About STM32F10x.s startup file-EEWORLD

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In the <>, all our routines use a startup file called STM32F10x.s, which defines the stack size of STM32, the names of various interrupts and the names of entry functions, as well as startup-related assembly code. STM32F10x.s is the startup code provided by MDK. From its content, 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. The same is true for timers, 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, but the interrupts of serial ports 4 and 5 cannot be used normally. For another example, your 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, with a FLASH capacity of 128K, which is a medium-capacity product, and STM32F10x.s just meets the startup file for medium-capacity models, so there will be no problem using STM32F10x.s, it is equivalent to startup_stm32f10x_md.s. If you have a small-capacity or large-capacity STM32, you can choose startup_stm32f10x_ld.s or startup_stm32f10x_hd.s accordingly.

Keywords：STM32F10x.s Reference address：About STM32F10x.s startup file

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