From 6668b65ef22c5ad6dd13b4a63de22763ff6f93da Mon Sep 17 00:00:00 2001 From: Brandon Low Date: Sun, 5 Mar 2006 18:19:46 +0000 Subject: Move the RTC read throttling to a smarter place git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8912 a1c6a512-1295-4272-9138-f99709370657 --- firmware/common/timefuncs.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-) (limited to 'firmware/common') diff --git a/firmware/common/timefuncs.c b/firmware/common/timefuncs.c index 81d5c493ec..19033a504e 100644 --- a/firmware/common/timefuncs.c +++ b/firmware/common/timefuncs.c @@ -20,6 +20,7 @@ #include /* get NULL */ #include "config.h" +#include "kernel.h" #include "rtc.h" #include "timefuncs.h" #include "debug.h" @@ -42,25 +43,29 @@ bool valid_time(const struct tm *tm) return true; } +static int last_tick = 0; struct tm *get_time(void) { #ifndef SIMULATOR #ifdef CONFIG_RTC - char rtcbuf[7]; - rtc_read_datetime(rtcbuf); + /* Don't read the RTC more than 4 times per second */ + if (last_tick + HZ/4 < current_tick) { + char rtcbuf[7]; + rtc_read_datetime(rtcbuf); - tm.tm_sec = ((rtcbuf[0] & 0x70) >> 4) * 10 + (rtcbuf[0] & 0x0f); - tm.tm_min = ((rtcbuf[1] & 0x70) >> 4) * 10 + (rtcbuf[1] & 0x0f); - tm.tm_hour = ((rtcbuf[2] & 0x30) >> 4) * 10 + (rtcbuf[2] & 0x0f); - tm.tm_wday = rtcbuf[3] & 0x07; - tm.tm_mday = ((rtcbuf[4] & 0x30) >> 4) * 10 + (rtcbuf[4] & 0x0f); - tm.tm_mon = ((rtcbuf[5] & 0x10) >> 4) * 10 + (rtcbuf[5] & 0x0f) - 1; - tm.tm_year = ((rtcbuf[6] & 0xf0) >> 4) * 10 + (rtcbuf[6] & 0x0f) + 100; + tm.tm_sec = ((rtcbuf[0] & 0x70) >> 4) * 10 + (rtcbuf[0] & 0x0f); + tm.tm_min = ((rtcbuf[1] & 0x70) >> 4) * 10 + (rtcbuf[1] & 0x0f); + tm.tm_hour = ((rtcbuf[2] & 0x30) >> 4) * 10 + (rtcbuf[2] & 0x0f); + tm.tm_wday = rtcbuf[3] & 0x07; + tm.tm_mday = ((rtcbuf[4] & 0x30) >> 4) * 10 + (rtcbuf[4] & 0x0f); + tm.tm_mon = ((rtcbuf[5] & 0x10) >> 4) * 10 + (rtcbuf[5] & 0x0f) - 1; + tm.tm_year = ((rtcbuf[6] & 0xf0) >> 4) * 10 + (rtcbuf[6] & 0x0f) + 100; - tm.tm_yday = 0; /* Not implemented for now */ - tm.tm_isdst = -1; /* Not implemented for now */ + tm.tm_yday = 0; /* Not implemented for now */ + tm.tm_isdst = -1; /* Not implemented for now */ + } #else tm.tm_sec = 0; tm.tm_min = 0; -- cgit v1.2.3