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#include "common.h"
#include "support.h"
#include "spr_defs.h"
 
#define TICKS_PER_SEC 100
 
void tick_init(void)
{
  mtspr(SPR_SR, SPR_SR_TEE | mfspr(SPR_SR));
  mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((TICKS_PER_SEC/IN_CLK) & SPR_TTMR_PERIOD));
}
 
void tick_interrupt(void)
{
  timestamp++;
  mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((TICKS_PER_SEC/IN_CLK) & SPR_TTMR_PERIOD));
}