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Reduce number of control messages for clock update 

Compare the stored clock value against the requested value and only
send the USB vendor control messages if necessary. This should reduce
the number of messages from 5 for every clock update to 1-3, depending
on whether the date has changed or not. Only if the timezone of the
default clock changes should the additional 2 messages for the offset
clocks be sent.
pull/10/head
nirenjan 2015-12-11 09:04:54 -08:00
parent 320e3c85dc
commit b0309b1b40
2 changed files with 43 additions and 12 deletions
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2
libx52/Makefile.am
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@ -5,7 +5,7 @@ lib_LTLIBRARIES = libx52.la
# Core libx52 library
# This library handles the USB communication between the host and the X52
libx52_la_SOURCES = x52_control.c x52_core.c x52_date_time.c x52_mfd_led.c
libx52_la_LDFLAGS = -version-info 2:0:1 -lusb-1.0
libx52_la_LDFLAGS = -version-info 2:1:1 -lusb-1.0
# Header files that need to be copied
x52includedir = $(includedir)/x52pro-@X52_PKG_VERSION@

53
libx52/x52_date_time.c
View File

@ -22,6 +22,13 @@
int libx52_set_clock(libx52_device *x52, time_t time, int local)
{
struct tm timeval;
int local_tz;
int local_date_day;
int local_date_month;
int local_date_year;
int local_time_hour;
int local_time_minute;
if (!x52) {
return -EINVAL;
}
@ -31,23 +38,47 @@ int libx52_set_clock(libx52_device *x52, time_t time, int local)
/* timezone from time.h presents the offset in seconds west of GMT.
* Negate and divide by 60 to get the offset in minutes east of GMT.
*/
x52->timezone[LIBX52_CLOCK_1] = -timezone / 60;
local_tz = -timezone / 60;
} else {
timeval = *gmtime(&time);
/* No offset from GMT */
x52->timezone[LIBX52_CLOCK_1] = 0;
local_tz = 0;
}
x52->date_day = timeval.tm_mday;
x52->date_month = timeval.tm_mon + 1;
x52->date_year = timeval.tm_year % 100;
x52->time_hour = timeval.tm_hour;
x52->time_minute = timeval.tm_min;
local_date_day = timeval.tm_mday;
local_date_month = timeval.tm_mon + 1;
local_date_year = timeval.tm_year % 100;
local_time_hour = timeval.tm_hour;
local_time_minute = timeval.tm_min;
set_bit(&x52->update_mask, X52_BIT_MFD_DATE);
set_bit(&x52->update_mask, X52_BIT_MFD_TIME);
set_bit(&x52->update_mask, X52_BIT_MFD_OFFS1);
set_bit(&x52->update_mask, X52_BIT_MFD_OFFS2);
/* Update the date only if it has changed */
if (x52->date_day != local_date_day ||
x52->date_month != local_date_month ||
x52->date_year != local_date_year) {
x52->date_day = local_date_day;
x52->date_month = local_date_month;
x52->date_year = local_date_year;
set_bit(&x52->update_mask, X52_BIT_MFD_DATE);
}
/* Update the time only if it has changed */
if (x52->time_hour != local_time_hour ||
x52->time_minute != local_time_minute) {
x52->time_hour = local_time_hour;
x52->time_minute = local_time_minute;
set_bit(&x52->update_mask, X52_BIT_MFD_TIME);
}
/* Update the offset fields only if the timezone has changed */
if (x52->timezone[LIBX52_CLOCK_1] != local_tz) {
set_bit(&x52->update_mask, X52_BIT_MFD_OFFS1);
set_bit(&x52->update_mask, X52_BIT_MFD_OFFS2);
}
/* Save the timezone */
x52->timezone[LIBX52_CLOCK_1] = local_tz;
return 0;
}