From 2d0ed0442c7c668b0cf8aee084382cb916a3cd92 Mon Sep 17 00:00:00 2001 From: Bernd Porr Date: Thu, 3 May 2012 01:24:22 +0100 Subject: [PATCH] Added a couple of sentences about async acquisition and the two modes cards do it and then mentioned our new board_info. --- doc/tutorial.xml | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/doc/tutorial.xml b/doc/tutorial.xml index 5ca284e..3344d2a 100644 --- a/doc/tutorial.xml +++ b/doc/tutorial.xml @@ -132,6 +132,26 @@ This technique is used in programs such as ktimetrace or comedirecord. + + There are two different ways how a sequence of channels is + measured during asynchronous acquisition (see also the Figure in + the introduction): + + + The channels are measured with the help + of a multiplexer which switches to the next channel after each measurement. + This means that the sampling rate is divided by the number + of channels. + + + The channels are all measured at the same time, for example + when every channel has its own converter. In this case the + sampling rate need not to be divided by the number of channels. + + + How your &comedi; device handles the asynchronous acquisition can be found out + with the command comedi_board_info -v. + The program tut3.c demonstrates the asynchronous acquisition. The general strategy is always -- 2.26.2