Commit Graph

11 Commits

Author SHA1 Message Date
Oliver Schmidt
a5d7a06027 Enhanced Ethernet drivers.
Made Ethernet drivers easier to consume by assembly programs.
* Replaced function pointers with JMP instructions.
* Provide return values additionally via Carry flag.

Reset Ethernet chips on initialization.
Both for the CS8900A and the W5100 the data sheets just say that
the RESET bit is automatically cleared after the RESET. This may
be interpreted in two ways:
1) There's no need to be afraid of reading the RESET bit as 1 and
unintentionally trigger a RESET by writing it back after ORing in
some other bit.
2) The RESET process isn't complete before the RESET bit hasn't
become 0 again.
It's impossible for me to empirically falsify the latter option
as the drivers are supposed to work on faster machines than the
ones I have access to. And if the RESET process includes things
like oscillators then the time to complete the RESET could differ
even between multiple exemplars of the same chip. Therefore I
opted to presume the latter option.
However that means a non-exsistent chip may cause an infinite
loop while waiting for the RESET bit to be cleared so I finally
added code to detect the presence of the Ethernet chips. There's
a risk of a chip being locked up in a way that makes the detection
fail - and therefore the RESET not being performed. This catch-22
needs to be solved by the user doing a hard RESET.
2014-06-12 22:56:35 +02:00
Oliver Schmidt
1a5e20bc5f Remove tab chars from retro C sources. 2013-01-28 23:43:08 +01:00
Adam Dunkels
944537fccf Removed all old RCS tags in the Contiki source tree. Those RCS tags are not used any more, as we are now using git to manage the Contiki source tree 2012-10-26 15:54:49 +02:00
Nicholas J Humfrey
1cda3da17e Converted u8_t to uint8_t and u16_t to uint16_t in the cpu directory. 2012-02-21 08:33:24 -05:00
oliverschmidt
55d61d317b Allow cc65 ethernet drivers to be loaded statically instead of dynamically. This saved quite some space in scenarios without additional cc65 drivers to be loaded for i.e. a mouse because in those scenarios the cc65 module loader isn't necessary. And without the module loader typically the cc65 heap manager isn't necessary. 2010-09-28 23:02:16 +00:00
oliverschmidt
93ff3add1f Use cfs filesystem to allow for specific implementations. 2007-12-23 15:37:28 +00:00
oliverschmidt
102e3e2a24 Make use of fastcall. 2007-12-21 01:13:44 +00:00
oliverschmidt
f55b3cfe0e So we're finally back at reducing the memory footprint be avoiding to pull in large C-library enitities. 2007-12-16 17:02:37 +00:00
oliverschmidt
20824c5603 Make use of global error_exit(). 2007-11-27 20:52:52 +00:00
oliverschmidt
5608e2d451 Minor adjustment to predominant coding style. 2007-11-22 11:41:18 +00:00
oliverschmidt
da44474fd4 Generic Ethernet driver for cc65 targets. The actual hardware driver is loaded as relocatable module. 2007-11-20 21:10:20 +00:00