/* stop the stopwatch, and return the time */
u32 timer_stop(void)
{
/* stop the timer */
BIT_CLR(TIMER32(TMRCONTROL), RUN);
/* get access to counter */
BIT_SET(TIMER32(TMRCONTROL), LDCNT);
return TIMER32(TMRCOUNT);
}
/* start the stopwatch */
void timer_start(void)
{
/* make sure the timer is stopped */
BIT_CLR(TIMER32(TMRCONTROL), RUN);
/* zero out the timer */
TIMER32(TMRCOUNT) = 0;
/* run the timer */
BIT_SET(TIMER32(TMRCONTROL), RUN);
}
/* Pre-initialize a timer; set values but don't start it */
int timer_prime(int which, uint32 speed, int interrupts) {
/* P0/64 scalar, maybe interrupts */
if (interrupts)
TIMER16(tcrs[which]) = 32 | 2;
else
TIMER16(tcrs[which]) = 2;
/* Initialize counters; formula is P0/(tps*64) */
TIMER32(tcnts[which]) = 50000000 / (speed*64);
TIMER32(tcors[which]) = 50000000 / (speed*64);
return 0;
}
void tmr_poll_start(u16 val)
{
/* make sure the timer is stopped */
BIT_CLR(TIMER32(TMRCONTROL), RUN);
/* zero out the timer */
TIMER32(TMRCOUNT) = 0;
/* run the timer */
BIT_SET(TIMER32(TMRCONTROL), RUN);
value = val;
}
/* Pre-initialize a timer as do it the BIOS; set values but don't start it */
int timer_prime_bios(int which) {
/* Stop timer */
TIMER8(TSTR) &= ~(1 << which);
TIMER16(tcrs[which]) = 2;
TIMER32(tcnts[which]) = 0xFFFFFFFF;
TIMER32(tcors[which]) = 0xFFFFFFFF;
/* Clears the timer underflow bit */
TIMER16(tcrs[which]) &= ~0x100;
return 0;
}
void timer_init(void)
{
// commented out due to bug!?
/* make sure the timer is stopped */
//BIT_CLR(TIMER32(TMRCONTROL), RUN);
/* set up the clock */
//TIMER32(TMRCONTROL) &= ~(3<<SETCLK);
//TIMER32(TMRCONTROL) |= (TIMER_CLK<<SETCLK);
TIMER32(TMRCLKGEN) = (TIMER_PRES<<TCLKDIV)|(TIMER_CLK_SRC<<TCLKSRCSEL);
BIT_SET(TIMER32(TMRCLKENB), TCLKGENENB);
}
u8 tmr_poll_has_expired(void)
{
BIT_CLR(TIMER32(TMRCONTROL), RUN);
BIT_SET(TIMER32(TMRCONTROL), LDCNT);
u32 timer = TIMER32(TMRCOUNT);
//db_puts("TIMER:");db_int (timer);db_puts(" ");
//db_puts("VALUE:");db_int (value * 8197);db_puts("\n");
BIT_SET(TIMER32(TMRCONTROL), RUN);
if (timer >= (value * 8197))
return 1;
else
return 0;
}
/* Pre-initialize a timer for CDDA; set values but don't start it */
int timer_prime_cdda(int which, uint32 count) {
/* Stop timer */
TIMER8(TSTR) &= ~(1 << which);
/* External clock */
TIMER16(tcrs[which]) = 3;
/* Initialize counters */
TIMER32(tcnts[which]) = count;
TIMER32(tcors[which]) = count;
/* Clears the timer underflow bit */
TIMER16(tcrs[which]) &= ~0x100;
return 0;
}
/* Returns the count value of a timer */
uint32 timer_count(int which) {
return TIMER32(tcnts[which]);
}
