MDK 代码烧录到RAM区运行
- 环境
- 配置
- 设置分散加载文件
- 启动文件修改
- 设置外部调试器烧录
- 建立函数入口
- 半主机问题导致BKPT 0xAB
有一个需求，除了IAR以及GCC的版本工程还需要MDK版本，为了实现最小的工程环境，flash烧录算法也没有，这时需要直接跑在RAM中
这里以一个最小的平台为例（不含外设驱动）
关联 制作flash算法文件参考
环境
MDK：v5.39
编译器：armclang
平台：arm cortex-m3
配置
我的内存地址：0x10000000 - 0x100FFFFF
编写调试配置文件（设置栈、PC、中断向量表）RAM_Debug.ini
/*----------------------------------------------------------------------------
* Name: RAM_Debug.ini
* Purpose: RAM Debug Initialization File
* Note(s):
*----------------------------------------------------------------------------
* This file is part of the uVision/ARM development tools.
* This software may only be used under the terms of a valid, current,
* end user licence from KEIL for a compatible version of KEIL software
* development tools. Nothing else gives you the right to use this software.
*
* This software is supplied "AS IS" without warranties of any kind.
*
* Copyright (c) 2008-2011 Keil - An ARM Company. All rights reserved.
*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
Setup() configure PC & SP for RAM Debug
*----------------------------------------------------------------------------*/
FUNC void Setup (void) {
SP = _RDWORD(0x10000000); // Setup Stack Pointer
PC = _RDWORD(0x10000004); // Setup Program Counter
_WDWORD(0xE000ED08, 0x10000000); // Setup Vector Table Offset Register
}
FUNC void OnResetExec (void) { // executes upon software RESET
Setup(); // Setup for Running
}
load %L incremental // load %L incremental 增量下载模式节省时间
Setup(); // Setup for Running
g, main
设置应用
设置分散加载文件
前512KB用于代码段只读
后512KB用于变量
命名xxx.sct
; *************************************************************
; *** Scatter-Loading Description File generated by uVision ***
; *************************************************************
LR_IROM1 0x10000000 0x80000 { ; load region size_region
ER_IROM1 0x10000000 0x80000 { ; load address = execution address
*.o (RESET, +First)
*(InRoot$$Sections)
.ANY (+RO)
.ANY (+XO)
}
RW_IRAM1 0x10080000 0x7F000 { ; 512KB Data
;*(USE_VAR_SPACE)
.ANY (+RW +ZI)
}
;ARM_LIB_HEAP 0x100FF000 EMPTY 0x800 {
;}
;ARM_LIB_STACK 0x100FF800 EMPTY 0x800 {
;}
;ARM_LIB_STACKHEAP 0x100FF000 EMPTY 0x1000 {
;}
}
设置应用
这里保持一致
启动文件修改
命名为xxx.s
Stack_Size EQU 0x400
AREA STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem SPACE Stack_Size
__initial_sp
; <h> Heap Configuration
; <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>
Heap_Size EQU 0x400
AREA HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem SPACE Heap_Size
__heap_limit
PRESERVE8
THUMB
; Vector Table Mapped to Address 0 at Reset
AREA RESET, DATA, READONLY
EXPORT __Vectors
EXPORT __Vectors_End
EXPORT __Vectors_Size
IMPORT SysTick_Handler
__Vectors DCD __initial_sp ; Top of Stack
DCD Reset_Handler ; Reset Handler
DCD NMI_Handler ; NMI Handler
DCD HardFault_Handler ; Hard Fault Handler
DCD MemManage_Handler ; MPU Fault Handler
DCD BusFault_Handler ; Bus Fault Handler
DCD UsageFault_Handler ; Usage Fault Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVC_Handler ; SVCall Handler
DCD DebugMon_Handler ; Debug Monitor Handler
DCD 0 ; Reserved
DCD PendSV_Handler ; PendSV Handler
DCD SysTick_Handler ; SysTick Handler
; External Interrupts
;DCD WWDG_IRQHandler ; Window WatchDog interrupt ( wwdg1_it)
__Vectors_End
__Vectors_Size EQU __Vectors_End - __Vectors
AREA |.text|, CODE, READONLY
; Reset handler
Reset_Handler PROC
EXPORT Reset_Handler [WEAK]
IMPORT SystemInit
IMPORT __main
LDR R0, =SystemInit
BLX R0
LDR R0, =__main
BX R0
ENDP
; Dummy Exception Handlers (infinite loops which can be modified)
NMI_Handler PROC
EXPORT NMI_Handler [WEAK]
B .
ENDP
HardFault_Handler\
PROC
EXPORT HardFault_Handler [WEAK]
B .
ENDP
MemManage_Handler\
PROC
EXPORT MemManage_Handler [WEAK]
B .
ENDP
BusFault_Handler\
PROC
EXPORT BusFault_Handler [WEAK]
B .
ENDP
UsageFault_Handler\
PROC
EXPORT UsageFault_Handler [WEAK]
B .
ENDP
SVC_Handler PROC
EXPORT SVC_Handler [WEAK]
B .
ENDP
DebugMon_Handler\
PROC
EXPORT DebugMon_Handler [WEAK]
B .
ENDP
PendSV_Handler PROC
EXPORT PendSV_Handler [WEAK]
B .
ENDP
; SysTick_Handler PROC
; EXPORT SysTick_Handler [WEAK]
; B .
; ENDP
Default_Handler PROC
;EXPORT WWDG_IRQHandler [WEAK]
;WWDG_IRQHandler
B .
ENDP
ALIGN
;*******************************************************************************
; User Stack and Heap initialization
;*******************************************************************************
IF :DEF:__MICROLIB
EXPORT __initial_sp
EXPORT __heap_base
EXPORT __heap_limit
ELSE
IMPORT __use_two_region_memory
EXPORT __user_initial_stackheap
__user_initial_stackheap
LDR R0, = Heap_Mem
LDR R1, =(Stack_Mem + Stack_Size)
LDR R2, = (Heap_Mem + Heap_Size)
LDR R3, = Stack_Mem
BX LR
ALIGN
ENDIF
END
设置外部调试器烧录
建立函数入口
/**
* @brief 函数主入口
*
*/
int main(void)
{
return 0;
}
半主机问题导致BKPT 0xAB
MDK开启系统函数重定向功能
ref: https://developer.arm.com/documentation/ka002219/latest
