RTC. Added enables/disables of writing access to BKP registers in all write operations.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3794 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 13 insertions, 2 deletions

diff --git a/os/hal/platforms/STM32/RTCv1/rtc_lld.c b/os/hal/platforms/STM32/RTCv1/rtc_lld.c
index f133f4970..b2474c71b 100644
--- a/os/hal/platforms/STM32/RTCv1/rtc_lld.c
+++ b/os/hal/platforms/STM32/RTCv1/rtc_lld.c
@@ -61,6 +61,7 @@ RTCDriver RTCD1;
  */

 static void rtc_lld_serve_interrupt(RTCDriver *rtcp) {

 

+  PWR->CR |= PWR_CR_DBP;

   chSysLockFromIsr();

 

   if ((RTC->CRH & RTC_CRH_SECIE) && (RTC->CRL & RTC_CRL_SECF)) {

@@ -77,6 +78,7 @@ static void rtc_lld_serve_interrupt(RTCDriver *rtcp) {
   }

 

   chSysUnlockFromIsr();

+  PWR->CR &= ~PWR_CR_DBP;

 }

 

 /**

@@ -136,10 +138,12 @@ CH_IRQ_HANDLER(RTC_IRQHandler) {
  */

 void rtc_lld_init(void){

 

+  PWR->CR |= PWR_CR_DBP;

+

   /* Ensure that RTC_CNT and RTC_DIV contain actual values after enabling

      clocking on APB1, because these values only update when APB1

      functioning.*/

-  RTC->CRL = 0;

+  RTC->CRL &= ~(RTC_CRL_OWF | RTC_CRL_ALRF | RTC_CRL_SECF);

   while (!(RTC->CRL & RTC_CRL_RSF))

     ;

 

@@ -164,6 +168,8 @@ void rtc_lld_init(void){
     rtc_lld_release();

   }

 

+  PWR->CR &= ~PWR_CR_DBP;

+

   /* Callback initially disabled.*/

   RTCD1.callback = NULL;

 }

@@ -182,12 +188,14 @@ void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
 

   (void)rtcp;

 

+  PWR->CR |= PWR_CR_DBP;

   rtc_lld_acquire();

   RTC->CRL |= RTC_CRL_CNF;

   RTC->CNTH = (uint16_t)(timespec->tv_sec >> 16);

   RTC->CNTL = (uint16_t)(timespec->tv_sec & 0xFFFF);

   RTC->CRL &= ~RTC_CRL_CNF;

   rtc_lld_release();

+  PWR->CR &= ~PWR_CR_DBP;

 }

 

 /**

@@ -232,9 +240,9 @@ void rtc_lld_set_alarm(RTCDriver *rtcp,
   (void)rtcp;

   (void)alarm;

 

-

   /* Enters configuration mode and writes ALRHx registers then leaves the

      configuration mode.*/

+  PWR->CR |= PWR_CR_DBP;

   rtc_lld_acquire();

   RTC->CRL |= RTC_CRL_CNF;

   if (alarmspec != NULL) {

@@ -247,6 +255,7 @@ void rtc_lld_set_alarm(RTCDriver *rtcp,
   }

   RTC->CRL &= ~RTC_CRL_CNF;

   rtc_lld_release();

+  PWR->CR &= ~PWR_CR_DBP;

 }

 

 /**

@@ -284,6 +293,7 @@ void rtc_lld_get_alarm(RTCDriver *rtcp,
  */

 void rtc_lld_set_callback(RTCDriver *rtcp, rtccb_t callback) {

 

+  PWR->CR |= PWR_CR_DBP;

   rtc_lld_acquire();

   if (callback != NULL) {

     rtcp->callback = callback;

@@ -301,6 +311,7 @@ void rtc_lld_set_callback(RTCDriver *rtcp, rtccb_t callback) {
     RTC->CRH &= ~(RTC_CRH_OWIE | RTC_CRH_ALRIE | RTC_CRH_SECIE);

   }

   rtc_lld_release();

+  PWR->CR &= ~PWR_CR_DBP;

 }

 

 #endif /* HAL_USE_RTC */