Dear Timur Tabi,
In message 4C57336E.7050704@freescale.com you wrote:
Wolfgang Denk wrote:
Why is this i2c_read() needed or actually useful? Should the error return code from the i2c_write() above not be sufficient indication that the writing failed? If that was the case, then some other parts of the code need fixing.
That's just the way the EEPROM chip works. When it's set into write-protect mode, it cheerfully accepts all of the I2C write commands, and acknowledges them appropriately, but it doesn't actually store the data into the EEPROM. The read-back is the only way I've found to verify that the write has actually occurred.
Is it correct to assume the the WP signal is connected to some GPIO pin which can be set / unset in software?
Best regards,
Wolfgang Denk