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tools: widen frequency resolution to µs in the DPI tool

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The Microsoft Arc Touch Mouse claims 8000fps which is higher than we can
measure in the current milliseconds resolution.
http://www.cnet.com/products/microsoft-arc-touch-mouse-black-series/specs/

https://bugs.freedesktop.org/show_bug.cgi?id=90540

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2015-05-21 11:48:34 +10:00
parent 6f03fd49fb
commit e1d87fa6df
1 changed files with 10 additions and 10 deletions
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20
tools/mouse-dpi-tool.c
View file

@ -44,7 +44,7 @@
struct measurements { struct measurements {
int distance; int distance;
double frequency; double frequency;
uint32_t ms; uint64_t us;
}; };
static int static int
@ -58,16 +58,16 @@ usage(void) {
return 1; return 1;
} }
static inline uint32_t static inline uint64_t
tv2ms(const struct timeval *tv) tv2us(const struct timeval *tv)
{ {
return tv->tv_sec * 1000 + tv->tv_usec/1000; return tv->tv_sec * 1000000 + tv->tv_usec;
} }
static inline double static inline double
get_frequency(double last, double current) get_frequency(double last, double current)
{ {
return 1000.0/(current - last); return 1000000.0/(current - last);
} }
static int static int
@ -98,17 +98,17 @@ static int
handle_event(struct measurements *m, const struct input_event *ev) handle_event(struct measurements *m, const struct input_event *ev)
{ {
if (ev->type == EV_SYN) { if (ev->type == EV_SYN) {
const int idle_reset = 3000; /* ms */ const int idle_reset = 3000000; /* us */
uint32_t last_millis = m->ms; uint64_t last_us = m->us;
m->ms = tv2ms(&ev->time); m->us = tv2us(&ev->time);
/* reset after pause */ /* reset after pause */
if (last_millis + idle_reset < m->ms) { if (last_us + idle_reset < m->us) {
m->frequency = 0.0; m->frequency = 0.0;
m->distance = 0; m->distance = 0;
} else { } else {
double freq = get_frequency(last_millis, m->ms); double freq = get_frequency(last_us, m->us);
m->frequency = max(freq, m->frequency); m->frequency = max(freq, m->frequency);
return print_current_values(m); return print_current_values(m);
} }