Raspberry Pi - AT45DB081D SPI Flash

at45db081d_spi.py

import spidev

def ready():
        command = [0xD7, 0xFF]
        recv = spi.xfer(command)
        return (recv[1] & 0x80) > 0


def read_mem(page, offset=0, num=256):
        if page < 2**12 and offset < 2**8:
                addrByte1 = (page & 0xF00) >> 8
                addrByte2 = (page & 0x0FF)
                addrByte3 = offset
                opcode = [0x0B]
                address = [addrByte1, addrByte2, addrByte3]
                dontcare = [0xFF]
                command = opcode + address + dontcare
                recv = spi.xfer(command + [0xFF] * num)
                return recv[len(command):]


def read_buffer(num, offset=0, buffer=0):
        opcode = 0
        if opcode == 0:
                opcode = 0xD4
        else:
                opcode = 0xD6
        command = [opcode, 0xFF, 0xFF, offset, 0xFF]
        recv = spi.xfer(command + [0xFF]*num)
        return recv[len(command):]


def write_buffer(data, offset=0, buffer=0):
        opcode = 0
        if opcode == 0:
                opcode = 0x84
        else:
                opcode = 0x87
        command = [opcode, 0xFF, 0xFF, offset]
        spi.xfer(command + data)


def buffer_to_mem(page, buffer=0):
        opcode = 0
        if opcode == 0:
                opcode = 0x83
        else:
                opcode = 0x86
        addrByte1 = (page & 0xF00) >> 8
        addrByte2 = (page & 0x0FF)
        command = [opcode, addrByte1, addrByte2, 0xFF]
        spi.xfer(command)
        while not ready():
                pass
        print "Ready: %s" % (ready())


spi = spidev.SpiDev()
spi.open(0,0)
spi.max_speed_hz = 10000000