kopia lustrzana https://github.com/peterhinch/micropython_eeprom
README.md: Add comments re EEPROM chips.
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README.md
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README.md
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@ -59,24 +59,31 @@ These currently include Microchip and STM EEPROM chips and
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largest EEPROM chip uses SPI: see [below](./README.md#2-choice-of-interface)
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for a discussion of the merits and drawbacks of each interface.
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The EEPROM drivers have been updated to be generic. Page size can be auto
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detected and the drivers have been tested with a wide variety of chips in sizes
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from 256 bytes to 256KiB. Thanks are due to Abel Deuring for doing much of this
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testing. That said, it is not possible to guarantee that all possible device
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types will work.
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Supported devices. Microchip manufacture each chip in different variants with
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letters denoted by "xx" below. The variants cover parameters such as minimum
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Vcc value and do not affect the API. There are two variants of the STM chip,
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M95M02-DRMN6TP and M95M02-DWMN3TP/K. The latter has a wider temperature range.
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In the table below the Interface column includes page size in bytes.
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The interface column includes page size where relevant. The EEPROM driver can
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auto-detect this and report it for a given chip.
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| Manufacturer | Part | Interface | Bytes | Technology | Docs |
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|:------------:|:---------:|:---------:|:-------:|:----------:|:-----------------------------:|
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| Various | Various | SPI 4096 | <=32MiB | Flash | [FLASH.md](./flash/FLASH.md) |
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| STM | M95M02-DR | SPI 256 | 256KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
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| Microchip | 25xx1024 | SPI 256 | 128KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
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| Microchip | 25xx512* | SPI 256 | 64KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
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| Microchip | 24xx512 | I2C 128 | 64KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx256 | I2C 128 | 32KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx128 | I2C 128 | 16KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx64 | I2C 128 | 8KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx32 | I2C 32 | 4KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| STM | M95M02-DR | SPI | 256KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
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| Microchip | 25xx1024 | SPI | 128KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
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| Microchip | 25xx512* | SPI | 64KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
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| Microchip | 24xx512 | I2C | 64KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx256 | I2C | 32KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx128 | I2C | 16KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx64 | I2C | 8KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Microchip | 24xx32 | I2C | 4KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
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| Adafruit | 4719 | SPI n/a | 512KiB | FRAM | [FRAM_SPI.md](./fram/FRAM_SPI.md) |
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| Adafruit | 4718 | SPI n/a | 256KiB | FRAM | [FRAM_SPI.md](./fram/FRAM_SPI.md) |
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| Adafruit | 1895 | I2C n/a | 32KiB | FRAM | [FRAM.md](./fram/FRAM.md) |
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@ -176,7 +183,7 @@ class.
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A consequence of the above is that the page size in the ioctl does not have any
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necessary connection with the memory hardware, so the drivers enable the value
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to be specified as a constructor argument. Littlefs requires a minimum size of
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128 bytes -
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128 bytes -
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[theoretically 104](https://github.com/ARMmbed/littlefs/blob/master/DESIGN.md).
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The drivers only allow powers of 2: in principle 128 bytes could be used. The
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default in MicroPython's littlefs implementation is 512 bytes and all testing
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