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Gigabeat: Add timer functionality. Rework tick timer setup to be exactly 100Hz. Metronome should work now but some pcm changes are needed to have faster tocks work correctly (in the works).

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13806 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-07-06 21:36:32 +00:00
parent cbed7a2cd2
commit 4ae87c8b8a
8 changed files with 265 additions and 84 deletions
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36
firmware/kernel.c
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@ -29,7 +29,7 @@
volatile long current_tick NOCACHEDATA_ATTR = 0;
#endif
static void (*tick_funcs[MAX_NUM_TICK_TASKS])(void);
void (*tick_funcs[MAX_NUM_TICK_TASKS])(void);
/* This array holds all queues that are initiated. It is used for broadcast. */
static struct event_queue *all_queues[32] NOCACHEBSS_ATTR;
@ -708,40 +708,6 @@ void tick_start(unsigned int interval_in_ms)
TIMER0.ctrl |= 0x80; /* Enable the counter */
}
#elif CONFIG_CPU == S3C2440
void tick_start(unsigned int interval_in_ms)
{
TCON &= ~(1 << 20); // stop timer 4
// TODO: this constant depends on dividers settings inherited from
// firmware. Set them explicitly somwhere.
TCNTB4 = 12193 * interval_in_ms / 1000;
TCON |= 1 << 21; // set manual bit
TCON &= ~(1 << 21); // reset manual bit
TCON |= 1 << 22; //interval mode
TCON |= (1 << 20); // start timer 4
INTMOD &= ~(1 << 14); // timer 4 to IRQ mode
INTMSK &= ~(1 << 14); // timer 4 unmask interrupts
}
void TIMER4(void)
{
int i;
SRCPND = TIMER4_MASK;
INTPND = TIMER4_MASK;
/* Run through the list of tick tasks */
for(i = 0; i < MAX_NUM_TICK_TASKS; i++)
{
if(tick_funcs[i])
{
tick_funcs[i]();
}
}
current_tick++;
}
#endif
int tick_add_task(void (*f)(void))