Simple analysis of STM32 startup file-EEWORLD

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Simple analysis of STM32 startup file (applicable scope of STM32F10x.s) Timer, model, name in <>, all our routines use a startup file called STM32F10x.s, which defines the stack size of STM32 and the names of various interrupts and entry function names, as well as startup-related assembly code. STM32F10x.s is the startup code provided by MDK. From the content inside, it only defines 3 serial ports and 4 timers. In fact, the STM32 series products have models with 5 serial ports, and only models with 2 serial ports, and timers as well, with a maximum of 8 timers. For example, if you use STM32F103ZET6, and the startup file uses STM32F10x.s, you can use the interrupts of serial ports 1~3 normally, while the interrupts of serial ports 4 and 5 are not used normally. For example, the interrupts of TIM1~4 can be used normally, but those of 5~8 cannot be used.

Therefore, STM32F10x.s cannot be applied to all STM32 models. In this way, we have to choose different startup files for different STM32 models. ST provides us with 3 startup files, which are suitable for STM32 chips of different capacities. They are:

startup_stm32f10x_ld.s

startup_stm32f10x_md.s

startup_stm32f10x_hd.s

Among them, ld.s is suitable for small capacity products; md.s is suitable for medium capacity products; hd is suitable for large capacity products;

The capacity here refers to the size of FLASH. The judgment method is as follows:

Small capacity: FLASH≤32K

Medium capacity: 64K≤FLASH≤128K

Large capacity: 256K≤FLASH

Our development board uses STM32F103RBT6, which has a FLASH capacity of 128K and is a medium-capacity product. STM32F10x.s is just the startup file that meets the requirements of medium-capacity models, so there will be no problem using STM32F10x.s, which is equivalent to startup_stm32f10x_md.s. If yours is a small-capacity or large-capacity STM32, you can choose startup_stm32f10x_ld.s or startup_stm32f10x_hd.s accordingly.

Upload these startup files here. See the attachment for details.

cl: interconnect products, stm32f105/107 series

vl: value-for-money products, stm32f100 series

xl: ultra-high density products, stm32f101/103 series ultra-large capacity 512-1024K

ld: low-density product, FLASH is less than 64K

md: medium density product, FLASH=64 or 128

hd: high density product, FLASH greater than 128-512

Keywords：STM32 Reference address：Simple analysis of STM32 startup file

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