How to read and write values to EEPROM IC (24C16 IC)

[Lchal.1]

HI, i want to read and write values to EEPROM 24C16 IC using stm32f103 . I am able to write the value but i am not able to read the values . And how can i check whether i have written value to my eeprom ic and how to read value. can anyone help me with it please.

Thank you

[Vangelis Fortounas]

Hello

uint8_t buf[16];

HAL_I2C_Mem_Read(&hi2c1, 0xA0, 0x00, 1, buf, 16, 100);// 24c16 read the first 16 bytes from page 0

[Lchal.1]

void write_eeprom_reg(uint16_t reg_addr, uint8_t value)

{

//uint8_t d[3];

d[0]=(reg_addr>>8) & 0xFF;

d[1]=(reg_addr) & 0xFF;

d[2]=value;

while(HAL_I2C_IsDeviceReady(&hi2c1,(uint16_t)(0x50<<1),3,100)!=HAL_OK)

{

}

if(HAL_I2C_Master_Transmit(&hi2c1,(uint16_t)(0x50<<1),(uint8_t*)d,sizeof(d),1000)!=HAL_OK)

{

Error_Handler();

}

else

{

printf("Master transmitt Successfull\r\n");

}

}

uint8_t read_eeprom_reg(uint16_t addr)

{

uint8_t buffer[]={0x05};

//uint8_t buffer=addr;

uint8_t value;

while(HAL_I2C_IsDeviceReady(&hi2c1,(uint16_t)(0x50<<1),3,100)!=HAL_OK)

{

}

while(HAL_I2C_Master_Transmit(&hi2c1, (uint16_t)(0x50<<1), (uint8_t*)&buffer, 2, 100)!=HAL_OK)

{

if(HAL_I2C_GetError(&hi2c1)!=HAL_I2C_ERROR_AF)

{

Error_Handler();

}

}

while(HAL_I2C_IsDeviceReady(&hi2c1,(uint16_t)(0x50<<1),3,100)!=HAL_OK)

{

}

while(HAL_I2C_Master_Receive(&hi2c1, (uint16_t)(0x50<<1),(uint8_t*)&value,1,100)!=HAL_OK)

{

if(HAL_I2C_GetError(&hi2c1)!=HAL_I2C_ERROR_AF)

{

Error_Handler();

}

return value;

}

}

This is the code i have done can tou say me the error what i have done and what i need to add to it.

Thank you

[Vangelis Fortounas]

Hello

You can't just transmit 3 bytes to write a memmory like 2416

2416 requires (for random write ) between d[1] and d[2] , master to transmit a stop condition.

HAL_I2C_Master_Transmit does not transmit STOPs between bytes but only at the end.

Use HAL_I2C_Mem_Write instead of HAL_I2C_Master_Transmit function

[Pavel A.]

Note that 24C16 has several consecutive addresses on I2C bus (each address selects one 256 byte block).

Also the starting address within a block and size for writing has limitations, see the datasheet.

[Lchal.1]

void write_eeprom_reg(uint16_t reg_addr, uint8_t value)

{

//uint8_t d[3];

d[0]=(reg_addr>>8) & 0xFF;

d[1]=(reg_addr) & 0xFF;

d[2]=value;

while(HAL_I2C_IsDeviceReady(&hi2c1,(uint16_t)(0x50<<1),3,100)!=HAL_OK)

{

}

if(HAL_I2C_Master_Transmit(&hi2c1,(uint16_t)(0x50<<1),(uint8_t*)d,sizeof(d),1000)!=HAL_OK)

{

Error_Handler();

}

else

{

printf("Master transmitt Successfull\r\n");

}

}

uint8_t read_eeprom_reg(uint16_t addr)

{

uint8_t buffer[]={0x05};

//uint8_t buffer=addr;

uint8_t value;

while(HAL_I2C_IsDeviceReady(&hi2c1,(uint16_t)(0x50<<1),3,100)!=HAL_OK)

{

}

while(HAL_I2C_Master_Transmit(&hi2c1, (uint16_t)(0x50<<1), (uint8_t*)&buffer, 2, 100)!=HAL_OK)

{

if(HAL_I2C_GetError(&hi2c1)!=HAL_I2C_ERROR_AF)

{

Error_Handler();

}

}

while(HAL_I2C_IsDeviceReady(&hi2c1,(uint16_t)(0x50<<1),3,100)!=HAL_OK)

{

}

while(HAL_I2C_Master_Receive(&hi2c1, (uint16_t)(0x50<<1),(uint8_t*)&value,1,100)!=HAL_OK)

{

if(HAL_I2C_GetError(&hi2c1)!=HAL_I2C_ERROR_AF)

{

Error_Handler();

}

return value;

}

}

This is the code i have done can tou say me the error what i have done and what i need to add to it.

Thank you

[Pavel A.]

Too many errors, this code is hopeless.. Please do what Vangelis Fortounas advices.

-- pa