STM32F103C8T6 (Blue Pill) Startup and Linker Script Example

This repository provides an example of a startup code and linker script for the STM32F103C8T6 (Blue Pill) microcontroller. The example includes a basic application (app.c) with a main loop, a linker script (STM32F103C8TX_FLASH.ld), and a startup code (startup_stm32f103c8tx.c).

Project Structure

app.c: Simple application demonstrating the use of startup code and linker script.
STM32F103C8TX_FLASH.ld: Linker script defining memory layout and sections.
startup_stm32f103c8tx.c: Startup code containing vector table and initialization functions.
app.map: Map file generated during the linking process.
startup_stm32f103c8tx.elf: ELF executable file.
startup_stm32f103c8tx.bin: Binary file for flashing.
startup_stm32f103c8tx.hex: Intel Hex file for flashing.

Compilation Process

To compile and build the project, follow these steps:

Compile App and Startup Code:

arm-none-eabi-gcc -c -mcpu=cortex-m3 -mthumb app.c -o app.o arm-none-eabi-gcc -c -mcpu=cortex-m3 -mthumb startup_stm32f103c8tx.c -o startup_stm32f103c8tx.o
Link Object Files:

arm-none-eabi-ld -Map app.map -T LinkerScript.ld startup_stm32f103c8tx.o app.o -o startup_stm32f103c8tx.elf
Generate Binary File:

arm-none-eabi-objcopy -O binary startup_stm32f103c8tx.elf startup_stm32f103c8tx.bin
Generate Hex File:

arm-none-eabi-objcopy -O ihex startup_stm32f103c8tx.elf startup_stm32f103c8tx.hex

Flashing and Debugging

Use your preferred method to flash the generated binary (startup_stm32f103c8tx.bin) to the STM32F103C8T6 microcontroller. You can use tools like ST-Link Utility or OpenOCD for this purpose.

Memory Layout

The linker script (LinkerScript.ld) defines the memory layout for the microcontroller:

FLASH: 64 KB (Starting at 0x08000000)
RAM: 20 KB (Starting at 0x20000000)

Checking Addresses

After flashing the firmware, you can use ST-Link Utility or similar tools to verify that the vector table and other sections are correctly located in the Flash memory.