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README fixes.

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Peter Hinch 2019-12-11 09:35:37 +00:00
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README.md
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@ -1,7 +1,7 @@
# 1. micropython_eeprom # 1. A MicroPython EEPROM driver
A driver to enable MicroPython to access Microchip EEPROM devices. Unlike flash This enables MicroPython to access Microchip EEPROM devices. Unlike flash
memory EEPROMs may be written on a byte addressable basis. Its endurance is memory, EEPROMs may be written on a byte addressable basis. Its endurance is
specified as a million writes compared to the 10K typical of most flash memory. specified as a million writes compared to the 10K typical of most flash memory.
In applications such as data logging the latter can be exceeded relatively In applications such as data logging the latter can be exceeded relatively
rapidly. rapidly.
@ -59,13 +59,15 @@ Multiple chips should have 3V3, Gnd, SCL and SDA lines wired in parallel.
The I2C interface requires pullups, typically 3.3KΩ to 3.3V although any value The I2C interface requires pullups, typically 3.3KΩ to 3.3V although any value
up to 10KΩ will suffice. The Pyboard 1.x has these on board. The Pyboard D has up to 10KΩ will suffice. The Pyboard 1.x has these on board. The Pyboard D has
them only on I2C(1). If you use a Pyboard D and power the EEPROMs from the 3V3 them only on I2C(1). Even if boards have pullups, additional externalresistors
output you will need to enable the voltage rail by issuing: will do no harm.
If you use a Pyboard D and power the EEPROMs from the 3V3 output you will need
to enable the voltage rail by issuing:
```python ```python
machine.Pin.board.EN_3V3.value(1) machine.Pin.board.EN_3V3.value(1)
``` ```
Other platforms may vary. Even if boards have pullups connecting external Other platforms may vary.
resistors will do no harm.
# 3. Files # 3. Files
@ -76,7 +78,7 @@ resistors will do no harm.
The driver supports mounting the EEPROM chips as a filesystem. Initially the The driver supports mounting the EEPROM chips as a filesystem. Initially the
device will be unformatted so it is necessary to issue code along these lines to device will be unformatted so it is necessary to issue code along these lines to
format the device. Code assumes a 64KiB device: format the device. Code assumes one or more 64KiB devices:
```python ```python
import uos import uos
@ -195,8 +197,8 @@ back, and checks the outcome. Existing array data will be lost.
## 5.3 fstest(format=False) ## 5.3 fstest(format=False)
If `True` is passed, formats the EEPROM array as a FAT filesystem and mounts If `True` is passed, formats the EEPROM array as a FAT filesystem and mounts
the device on `/eeprom`. If no arg is passed it simply the array and lists the the device on `/eeprom`. If no arg is passed it mounts the array and lists the
contents. contents. It also prints the outcome of `uos.statvfs` on the array.
## 5.4 File copy ## 5.4 File copy