OTA: STM32H7 add partition constexpr

Author: pennam

src/ota/implementation/OTASTM32H7.cpp

@@ -85,7 +85,7 @@ OTACloudProcessInterface::State STM32H7OTACloudProcess::flashOTA() {
   // this sets the registries in RTC to load the firmware from the storage selected at the next reboot
   STM32H747::writeBackupRegister(RTCBackup::DR0, 0x07AA);
   STM32H747::writeBackupRegister(RTCBackup::DR1, STM32H747OTA::STORAGE_TYPE);
-  STM32H747::writeBackupRegister(RTCBackup::DR2, data_offset);
+  STM32H747::writeBackupRegister(RTCBackup::DR2, STM32H747OTA::PARTITION);
   STM32H747::writeBackupRegister(RTCBackup::DR3, _program_length);
 
   return Reboot;
@@ -153,7 +153,7 @@ bool STM32H7OTACloudProcess::storageInit() {
     }
   }
 
-  _bd = new mbed::MBRBlockDevice(_bd_raw_qspi, data_offset);
+  _bd = new mbed::MBRBlockDevice(_bd_raw_qspi, STM32H747OTA::PARTITION);
   _fs = new mbed::FATFileSystem("fs");
   err_mount = _fs->mount(_bd);
 

src/ota/implementation/OTASTM32H7.h

@@ -24,6 +24,8 @@
 namespace STM32H747OTA {
   /* External QSPI flash + MBR + FatFs */
   static const uint32_t constexpr STORAGE_TYPE = ((1 << 2) | (1 << 5) | (1 << 7));
+  /* Default OTA partition */
+  static const uint32_t constexpr PARTITION = 2;
 }
 
 class STM32H7OTACloudProcess: public OTADefaultCloudProcessInterface {
@@ -67,7 +69,5 @@ class STM32H7OTACloudProcess: public OTADefaultCloudProcessInterface {
   mbed::BlockDevice* _bd;
   mbed::FATFileSystem* _fs;
 
-  const uint32_t data_offset=2;
-
   static const char UPDATE_FILE_NAME[];
 };