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Altera_Forum
Honored Contributor
Honored ContributorYour hardware and uClinux
Hi again,
Adding an Avalon custom hardware and its software driver (either HAL or not) is easy and straightforward. Having said that I mean the standard Nios II IDE project_syslib/system_description/system.h way. Building a custom system that runs uClinux is also not an issue but haw can I use my Avalon hardware under uClinux? Thanks for any suggestions, Piotr.14 Replies
Altera_ForumI guess it depends if you want to build a proper Linux driver for your avalon hardware. The basic IRQ and base address for your hardware should appear within the
<project>/build/include/nios2_system.h file in your kernel project directory. If you're not interested in building a driver, then the hardware can be accessed from a regular Linux application as it would be in a non-HAL standalone application. If you're interested in building a driver, I think there was a thread in this forum to help you get started...- Altera_Forum--- Quote Start --- originally posted by ken@Nov 29 2004, 10:06 AM if you're not interested in building a driver, then the hardware can be accessed from a regular linux application as it would be in a non-hal standalone application. --- Quote End --- Let’s assume that I am not interested in the Linux driver, at least for now, and want to access my HW from uClinux application (which should be far easier for a hardware guy like me). This is not a problem from within a standalone non-HAL application: there are IOWR and IORD macros to use, but are there any equivalents of these in the uClinux environment?
- Altera_Forum
Fair enough, here's a code example that pokes around a hardware timer from a user application:
include Rules.mak ECLIPSE_WORKSPACE := /cygdrive/c/altera/kits/nios2/bin/eclipse/workspace KERNEL_PROJECT := uKit_kernel_default BUILDDIR := $(ECLIPSE_WORKSPACE)/$(KERNEL_PROJECT)/build/include CFLAGS += -O0 -g -I$(BUILDDIR) all: timer.exe timer.gdb
The first code segment is a Makefile and the second one is the timer.c file that is referenced within the Makefile. You'll notice the inclusion of the "nios2_system.h" header file within timer.c, that file is dynamically generated and can be found within a kernel project build/include directory. The two code segments can be copied into an application project and built after ensuring that you're referencing the correct kernel project. Does this help?#include <errno.h># include <stdio.h># include "nios2_system.h" int main (int argc, char* argv) { int i; np_timer *timer; timer = na_timer0; i = (timer->np_timerperiodh << 16) | timer->np_timerperiodl; printf ("timer period valud is %i \n", i); timer->np_timersnapl = 0; i = (timer->np_timersnaph << 16) | timer->np_timersnapl; printf ("The current timer value is %i\n", i); return 0; } - Altera_Forum
This is OK now. Thank you for your help Ken.
Regards, Piotr. - Altera_Forum
Hi i compiled this file and tried to start it under uClinux but i get allways this error message:
# cd /bin# timer BINFMT_FLAT: bad magic/rev <0x3000000, need 0x4> BINFMT_FLAT: bad magic/rev <0x3000000, need 0x4> MZ>: not found# Does anybody know something about this message? - Altera_Forum
Can I see your Makefile?
- Altera_Forum
hi ken,
<div class='quotetop'>QUOTE </div> --- Quote Start --- np_timer *timer;[/b] --- Quote End --- in timer.c Where is np_timer defined? - Altera_Forum
It's defined in the linux kernel...
.../linux-2.6.x/include/asm/nios2nommu/timer_struct.h - Altera_Forum
Hi Ken:
where are the other hardware_structs? For example lan91c111, dma,....... You have make the API? - Altera_Forum
All of that would be in the kernel includes directory...
[SOPC Builder]$ cd $KERNEL_PLUGIN/linux-2.6.x/include At least, that's where I'd expect to find them. I haven't checked in awhile.
