Linking Problem

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Stephen

• November 02, 2019 10:08

Hello

I have a basic crossworks program with 3 include lines

#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"

These files reside in the same directory as the main.c file

The build process fails at the linking stage

Linking Blue-Pill.elf
Blue-Pill THUMB Debug/main.o: in function `main':
undefined reference to `GPIO_ResetBits'
Build failed

GPIO_ResetBits exists within stm32f10x_gpio.h

I have added

BUILD_ALL and gcc to the project Preprocessor Definitions, however the build process is still failing

 

Suggestions would be appreciated

Thank you

 

 

0

• 

  Dr Danish Ali

  • January 06, 2020 19:51

  The header file gpio.h describes functions that you call from your main.c source code file. These show the compiler _how_ to call those functions (it "declares" those functions including GPIO_ResetBits() ). But it does not tell the compiler what the functions actually do.

  The functions are actually "defined" in another file stm32f10x_gpio.c which you need to tell Crossworks to compile and link in.So you could put a copy of stm32f10x_gpio.c into the directory that has main.c. And then from the project explorer in Crossworks right-click on your project or the "Source Files" folder and do "Add existing file..." and select stm32f10x_gpio.c

  Then next time you build the necessary functions will be compiled and linked in. You might also need to do the same for stm32f10x_rcc.c.

  Hope this helps,

  Danish

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