artiq/soc/runtime/clock.c

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#include <generated/csr.h>
#include "log.h"
#include "clock.h"
static int clkdiv;
void clock_init(void)
{
timer0_en_write(0);
timer0_load_write(0x7fffffffffffffffLL);
timer0_reload_write(0x7fffffffffffffffLL);
timer0_en_write(1);
clkdiv = identifier_frequency_read()/1000;
}
long long int clock_get_ms(void)
{
long long int clock_sys;
long long int clock_ms;
timer0_update_value_write(1);
clock_sys = 0x7fffffffffffffffLL - timer0_value_read();
clock_ms = clock_sys/clkdiv;
return clock_ms;
}
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void busywait_us(long long int us)
{
long long int threshold;
timer0_update_value_write(1);
threshold = timer0_value_read() - us*(long long int)identifier_frequency_read()/1000000LL;
while(timer0_value_read() > threshold)
timer0_update_value_write(1);
}
struct watchdog {
int active;
long long int threshold;
};
static struct watchdog watchdogs[MAX_WATCHDOGS];
void watchdog_init(void)
{
int i;
for(i=0;i<MAX_WATCHDOGS;i++)
watchdogs[i].active = 0;
}
int watchdog_set(int ms)
{
int i, id;
id = -1;
for(i=0;i<MAX_WATCHDOGS;i++)
if(!watchdogs[i].active) {
id = i;
break;
}
if(id < 0) {
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log("WARNING: Failed to add watchdog");
return id;
}
watchdogs[id].active = 1;
watchdogs[id].threshold = clock_get_ms() + ms;
return id;
}
void watchdog_clear(int id)
{
if((id < 0) || (id >= MAX_WATCHDOGS))
return;
watchdogs[id].active = 0;
}
int watchdog_expired(void)
{
int i;
long long int t;
t = 0x7fffffffffffffffLL;
for(i=0;i<MAX_WATCHDOGS;i++)
if(watchdogs[i].active && (watchdogs[i].threshold < t))
t = watchdogs[i].threshold;
return clock_get_ms() > t;
}