From c145bd903fe61e5593c164bd14782a71fc65e632 Mon Sep 17 00:00:00 2001
From: barthess <barthess@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Thu, 30 Oct 2014 19:31:21 +0000
Subject: RTC. Implemented  function rtcConvertDateTimeToFAT()

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7436 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/include/rtc.h |  2 +-
 os/hal/src/rtc.c     | 20 +++++++++++++++++---
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/os/hal/include/rtc.h b/os/hal/include/rtc.h
index 91a3d71e5..8e94bc08f 100644
--- a/os/hal/include/rtc.h
+++ b/os/hal/include/rtc.h
@@ -124,7 +124,7 @@ extern "C" {
 #if RTC_SUPPORTS_CALLBACKS
   void rtcSetCallback(RTCDriver *rtcp, rtccb_t callback);
 #endif
-  uint32_t rtcConvertDateTimeToFAT(RTCDateTime *timespec);
+  uint32_t rtcConvertDateTimeToFAT(const RTCDateTime *timespec);
 #ifdef __cplusplus
 }
 #endif
diff --git a/os/hal/src/rtc.c b/os/hal/src/rtc.c
index d3799a011..4b57614a1 100644
--- a/os/hal/src/rtc.c
+++ b/os/hal/src/rtc.c
@@ -193,12 +193,26 @@ void rtcSetCallback(RTCDriver *rtcp, rtccb_t callback) {
  *
  * @api
  */
-uint32_t rtcConvertDateTimeToFAT(RTCDateTime *timespec) {
+uint32_t rtcConvertDateTimeToFAT(const RTCDateTime *timespec) {
+
+  uint32_t fattime;
+  uint32_t sec, min, hour, tmp;
 
   osalDbgCheck(timespec != NULL);
 
-  /* TODO: Implement.*/
-  return 0;
+  tmp = timespec->millisecond / 1000;
+  sec = tmp % 60;
+  min = (tmp - sec) % 3600;
+  hour = (tmp - sec - min * 60) / 3600;
+
+  fattime  = sec              >> 1;
+  fattime |= min              << 5;
+  fattime |= hour             << 11;
+  fattime |= timespec->day    << 16;
+  fattime |= timespec->month  << 21;
+  fattime |= timespec->year   << 25;
+
+  return fattime;
 }
 
 #endif /* HAL_USE_RTC */
-- 
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