feat(h7): RTC backup RAM (#6171)

radio/src/storage/rtc_backup.cpp

@@ -40,6 +40,11 @@ Backup::RamBackupUncompressed ramBackupUncompressed __DMA;
 RamBackup _ramBackup;
 RamBackup * ramBackup = &_ramBackup;
 #else
+
+#if !defined(BKPSRAM_BASE) && defined(D3_BKPSRAM_BASE)
+  #define BKPSRAM_BASE D3_BKPSRAM_BASE
+#endif
+
 RamBackup * ramBackup = (RamBackup *)BKPSRAM_BASE;
 #endif
 

radio/src/targets/common/arm/stm32/rtc_driver.cpp

@@ -106,7 +106,9 @@ void rtcInit()
 #endif
 
 #if defined(RTC_BACKUP_RAM) && !defined(BOOT)
+#if defined(STM32F4)
   __HAL_RCC_BKPSRAM_CLK_ENABLE();
+#endif
   HAL_PWREx_EnableBkUpReg();
   HAL_PWR_EnableBkUpAccess();
 #endif
@@ -115,7 +117,9 @@ void rtcInit()
 void rtcDisableBackupReg()
 {
 #if defined(RTC_BACKUP_RAM)
+#if defined(STM32F4)
   __HAL_RCC_BKPSRAM_CLK_DISABLE();
+#endif
   HAL_PWREx_DisableBkUpReg();
   HAL_PWR_DisableBkUpAccess();
 #endif

radio/src/targets/st16/CMakeLists.txt

@@ -19,7 +19,7 @@ set(HAPTIC YES)
 set(GUI_DIR colorlcd)
 set(BITMAPS_DIR 480x272)
 set(TARGET_DIR st16)
-# set(RTC_BACKUP_RAM YES)
+set(RTC_BACKUP_RAM YES)
 set(PPM_LIMITS_SYMETRICAL YES)
 set(USB_SERIAL ON CACHE BOOL "Enable USB serial (CDC)")
 set(HARDWARE_EXTERNAL_MODULE YES)