On 05/26/2010 06:12 PM, Michael Karcher wrote:
Am Mittwoch, den 26.05.2010, 19:23 +0200 schrieb Carl-Daniel Hailfinger:
+int rayer_bitbang_spi_init(void)
+{
+ /* Pick a default value for now. */
+ lpt_iobase = 0x378;
+
+ get_io_perms();
Ah, direct port access for the parallel port. While this is definitely
the way that works independent of the operating system (as it works
around the operating system), it is a pity to use this on operating
systems that have a clean parallel port bitbang interface. It happens to
be the case that Linux does support parallel port bitbanging
using /dev/parport. Any chance to use OS-specific parallel port
interfaces where possible?
AH, be careful here, using the Linux driver /dev/parport vs direct pport
access will surely slow things down. And with a parallel port you need
as much speed as possible. I guess it is a question of speed vs the
"proper" way....
--
Thanks,
Joseph Smith
Set-Top-Linux
www.settoplinux.org
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