from machine import I2C, Pin
import time

####################################################################
#This is a class called CAT24C02, which is a library for
#interacting with a CAT24C02 EEPROM chip using the I2C protocol.
####################################################################
class CAT24C02(object):
     def __init__(self, i2c, i2c_addr, pages=2, bpp=16):
             self.i2c = i2c
             self.i2c_addr = i2c_addr
             self.pages = pages
             self.bpp = bpp # bytes per page

     def capacity(self):
         """Storage capacity in bytes"""
         return self.pages * self.bpp

     def read(self, addr, nbytes):
         """Read one or more bytes from the EEPROM starting from a specific address"""
         return self.i2c.readfrom_mem(self.i2c_addr, addr, nbytes, addrsize=8)

     def write(self, addr, buf):
         """Write one or more bytes to the EEPROM starting from a specific address"""
         offset = addr % self.bpp
         partial = 0
         # partial page write
         if offset > 0:
             partial = self.bpp - offset
             self.i2c.writeto_mem(self.i2c_addr, addr, buf[0:partial], addrsize=8)
             time.sleep_ms(5)
             addr += partial
         # full page write
         for i in range(partial, len(buf), self.bpp):
             self.i2c.writeto_mem(self.i2c_addr, addr+i-partial, buf[i:i+self.bpp], addrsize=8)
             time.sleep_ms(5)

     def wipe(self):
         buf = b'\xff' * 32
         for i in range(1):
             self.write(i*32, buf)

##################################################
#this is the main program following the class
##################################################
sda=machine.Pin(16)
scl=machine.Pin(17)
i2c=machine.I2C(0,sda=sda, scl=scl, freq=400000)
i2caddr=80 #Set the I2C address of your EEPROM.

#print("I2C Devices :")
#print(i2c.scan())

eeprom = CAT24C02(i2c,i2caddr) #create an instance of the class

#######################################
#Read and Write routines for the 24c02
#######################################
#eeprom.write(0, b'0123456789BCDEF0123456789abcdef') # Write String to memory address 0
eeprom.write(0, 'Th') # Write String to memory address 0
#eeprom.write(0, b'00000000000000001111111111111111') # Mutliple page writes (fill pages 0 and 1 with test data)
#eeprom.write(13, b'abcdef') # Write is performed in two steps, "abc" in the first page then "def" in the next page
#eeprom.wipe() # Wipe the EEPROM

#print(eeprom.read(0,32))  #read the entire memory space (256 bits, 32 bytes)
print(eeprom.read(0,2))  #Read one byte
#print((eeprom.read(0, 32)).decode('utf-8')) #Read and print 32Bytes as a string starting from memory address 0
#print((eeprom.read(0, 10)).decode('ascii'))