View current flash usage with 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 program's loaded space includes code, read-only data, and initialized data, while the execution space only includes code and read-only data. The loaded space is smaller than the available flash memory, indicating that there is still space available for other purposes.

View the current flash usage using the 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 how much space the program occupies in the flash using 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," the flash of F103RCT6 is 256KB, which belongs to the high-capacity product. The page size of its flash is 2K, so only the first 6 pages, page 0 to page 5, are used to store the program. The remaining part, page 6 to page 127, can be used for other purposes.