61 lines
2 KiB
Python
61 lines
2 KiB
Python
"""
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UNO Optiboot programming example, be sure you have the UNO wired up so:
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UNO Ground to CircuitPython GND
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UNO 5V to CircuitPython USB or make sure the UNO is powered by USB
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UNO Pin 13 -> CircuitPython SCK
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UNO Pin 12 -> CircuitPython MISO
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UNO Pin 11 -> CircuitPython MOSI
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UNO RESET -> CircuitPython D5 (or change the init() below to change it!)
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Drag "optiboot_atmega328.hex" onto the CircuitPython disk drive, then open REPL!
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"""
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import board
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import busio
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import pulseio
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import adafruit_avrprog
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spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
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avrprog = adafruit_avrprog.AVRprog()
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avrprog.init(spi, board.D5)
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#pylint: disable-msg=no-member
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# we can generate an 6 MHz clock for driving bare chips too!
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clock_pwm = pulseio.PWMOut(board.D9, frequency=6000000, duty_cycle=65536//2)
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#pylint: enable-msg=no-member
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# Each chip has to have a definition so the script knows how to find it
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atmega328p = {'name': "ATmega328P"}
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atmega328p['sig'] = [0x1E, 0x95, 0x0F]
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atmega328p['flash_size'] = 32768
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atmega328p['page_size'] = 128
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atmega328p['fuse_mask'] = (0xFF, 0xFF, 0x07, 0x3F)
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def error(err):
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""" Helper to print out errors for us and then halt """
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print("ERROR: "+err)
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avrprog.end()
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while True:
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pass
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while input("Ready to GO, type 'G' here to start> ") != 'G':
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pass
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if not avrprog.verify_sig(atmega328p, verbose=True):
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error("Signature read failure")
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print("Found", atmega328p['name'])
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# Since we are unsetting the lock fuse, an erase is required!
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avrprog.erase_chip()
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avrprog.write_fuses(atmega328p, low=0xFF, high=0xDE, ext=0x05, lock=0x3F)
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if not avrprog.verify_fuses(atmega328p, low=0xFF, high=0xDE, ext=0x05, lock=0x3F):
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error("Failure programming fuses: "+str([hex(i) for i in avrprog.read_fuses(atmega328p)]))
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print("Programming flash from file")
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avrprog.program_file(atmega328p, "optiboot_atmega328.hex", verbose=True, verify=True)
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avrprog.write_fuses(atmega328p, lock=0x0F)
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if not avrprog.verify_fuses(atmega328p, lock=0x0F):
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error("Failure verifying fuses!")
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print("Done!")
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