Led Matrix
New MiniITX Board
VIA EPIA-PD
- http://www.i2c-bus.org/ very good read on i2c specs
- https://help.ubuntu.com/community/ViaEpiaDriHowto kernel stuff for i2c
- http://robots.net/article/983.html article on this board
- http://www.nxp.com/#/pip/pip=[pfp=41735]|pp=[v=d,t=pfp,i=41735,fi=,ps=0][0] i2c specs
- http://codesink.org/eeprog.html sample userland app using i2c on the via board
- http://www.linuxjournal.com/article/7136 i2c kernel driver linux stuff
There are three data transfer speeds for the I2C bus: standard, fast-mode, and high-speed mode. Standard is 100 Kbps. Fast-mode is 400 Kbps, and high-speed mode supports speeds up to 3.4 Mbps. All are backward compatible. The I2C bus supports 7-bit and 10-bit address space devices and devices that operate under different voltages.
Ohoh
http://archives.andrew.net.au/lm-sensors/msg29149.html
100kHz and 400kHz are *maximum* frequency for standard and high-speed
- I2C* busses. What your VIA bridge really is is an SMBus, so it must run
at a speed between 10kHz and 100kHz if I remember correctly.
As a matter of fact, I already measured both my VIA and Intel SMBus chips at 16kHz, exactly like you. So I am not surprised at all by what you are reporting.
kernel patch UNTESTED:
http://archives.andrew.net.au/lm-sensors/msg29186.html
