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 Readme for:  Development » Example » ramdev.lha

Ramdev

Description: simple 4 unit ram device (example source)
Download: ramdev.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 23kb
Version: 51.1
Date: 20 Jun 06
Author: Olaf Barthel, Fredrik Wikstrom (OS4 port and modifications)
Submitter: Fredrik Wikstrom
Email: fredrik/a500 org
Homepage: http://a500.org
Category: development/example
License: Public domain
Distribute: yes
Min OS Version: 4.0
FileID: 1893
 
Comments: 1  [View]
Snapshots: 0  [View]
Downloads: 56  (Current version)
56  (Accumulated)

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/************************************************************************
*
* ramdev.c -- Skeleton device code.
*
* A sample 4 unit ramdisk that can be bound to an expansion slot device,
* or used without.  Works with the Fast File System.
* This code is required reading for device driver writers.  It contains
* information not found elsewhere.
*
* This example includes a task, though a task is not actually needed for
* a simple ram disk.  Unlike a single set of hardware registers that
* may need to be shared by multiple tasks, ram can be freely shared.
* This example does not show arbitration of hardware resources.
*
************************************************************************/

v51.1 changes (Fredrik Wikstrom):
 - is now an OS4 device
 - uses CreateTask()/DeleteTask() as opposed to setting up the Task structure
(stack, etc.) manually
 - supports the NSCMD_DEVICEQUERY command (reports itself as a trackdisk type
device)

Hopefully this will make it easier for people to write device drivers for OS4...



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