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I need to read and write to an I2C bus which is connected through an adaptor to the parallel port of a computer. The I2C bus can run at 400kHz frequency.
I saw that in Linux there is an i2c-parport adaptor already implemented but I have problems using it.
Can anyone tell me what steps should I follow to use this available adaptor or to implement my own?
So, write to 0x378 with bit 0 and bit 1 as clock and data. Use a short timer to get 400KHz timing for the clock and the data.
What else do you need to know?
I have done a I2C communicator many years ago in a 80186 microcontroller.
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Mats
Thanks for the reply!
If I understand you correctly, I should write 0s and 1s on the SDA and SCL pins of the parallel port. But how do I assure synchronization to respect timing conditions?
Do you have happen to have some source code ?
No, the code I _HAD_ was written in 16-bit x86 assembler anyways, so not much use.
What problem with timing are you trying to solve? As long as you make sure the clock and data (SCL and SDA) changes in synch with each other, there should be no problem.
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Mats
That was exactly my question: how to make sure that SCL and SDA changes in sync?
I am using Ubuntu Linux...
Just change the value in one operation (so you only do ONE output to the port per change of both SCL and SDA).Quote:
Originally Posted by bogdan
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Mats
Many thanks for the quick responses. I will try it to see if it works.