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Directory structure: technology/interface.

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README.md
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@ -36,7 +36,14 @@ allocation tables in the low numbered sectors. Under `littlefs` I would expect
the endurance to be substantially better owing to its wear levelling
architecture.
## 1.3 Supported chips
## 1.3 Organisation of this repo
The directory structure is `technology/interface` where supported chips for a
given technology offer SPI and I2C interfaces; where only one interface exists
the `interface` subdirectory is omitted. The file `bdevice.py` is common to all
drivers and is in the root directory.
## 1.4 Supported chips
These currently include Microchip and STM EEPROM chips and
[this Adafruit FRAM board](http://www.adafruit.com/product/1895). Note that the
@ -50,25 +57,25 @@ M95M02-DRMN6TP and M95M02-DWMN3TP/K. The latter has a wider temperature range.
In the table below the Interface column includes page size in bytes.
| Manufacturer | Part | Interface | Bytes | Technology | Docs |
|:------------:|:---------:|:---------:|:------:|:----------:|:----------------------------:|
| Cypress | S25FL256L | SPI 4096 | 32MiB | Flash | [FLASH.md](./flash/FLASH.md) |
| Cypress | S25FL128L | SPI 4096 | 16MiB | Flash | [FLASH.md](./flash/FLASH.md) |
| STM | M95M02-DR | SPI 256 | 256KiB | EEPROM | [SPI.md](./spi/SPI.md) |
| Microchip | 25xx1024 | SPI 256 | 128KiB | EEPROM | [SPI.md](./spi/SPI.md) |
| Microchip | 24xx512 | I2C 128 | 64KiB | EEPROM | [I2C.md](./i2c/I2C.md) |
| Microchip | 24xx256 | I2C 128 | 32KiB | EEPROM | [I2C.md](./i2c/I2C.md) |
| Microchip | 24xx128 | I2C 128 | 16KiB | EEPROM | [I2C.md](./i2c/I2C.md) |
| Microchip | 24xx64 | I2C 128 | 8KiB | EEPROM | [I2C.md](./i2c/I2C.md) |
| Adafruit | 1895 | I2C n/a | 32KiB | FRAM | [FRAM.md](./fram/FRAM.md) |
| Manufacturer | Part | Interface | Bytes | Technology | Docs |
|:------------:|:---------:|:---------:|:------:|:----------:|:-----------------------------:|
| Cypress | S25FL256L | SPI 4096 | 32MiB | Flash | [FLASH.md](./flash/FLASH.md) |
| Cypress | S25FL128L | SPI 4096 | 16MiB | Flash | [FLASH.md](./flash/FLASH.md) |
| STM | M95M02-DR | SPI 256 | 256KiB | EEPROM | [SPI.md](./eeprom/spi/SPI.md) |
| Microchip | 25xx1024 | SPI 256 | 128KiB | EEPROM | [SPI.md](./eeprom/SPI.md) |
| Microchip | 24xx512 | I2C 128 | 64KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
| Microchip | 24xx256 | I2C 128 | 32KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
| Microchip | 24xx128 | I2C 128 | 16KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
| Microchip | 24xx64 | I2C 128 | 8KiB | EEPROM | [I2C.md](./eeprom/i2c/I2C.md) |
| Adafruit | 1895 | I2C n/a | 32KiB | FRAM | [FRAM.md](./fram/FRAM.md) |
Documentation:
[SPI.md](./spi/SPI.md)
[I2C.md](./i2c/I2C.md)
[SPI.md](./eeprom/spi/SPI.md)
[I2C.md](./eeprom/i2c/I2C.md)
[FRAM.md](./fram/FRAM.md)
[FLASH.md](./flash/FLASH.md)
## 1.4 Performance
## 1.5 Performance
FRAM is truly byte-addressable: its speed is limited only by the speed of the
I2C interface.

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i2c/I2C.md → eeprom/i2c/I2C.md
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@ -20,6 +20,8 @@ the subsequent improvements to MicroPython to achieve these advantages:
7. Alternatively it can support byte-level access using Python slice syntax.
8. RAM allocations are reduced.
##### [Main readme](../../README.md)
# 2. Connections
Any I2C interface may be used. The table below assumes a Pyboard running I2C(2)
@ -168,7 +170,7 @@ advantage when reading of using a pre-allocated buffer. Arguments:
### 4.1.3 Other methods
#### The len() operator
#### The len operator
The size of the EEPROM array in bytes may be retrieved by issuing `len(eep)`
where `eep` is the `EEPROM` instance.

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i2c/eeprom_i2c.py → eeprom/i2c/eeprom_i2c.py
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spi/SPI.md → eeprom/spi/SPI.md
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@ -18,6 +18,8 @@ The driver has the following attributes:
7. Alternatively it can support byte-level access using Python slice syntax.
8. RAM allocations are minimised. Buffer sizes are tiny.
##### [Main readme](../../README.md)
## 1.1 This document
Code samples assume one or more Microchip devices. If using the STM chip the
@ -177,7 +179,7 @@ advantage when reading of using a pre-allocated buffer. Arguments:
### 4.1.3 Other methods
#### The len() operator
#### The len operator
The size of the EEPROM array in bytes may be retrieved by issuing `len(eep)`
where `eep` is the `EEPROM` instance.

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spi/eep_spi.py → eeprom/spi/eep_spi.py
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spi/eeprom_spi.py → eeprom/spi/eeprom_spi.py
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flash/FLASH.md
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@ -25,6 +25,8 @@ its resilience and wear levelling characteristics.
Byte level access on such large devices probably has few use cases other than
for facilitating effective hardware tests and diagnostics.
##### [Main readme](../README.md)
# 2. Connections
Any SPI interface may be used. The table below assumes a Pyboard running SPI(2)