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#include <generated/csr.h>
#include <time.h>
void time_init(void)
{
int t;
timer0_en_write(0);
t = 2*SYSTEM_CLOCK_FREQUENCY;
timer0_reload_write(t);
timer0_load_write(t);
timer0_en_write(1);
}
int elapsed(int *last_event, int period)
{
int t, dt;
timer0_update_value_write(1);
t = timer0_reload_read() - timer0_value_read();
if(period < 0) {
*last_event = t;
return 1;
}
dt = t - *last_event;
if(dt < 0)
dt += timer0_reload_read();
if((dt > period) || (dt < 0)) {
*last_event = t;
return 1;
} else
return 0;
}
void msleep(int ms)
{
timer0_en_write(0);
timer0_reload_write(0);
timer0_load_write(SYSTEM_CLOCK_FREQUENCY/1000*ms);
timer0_en_write(1);
timer0_update_value_write(1);
while(timer0_value_read()) timer0_update_value_write(1);
}
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