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/*
* Copyright 2010, Freie Universitaet Berlin (FUB).
* Copyright 2013, INRIA.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup driver_periph_rtc
* @file
* @brief CC430 real time clock implementation
* @author Oliver Hahm <oliver.hahm@inria.fr>
*/
#include <string.h>
#include <legacymsp430.h>
#include "irq.h"
#include "cpu.h"
#include "cc430-rtc.h"
/* Alarm callback */
static rtc_alarm_cb_t _cb;
/* Argument to alarm callback */
static void *_cb_arg;
static struct tm time_to_set;
static int set_time = 0;
kernel_pid_t rtc_second_pid = KERNEL_PID_UNDEF;
void rtc_init(void)
{
/* Set to calendar mode */
RTCCTL1 |= RTCMODE_H;
}
void rtc_poweron(void)
{
/* Set RTC operational */
RTCCTL1 &= ~RTCHOLD_H;
}
void rtc_poweroff(void)
{
/* Stop RTC */
RTCCTL1 |= RTCHOLD_H;
}
int rtc_set_time(struct tm *localt)
{
if (localt == NULL) {
return -1;
}
/* copy time to be set */
memcpy(&time_to_set, localt, sizeof(struct tm));
set_time = 1;
return 0;
}
/*---------------------------------------------------------------------------
time_t rtc_time(void) {
time_t sec;
struct tm t;
rtc_get_localtime(&t);
sec = mktime(&t);
return sec;
}
*/
int rtc_get_time(struct tm *localt)
{
uint8_t success = 0;
uint8_t i;
uint16_t tmpyear;
if (localt == NULL) {
return -1;
}
while (!success) {
for (i = 0; i < 8; i++) {
/* try again when RTC is in transition */
if (!(RTCCTL1 & RTCRDY_H)) {
break;
}
switch(i) {
case 0:
localt->tm_sec = RTCSEC;
break;
case 1:
localt->tm_min = RTCMIN;
break;
case 2:
localt->tm_hour = RTCHOUR;
break;
case 3:
localt->tm_mday = RTCDAY;
break;
case 4:
localt->tm_wday = RTCDOW;
break;
case 5:
localt->tm_mon = RTCMON - 1;
break;
case 6:
tmpyear = RTCYEARL;
tmpyear |= (RTCYEARH << 0x08);
localt->tm_year = tmpyear - 1900;
break;
default:
success = 1;
break;
}
}
}
return 0;
}
int rtc_set_alarm(struct tm *localt, rtc_alarm_cb_t cb, void *arg)
{
if (localt != NULL) {
RTCAMIN = localt->tm_min;
RTCAMIN |= BIT7;
RTCAHOUR = localt->tm_hour;
RTCAHOUR |= BIT7;
RTCADOW = localt->tm_wday;
RTCADOW |= BIT7;
RTCADAY = localt->tm_mday;
RTCADAY |= BIT7;
RTCCTL0 |= RTCAIE;
return 0;
}
else if (cb == NULL) {
return -1;
}
return -2;
}
int rtc_get_alarm(struct tm *localt)
{
if (localt != NULL) {
localt->tm_sec = -1;
localt->tm_min = RTCAMIN;
localt->tm_hour = RTCAHOUR;
localt->tm_mday = -1;
localt->tm_wday = RTCADOW;
localt->tm_yday = -1;
localt->tm_mon = - 1;
localt->tm_year = -1;
localt->tm_isdst = -1; /* not available */
return 0;
}
return -1;
}
void rtc_clear_alarm(void)
{
/* reset all AE bits */
RTCAHOUR &= ~BIT7;
RTCAMIN &= ~BIT7;
RTCADAY &= ~BIT7;
RTCADOW &= ~BIT7;
/* reset alarm interrupt enable */
RTCCTL0 &= ~RTCAIE;
}
interrupt(RTC_VECTOR) __attribute__((naked)) rtc_isr(void)
{
__enter_isr();
/* RTC is save to write for up to one second now */
if (RTCIV == RTC_RTCRDYIFG) {
/* disable interrupt */
//RTCCTL0 &= ~RTCRDYIE;
if (set_time) {
set_time = 0;
/* set previous set time and reset it */
RTCSEC = time_to_set.tm_sec;
RTCMIN = time_to_set.tm_min;
RTCHOUR = time_to_set.tm_hour;
RTCDAY = time_to_set.tm_mday;
RTCDOW = time_to_set.tm_wday;
RTCMON = time_to_set.tm_mon + 1;
RTCYEARL = (time_to_set.tm_year + 1900) & 0xFF;
RTCYEARH = (time_to_set.tm_year + 1900) >> 0x08;
}
if (rtc_second_pid != KERNEL_PID_UNDEF) {
static msg_t m;
m.type = RTCSEC;
msg_send_int(&m, rtc_second_pid);
}
}
/* RTC alarm */
else if (RTCIV == RTC_RTCAIFG) {
if (_cb) {
_cb(_cb_arg);
}
}
__exit_isr();
}
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