STM32 Internal Flash Write/Read Failure

Hello everyone!

I'm writing a STM32F446RE-based flight computer for a rocket. I want to use internal flash memory to keep some key data like base pressure or flight time. So if a power failure happens, the system can keep the base data.

These are the two main functions that I use:

 void writeInternalFlash()
 {
 	uint32_t Flash_Address = 0x08060000;
 
 	HAL_FLASH_Unlock();
 	FLASH_Erase_Sector(FLASH_SECTOR_7,VOLTAGE_RANGE_3);
 
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_BYTE,Flash_Address,systemStartCount); // These values are uint8_t
 	HAL_Delay(1);
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_BYTE,(Flash_Address+4),systemState);
 	HAL_Delay(1);
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,(Flash_Address+8),(uint32_t)previousFlightTime); // These values are float
 	HAL_Delay(1);
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,(Flash_Address+12),(uint32_t)basePressure);
 	HAL_Delay(1);
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,(Flash_Address+16),(uint32_t)offsetax);
 	HAL_Delay(1);
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,(Flash_Address+20),(uint32_t)offsetay);
 	HAL_Delay(1);
 	HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,(Flash_Address+24),(uint32_t)offsetaz);
 
 	HAL_FLASH_Lock();
 }
 
 
 void readInternalFlash()
 {
 
 	uint32_t Flash_Address = 0x08060000;
 
 	systemStartCount = *(uint8_t*) (Flash_Address);
 
 	if (systemStartCount >= 1) {
 
 		systemState = *(uint8_t*) (Flash_Address+4);
 	previousFlightTime = *(uint32_t*) (Flash_Address+8);
 		basePressure = *(uint32_t*) (Flash_Address+12);
 		offsetax = *(uint32_t*) (Flash_Address+16);
 		offsetay = *(uint32_t*) (Flash_Address+20);
 		offsetaz = *(uint32_t*) (Flash_Address+24);
 	}
 }

These are the steps that I follow, basically:

1-) I check the *systemStartCount* when the system is started. Doing this with the flash read function.

2-) If the system is never started before; I measure the base pressure, accelerometer offsets, etc. And systemStartCount++;

3-) But if the *systemStartCount* is greater than one, I take the data from flash.

4-) When it comes to the while loop, I measure the sensor data, check some algorithm things, and write the data to SD and internal flash.

The errors that I come across:

* It really doesn't work quite well, like sometimes it keeps the data and sometimes not. 

* I encountered a lot of debugging failures on CubeIDE. Target not found, flash error, etc.

* It's slowing the while loop. Loop have about 100ms interval but when I add the read flash thing it becomes about 1 second.

And also I have a timer interrupt to get flightTime data. This one can affect the flash?

What can be the wrong thing that I do?

Thanks!