kopia lustrzana https://github.com/peterhinch/micropython_eeprom
Add support for I2C EEPROMs with page sizes other than 128 in eeprom_i2c.py.
rodzic
98ebb3c7db
commit
208b3089bb
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@ -132,8 +132,10 @@ def cptest(eep=None): # Assumes pre-existing filesystem of either type
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print("Fail mounting device. Have you formatted it?")
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return
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print("Mounted device.")
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cp("eep_i2c.py", "/eeprom/")
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cp("eeprom_i2c.py", "/eeprom/")
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cp(__file__, "/eeprom/")
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# We may have the source file or a precompiled binary (*.mpy)
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suffix = __file__[__file__.rfind('.'):]
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cp("eeprom_i2c" + suffix, "/eeprom/")
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print('Contents of "/eeprom": {}'.format(uos.listdir("/eeprom")))
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print(uos.statvfs("/eeprom"))
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@ -16,10 +16,18 @@ T24C128 = const(16384) # 16KiB 128Kbits
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T24C64 = const(8192) # 8KiB 64Kbits
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T24C32 = const(4096) # 4KiB 32Kbits
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_PAGE_SIZES = {
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T24C32: const(0x20),
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T24C64: const(0x20),
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T24C128: const(0x40),
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T24C256: const(0x40),
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T24C512: const(0x80),
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}
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# Logical EEPROM device consists of 1-8 physical chips. Chips must all be the
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# same size, and must have contiguous addresses.
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class EEPROM(BlockDevice):
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def __init__(self, i2c, chip_size=T24C512, verbose=True, block_size=9, addr=_ADDR, max_chips_count=_MAX_CHIPS_COUNT):
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def __init__(self, i2c, chip_size=T24C512, verbose=True, block_size=9, addr=_ADDR, max_chips_count=_MAX_CHIPS_COUNT, page_size=None):
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self._i2c = i2c
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if chip_size not in (T24C32, T24C64, T24C128, T24C256, T24C512):
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print("Warning: possible unsupported chip. Size:", chip_size)
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@ -29,6 +37,16 @@ class EEPROM(BlockDevice):
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self._i2c_addr = 0 # I2C address of current chip
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self._buf1 = bytearray(1)
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self._addrbuf = bytearray(2) # Memory offset into current chip
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if page_size is None:
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if chip_size not in _PAGE_SIZES:
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raise ValueError(
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f'The page size for chip size {chip_size} is not known.'
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'Please specify it in the parameter page_size')
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self._page_mask = ~(_PAGE_SIZES[chip_size] - 1)
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self._page_size = _PAGE_SIZES[chip_size]
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else:
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self._page_mask = ~(page_size - 1)
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self._page_size = page_size
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# Check for a valid hardware configuration
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def scan(self, verbose, chip_size, addr, max_chips_count):
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@ -67,7 +85,7 @@ class EEPROM(BlockDevice):
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self._addrbuf[0] = (la >> 8) & 0xFF
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self._addrbuf[1] = la & 0xFF
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self._i2c_addr = self._min_chip_address + ca
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pe = (addr & ~0x7F) + 0x80 # byte 0 of next page
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pe = (addr & self._page_mask) + self._page_size # byte 0 of next page
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return min(nbytes, pe - la)
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# Read or write multiple bytes at an arbitrary address
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