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
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Diff: 24LCxx_I2C.h
- Revision:
- 0:21c698aa86f6
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/24LCxx_I2C.h Wed Oct 17 07:15:33 2012 +0000 @@ -0,0 +1,322 @@ +/* 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. + */ +#if !defined(__24LCXX_I2C_H__) +#define __24LCXX_I2C_H__ + +#include <string> +#include <vector> + +#include "Debug.h" // Include mbed header + debug primitives. See DebugLibrary + +namespace _24LCXX_I2C { + /** This class provides simplified I2C access to a Microchip 24LCxx Serial EEPROM device. V0.0.0.3 + * + * Note that if the LPC1768 is powered in 3.3V and Microchip 24LCxx Serial EEPROM device could be powered at 3.3V or 5V. + * In this case, you shall use a bi-directional level shifter for I2C-bus. Please refer to AN97055 (http://ics.nxp.com/support/documents/interface/pdf/an97055.pdf) + * Microchip 24LCxx Serial EEPROM device reference: + * - 24LC256: DS21203K + * - 24LC64 : DS21189D + * + * Note that for I2C details, please visit http://www.datelec.fr/fiches/I2C.htm + * + * Note that this header file include following headers: + * - <string> + * - <vector> + * - <mbed.h> + * + * @remark This class was validated with Tektronix TDS2014 oscilloscope in 3.3V and in mixte power mode 3.3V for mbed and 5V for the Microchip 24LCxx Serial EEPROM device + * @author Yann Garcia (Don't hesitate to contact me: garcia.yann@gmail.com) + */ + class C24LCXX_I2C { // TODO: Add EE Polling for write methods + /** Reference counter used to guarentee unicity of the instance of I2C class + */ + static unsigned char I2CMouduleRefCounter; + + /** Device address input: A0, A1, A2 (Pins <1,3>). See DS21203K/DS21189D - Figure 5-1: Control Byte Format for address format details + */ + unsigned char _slaveAddress; + /** WP state indicator (pin 7); true is write protected, false otherwise + */ + DigitalOut *_wp; + /** An unique instance of I2C class + */ + I2C *_i2cInstance; + public: + /** Memory storage mode + */ + enum Mode { + LittleEndian, //<! Little Endian mode: 0xA0B70708 is stored as 08: MSB and A0 LSB + BigEndian //<! Little Endian mode: 0xA0B70708 is stored as AO: MSB and 08 LSB + }; + public: + /** Constructor with Write Protect command pin wired. Use it to manage the first I2C module on 3.3V or 5V network + * + * @param p_sda: MBed pin for SDA + * @param p_scl: MBed pin for SCL + * @param p_address: Device address input: A0, A1, A2 (Pins <1,3>) + * @param p_wp: MBed pin to manage Write Protect input. If NC, WP is not managed, default value is NC, not connected + * @param p_frequency: Frequency of the I2C interface (SCL), default value is 400KHz + * Example: + * - If A1 and A2 pins are tired to Vdd and A0 is tired to Vss, address shall '00000110'B + * - If A0 and A1 pins are tired to Vss and A2 is tired to Vdd, address shall '00000100'B + */ + C24LCXX_I2C(const PinName p_sda, const PinName p_scl, const unsigned char p_address, const PinName p_wp = NC, const int p_frequency = 400000); + + /** Destructor + */ + virtual ~C24LCXX_I2C(); + + /** Used to return the unique instance of I2C instance + */ + inline const I2C * operator * () { return (const I2C *)_i2cInstance; }; + + /** Erase of memory area starting at the specified address, using the specified pattern to fill the memory area + * + * @paramp_startAddress The address of the memory area (from 0 to N - 1, N is the number of cells of the memory) + * @param p_count The size of the memory area to erase + * @param p_pattern The pattern value to use to fill the memory area. Defqult vqlue: 0x00 + * @return true on success, false otherwise + * Exemple: + * @code + * ... + * myEEPROM.EraseMemoryArea(0, 1024); // Set to 0x00 the first 1Kb memory + * ... + * @endcode + */ + bool EraseMemoryArea(const short p_startAddress, const int p_count, unsigned char const p_pattern = 0x00); + + /** Write a byte at the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_byte The byte value to save + * @return true on success, false otherwise + * Exemple: + * @code + * unsigned char value = 0xaa; + * ... + * myEEPROM.Write(memoryAddress, value); + * ... + * @endcode + */ + bool Write(const short p_address, const unsigned char p_byte); + + /** Write a short at the specified memory address according to the specified mode + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_short The short value to save + * @param p_mode The storage mode. Default value: BigEndian + * @return true on success, false otherwise + * Exemple: + * @code + * short value = 0xcafe; + * ... + * myEEPROM.Write(memoryAddress, value, LittleEndian); + * ... + * @endcode + */ + bool Write(const short p_address, const short p_short, const C24LCXX_I2C::Mode p_mode = BigEndian); + + /** Write an integer at the specified memory address according to the specified mode + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_int The integer value to save + * @param p_mode The storage mode. Default value: BigEndian + * @return true on success, false otherwise + * Exemple: + * @code + * int value = 0xcafedeca; + * ... + * myEEPROM.Write(memoryAddress, value, LittleEndian); + * ... + * @endcode + */ + bool Write(const short p_address, const int p_int, const C24LCXX_I2C::Mode p_mode = BigEndian); + + /** Write a buffer of bytes at the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_datas The string to save + * @param p_storeLength If true, store also the length of the buffer in Big Endian mode, otherwise the length will be provided by p_length2write parameter. Default value: true. + * @param p_length2write The number of bytes to write, -1 for all characters. Default value: -1 + * @return true on success, false otherwise + */ + bool Write(const short p_address, const std::vector<unsigned char> & p_datas, bool p_storeLength = true, const int p_length2write = -1); + + /** Write a buffer of bytes at the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_datas The buffer of bytes to save + * @param p_storeLength If true, store also the length of the buffer in Big Endian mode, otherwise the length will be provided by p_length2write parameter. Default value: true. + * @param p_length2write The number of bytes to write, -1 for all bytes. Default value: -1 + * @return true on success, false otherwise + */ + bool Write(const short p_address, const unsigned char *p_datas, bool p_storeLength = true, const int p_length2write = -1); + + /** Write a string at the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_string The string to save + * @param p_storeLength If true, store also the length of the string in Big Endian mode, otherwise the length will be provided by p_length2write parameter. Default value: true. + * @param p_length2write The number of character to write, -1 for all characters + * @return true on success, false otherwise + * Exemple: + * @code + * std::string text2save("CafeDeca"); + * ... + * myEEPROM.Write(memoryAddress, text2save); + * ... + * @endcode + */ + bool Write(const short p_address, const std::string & p_string, const bool p_storeLength = true, const int p_length2write = -1); + + /** Write a buffer of characters at the specified memory address (from 0 to N - 1, N is the number of cells of the memory) + * + * Note that the length of the buffer is not saved and the string is saved in Big Endian mode + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_datas The string to save + * @param p_storeLength If true, store also the length of the string in Big Endian mode, otherwise the length will be provided by p_length2write parameter. Default value: true. + * @param length2write The number of character to write, -1 for all characters + * @return true on success, false otherwise + */ + bool Write(const short p_address, const char *p_datas, const bool p_storeLength = true, const int p_length2write = -1); + + /** Read a byte from the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_byte The byte value to read + * @return true on success, false otherwise + * Exemple: + * @code + * unsigned char value; + * ... + * myEEPROM.Read(memoryAddress, (unsigned char *)&value); + * ... + * @endcode + */ + bool Read(const short p_address, unsigned char *p_value); + + /** Read a short from the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_short The short value to read + * @return true on success, false otherwise + * Exemple: + * @code + * short value; + * ... + * myEEPROM.Read(memoryAddress, (short *)&value); + * ... + * @endcode + */ + bool Read(const short p_address, short *p_short, C24LCXX_I2C::Mode p_mode = BigEndian); + + /** Read an integer from the specified memory address + * + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_int The integer value to read + * @return true on success, false otherwise + * Exemple: + * @code + * int value; + * ... + * myEEPROM.Read(memoryAddress, (int *)&value); + * ... + * @endcode + */ + bool Read(const short p_address, int *p_int, C24LCXX_I2C::Mode p_mode = BigEndian); + + /** Read a buffer of bytes from the specified memory address and store it into a std::vector<unsigned char> object + * + * Note that the size of the buffer object is used for the number of bytes to read + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_datas The buffer to fill + * @param p_readLengthFirst If true, read the length first and p_length2write parameter is ignored, otherwise the length is provided by p_length2write parameter. Default value: true + * @param p_length2write The number of character to write, -1 to use the size of the string buffer + * @return true on success, false otherwise + * Exemple: + * @code + * std::vector<unsigned char> datas(bufferLength); + * ... + * myEEPROM.Read(memoryAddress, datas); + * ... + * @endcode + */ + bool Read(const short p_address, std::vector<unsigned char> & p_datas, bool p_readLengthFirst = true, int p_length2write = -1); + + /** Read a buffer of characters from the specified memory address and store it into a string object + * + * Note that the size of the string object is used for the number of characters to read + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_string The string buffer to fill + * @param p_readLengthFirst If true, read the length first and p_length2write parameter is ignored, otherwise the length is provided by p_length2write parameter. Default value: true + * @param p_length2write The number of character to write, -1 to use the size of the string buffer + * @return true on success, false otherwise + * Exemple: + * @code + * std::string readtext; + * ... + * myEEPROM.Read(memoryAddress, readtext); + * ... + * @endcode + */ + bool Read(const short p_address, std::string & p_string, bool p_readLengthFirst = true, int p_length2write = -1); + + /** Activate or deactivate write protect (pin 7) + * + * Note that a voltage of 3.3V apply to WP input of 24LCxx device is enough to enable write protect + * @param p_writeProtect: Set to true to activate write protection, false otherwise + * @return true on success, false otherwise + */ + bool WriteProtect(const bool p_writeProtect); + + /** Indicate the current WP state indicator (pin 7) + * @return true is write protected, false otherwise + */ + inline bool IsWriteProtected() { + return (_wp != NULL) ? (bool)(_wp->read() == 1) : false; + } + +#if defined(__DEBUG) + /** Dump a memory area + * + * Note that this method is available only on debug mode + * @param p_address The memory address (from 0 to N - 1, N is the number of cells of the memory) + * @param p_count The number of bytes toi dump + * @return true on success, false otherwise + */ + void DumpMemoryArea(const int p_address, const int p_count); + /** For debug purpose only + */ + inline std::string & ToString() { return _internalId; }; +#else // __DEBUG + inline void DumpMemoryArea(const int p_address, const int p_count) {}; +#endif // _DEBUG + + private: + /** Internal reference identifier + */ + std::string _internalId; + + }; // End of class C24LCXX_I2C + +} // End of namespace _24LCXX_I2C + +using namespace _24LCXX_I2C; + +#endif // __24LCXX_I2C_H__