I2C EEPROM Reading And Writing

We highly encourage everyone to use our new Python package which is packed with features. This library is still supported, but is not recommended for new design.

The example below demonstrates how to read from and write to an I2C EEPROM. This particular demo uses the SparkX Qwiic 512Kbit EEPROM from Sparkfun.

from binhoHostAdapter import binhoHostAdapter

from time import sleep

class Sparkfun_QwiicEEPROM:

    def __init__(self, addr, pageWriteMs):
        self.eeprom_address = addr;
        self.eeprom_pageWriteTime_ms = pageWriteMs

    def begin(self, adapter):
        self.hostAdapter = adapter

    def writePage(self, memAddress, pageData):
        memAddressHigh = (memAddress >> 8)
        memAddressLow = memAddress & 0xFF

        fullAddress = [memAddressHigh, memAddressLow]

        ## load the address into the buffer
        self.hostAdapter.writeToBuffer(0, 0, fullAddress)

        ## load the data into the buffer
        self.hostAdapter.writeToBuffer(0, 2, pageData)

        ## I2C Start Transmission
        self.hostAdapter.startI2C(0, self.eeprom_address)

        ## I2C Write Buffer
        self.hostAdapter.writeFromBufferI2C(0, 34)

        ## I2C End Transmission
        self.hostAdapter.endI2C(0)

        ## Clear the Buffer
        self.hostAdapter.clearBuffer(0)

    def readPage(self, memAddress):
        memAddressHigh = (memAddress >> 8)
        memAddressLow = memAddress & 0xFF

        ## Clear the Buffer
        self.hostAdapter.clearBuffer(0)

        ## I2C Start Transmission
        print(self.hostAdapter.startI2C(0, self.eeprom_address))

        print(self.hostAdapter.writeByteI2C(0, memAddressHigh))
        print(self.hostAdapter.writeByteI2C(0, memAddressLow))

        ## I2C End Transmission
        print(self.hostAdapter.endI2C(0))

        ## Request the data
        self.hostAdapter.readToBufferI2C(0, self.eeprom_address, 32)

        print(self.hostAdapter.readBuffer(0, 32))

    def pageWriteDelay(self):
        return self.eeprom_pageWriteTime_ms / 1000.0

# Change this to match your COMPort
COMPORT = "COM27"

print("EEPROM Example using Binho Host Adapter")
print("v1.0 -- Jonathan Georgino <[email protected]>")
print()

# create the binhoHostAdapter object
binho = binhoHostAdapter.binhoHostAdapter(COMPORT)
eeprom = Sparkfun_QwiicEEPROM(0xA0, 1)

print("Connecting to host adapter...")
print(binho.getDeviceID())
print()

print("Configuring I2C settings...")
binho.setOperationMode(0, "I2C")
binho.setPullUpStateI2C(0, "EN")
binho.setClockI2C(0, 400000)
print("Ready!")
print()


eeprom.begin(binho)

currentMemoryAddress = 0x0000

print("Starting to write to the EEPROM ...")

for i in range(4):

    print("Writing Page #" + str(i))

    pageData = [0xAA+i, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0]
    pageData += [0xAB+i, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1]

    print("PageData=")
    print(pageData)

    eeprom.writePage(currentMemoryAddress, pageData)

    currentMemoryAddress += 32

    sleep(eeprom.pageWriteDelay())

    print()
    print()

currentMemoryAddress = 0

print("Starting to read to the EEPROM ...")

for i in range(4):

    print("Reading Page #" + str(i))

    eeprom.readPage(currentMemoryAddress)

    currentMemoryAddress += 32

    print()
    print()

binho.close()