How to write/read to FLASH on STM32F4, Cortex M4

by

You can use following code for write data to flash with HAL library.

void Write_Flash(uint8_t data)
{
     HAL_FLASH_Unlock();
     __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGSERR );
     FLASH_Erase_Sector(FLASH_SECTOR_6, VOLTAGE_RANGE_3);
     HAL_FLASH_Program(TYPEPROGRAM_WORD, FlashAddress, data);
     HAL_FLASH_Lock();
}

You should update linker script as follows. Add DATA in MEMORY and add .user_data in SECTIONS.

MEMORY
{
RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 320K
CCMRAM (rw)      : ORIGIN = 0x10000000, LENGTH = 64K
FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 2048K
DATA (rwx)      : ORIGIN = 0x08040000, LENGTH = 128k
}

/* Define output sections */
SECTIONS
{
 .user_data :
  {
    . = ALIGN(4);
     KEEP(*(.user_data))
    . = ALIGN(4);
  } > DATA

You should add following attribute on main code for reading data after power on

__attribute__((__section__(".user_data"))) const char userConfig[64];

After all these, you can read your flash data with calling userConfig[0].

More Related Contents:

  1. which is faster assigning a number to the variable or changing the value of that variable either by adding or subtracting some number?
  2. Storing value of unsigned int variable in char array in C [closed]
  3. C program goes into infinite loop with scanf [duplicate]
  4. Simple C scanf does not work? [duplicate]
  5. Pointers in C: when to use the ampersand and the asterisk?
  6. Creating a daemon in Linux
  7. printf format specifiers for uint32_t and size_t
  8. “error: assignment to expression with array type error” when I assign a struct field (C)
  9. What causes the Broken Pipe Error?
  10. Implement generic swap macro in C [duplicate]
  11. strtok function thread safety
  12. What is the difference between a segmentation fault and a stack overflow?
  13. Is void a data type in C?
  14. Getting terminal size in c for windows?
  15. Checking the stdin buffer if it’s empty
  16. C : typedef struct name {…}; VS typedef struct{…} name;
  17. Stabilizing the standard library qsort?
  18. Given an audio stream, find when a door slams (sound pressure level calculation?)
  19. Linked list recursive reverse
  20. Enabling strict floating point mode in GCC
  21. Trouble reading a line using fscanf()
  22. size of array in c
  23. note: previous implicit declaration of ‘point_forward’ was here
  24. My floating point number has extra digits when I print it
  25. Passing a matrix in a function (C)
  26. How does the CPU cache affect the performance of a C program
  27. How do I print a #defined constant in GDB?
  28. Is there a way to use fopen_s() with GCC or at least create a #define about it?
  29. Performance: memset
  30. Equivalent to Windows getch() for Mac/Linux crashes

Leave a Comment