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git-subtree-dir: plugins/USBPrinting git-subtree-mainline: 3823afd8cca1fe92b69082d51d0d50946b904e91 git-subtree-split: b28ca0881a6c2564f5447476f7b21de5645c10bd
67 lines
2.2 KiB
Python
67 lines
2.2 KiB
Python
"""
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General interface for Isp based AVR programmers.
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The ISP AVR programmer can load firmware into AVR chips. Which are commonly used on 3D printers.
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Needs to be subclassed to support different programmers.
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Currently only the stk500v2 subclass exists.
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This is a python 3 conversion of the code created by David Braam for the Cura project.
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"""
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from . import chipDB
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class IspBase():
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"""
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Base class for ISP based AVR programmers.
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Functions in this class raise an IspError when something goes wrong.
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"""
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def programChip(self, flashData):
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""" Program a chip with the given flash data. """
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self.curExtAddr = -1
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self.chip = chipDB.getChipFromDB(self.getSignature())
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if not self.chip:
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raise IspError("Chip with signature: " + str(self.getSignature()) + "not found")
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self.chipErase()
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print("Flashing %i bytes" % len(flashData))
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self.writeFlash(flashData)
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print("Verifying %i bytes" % len(flashData))
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self.verifyFlash(flashData)
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print("Completed")
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def getSignature(self):
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"""
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Get the AVR signature from the chip. This is a 3 byte array which describes which chip we are connected to.
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This is important to verify that we are programming the correct type of chip and that we use proper flash block sizes.
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"""
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sig = []
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sig.append(self.sendISP([0x30, 0x00, 0x00, 0x00])[3])
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sig.append(self.sendISP([0x30, 0x00, 0x01, 0x00])[3])
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sig.append(self.sendISP([0x30, 0x00, 0x02, 0x00])[3])
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return sig
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def chipErase(self):
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"""
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Do a full chip erase, clears all data, and lockbits.
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"""
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self.sendISP([0xAC, 0x80, 0x00, 0x00])
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def writeFlash(self, flashData):
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"""
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Write the flash data, needs to be implemented in a subclass.
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"""
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raise IspError("Called undefined writeFlash")
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def verifyFlash(self, flashData):
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"""
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Verify the flash data, needs to be implemented in a subclass.
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"""
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raise IspError("Called undefined verifyFlash")
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class IspError(BaseException):
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def __init__(self, value):
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self.value = value
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def __str__(self):
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return repr(self.value)
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