Difference between revisions of "I2C"
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# ''Basic I2C working from Gumstix (completed)'' | # ''Basic I2C working from Gumstix (completed)'' | ||
# VFAT powered on and responding to I2C | # VFAT powered on and responding to I2C | ||
| − | # I2C controlled from C program on Gumstix | + | # I2C controlled from a C program on Gumstix |
# I2C transmission line testing | # I2C transmission line testing | ||
| + | # Interface Gumstix to controller computer (sockets/web?) | ||
== Stuff to buy == | == Stuff to buy == | ||
Revision as of 18:22, 7 June 2007
Parameters for the operation of the VFAT board are downloaded to the chip using the I2C protocol.
A good overview of I2C is available on wikipedia
Electrical Characteristics
The I2C specification limits the I2C bus capacitance to 400pF. The cat5e wire specification limits wire capacitance to 50pF/m, so we should be able to push I2C at least 8m. Testing is needed, but by lowering the bus clock and the pull-up resistors a much greater length should be possible.
Task List
- Basic I2C working from Gumstix (completed)
- VFAT powered on and responding to I2C
- I2C controlled from a C program on Gumstix
- I2C transmission line testing
- Interface Gumstix to controller computer (sockets/web?)
Stuff to buy
- Power Supply
- Gumstix (x2)
- Motherboard
- Network card
- Breakout Board
- Power Plug
- CF Card
- I2C expanders
- I2C eproms (for feedback testing)
- header pins
- header pin connectors