学习RT-Thread之路

发布于 2015-03-30 12:43:49 浏览：2069 订阅该版

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学习RTT大概有一周了，总算有点思路了。把自己的思路写下来，让各位大大看看思路是否有问题。用scons的时候碰到了一些问题，虽然说查了些资料，但是还是问题不断，故贴出来让大家帮找找错。谢谢各位大大了！
目标板子：基于cortex-M3内核设计的单片机。地址空间分配和cortex-M3官方手册不同，其他都相同。如uart、spi、dma而外设属于自己设计。总的来说，需要移植的代码包含bsp和libcpu两个文件夹下的代码。
一、libcpu文件夹下代码的修改。

1. 编译器使用Keil，故只修改RT-Thread_1.2.0libcpuarmcortex-m3context_rvds.S文件。把

```SCB_VTOR        EQU     0xE000ED08               ; Vector Table Offset Register
NVIC_INT_CTRL   EQU     0xE000ED04               ; interrupt control state register
NVIC_SYSPRI2    EQU     0xE000ED20               ; system priority register (2)
```
地址修改为自己的单片机的相对应的地址，其他代码不变。

2、修改RT-Thread_1.2.0libcpuarmcortex-m3cpuport.c文件。把```#define SCB_CFSR        (*(volatile const unsigned *)0xE000ED28) /* Configurable Fault Status Register */
#define SCB_HFSR        (*(volatile const unsigned *)0xE000ED2C) /* HardFault Status Register */
#define SCB_MMAR        (*(volatile const unsigned *)0xE000ED34) /* MemManage Fault Address register */
#define SCB_BFAR        (*(volatile const unsigned *)0xE000ED38) /* Bus Fault Address Register */

#define SCB_CFSR_MFSR   (*(volatile const unsigned char*)0xE000ED28)  /* Memory-management Fault Status Register */
#define SCB_CFSR_BFSR   (*(volatile const unsigned char*)0xE000ED29)  /* Bus Fault Status Register */
#define SCB_CFSR_UFSR   (*(volatile const unsigned short*)0xE000ED2A) /* Usage Fault Status Register */
```
地址修改为自己的单片机的相对应的地址，其他代码不变。

二、bsp文件夹下的修改。
	1. 在bsp文件夹下新建一个文件夹命名为“myboard”
	2. 在myboard文件夹下新建“applications”、“CMSIS”、“drives”三个文件夹。其中bsp目录下的rtconfig.py、Sconstruct、Sconscript内容如下。
rtconfig.py
```import os

# toolchains options
ARCH='arm'
CPU='cortex-m3'
CROSS_TOOL='keil'

if os.getenv('RTT_CC'):
	CROSS_TOOL = os.getenv('RTT_CC')

# cross_tool provides the cross compiler
# EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR

if  CROSS_TOOL == 'gcc':
	PLATFORM 	= 'gcc'
	EXEC_PATH 	= 'D:/SourceryGCC/bin'
elif CROSS_TOOL == 'keil':
	PLATFORM 	= 'armcc'
	EXEC_PATH 	= 'D:/Keil'
elif CROSS_TOOL == 'iar':
	PLATFORM 	= 'iar'
	IAR_PATH 	= 'C:/Program Files/IAR Systems/Embedded Workbench 6.0 Evaluation'

if os.getenv('RTT_EXEC_PATH'):
	EXEC_PATH = os.getenv('RTT_EXEC_PATH')

BUILD = 'debug'

if PLATFORM == 'gcc':
    # toolchains
    PREFIX = 'arm-none-eabi-'
    CC = PREFIX + 'gcc'
    AS = PREFIX + 'gcc'
    AR = PREFIX + 'ar'
    LINK = PREFIX + 'gcc'
    TARGET_EXT = 'axf'
    SIZE = PREFIX + 'size'
    OBJDUMP = PREFIX + 'objdump'
    OBJCPY = PREFIX + 'objcopy'

DEVICE = ' -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections'
    CFLAGS = DEVICE
    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp'
    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-myboard.map,-cref,-u,Reset_Handler -T myboard_rom.ld'

CPATH = ''
    LPATH = ''

if BUILD == 'debug':
        CFLAGS += ' -O0 -gdwarf-2'
        AFLAGS += ' -gdwarf-2'
    else:
        CFLAGS += ' -O2'

POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin
' + SIZE + ' $TARGET 
'

elif PLATFORM == 'armcc':
    # toolchains
    CC = 'armcc'
    AS = 'armasm'
    AR = 'armar'
    LINK = 'armlink'
    TARGET_EXT = 'axf'

DEVICE = ' --device DARMSTM'
    CFLAGS = DEVICE + ' --apcs=interwork'
    AFLAGS = DEVICE
    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rtthread-myboard.map --scatter myboard_rom.sct'

CFLAGS += ' -I' + EXEC_PATH + '/ARM/RV31/INC'
    LFLAGS += ' --libpath ' + EXEC_PATH + '/ARM/RV31/LIB'

EXEC_PATH += '/arm/bin40/'

if BUILD == 'debug':
        CFLAGS += ' -g -O0'
        AFLAGS += ' -g'
    else:
        CFLAGS += ' -O2'

POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin 
fromelf -z $TARGET'

elif PLATFORM == 'iar':
    # toolchains
    CC = 'iccarm'
    AS = 'iasmarm'
    AR = 'iarchive'
    LINK = 'ilinkarm'
    TARGET_EXT = 'out'

DEVICE = ' -D USE_STDPERIPH_DRIVER' + ' -D STM32F10X_HD'

CFLAGS = DEVICE
    CFLAGS += ' --diag_suppress Pa050'
    CFLAGS += ' --no_cse' 
    CFLAGS += ' --no_unroll' 
    CFLAGS += ' --no_inline' 
    CFLAGS += ' --no_code_motion' 
    CFLAGS += ' --no_tbaa' 
    CFLAGS += ' --no_clustering' 
    CFLAGS += ' --no_scheduling' 
    CFLAGS += ' --debug' 
    CFLAGS += ' --endian=little' 
    CFLAGS += ' --cpu=Cortex-M3' 
    CFLAGS += ' -e' 
    CFLAGS += ' --fpu=None'
    CFLAGS += ' --dlib_config "' + IAR_PATH + '/arm/INC/c/DLib_Config_Normal.h"'    
    CFLAGS += ' -Ol'    
    CFLAGS += ' --use_c++_inline'
        
    AFLAGS = ''
    AFLAGS += ' -s+' 
    AFLAGS += ' -w+' 
    AFLAGS += ' -r' 
    AFLAGS += ' --cpu Cortex-M3' 
    AFLAGS += ' --fpu None'

LFLAGS = ' --config stm32f10x_flash.icf'
    LFLAGS += ' --redirect _Printf=_PrintfTiny' 
    LFLAGS += ' --redirect _Scanf=_ScanfSmall' 
    LFLAGS += ' --entry __iar_program_start'

EXEC_PATH = IAR_PATH + '/arm/bin/'
    POST_ACTION = ''
```

SConstruct代码如下：
```import os
import sys
import rtconfig

if os.getenv('RTT_ROOT'):
    RTT_ROOT = os.getenv('RTT_ROOT')
else:
    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')

sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
from building import *

TARGET = 'rtthread-myboard.' + rtconfig.TARGET_EXT

env = Environment(tools = ['mingw'],
	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
	AR = rtconfig.AR, ARFLAGS = '-rc',
	LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
env.PrependENVPath('PATH', rtconfig.EXEC_PATH)

if rtconfig.PLATFORM == 'iar':
	env.Replace(CCCOM = ['$CC $CCFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS -o $TARGET $SOURCES'])
	env.Replace(ARFLAGS = [''])
	env.Replace(LINKCOM = ['$LINK $SOURCES $LINKFLAGS -o $TARGET --map project.map'])

Export('RTT_ROOT')
Export('rtconfig')

# prepare building environment
objs = PrepareBuilding(env, RTT_ROOT)

# myboard firemare library building script
objs = objs + SConscript( GetCurrentDir() + '/CMSIS/SConscript', variant_dir='build/bsp/CMSIS', duplicate=0)
 
#myboard application building script
objs = objs + SConscript( GetCurrentDir() + '/applications/SConscript', variant_dir='build/bsp/applications', duplicate=0)

#myboard drivers building scipt
objs = objs + SConscript( GetCurrentDir() + '/drivers/SConscript', variant_dir='build/bsp/drivers', duplicate=0)

# build program 
env.Program(TARGET, objs)
 
# end building 
EndBuilding(TARGET)
```
Sconscript代码如下：
```# for module compiling
import os
Import('RTT_ROOT')

cwd = str(Dir('#'))
objs = []
list = os.listdir(cwd)

for d in list:
    path = os.path.join(cwd, d)
    if os.path.isfile(os.path.join(path, 'SConscript')):
        objs = objs + SConscript(os.path.join(d, 'SConscript'))

Return('objs')
```

3 个回答

活出自我 2015-03-30

这家伙很懒，什么也没写！

3. applications文件夹下包含application.c、startup.c、Sconscript三个文件。application.c是一个点灯测试程序。startup.c是相关的初始化程序。Sconscript内容如下。

```
Import('RTT_ROOT')
Import('rtconfig')
from building import *

cwd     = os.path.join(str(Dir('#')), 'applications')
src	= Glob('*.c')
CPPPATH = [cwd, str(Dir('#'))]

group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)

Return('group')

```

4. CMSIS文件夹下包含CoreSupport、DeviceSupport两个文件夹和一个Sconscript文件。CoreSupport文件夹下包含core_cm3.c和core_cm3.h两个文件，两个文件拷贝于stm32f107文件夹先，不做任何修改。DeviceSupport文件夹下包含startup_cm32gpm3.s和cm32gpm3.h两个文件。其中startup_cm32gpm3.s为在裸机下正常运行的启动文件，没有做任何修改。cm32gpm3.h为在裸机下正常运行的系统寄存器等定义声明的头文件，没有做任何修改。SConscript内容如下。

```
Import('RTT_ROOT')
Import('rtconfig')
from building import *

cwd = GetCurrentDir()

# add for startup script 
src += ['DeviceSupport/startup_cm32gpm3.s']

CPPPATH = [cwd + '/DeviceSupport/']

if GetDepend(['RT_USING_BSP_CMSIS']):
    CPPPATH += [cwd + '/CoreSupport/']
    src += ['CoreSupport/core_cm3.c']
elif GetDepend(['RT_USING_RTT_CMSIS']):
    CPPPATH += [RTT_ROOT + '/components/CMSIS/Include']

group = DefineGroup('CMSIS', src, depend = [''], CPPPATH = CPPPATH)

Return('group')

```

5. drivers文件夹下为在裸机下正常运行的相关模块的文件，比如SPI、DMA等。SConscript内容如下。

```
Import('RTT_ROOT')
Import('rtconfig')
from building import *

cwd     = os.path.join(str(Dir('#')), 'drivers')

# add the general drvers.
src = Glob('*.c')
   
CPPPATH = [cwd]

group = DefineGroup('Drivers', src, depend = [''], CPPPATH = CPPPATH)

Return('group')

```