From 1852442c5cb0b3169bd65970cb4052d02364011e Mon Sep 17 00:00:00 2001
From: Raphael Coeffic <raphaelcoeffic@users.noreply.github.com>
Date: Fri, 2 May 2025 05:17:43 +0200
Subject: [PATCH] feat(h7): RTC backup RAM (#6171)

---
 radio/src/storage/rtc_backup.cpp                  | 5 +++++
 radio/src/targets/common/arm/stm32/rtc_driver.cpp | 4 ++++
 radio/src/targets/st16/CMakeLists.txt             | 2 +-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/radio/src/storage/rtc_backup.cpp b/radio/src/storage/rtc_backup.cpp
index 1736cfaaf..990aa82c2 100644
--- a/radio/src/storage/rtc_backup.cpp
+++ b/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
 
diff --git a/radio/src/targets/common/arm/stm32/rtc_driver.cpp b/radio/src/targets/common/arm/stm32/rtc_driver.cpp
index 9aa98841a..cd07d6a88 100644
--- a/radio/src/targets/common/arm/stm32/rtc_driver.cpp
+++ b/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
diff --git a/radio/src/targets/st16/CMakeLists.txt b/radio/src/targets/st16/CMakeLists.txt
index 5ff843960..e4ddcf75a 100644
--- a/radio/src/targets/st16/CMakeLists.txt
+++ b/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)