I2C_TransferHandling() for 24c04 A8 set in select devices

passafabio2 · ‎2017-10-14

Posted on October 14, 2017 at 22:18

How to manage: I2C_TransferHandling() for accessing high sector (>255 bit) of a 24c04 eeprom?

In a selecting device I'm not capable to modify 0xA0 to 0xA1 for settings A8=1 and access to 256..512 bytes of eeprom.

I'm using stm32f051 and fwlib 1.0.0.

I know is an old firmware library but I need to manage an old board with added a eeprom memory.

Thanks

Fabio

passafabio2 · ‎2017-10-17

Posted on October 17, 2017 at 08:15

Thanks KiC.

Fixed writing 0xA2(+1 for reading) instead of 0xA1.

Bye

View solution in original post

S.Ma · ‎2017-10-15

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);

}

passafabio2 · ‎2017-10-15

Posted on October 16, 2017 at 08:49

void I2C_TransferHandling(I2C_TypeDef* I2Cx, uint16_t Address, uint8_t Number_Bytes, uint32_t ReloadEndMode, uint32_t StartStopMode)

Is a ruotines inside STM32F0xx_1_2c.c file, in STM32F0xx_StdPeriph_Lib_V1.X.X file, downloaded from st web site.

I try to force uint16_t Address in I2C_TransferHandling() with 0xA1 instead of 0xA0 declared in Init structure but the oscilloscope show me always 0xA0...

Any example/info to manage this ?

Thanks Fabio

S.Ma · ‎2017-10-16

Posted on October 16, 2017 at 09:58

If it is A0 for write, it's A1 for read. The extra address bit in this case it A0/A2 for write, A1/A3 for read.

Some write the slave address in 7 bit, some do in 8 bit hence the confusion.

Same issue for UART RX/TX, people screw up because it's not clear if we are talking host or device... and then both wires needs to be crossed to work things out...

passafabio2 · ‎2017-10-17

Posted on October 17, 2017 at 08:15

Thanks KiC.

Fixed writing 0xA2(+1 for reading) instead of 0xA1.

Bye