[code]from microbit import *

FRAM_ID = 0x9f
FRAM_WREN = 0x06
FRAM_WRITE = 0x02
FRAM_READ = 0x03

class FRAM:
    def __init__(self, spi, pin):
        self.spi = spi
        self.pin = pin

    def fram_id(self):
        self.pin.write_digital(0)  # CS fram
        self.spi.write(bytearray([FRAM_ID]))
        chip_id = self.spi.read(4)
        self.pin.write_digital(1)  # remove fram CS
        return chip_id

    def fram_wren(self):
        self.pin.write_digital(0)  # CS fram
        self.spi.write(bytearray([FRAM_WREN]))
        self.pin.write_digital(1)  # remove fram CS

    def fram_read(self, address, byte_count=1):
        addr = bytearray(3)
        addr = address.to_bytes(3, "big")
        self.pin.write_digital(0)  # CS fram
        self.spi.write(bytearray([FRAM_READ]))
        self.spi.write(bytearray([addr[0]]))
        self.spi.write(bytearray([addr[1]]))
        self.spi.write(bytearray([addr[2]]))
        read_list = self.spi.read(byte_count)
        self.pin.write_digital(1)  # remove fram CS
        return read_list

    def fram_write(self, address, value):
        addr = bytearray(3)
        addr = address.to_bytes(3, "big")
        self.pin.write_digital(0)  # CS fram
        self.spi.write(bytearray([FRAM_WRITE]))
        self.spi.write(bytearray([addr[0]]))
        self.spi.write(bytearray([addr[1]]))
        self.spi.write(bytearray([addr[2]]))
        self.spi.write(bytearray([value]))
        self.pin.write_digital(1)  # remove fram CS[/code]