pyi2cflash 0.2.2

Description:

pyi2cflash 0.2.2

I2C eeprom device drivers (pure Python)
I2C flash devices, also known as DataFlash are commonly found in embedded
products, to store firmware, microcode or configuration parameters.
PyI2CFlash comes with several pure Python drivers for those flash devices, that
demonstrate use of I2C devices with PyFtdi. It could also be useful to dump
flash contents or recover from a bricked devices.

Supported I2C flash devices


Vendor
Microchip
Microchip
Microchip
Microchip
Microchip
Microchip
Microchip
Microchip
Microchip
Microchip

EEPROM
24AA01
24AA02
24AA04
24AA08
24AA16
24AA32A
24AA64
24AA128
24AA256
24AA512



Status
?
?
No
No
No
Ok
?
?
?
?

Size
128
256
512
1Ki
2Ki
4Ki
8Ki
16Ki
32Ki
64Ki




Notes about performances

Read operation is synchronous with I2C bus clock: it therefore only depends
on the achievable frequency on the I2C bus, which is bound to the highest
supported frequency of the flash device.
Write operation depends mostly on the flash device performance, whose upper
limit comes mostly from the maximum write packet size of the device, as the
device needs to be polled for completion after each packet: the shorter the
packet, the higher traffic on the I2C and associated overhead.



Notes about 24AA32
This device is declared obsolete by the manufacturer and is not supported.
Only 24AA32A revision is supported.



Supported I2C flash commands

Read
Read byte sequences of any size, starting at any location from the I2C
flash device

Write
Write arbitrary byte sequences of any size, starting at any location to the
I2C flash device




Dependencies

Python 3.5 or above is required.
PyFtdi 0.42 or above is required.