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:
- 4:650f3259bd4f
- Parent:
- 3:5df584fbabfe
- Child:
- 5:2f61885d8bc3
--- a/24LCxx_I2C.h Mon Sep 25 18:59:44 2017 +0000 +++ b/24LCxx_I2C.h Wed Apr 25 09:37:34 2018 -0500 @@ -19,36 +19,10 @@ #if !defined(__24LCXX_I2C_H__) #define __24LCXX_I2C_H__ -#include <string> -#include <vector> #include "mbed.h" -//#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 I2CModuleRefCounter; - + class C24LCXX_I2C { /** 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; @@ -66,254 +40,17 @@ 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 unsigned int p_frequency = 400000); - - /** Destructor - */ + C24LCXX_I2C(const PinName p_sda, const PinName p_scl, const unsigned char p_address, const unsigned int p_frequency = 400000); 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 - * - * @param p_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. Default 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, const unsigned char 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_length2read 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_length2read = -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