I2C_TransferHandling() for 24c04 A8 set in select devices

Posted on October 15, 2017 at 11:30

The slave address should not be a constant, it should be defined as global variable, predefined with 0xA0, when passing the eeprom 9 bit address, crop the most significant bit and adjust the slave address bit before calling the function. 2404=4 kbit = 512 bytes = 9 bit address, 1 msb put within the slave address.

//#define EEP_24C256 //#define EEP_24C08

#define EEP_24512

#ifdef EEP_24512

#define EEPSIZE 480 // last 1024 bytes will be in fact the MCU internal 1 kb EEPROM. 61440 bytes external (60kb)

#define EEPPAGESIZE 32 // up to 128 is possible

//#define EEP_SLAVEADR 0xAE

//#define EEP_SLAVEADR 0xAC // hybrid FROG on board EEPROM

#define EEP_SLAVEADR 0xA2 // Draco STM8L on board EEPROM

#endif

#ifdef EEP_24C256

#define EEPSIZE 256

#define EEPPAGESIZE 32

#define EEP_SLAVEADR 0xA0

#endif

#ifdef EEP_24C08

#define EEPSIZE 8

#define EEPPAGESIZE 16

#define EEP_SLAVEADR 0xA0

#endif

#ifdef EEP_24C16

#define EEPSIZE 16

#define EEPPAGESIZE 16

#define EEP_SLAVEADR 0xA0

#endif

#define I2C_Start I2CIO_Start

#define I2C_Stop I2CIO_Stop

#define I2C_ReadByte I2CIO_Receive

#define I2C_SendByte I2CIO_Transmit

#define I2C_SlaveDetected I2CIO_SlaveDetected

u8 I2C_Errors;

// Eeprom size in kilobit (64kBit = 24C64 = 4kbyte), its physical page write size, and its sub address

// These define the used EEPROM (SubAdr may be used for 24C16 encoding sub adress MSBs in Slave Address LSBs

#ifdef EEP_24512

#define EEP_WRITE(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR);I2C_SendByte(SubAdr>>8);I2C_SendByte(SubAdr);

#define EEP_READ(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR | 0x01 )

#endif

#ifdef EEP_24C256

#define EEP_WRITE(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR & 0xFE);I2C_SendByte(SubAdr>>8);I2C_SendByte(SubAdr);

#define EEP_READ(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR | 0x01)

#endif

#ifdef EEP_24C08

#define EEP_WRITE(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR & 0xFE);I2C_SendByte(SubAdr&0x00FF);

//#define EEP_WRITE(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR & 0xFE /*| ((SubAdr>>7)&0x06))*/;I2C_SendByte(SubAdr&0x00FF);

#define EEP_READ(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR | 0x01)

//#define EEP_READ(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR /*| ((SubAdr>>7)&0x06)*/ | 0x01)

#endif

#ifdef EEP_24C16

#define EEP_WRITE(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR | ((SubAdr>>7)&0x0E));I2C_SendByte(SubAdr);

#define EEP_READ(SubAdr) I2C_Errors = I2C_Start(EEP_SLAVEADR | ((SubAdr>>7)&0x0E) | 0x01)

#endif

#define BLANKBYTE 0xFF

#define EEP_MAXWRITETIME_MS 16

// This define any mcu IO controlling WE signal for better protection

#define WE_ENABLE //PADDR.BIT.6 = 1;PADR.BIT.6 = 1;Delay_ms(1)

#define WE_DISABLE //PADDR.BIT.6 = 1;PADR.BIT.6 = 0

// This define the number of retrials in case of communication errors

#define NB_OF_RETRIALS 0

// The EEPROM memory check results

#define EEP_OK 0

#define EEP_NOACK 0x01

#define EEP_BLANK 0x02

// adapted for this project

//#define Delay_ms(x) Wait_us( (x)*1000L )

#define BOOL u8

u8 Is_EEP_Detected(void)

{

return I2CIO_IsSlaveDetected(EEP_SLAVEADR);

}