Keil中配置GCC编译器开发STM32

一、下载编译链：
https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads
在此我下载的是：gcc-arm-none-eabi-10.3-2021.10-win32.zip

二、安装GCC编译链
直接解压到D盘：

三、配置Keil工程选项：
1、选择使用GCC进行编译

2、配置编译选项
1）配置CC的编译规则

2）Assembler规则

3）Linker选项

四、STM32F103RCTX_FLASH.ld文件(基于STM32F103RCTX系列，其他系列只需要简单修改即可)

/* Entry Point */
ENTRY(Reset_Handler)/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM);  /* end of "RAM" Ram type memory */_Min_Heap_Size = 0x200 ;   /* required amount of heap  */
_Min_Stack_Size = 0x400 ;  /* required amount of stack *//* Memories definition */
MEMORY
{RAM    (xrw)    : ORIGIN = 0x20000000,   LENGTH = 48KFLASH    (rx)    : ORIGIN = 0x08000000,   LENGTH = 256K
}
/* Sections */
SECTIONS
{/* The startup code into "FLASH" Rom type memory */.isr_vector :{. = ALIGN(4);KEEP(*(.isr_vector)) /* Startup code */. = ALIGN(4);} >FLASH/* The program code and other data into "FLASH" Rom type memory */.text :{. = ALIGN(4);*(.text)           /* .text sections (code) */*(.text*)          /* .text* sections (code) */*(.glue_7)         /* glue arm to thumb code */*(.glue_7t)        /* glue thumb to arm code */*(.eh_frame)KEEP (*(.init))KEEP (*(.fini)). = ALIGN(4);_etext = .;        /* define a global symbols at end of code */} >FLASH/* Constant data into "FLASH" Rom type memory */.rodata :{. = ALIGN(4);*(.rodata)         /* .rodata sections (constants, strings, etc.) */*(.rodata*)        /* .rodata* sections (constants, strings, etc.) */. = ALIGN(4);} >FLASH.ARM.extab   : { . = ALIGN(4);*(.ARM.extab* .gnu.linkonce.armextab.*). = ALIGN(4);} >FLASH.ARM : {. = ALIGN(4);__exidx_start = .;*(.ARM.exidx*)__exidx_end = .;. = ALIGN(4);} >FLASH.preinit_array     :{. = ALIGN(4);PROVIDE_HIDDEN (__preinit_array_start = .);KEEP (*(.preinit_array*))PROVIDE_HIDDEN (__preinit_array_end = .);. = ALIGN(4);} >FLASH.init_array :{. = ALIGN(4);PROVIDE_HIDDEN (__init_array_start = .);KEEP (*(SORT(.init_array.*)))KEEP (*(.init_array*))PROVIDE_HIDDEN (__init_array_end = .);. = ALIGN(4);} >FLASH.fini_array :{. = ALIGN(4);PROVIDE_HIDDEN (__fini_array_start = .);KEEP (*(SORT(.fini_array.*)))KEEP (*(.fini_array*))PROVIDE_HIDDEN (__fini_array_end = .);. = ALIGN(4);} >FLASH/* Used by the startup to initialize data */_sidata = LOADADDR(.data);/* Initialized data sections into "RAM" Ram type memory */.data : {. = ALIGN(4);_sdata = .;        /* create a global symbol at data start */*(.data)           /* .data sections */*(.data*)          /* .data* sections */. = ALIGN(4);_edata = .;        /* define a global symbol at data end */} >RAM AT> FLASH/* Uninitialized data section into "RAM" Ram type memory */. = ALIGN(4);.bss :{/* This is used by the startup in order to initialize the .bss section */_sbss = .;         /* define a global symbol at bss start */__bss_start__ = _sbss;*(.bss)*(.bss*)*(COMMON). = ALIGN(4);_ebss = .;         /* define a global symbol at bss end */__bss_end__ = _ebss;} >RAM/* User_heap_stack section, used to check that there is enough "RAM" Ram  type memory left */._user_heap_stack :{. = ALIGN(8);PROVIDE ( end = . );PROVIDE ( _end = . );. = . + _Min_Heap_Size;. = . + _Min_Stack_Size;. = ALIGN(8);} >RAM/* Remove information from the compiler libraries *//DISCARD/ :{libc.a ( * )libm.a ( * )libgcc.a ( * )}.ARM.attributes 0 : { *(.ARM.attributes) }
}

五、启动(代码)文件修改

六、编译运行

1、strexb/strexh错误

解决方法：需要修改core_cm3.c文件里面的内容

/*** @brief  STR Exclusive (8 bit)** @param  value  value to store* @param  *addr  address pointer* @return        successful / failed** Exclusive STR command for 8 bit values*/
uint32_t __STREXB(uint8_t value, uint8_t *addr)
{uint32_t result=0;//   __ASM volatile ("strexb %0, %2, [%1]" : "=r" (result) : "r" (addr), "r" (value) );__ASM volatile ("strexb %0, %2, [%1]" : "=&r" (result) : "r" (addr), "r" (value) );return(result);
}/*** @brief  STR Exclusive (16 bit)** @param  value  value to store* @param  *addr  address pointer* @return        successful / failed** Exclusive STR command for 16 bit values*/
uint32_t __STREXH(uint16_t value, uint16_t *addr)
{uint32_t result=0;//   __ASM volatile ("strexh %0, %2, [%1]" : "=r" (result) : "r" (addr), "r" (value) );__ASM volatile ("strexh %0, %2, [%1]" : "=&r" (result) : "r" (addr), "r" (value) );return(result);
}

3、sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk’ 错误
这是因为工程使用了sprintf/printf等C库函数，没有导入标准的C库函数导致的
需要导入syscall.c文件

Syscall.c文件内容：

/**
*****************************************************************************
**
**  File        : syscalls.c
**
**  Abstract    : System Workbench Minimal System calls file
**
**                For more information about which c-functions
**                need which of these lowlevel functions
**                please consult the Newlib libc-manual
**
**  Environment : System Workbench for MCU
**
**  Distribution: The file is distributed “as is,” without any warranty
**                of any kind.
**
**  (c)Copyright System Workbench for MCU.
**  You may use this file as-is or modify it according to the needs of your
**  project. Distribution of this file (unmodified or modified) is not
**  permitted. System Workbench for MCU permit registered System Workbench(R) users the
**  rights to distribute the assembled, compiled & linked contents of this
**  file as part of an application binary file, provided that it is built
**  using the System Workbench for MCU toolchain.
**
*****************************************************************************
*//* Includes */
#include <sys/stat.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/times.h>/* Variables */
//#undef errno
extern int errno;
extern int __io_putchar(int ch) __attribute__((weak));
extern int __io_getchar(void) __attribute__((weak));register char * stack_ptr asm("sp");char *__env[1] = { 0 };
char **environ = __env;/* Functions */
void initialise_monitor_handles()
{}int _getpid(void)
{return 1;
}int _kill(int pid, int sig)
{errno = EINVAL;return -1;
}void _exit (int status)
{_kill(status, -1);while (1) {}     /* Make sure we hang here */
}int _read (int file, char *ptr, int len)
{int DataIdx;for (DataIdx = 0; DataIdx < len; DataIdx++){*ptr++ = __io_getchar();}return len;
}int _write(int file, char *ptr, int len)
{int DataIdx;for (DataIdx = 0; DataIdx < len; DataIdx++){__io_putchar(*ptr++);}return len;
}caddr_t _sbrk(int incr)
{extern char end asm("end");static char *heap_end;char *prev_heap_end;if (heap_end == 0)heap_end = &end;prev_heap_end = heap_end;if (heap_end + incr > stack_ptr){//      write(1, "Heap and stack collision\n", 25);
//      abort();errno = ENOMEM;return (caddr_t) -1;}heap_end += incr;return (caddr_t) prev_heap_end;
}int _close(int file)
{return -1;
}int _fstat(int file, struct stat *st)
{st->st_mode = S_IFCHR;return 0;
}int _isatty(int file)
{return 1;
}int _lseek(int file, int ptr, int dir)
{return 0;
}int _open(char *path, int flags, ...)
{/* Pretend like we always fail */return -1;
}int _wait(int *status)
{errno = ECHILD;return -1;
}int _unlink(char *name)
{errno = ENOENT;return -1;
}int _times(struct tms *buf)
{return -1;
}int _stat(char *file, struct stat *st)
{st->st_mode = S_IFCHR;return 0;
}int _link(char *old, char *new)
{errno = EMLINK;return -1;
}int _fork(void)
{errno = EAGAIN;return -1;
}int _execve(char *name, char **argv, char **env)
{errno = ENOMEM;return -1;
}

到此编译后没有出现错误了！

七、编译成功后生成的是.elf和.hex文件，如果需要生成.bin文件，可以在User里面添加一个bat执行文件

Bat文件内容为：

D:\gcc-arm-none-eabi-10.3-2021.10-win32\gcc-arm-none-eabi-10.3-2021.10\arm-none-eabi\bin\objcopy.exe -O binary AppPrj.elf  AppPrj_debug.bin

备注：
此工程配置后虽然能够正常运行程序，但在我电脑无法进行正常debug，很困惑。

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