OpenEuphoria

Data Acquisition

• Posted by Mike <vulcan at win.co.nz> Oct 01, 2002
• 391 views

Win32 coders,

I need some advice on a data acquisition project I have.
Basically, a continuous series of batches of bytes is supposed to be 
acquired by the system and processed. From what I understand, Euphoria 
is not reentrant and an event must have finished being processed before 
another one can be started. I presume that this also holds true for 
EU_to_C programs, right? The problem as I see it is this: Because Eu 
programs are not reentrant and because there will be
a huge amount of program latency to process each batch of bytes, I am 
worried that my code will not be able to service each NEW_BATCH_EVENT in 
a timely manner. I am not intending to use a data acquisition card but 
will grab the data either using the printer port or maybe using a (very 
inexpensive) digital I/O card. I will be reserving a huge buffer in 
memory to store each new batch but since there is no buffer (that I know 
of) associated with the intended acquisition devices I am fairly sure 
that timeouts will occur from time to time and I really
cannot afford to lose any of the data.
The system will be Win95 and each batch will be several k long. I am 
expecting that a Eu program will actually capture the data and plonk it 
straight into the memory buffer. The external device sending the data in 
will be a microcontroller and it will be able to hold just over 1 batch 
of data in it's memory but will be acquiring data more or less 
continuously.

Ideas, anyone?

Regards,
Mike