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Change timer setups for arbitrary CLOCK_CONF_SECOND

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Change raven to 128 ticks and enable 32KHz crystal as default.
This commit is contained in:
David Kopf 2011-08-05 15:14:35 -04:00
parent bfbc3234ea
commit c9b19ce655
6 changed files with 74 additions and 50 deletions
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16
cpu/avr/rtimer-arch.h
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@ -36,16 +36,22 @@
#include <avr/interrupt.h>
/* Nominal ARCH_SECOND is F_CPU/prescaler, e.g. 8000000/1024 = 7812 */
/* Nominal ARCH_SECOND is F_CPU/prescaler, e.g. 8000000/1024 = 7812
* Other prescaler values (1, 8, 64, 256) will give greater precision
* with shorter maximum intervals.
* Setting RTIMER_ARCH_PRESCALER to 0 will leave Timers alone.
* rtimer_arch_now() will then return 0, likely hanging the cpu if used.
* Timer1 is used if Timer3 is not available.
*/
#ifndef RTIMER_ARCH_PRESCALER
#define RTIMER_ARCH_PRESCALER 1024UL
#endif
#if RTIMER_ARCH_PRESCALER
#define RTIMER_ARCH_SECOND (F_CPU/RTIMER_ARCH_PRESCALER)
#else
#define RTIMER_ARCH_SECOND 0
#endif
/* Use TCNT1 if TCNT3 not available.
* Setting RTIMER_ARCH_PRESCALER to 0 will leave timer1 alone.
* Obviously this will disable rtimers.
*/
#ifdef TCNT3
#define rtimer_arch_now() (TCNT3)