readReg() function showing unknown error. Here i am using AT24C256 EEPROM with I2C_1 code: import mraa as m import time x = m.I2c(1) while(1): x.address(0xA0) x.writeReg(0x0000,0x55) # also tried x.writeReg(0x00,0x55) time.sleep(5) x.address(0xA0) if x.readReg(0x0000)== 0x55: # x.readReg(0x00) print("EEPROM OK") else: print("EEPROM NOT OK") Error: root@rb-imx6ul:~/programs# vi EEPROM.py root@rb-imx6ul:~/programs# python3 EEPROM.py Traceback (most recent call last): File "EEPROM.py", line 14, in <module> if x.readReg(0x0000)== 0x55: File "/usr/lib/python3.5/site-packages/mraa.py", line 549, in readReg return _mraa.I2c_readReg(self, reg) ValueError: Unknown error in I2c::readReg()