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eeprom_read_write.py
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#Script to write a 96 ascii character font bitmap to an I2C EEPROM chip
#Author - @matneee (Martin Allen) 29 Apr 2017, [email protected]
#EEPROM used was a Microchip 24LC128, although it should work with others in the same range
#May work with other I2C EEPROMS, but this is as yet untested
from microbit import *
#Data to be written to EEPROM - could be substituted for whatever suits your needs
font = bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x5f\x00\x00\x00\x07\x00\x07\x00\x14\x7f\x14\x7f\x14\x24\x2a\x7f\x2a\x12\x23\x13\x08\x64\x62\x36\x49\x55\x22\x50\x00\x05\x03\x00\x00\x00\x1c\x22\x41\x00\x00\x41\x22\x1c\x00\x14\x08\x3e\x08\x14\x08\x08\x3e\x08\x08\x00\x50\x30\x00\x00\x08\x08\x08\x08\x08\x00\x60\x60\x00\x00\x20\x10\x08\x04\x02\x3e\x51\x49\x45\x3e\x00\x42\x7f\x40\x00\x42\x61\x51\x49\x46\x21\x41\x45\x4b\x31\x18\x14\x12\x7f\x10\x27\x45\x45\x45\x39\x3c\x4a\x49\x49\x30\x01\x71\x09\x05\x03\x36\x49\x49\x49\x36\x06\x49\x49\x29\x1e\x00\x36\x36\x00\x00\x00\x56\x36\x00\x00\x08\x14\x22\x41\x00\x14\x14\x14\x14\x14\x00\x41\x22\x14\x08\x02\x01\x51\x09\x06\x32\x49\x79\x41\x3e\x7e\x11\x11\x11\x7e\x7f\x49\x49\x49\x36\x3e\x41\x41\x41\x22\x7f\x41\x41\x22\x1c\x7f\x49\x49\x49\x41\x7f\x09\x09\x09\x01\x3e\x41\x49\x49\x7a\x7f\x08\x08\x08\x7f\x00\x41\x7f\x41\x00\x20\x40\x41\x3f\x01\x7f\x08\x14\x22\x41\x7f\x40\x40\x40\x40\x7f\x02\x0c\x02\x7f\x7f\x04\x08\x10\x7f\x3e\x41\x41\x41\x3e\x7f\x09\x09\x09\x06\x3e\x41\x51\x21\x5e\x7f\x09\x19\x29\x46\x46\x49\x49\x49\x31\x01\x01\x7f\x01\x01\x3f\x40\x40\x40\x3f\x1f\x20\x40\x20\x1f\x3f\x40\x38\x40\x3f\x63\x14\x08\x14\x63\x07\x08\x70\x08\x07\x61\x51\x49\x45\x43\x00\x7f\x41\x41\x00\x02\x04\x08\x10\x20\x00\x41\x41\x7f\x00\x04\x02\x01\x02\x04\x40\x40\x40\x40\x40\x00\x01\x02\x04\x00\x20\x54\x54\x54\x78\x7f\x48\x44\x44\x38\x38\x44\x44\x44\x20\x38\x44\x44\x48\x7f\x38\x54\x54\x54\x18\x08\x7e\x09\x01\x02\x0c\x52\x52\x52\x3e\x7f\x08\x04\x04\x78\x00\x44\x7d\x40\x00\x20\x40\x44\x3d\x00\x7f\x10\x28\x44\x00\x00\x41\x7f\x40\x00\x7c\x04\x18\x04\x78\x7c\x08\x04\x04\x78\x38\x44\x44\x44\x38\x7c\x14\x14\x14\x08\x08\x14\x14\x18\x7c\x7c\x08\x04\x04\x08\x48\x54\x54\x54\x20\x04\x3f\x44\x40\x20\x3c\x40\x40\x20\x7c\x1c\x20\x40\x20\x1c\x3c\x40\x30\x40\x3c\x44\x28\x10\x28\x44\x0c\x50\x50\x50\x3c\x44\x64\x54\x4c\x44\x00\x08\x36\x41\x00\x00\x00\x7f\x00\x00\x00\x41\x36\x08\x00\x10\x08\x08\x10\x08\x00\x00\x00\x00\x00')
#Write to EEPROM
#First 2 bytes represent (data [0] and [1]) represent the memory address
#Third byte (data[2]) is the value to be written to that address
def weep(eepAdr, value):
data = bytearray(3)
data[0]=eepAdr >> 8 #msb
data[1]=eepAdr & 0xFF #lsb
data[2]=value
i2c.write(0x50, data, repeat = False)
sleep(20)
return("OK")
#Read from EEPROM
#Writes the 2 byte memory address to tell the EEPROM where to fetch data from, then reads values from that memory address
#num represents how many sequential bytes to read (default is 1)
def reep(eepAdr, num = 1):
data = bytearray(2)
data[0]=eepAdr >> 8
data[1]=eepAdr & 0xFF
i2c.write(0x50, data)
value = (i2c.read(0x50, num, repeat=False))
return value[:]
adr = 0
for val in font:
weep (adr, val)
adr +=1