From 9f7d75bbc0826718d536e134cbe868830dfd0aa1 Mon Sep 17 00:00:00 2001
From: Nathael Pajani <nathael.pajani@ed3l.fr>
Date: Thu, 11 Apr 2019 15:51:18 +0200
Subject: [PATCH] Add rtc_pcf85363_daytime_to_seconds and
 rtc_pcf85363_seconds_to_daytime

---
 extdrv/rtc_pcf85363a.c         | 32 ++++++++++++++++++++++++++++++++
 include/extdrv/rtc_pcf85363a.h | 23 ++++++++++-------------
 2 files changed, 42 insertions(+), 13 deletions(-)

diff --git a/extdrv/rtc_pcf85363a.c b/extdrv/rtc_pcf85363a.c
index 47d99a1..f95ffdf 100644
--- a/extdrv/rtc_pcf85363a.c
+++ b/extdrv/rtc_pcf85363a.c
@@ -297,6 +297,38 @@ int rtc_pcf85363_time_to_str(struct rtc_time* time, char* str, int size)
 	return len;
 }
 
+/* Return the number of seconds of the curent day */
+uint32_t rtc_pcf85363_daytime_to_seconds(struct rtc_time* time)
+{
+	uint32_t seconds = ((time->sec & 0x0F) + ((time->sec & 0xF0) >> 4) * 10);
+	seconds += ((time->min & 0x0F) + ((time->min & 0xF0) >> 4) * 10) * 60;
+	seconds += ((time->hour & 0x0F) + ((time->hour & 0xF0) >> 4) * 10) * 3600;
+	return seconds;
+}
+
+/* Update the hours, minutes and seconds fields of the given time according to the number
+ * of seconds given in second argument.
+ * LPC1224 uses a Cortex M0, which has no modulo or division instruction, so this solution
+ * limits the calls to the ROM division routines to 5.
+ */
+void rtc_pcf85363_seconds_to_daytime(struct rtc_time* time, uint32_t seconds)
+{
+	uint32_t sec_tmp, min_tmp, hour_tmp;
+	hour_tmp = seconds / 3600;
+	seconds -= 3600 * hour_tmp;
+	min_tmp = seconds / 60;
+	sec_tmp = seconds - 60 * min_tmp;
+
+	time->hour = (hour_tmp / 10) << 4;
+	time->hour += (hour_tmp - (time->hour >> 4) * 10);
+
+	time->min = (min_tmp / 10) << 4;
+	time->min += (min_tmp - (time->min >> 4) * 10);
+
+	time->sec = (sec_tmp / 10) << 4;
+	time->sec += (sec_tmp - (time->sec >> 4) * 10);
+}
+
 /* Compare two times
  * Return 0 if they are equal, 1 if t1 > t2, and -1 if t1 < t2
  */
diff --git a/include/extdrv/rtc_pcf85363a.h b/include/extdrv/rtc_pcf85363a.h
index bb57643..0d492fc 100644
--- a/include/extdrv/rtc_pcf85363a.h
+++ b/include/extdrv/rtc_pcf85363a.h
@@ -143,25 +143,15 @@ struct rtc_pcf85363a_config {
 };
 
 
-/* Time Read
- * When performing a time read operation, all time registers have to be read at once as
- *  a copy of the internal values is made by the device to a temporary buffer at the
- *  beginning of the read for data coherency.
- */
+/* Time Read from RTC */
 int rtc_pcf85363_time_read(struct rtc_pcf85363a_config* conf, struct rtc_time* time);
 
-/* Time Write
- * A time write operation has to be done in one go for all time registers for time data
- *  coherency.
- * Also, when performing a time write, the STOP bit must be set and the prescalers should
- *  be cleared.
- */
+/* Time Write to RTC */
 int rtc_pcf85363_time_write(struct rtc_pcf85363a_config* conf, struct rtc_time* time);
 
 
 
-/* Get one of the timestamps
- */
+/* Get one of the timestamps */
 int rtc_pcf85363_get_timestamp(struct rtc_pcf85363a_config* conf,
 									struct rtc_timestamp* tstmp, uint8_t timestamp_num);
 /* Erase timestamps */
@@ -172,6 +162,13 @@ int rtc_pcf85363_erase_timestamps(struct rtc_pcf85363a_config* conf);
 /* Print the time to a usable string, in a unix format which "date" could understand. */
 int rtc_pcf85363_time_to_str(struct rtc_time* time, char* str, int size);
 
+/* Return the number of seconds of the curent day */
+uint32_t rtc_pcf85363_daytime_to_seconds(struct rtc_time* time);
+
+/* Update the hours, minutes and seconds fields of the given time according to the number
+ * of seconds given in second argument. */
+void rtc_pcf85363_seconds_to_daytime(struct rtc_time* time, uint32_t seconds);
+
 /* Compare two times
  * Return 0 if they are equal, 1 if t1 > t2, and -1 if t1 < t2
  */
-- 
2.43.0