From c3ba569f877ba39230e92443b724bf3f4124f72b Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Wed, 9 May 2012 16:05:02 +0100 Subject: [PATCH] doc/glossary.xml: A few DocBook mark-up changes. --- doc/glossary.xml | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/doc/glossary.xml b/doc/glossary.xml index 1f93e28..0be93fc 100644 --- a/doc/glossary.xml +++ b/doc/glossary.xml @@ -34,8 +34,9 @@ buffer &comedi; uses permanently allocated kernel memory for streaming input and output to store data that has been measured by a device, but has not been read by an application. These buffers can be resized by the -Comedilib function comedi_buffer_XXX() or the -comedi_config +Comedilib functions comedi_set_buffer_size and +comedi_set_max_buffer_size or the +comedi_config utility. @@ -51,7 +52,7 @@ This is an error message that indicates that the driver ran out of space in a &comedi; buffer to put samples. It means that the application is not copying data out of the buffer quickly enough. Often, this problem can be fixed by making the &comedi; buffer larger. See -comedi_buffer_XXX for more information. +comedi_set_buffer_size for more information. @@ -79,7 +80,8 @@ a device and the main memory of a computer. DMA operates differently on ISA and PCI cards. ISA DMA is handled by a controller on the motherboard and is limited to transfers to/from the lowest 16 MB of physical RAM and can only handle a single segment of memory at a time. -These limitations make it almost useless. PCI ("bus mastering") DMA +These limitations make it almost useless. PCI (bus +mastering) DMA is handled by a controller on the device, and can typically address 4 GB of RAM and handle many segments of memory simultaneously. DMA is usually not the only means to data transfer, and may or may not @@ -178,7 +180,7 @@ option list -Option lists are used with comedi_config to +Option lists are used with the comedi_config utility to perform driver configuration. @@ -207,10 +209,10 @@ poll The term poll (and polling) is used for several different related concepts in &comedi;. &comedi; implements the -poll() system call for Comedi devices, which is -similar to select(), and returns information +poll system call for Comedi devices, which is +similar to select, and returns information about file descriptors that can be read or written. Comedilib also -has a function called comedi_poll(), which causes +has a function called comedi_poll, which causes the driver to copy all available data from the device to the &comedi; buffer. In addition, some drivers may use a polling technique in place of interrupts. -- 2.26.2