[Oslib-devel] PIT, the simplest example doesn't work

[Juras B. <yb...@tu...>]

Hello oslib-devel,


To clearfy I typed the simplest example of timer-using and
task-switching. The problem is that the timer IRQ handler
is called only once! :(

The make-file and the source follow:


=== makefile ===

BASE = /usr/local/oslib

include $(BASE)/config.mk

INCL   = $(BASE)
LIB_PATH    = $(BASE)/lib/
LIB_DIR  = $(BASE)\lib

OBJS = mtask.o

all: mtask.bin 

mtask.bin : $(OBJS)
        $(LD) $(LINK_OPT) $(LIB_PATH)x0.o $(OBJS) --start-group -lhc -lhx -lhm -lcons -lkl --end-group -o $@

=== end of makefile ===

=== mtask.c ===
#include <ll/stdlib.h>
#include <ll/sys/ll/ll-func.h>
#include <ll/i386/pit.h>
#include <ll/i386/pic.h>

CONTEXT thm,th0,th1;
CONTEXT contexts[3];
long active_c=0;

char stk0[256];
char stk1[256];

void timer_ev()
{
        active_c++;
        if (active_c>2) active_c=0;

        printf_xy(0,0,13,"T");

//      ll_context_to(contexts[active_c]); - works, but timer int is
// called once :(

}

void killer()
{
}

void procth0(void*p)
{
        while(1)
        {
                printf_xy(0,0,15,"0");

        }

}

void procth1(void*p)
{
        while(1)
        {
                printf_xy(0,0,15,"1");

        }

}


int main()
{
        ll_init();

        thm=ll_context_save();
        th0=ll_context_create(procth0,stk0,NULL,killer,0);
        th1=ll_context_create(procth1,stk1,NULL,killer,0);

        contexts[0]=thm;
        contexts[1]=th0;
        contexts[2]=th1;
        
        cli();
        pit_init(0,TMR_MD4,1000);
        l1_irq_bind(0,timer_ev);
        irq_unmask(0);
        sti();

        printf_xy(0,1,14,"Hello!");
        
        
        while(1)
        {
                printf_xy(0,0,15,"m");
        }

        
        return 0;
}
=== end of mtask.c ===

Why the timer handler is called only once?

-- 
Best regards,
 Juras                          mailto:yb...@tu...