[En-Nut-Discussion] High Speed timer

[Ole Reinhardt]

Hi All,

I have an exactly timed application where I'd like to use NutOS.

excatly:

I have 48 relais that are all controlled by I2C IO expander circuits.
All these relais have to be switched by an exaclty controlled timed
sequence. These sequence needs to have a precision of 1ms.

AFAIK NutOS can not handle timer with a precision less than 62.5 ms?

Does anybody has an Idea how to implement this?

An nother question concerning thread switching:

If I use one of the AVR timers (Timer 2 for example) to generate the 1ms
pulses and use NutEventPostFromIRQ to signal a waiting thread that
should send out the i2c commands to switch the relais, what would be the
latancy of thread switching? Can I guaranty a latancy less than a ms?

Best regards,

Ole Reinhardt


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