kopia lustrzana https://github.com/peterhinch/micropython_eeprom
Merge pull request #22 from adeuring/master
Add support for I2C EEPROMs with page sizes other than 128 in eeprom_…pull/23/head
commit
b5e9bcb160
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@ -132,6 +132,7 @@ Arguments:
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is `2**block_size` so is 512 bytes by default.
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is `2**block_size` so is 512 bytes by default.
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5. `addr` override base address for first chip
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5. `addr` override base address for first chip
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6. `max_chips_count` override max_chips_count
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6. `max_chips_count` override max_chips_count
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7. `page_size=7` The binary logarithm of the page size of the EEPROMs, i.e., the page size in bytes is `2 ** page_size`. The page size may vary between chips from different manufacturers even for the same storage size. Note that specifying a too large value will most likely lead to data corruption in write operations. Look up the correct value for your setup in the chip's datasheet.
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With `addr` and `max_chips_count` override, it's possible to make multiple
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With `addr` and `max_chips_count` override, it's possible to make multiple
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configuration
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configuration
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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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print("Fail mounting device. Have you formatted it?")
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return
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return
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print("Mounted device.")
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print("Mounted device.")
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cp("eep_i2c.py", "/eeprom/")
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cp(__file__, "/eeprom/")
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cp("eeprom_i2c.py", "/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('Contents of "/eeprom": {}'.format(uos.listdir("/eeprom")))
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print(uos.statvfs("/eeprom"))
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print(uos.statvfs("/eeprom"))
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@ -19,7 +19,7 @@ T24C32 = const(4096) # 4KiB 32Kbits
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# Logical EEPROM device consists of 1-8 physical chips. Chips must all be the
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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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# same size, and must have contiguous addresses.
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class EEPROM(BlockDevice):
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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=7):
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self._i2c = i2c
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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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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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print("Warning: possible unsupported chip. Size:", chip_size)
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@ -29,6 +29,8 @@ class EEPROM(BlockDevice):
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self._i2c_addr = 0 # I2C address of current chip
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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._buf1 = bytearray(1)
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self._addrbuf = bytearray(2) # Memory offset into current chip
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self._addrbuf = bytearray(2) # Memory offset into current chip
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self._page_size = 2 ** page_size
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self._page_mask = ~(self._page_size - 1)
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# Check for a valid hardware configuration
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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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def scan(self, verbose, chip_size, addr, max_chips_count):
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@ -67,7 +69,7 @@ class EEPROM(BlockDevice):
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self._addrbuf[0] = (la >> 8) & 0xFF
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self._addrbuf[0] = (la >> 8) & 0xFF
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self._addrbuf[1] = la & 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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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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return min(nbytes, pe - la)
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# Read or write multiple bytes at an arbitrary address
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# Read or write multiple bytes at an arbitrary address
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