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[API] Added option to modify RTC source 

Initially from Karls question here:
http://developer.mbed.org/questions/6337/setTime-and-time-exported-with-__weak-fo/#answer6545?compage=1#c15936.
Currently the C time functions only work with internal RTC. Sometimes
you either want to use an external one, or your target does not even
have an internal RTC. I added function attach_rtc(...) where the default
functions can be overridden at runtime.
pull/926/head
Sissors 2015-02-22 13:19:02 +01:00
parent ac0504da13
commit f0d04f5360
2 changed files with 47 additions and 12 deletions
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9
libraries/mbed/api/rtc_time.h
View File

@ -69,6 +69,15 @@ extern "C" {
*/
void set_time(time_t t);
/** Attach an external RTC to be used for the C time functions
*
* @param read_rtc pointer to function which returns current UNIX timestamp
* @param write_rtc pointer to function which sets current UNIX timestamp, can be NULL
* @param init_rtc pointer to funtion which initializes RTC, can be NULL
* @param isenabled_rtc pointer to function wich returns if the rtc is enabled, can be NULL
*/
void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void));
#ifdef __cplusplus
}
#endif

50
libraries/mbed/common/rtc_time.c
View File

@ -19,6 +19,18 @@
#include "rtc_time.h"
#include "us_ticker_api.h"
#if DEVICE_RTC
static void (*_rtc_init)(void) = rtc_init;
static int (*_rtc_isenabled)(void) = rtc_isenabled;
static time_t (*_rtc_read)(void) = rtc_read;
static void (*_rtc_write)(time_t t) = rtc_write;
#else
static void (*_rtc_init)(void) = NULL;
static int (*_rtc_isenabled)(void) = NULL;
static time_t (*_rtc_read)(void) = NULL;
static void (*_rtc_write)(time_t t) = NULL;
#endif
#ifdef __cplusplus
extern "C" {
#endif
@ -29,15 +41,18 @@ time_t time(time_t *timer)
#endif
{
#if DEVICE_RTC
if (!(rtc_isenabled())) {
set_time(0);
if (_rtc_isenabled != NULL) {
if (!(_rtc_isenabled())) {
set_time(0);
}
}
time_t t;
if (_rtc_read != NULL) {
t = _rtc_read();
} else {
t = 0;
}
time_t t = rtc_read();
#else
time_t t = 0;
#endif
if (timer != NULL) {
*timer = t;
@ -46,10 +61,12 @@ time_t time(time_t *timer)
}
void set_time(time_t t) {
#if DEVICE_RTC
rtc_init();
rtc_write(t);
#endif
if (_rtc_init != NULL) {
_rtc_init();
}
if (_rtc_write != NULL) {
_rtc_write(t);
}
}
clock_t clock() {
@ -58,6 +75,15 @@ clock_t clock() {
return t;
}
void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void)) {
_rtc_read = read_rtc;
_rtc_write = write_rtc;
_rtc_init = init_rtc;
_rtc_isenabled = isenabled_rtc;
}
#ifdef __cplusplus
}
#endif