/** polling method. Call every frame. */
int readPads() {
int i;
oldpaddata = paddata;
paddata = 0;
// in ms.
u32 newtime = cpu_ticks() / CLOCKS_PER_MILISEC;
time_since_last = newtime - curtime;
curtime = newtime;
int rslt = 0;
for (i = 0; i < pad_count; ++i) {
rslt |= readPad(&pad_data[i]);
}
for (i = 0; i < 16; ++i) {
if (getKeyPressed(i + 1))
delaycnt[i] -= time_since_last;
else
delaycnt[i] = getKeyDelay(i + 1, 0);
}
return rslt;
}
static void
cpu_tick_calibrate(int reset)
{
static uint64_t c_last;
uint64_t c_this, c_delta;
static struct bintime t_last;
struct bintime t_this, t_delta;
uint32_t divi;
if (reset) {
/* The clock was stepped, abort & reset */
t_last.sec = 0;
return;
}
/* we don't calibrate fixed rate cputicks */
if (!cpu_tick_variable)
return;
getbinuptime(&t_this);
c_this = cpu_ticks();
if (t_last.sec != 0) {
c_delta = c_this - c_last;
t_delta = t_this;
bintime_sub(&t_delta, &t_last);
/*
* Headroom:
* 2^(64-20) / 16[s] =
* 2^(44) / 16[s] =
* 17.592.186.044.416 / 16 =
* 1.099.511.627.776 [Hz]
*/
divi = t_delta.sec << 20;
divi |= t_delta.frac >> (64 - 20);
c_delta <<= 20;
c_delta /= divi;
if (c_delta > cpu_tick_frequency) {
if (0 && bootverbose)
printf("cpu_tick increased to %ju Hz\n",
c_delta);
cpu_tick_frequency = c_delta;
}
}
