48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
"""
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Trinket/Gemma (ATtiny85) programming example, be sure you have the '85 wired up so:
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Trinket Ground to CircuitPython GND
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Trinket USB to CircuitPythong USB or make sure the Trinket is powered by USB
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Pin 2 -> CircuitPython SCK
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Pin 1 -> CircuitPython MISO
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Pin 0 -> CircuitPython MOSI
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RESET -> CircuitPython D5 (or change the init() below to change it!)
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Drag "trinket_boot.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 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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# Each chip has to have a definition so the script knows how to find it
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attiny85 = {'name': "ATtiny85"}
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attiny85['sig'] = [0x1E, 0x93, 0x0B]
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attiny85['flash_size'] = 8192
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attiny85['page_size'] = 64
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attiny85['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(attiny85, verbose=True):
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error("Signature read failure")
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print("Found", attiny85['name'])
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avrprog.write_fuses(attiny85, low=0xF1, high=0xD5, ext=0x06, lock=0x3F)
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if not avrprog.verify_fuses(attiny85, low=0xF1, high=0xD5, ext=0x06, lock=0x3F):
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error("Failure verifying fuses!")
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print("Programming flash from file")
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avrprog.program_file(attiny85, "trinket_boot.hex", verbose=True, verify=True)
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print("Done!")
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