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Tidy up of SpinDelay

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This commit is contained in:
d18c7db 2009-07-19 03:47:01 +00:00
commit 5e6a0b2369
1 changed files with 20 additions and 35 deletions
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31
armsrc/util.c
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@ -193,6 +193,8 @@ int BUTTON_HELD(int ms)
return BUTTON_ERROR; return BUTTON_ERROR;
} }
// attempt at high resolution microsecond timer
// beware: timer counts in 21.3uS increments (1024/48Mhz)
void SpinDelayUs(int us) void SpinDelayUs(int us)
{ {
int ticks = (48*us) >> 10; int ticks = (48*us) >> 10;
@ -207,29 +209,6 @@ void SpinDelayUs(int us)
WORD start = (WORD)PWM_CH_COUNTER(0); WORD start = (WORD)PWM_CH_COUNTER(0);
for(;;) { for(;;) {
WORD now = (WORD)PWM_CH_COUNTER(0);
if(now == (WORD)(start + ticks)) {
return;
}
WDT_HIT();
}
}
void SpinDelay(int ms)
{
int ticks = (48000*ms) >> 10;
// Borrow a PWM unit for my real-time clock
PWM_ENABLE = PWM_CHANNEL(0);
// 48 MHz / 1024 gives 46.875 kHz
PWM_CH_MODE(0) = PWM_CH_MODE_PRESCALER(10);
PWM_CH_DUTY_CYCLE(0) = 0;
PWM_CH_PERIOD(0) = 0xffff;
WORD start = (WORD)PWM_CH_COUNTER(0);
for(;;)
{
WORD now = (WORD)PWM_CH_COUNTER(0); WORD now = (WORD)PWM_CH_COUNTER(0);
if (now == (WORD)(start + ticks)) if (now == (WORD)(start + ticks))
return; return;
@ -237,3 +216,9 @@ void SpinDelay(int ms)
WDT_HIT(); WDT_HIT();
} }
} }
void SpinDelay(int ms)
{
// convert to uS and call microsecond delay function
SpinDelayUs(ms*1000);
}