C24LCXX_I2C::Mode p_mode) { // 1.Prepare buffer char i2cBuffer[4]; // 1.1. Memory address i2cBuffer[0] = (unsigned char)(p_address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)p_address & 0xff); // 2. Send I2C start + memory address if (_i2cInstance->write(_slaveAddress, i2cBuffer, 2, true) == 0) { // 2. Read data + I2C stop int result = _i2cInstance->read(_slaveAddress, i2cBuffer, 4); if (result == 0) { if (p_mode == BigEndian) { *p_int = (int)(i2cBuffer[0] << 24 | i2cBuffer[1] << 16 | i2cBuffer[2] << 8 | i2cBuffer[3]); } else { *p_int = (int)(i2cBuffer[3] << 24 | i2cBuffer[2] << 16 | i2cBuffer[1] << 8 | i2cBuffer[0]); } return true; } return false; } return false; } bool C24LCXX_I2C::Read(const short p_address, std::vector<unsigned char> & p_datas, const bool p_readLengthFirst, const int p_length2write) { // 1.Prepare buffer short address = p_address; int length = 0; if (p_readLengthFirst) { if (!Read(address, &length)) { // Read the length in big endian mode return false; } if (length == 0) { return true; } address += 4; // Skip the length value length -= 4; // length is the size of (string length + string) } else { if (p_length2write == -1) { length = p_datas.size(); } else { length = p_length2write; } } // 2. Memory address char i2cBuffer[2]; i2cBuffer[0] = (unsigned char)(address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)address & 0xff); // 3. Send I2C start + memory address if (_i2cInstance->write(_slaveAddress, i2cBuffer, 2, true) == 0) { // 4. read data + I2C stop unsigned char buffer[length]; int result = _i2cInstance->read(_slaveAddress, (char *)buffer, length); if (result == 0) { p_datas.assign(buffer, buffer + length); return (bool)(result == 0); } } return false; } bool C24LCXX_I2C::Read(const short p_address, std::string & p_string, const bool p_readLengthFirst, const int p_length2write) { /* std::vector<unsigned char> datas; if (Read(p_address, datas, p_readLengthFirst, p_length2write) == true) { p_string.assign((char *)datas.begin(), datas.size()); return true; } return false; */ // 1.Prepare buffer short address = p_address; int length = -1; if (p_readLengthFirst) { // The string was stored with its length if (!Read(address, &length)) { // Read the length as integer in big endian mode return false; } if (length == 0) { return true; } address += 4; // Skip the length value size length -= 4; // length is the size of (string length + string) } else { // The string length is provided by p_length2write parameter if (p_length2write == -1) { length = p_string.size(); } else { length = p_length2write; p_string.resize(p_length2write); } } // 2. Memory address char i2cBuffer[2]; i2cBuffer[0] = (unsigned char)(address >> 8); i2cBuffer[1] = (unsigned char)((unsigned char)address & 0xff); // 3. Send I2C start + memory address with repeat start if (_i2cInstance->write(_slaveAddress, i2cBuffer, 2, true) == 0) { // 4. Read data + I2C stop char buffer[length]; int result = _i2cInstance->read(_slaveAddress, (char *)buffer, length); if (result == 0) { p_string.assign(buffer, length); return true; } } return false; } #if defined(__DEBUG) void C24LCXX_I2C::DumpMemoryArea(const int p_address, const int p_count) { DEBUG_ENTER("C24LCXX_I2C::DumpMemoryArea: %d - %d", p_address, p_count) DEBUG("C24LCXX_I2C::DumpMemoryArea: Reading datas..."); std::vector<unsigned char> datas(p_count); if (!Read(p_address, datas, false)) { // Read bytes, including the lenght indication, buffer size is not set before the call std::cout << "C24LCXX_I2C::DumpMemoryArea: read failed\r" << std::endl; } else { std::cout << "C24LCXX_I2C::DumpMemoryArea: Read bytes:\r" << std::endl; HEXADUMP(&datas[0], p_count); std::cout << "\r" << std::endl; } } #endif // _DEBUG } // End of namespace _24LCXX_I2C