View the current flash usage through the map file in STM32.

Apr 6, 2023#STM32338

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The STM32 microcontroller uses a map file to view the current usage of flash memory. The map file can be found in the Listings folder. By running a program and checking the map file, it is possible to see how much space the program occupies in flash memory. The space is divided into loaded space (CODE + RO + RW-data) and execution space (CODE + RO). The loaded space is smaller because the initialized data is moved from flash to RAM upon power-up. Based on the loaded space, the program occupies 12268B, which is less than 12KB. The STM32F103RCT6 microcontroller has a 256KB flash memory, and only the first 6 pages are used for the program, leaving the remaining pages for other purposes.

View current flash usage using map file in STM32#

The map file is located in the Listings folder.

Run the program before adding flash read and write operations, and check the amount of flash space occupied by the program through the .map file.

Load space: CODE + RO (const variables or string constants) + RW-data initialized data
Execution space: CODE + RO
After power-on, the RW-data initialized data is moved from flash to RAM, so the execution space will be slightly smaller.

Based on the load space, Size: 0x00002fec = 12268B < 12KB. According to the "STM32F10xxx Flash Programming Reference Manual", it is known that the flash of F103RCT6 is 256KB, which belongs to a large capacity product. The page size of its flash is 2K, so only the first 6 pages, page 0 to page 5, can be used to store the program. The remaining part, page 6 to page 127, can be used for other purposes.