Frage zur Adressierung EEPROM FM24CL16B

uint32_t FRAM_write(uint8_t page, void* data, uint32_t length)

{

  uint32_t ret_val = 0;

  uint32_t i;

  if (length == 0) return 0;

  ret_val += I2C_start(I2C);

  ret_val += I2C_send_address(I2C, (FM24CL16B_SLAVE_ID << 4) | (page << 1), I2C_Direction_Transmitter); // prepare a write operation

  ret_val += I2C_write(I2C, 0);    // set lower 8 bit of the word address to 0

  while (length) {          // write all bytes

    ret_val += I2C_write(I2C, *(uint8_t*)data);

    (uint8_t*)data++;        // proceed to next data byte

    length--;

  }

  I2C_GenerateSTOP(I2C, ENABLE);

  return ret_val;

}

uint32_t FRAM_read(uint8_t page, void* data, uint32_t length)

{

  uint32_t ret_val = 0;

  uint32_t i;

  if (length == 0) return 0;

  ret_val += I2C_start(I2C);

  ret_val += I2C_send_address(I2C, (FM24CL16B_SLAVE_ID << 4) | (page << 1), I2C_Direction_Transmitter); // prepare a write operation

  ret_val += I2C_write(I2C, 0);      // set word address (lower 8 bits)

  ret_val += I2C_restart(I2C);      // do not perform the write operation, instead generate a start condition

  ret_val += I2C_send_address(I2C, (FM24CL16B_SLAVE_ID << 4) | (page << 1), I2C_Direction_Receiver); // prepare a read operation

  while (length >= 2) {          // read all bytes until second to the last has been read

    ret_val += I2C_read(I2C, (uint8_t*)data);

    (uint8_t*)data++;          // proceed to next data byte

    length--;

  }

  I2C_AcknowledgeConfig(I2C, DISABLE);    // disable acknowledge of the received data so that no further bytes after the next read byte are requested

  ret_val += I2C_read(I2C, (uint8_t*)data);  // read last byte

  I2C_AcknowledgeConfig(I2C, ENABLE);      // enable acknowledge again

  I2C_GenerateSTOP(I2C, ENABLE);

  return ret_val;

}