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Move the RTC read throttling to a smarter place

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8912 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Brandon Low 2006-03-05 18:19:46 +00:00
parent 63c0d1dd9c
commit 6668b65ef2
2 changed files with 21 additions and 23 deletions
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27
firmware/common/timefuncs.c
View file

@ -20,6 +20,7 @@
#include <stdio.h> /* get NULL */ #include <stdio.h> /* get NULL */
#include "config.h" #include "config.h"
#include "kernel.h"
#include "rtc.h" #include "rtc.h"
#include "timefuncs.h" #include "timefuncs.h"
#include "debug.h" #include "debug.h"
@ -42,25 +43,29 @@ bool valid_time(const struct tm *tm)
return true; return true;
} }
static int last_tick = 0;
struct tm *get_time(void) struct tm *get_time(void)
{ {
#ifndef SIMULATOR #ifndef SIMULATOR
#ifdef CONFIG_RTC #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_sec = ((rtcbuf[0] & 0x70) >> 4) * 10 + (rtcbuf[0] & 0x0f);
tm.tm_min = ((rtcbuf[1] & 0x70) >> 4) * 10 + (rtcbuf[1] & 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_hour = ((rtcbuf[2] & 0x30) >> 4) * 10 + (rtcbuf[2] & 0x0f);
tm.tm_wday = rtcbuf[3] & 0x07; tm.tm_wday = rtcbuf[3] & 0x07;
tm.tm_mday = ((rtcbuf[4] & 0x30) >> 4) * 10 + (rtcbuf[4] & 0x0f); 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_mon = ((rtcbuf[5] & 0x10) >> 4) * 10 + (rtcbuf[5] & 0x0f) - 1;
tm.tm_year = ((rtcbuf[6] & 0xf0) >> 4) * 10 + (rtcbuf[6] & 0x0f) + 100; tm.tm_year = ((rtcbuf[6] & 0xf0) >> 4) * 10 + (rtcbuf[6] & 0x0f) + 100;
tm.tm_yday = 0; /* Not implemented for now */ tm.tm_yday = 0; /* Not implemented for now */
tm.tm_isdst = -1; /* Not implemented for now */ tm.tm_isdst = -1; /* Not implemented for now */
}
#else #else
tm.tm_sec = 0; tm.tm_sec = 0;
tm.tm_min = 0; tm.tm_min = 0;

17
firmware/drivers/rtc.c
View file

@ -61,24 +61,17 @@ int rtc_write_datetime(unsigned char* buf)
return 1; return 1;
} }
#elif CONFIG_RTC == RTC_PCF50606 #elif CONFIG_RTC == RTC_PCF50606
static int last_tick;
static char rtc_buf[7];
void rtc_init(void) void rtc_init(void)
{ {
last_tick = 0;
} }
int rtc_read_datetime(unsigned char* buf) { int rtc_read_datetime(unsigned char* buf) {
int rc; int rc;
if (last_tick + HZ/2 < current_tick) { int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
last_tick = current_tick; rc = pcf50606_read_multiple(0x0a, buf, 7);
rc = pcf50606_read_multiple(0x0a, rtc_buf, 7);
set_irq_level(oldlevel); set_irq_level(oldlevel);
} else {
rc = 7;
}
memcpy(buf, rtc_buf, 7);
return rc; return rc;
} }