Notes05: 自写库_改进寄存器点亮LED

STM32寄存器操作改进：点亮LED

原创已于 2023-04-07 09:36:37 修改 · 198 阅读

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#stm32 #嵌入式硬件

于 2023-03-23 06:44:49 首次发布

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野火霸道V2学习笔记

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文章介绍了如何通过改进寄存器操作来点亮野火霸道开发板上的LED，主要涉及STM32F103ZET6芯片，使用Keil5开发环境。通过对stm32f10x.h文件中的宏定义优化，简化了对RCC_APB2ENR、GPIOB_CRL和GPIOB_ODR等寄存器的访问，以实现IO端口B的时钟开启和GPIOB端口0的推挽输出模式设置，最终控制LED的亮灭。

改进寄存器点亮LED代码

野火霸道开发板学习笔记

野火霸道开发板学习笔记

信息说明

开发板: 野火霸道V2
芯片型号: STM32F103ZET6
下载器型号: 野火fireDAP下载器(高速版)
软件环境: Keil5(MDK-ARM V5.15)
芯片包型号: Keil.STM32F1xx_DFP.1.1.0 注: 亲测版本2.4.0不可用
操作系统 : Win11

寄存器点亮LED改进

原理分析

主要是对外设进行宏定义方便使用

在stm32f10x.h文件中

// 外设 peripherals
#define PERIPH_BASE ((unsigned int)0x40000000) // 寄存器组起始地址
#define APB1PERIPH_BASE PERIPH_BASE // APB1 peripheral
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000) // APB2 peripheral
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000) // AHB peripheral // DMA1开始, 方便计算

#define RCC_BASE (AHBPERIPH_BASE + 0x1000) // RCC
#define GPIOB_BASE (APB2PERIPH_BASE + 0x0C00) // GPIOB

#define RCC_APB2ENR *(unsigned int *)(RCC_BASE + 0x18) // RCC_APB2ENR
#define GPIOB_CRL *(unsigned int *)(GPIOB_BASE + 0x00) // GPIOB_CRL
#define GPIOB_CRH *(unsigned int *)(GPIOB_BASE + 0x04) // GPIOB_CRH
#define GPIOB_ODR *(unsigned int *)(GPIOB_BASE + 0x0C) // GPIOB_ODR

其中外设基地址查表, 如下图

在这里插入图片描述

值得注意的是AHB是从DMA1为基地址, 为了方便计算偏移量, 故AHB的基地址未定义为SDIO处地址

具体的外设使用指针方法可以直接操作, 如将GPIOB_CRL定义为*(unsigned int *)类型后, 对GPIOB_CRL的操作可以操纵该内存所对应的寄存器

具体的外设的绝对地址通过查表得知偏移量, 绝对地址 = 基地址 + 偏移量

如GPIOB_CRL

在这里插入图片描述

GPIOB的起始地址为0x4001 0C00

在这里插入图片描述

GPIOx_CRL的偏移地址为0x00

故GPIOB_CRL的绝对地址为0x4001 0C00 + 0x00 = 0x4001 0C00

由以上原理进行宏定义, 其余部分在Note03中由详细讲解

注: C语法补充

#if a // a为表达式
// 若a为真, 则编译以下内容, 若a为假, 则if以下else以上内容不编译
#elif b
// 相当于else if
#else
// 相当于else
#endif // 结束条件编译

main文件:

#include "stm32f10x.h"

int main(void)
{
    # if 0 // 直接操作寄存器
    *(unsigned int *)0x40021018 |= (1 << 3); // 打开时钟, 控制RCC_APB2ENR寄存器, 实现IO端口B时钟开启
    /*
     * RCC_APB2ENR寄存器(Address : 0x40021000(RCC) + 0x18)
     * Bit3 : IOPBN : IO端口B时钟使能(I/O port B clock enable)
     * 由软件置1或请0
     * 0 : IO端口B时钟关闭
     * 1 : IO端口B时钟开启
     */
    *(unsigned int *)0x40010C00 |= ((1) << (4*0)); // 配置IO口为输出, 控制CRL寄存器, 实现GPIOB端口0为10MHz的推挽输出模式
    /*
     * GPIOx_CRL 端口配置低寄存器(Address : 0x40010C00(GPIO端口B)  + 0x00)
     * Bit32 CNF0 : 00 通用推挽输出模式
     * Bit10 MODE0 : 01 输出模式, 最大速度10MHz
	 * 
	 * Notes:
	 * 分成n个一组, 对清零后的第i组设置成某二进制数, 该数对应的十进制为b
	 * a |= (b << n * i);
	 * 此时 |= ((1) << (4 * 0)); // 分成4个一组, 将第0组(即bit3~0)设置为1对应的二进制(即0001B)
     */
    *(unsigned int *)0x40010C0C &= ~(1 << 0); // 控制ODR寄存器, 实现GPIOB端口0输出低电平
    /*
     * GPIOx_ODR 端口输出数据寄存器(Address : 0x40010C00(GPIO端口B)+ 0x0C)
     * Bit0 ODR0 : 端口输出数据
	 * 
	 * Notes:
	 * 将变量a的Bit n清零, a &= ~(1 << n);
     * 
     * 注 : 
     * 根据原理图LED_G的阳极为3V3, 阴极接PB0
     */

    #else
    // *(unsigned int *)0x40021018 |= (1 << 3); // 打开时钟, 控制RCC_APB2ENR寄存器, 实现IO端口B时钟开启
    RCC_APB2ENR |= (1 << 3);
    /*
     * RCC_APB2ENR寄存器(Address : 0x40021000(RCC) + 0x18)
     * Bit3 : IOPBN : IO端口B时钟使能(I/O port B clock enable)
     * 由软件置1或请0
     * 0 : IO端口B时钟关闭
     * 1 : IO端口B时钟开启
     */

    // *(unsigned int *)0x40010C00 |= ((1) << (4*0)); // 配置IO口为输出, 控制CRL寄存器, 实现GPIOB端口0为10MHz的推挽输出模式
    GPIOB_CRL &= ~((0x0F) << (4*0)); // 清零
    GPIOB_CRL |= ((1) << (4*0));    
    /*
     * GPIOx_CRL 端口配置低寄存器(Address : 0x40010C00(GPIO端口B)  + 0x00)
     * Bit32 CNF0 : 00 通用推挽输出模式
     * Bit10 MODE0 : 01 输出模式, 最大速度10MHz
	 * 
	 * Notes:
	 * 分成n个一组, 对清零后的第i组设置成某二进制数, 该数对应的十进制为b
	 * a |= (b << n * i);
	 * 此时 |= ((1) << (4 * 0)); // 分成4个一组, 将第0组(即bit3~0)设置为1对应的二进制(即0001B)
     */

    // *(unsigned int *)0x40010C0C &= ~(1 << 0); // 控制ODR寄存器, 实现GPIOB端口0输出低电平
    GPIOB_ODR &= ~(1 << 0);
    /*
     * GPIOx_ODR 端口输出数据寄存器(Address : 0x40010C00(GPIO端口B)+ 0x0C)
     * Bit0 ODR0 : 端口输出数据
	 * 
	 * Notes:
	 * 将变量a的Bit n清零, a &= ~(1 << n);
     * 
     * 注 : 
     * 根据原理图LED_G的阳极为3V3, 阴极接PB0
     */
    #endif

    return 0;
}

/*
 * Notes:
 *
 * 置位 : |= 
 * |= (1 << 3);  // 1左移3位后相或, 把Bit3置位
 * 
 * 复位 : &= ~ 
 * &= ~(1 << 0); 1左移0位取反后相与, 把Bit0复位
 */

void SystemInit(void)
{
    return; // 编译需要
}

stm32f10x.h文件

// 用来存放STM32寄存器映射的代码

// 外设 peripherals
#define PERIPH_BASE ((unsigned int)0x40000000) // 寄存器组起始地址
#define APB1PERIPH_BASE PERIPH_BASE // APB1 peripheral
#define APB2PERIPH_BASE (PERIPH_BASE + 0x10000) // APB2 peripheral
#define AHBPERIPH_BASE (PERIPH_BASE + 0x20000) // AHB peripheral // DMA1开始, 方便计算
                     
#define RCC_BASE (AHBPERIPH_BASE + 0x1000) // RCC
#define GPIOB_BASE (APB2PERIPH_BASE + 0x0C00) // GPIOB

#define RCC_APB2ENR *(unsigned int *)(RCC_BASE + 0x18) // RCC_APB2ENR
#define GPIOB_CRL *(unsigned int *)(GPIOB_BASE + 0x00) // GPIOB_CRL
#define GPIOB_CRH *(unsigned int *)(GPIOB_BASE + 0x04) // GPIOB_CRH
#define GPIOB_ODR *(unsigned int *)(GPIOB_BASE + 0x0C) // GPIOB_ODR

startup_stm32f10x_hd.s文件

;******************** (C) COPYRIGHT 2011 STMicroelectronics ********************
;* File Name          : startup_stm32f10x_hd.s
;* Author             : MCD Application Team
;* Version            : V3.5.0
;* Date               : 11-March-2011
;* Description        : STM32F10x High Density Devices vector table for MDK-ARM 
;*                      toolchain. 
;*                      This module performs:
;*                      - Set the initial SP
;*                      - Set the initial PC == Reset_Handler
;*                      - Set the vector table entries with the exceptions ISR address
;*                      - Configure the clock system and also configure the external 
;*                        SRAM mounted on STM3210E-EVAL board to be used as data 
;*                        memory (optional, to be enabled by user)
;*                      - Branches to __main in the C library (which eventually
;*                        calls main()).
;*                      After Reset the CortexM3 processor is in Thread mode,
;*                      priority is Privileged, and the Stack is set to Main.
;* <<< Use Configuration Wizard in Context Menu >>>   
;*******************************************************************************
; THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
; WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
; AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
; INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
; CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
; INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
;*******************************************************************************

; Amount of memory (in bytes) allocated for Stack
; Tailor this value to your application needs
; <h> Stack Configuration
;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Stack_Size      EQU     0x00000400

                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     0x00000200

                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

__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
                DCD     PVD_IRQHandler             ; PVD through EXTI Line detect
                DCD     TAMPER_IRQHandler          ; Tamper
                DCD     RTC_IRQHandler             ; RTC
                DCD     FLASH_IRQHandler           ; Flash
                DCD     RCC_IRQHandler             ; RCC
                DCD     EXTI0_IRQHandler           ; EXTI Line 0
                DCD     EXTI1_IRQHandler           ; EXTI Line 1
                DCD     EXTI2_IRQHandler           ; EXTI Line 2
                DCD     EXTI3_IRQHandler           ; EXTI Line 3
                DCD     EXTI4_IRQHandler           ; EXTI Line 4
                DCD     DMA1_Channel1_IRQHandler   ; DMA1 Channel 1
                DCD     DMA1_Channel2_IRQHandler   ; DMA1 Channel 2
                DCD     DMA1_Channel3_IRQHandler   ; DMA1 Channel 3
                DCD     DMA1_Channel4_IRQHandler   ; DMA1 Channel 4
                DCD     DMA1_Channel5_IRQHandler   ; DMA1 Channel 5
                DCD     DMA1_Channel6_IRQHandler   ; DMA1 Channel 6
                DCD     DMA1_Channel7_IRQHandler   ; DMA1 Channel 7
                DCD     ADC1_2_IRQHandler          ; ADC1 & ADC2
                DCD     USB_HP_CAN1_TX_IRQHandler  ; USB High Priority or CAN1 TX
                DCD     USB_LP_CAN1_RX0_IRQHandler ; USB Low  Priority or CAN1 RX0
                DCD     CAN1_RX1_IRQHandler        ; CAN1 RX1
                DCD     CAN1_SCE_IRQHandler        ; CAN1 SCE
                DCD     EXTI9_5_IRQHandler         ; EXTI Line 9..5
                DCD     TIM1_BRK_IRQHandler        ; TIM1 Break
                DCD     TIM1_UP_IRQHandler         ; TIM1 Update
                DCD     TIM1_TRG_COM_IRQHandler    ; TIM1 Trigger and Commutation
                DCD     TIM1_CC_IRQHandler         ; TIM1 Capture Compare
                DCD     TIM2_IRQHandler            ; TIM2
                DCD     TIM3_IRQHandler            ; TIM3
                DCD     TIM4_IRQHandler            ; TIM4
                DCD     I2C1_EV_IRQHandler         ; I2C1 Event
                DCD     I2C1_ER_IRQHandler         ; I2C1 Error
                DCD     I2C2_EV_IRQHandler         ; I2C2 Event
                DCD     I2C2_ER_IRQHandler         ; I2C2 Error
                DCD     SPI1_IRQHandler            ; SPI1
                DCD     SPI2_IRQHandler            ; SPI2
                DCD     USART1_IRQHandler          ; USART1
                DCD     USART2_IRQHandler          ; USART2
                DCD     USART3_IRQHandler          ; USART3
                DCD     EXTI15_10_IRQHandler       ; EXTI Line 15..10
                DCD     RTCAlarm_IRQHandler        ; RTC Alarm through EXTI Line
                DCD     USBWakeUp_IRQHandler       ; USB Wakeup from suspend
                DCD     TIM8_BRK_IRQHandler        ; TIM8 Break
                DCD     TIM8_UP_IRQHandler         ; TIM8 Update
                DCD     TIM8_TRG_COM_IRQHandler    ; TIM8 Trigger and Commutation
                DCD     TIM8_CC_IRQHandler         ; TIM8 Capture Compare
                DCD     ADC3_IRQHandler            ; ADC3
                DCD     FSMC_IRQHandler            ; FSMC
                DCD     SDIO_IRQHandler            ; SDIO
                DCD     TIM5_IRQHandler            ; TIM5
                DCD     SPI3_IRQHandler            ; SPI3
                DCD     UART4_IRQHandler           ; UART4
                DCD     UART5_IRQHandler           ; UART5
                DCD     TIM6_IRQHandler            ; TIM6
                DCD     TIM7_IRQHandler            ; TIM7
                DCD     DMA2_Channel1_IRQHandler   ; DMA2 Channel1
                DCD     DMA2_Channel2_IRQHandler   ; DMA2 Channel2
                DCD     DMA2_Channel3_IRQHandler   ; DMA2 Channel3
                DCD     DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5
__Vectors_End

__Vectors_Size  EQU  __Vectors_End - __Vectors

                AREA    |.text|, CODE, READONLY
                
; Reset handler
Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  __main
                IMPORT  SystemInit
                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]
                EXPORT  PVD_IRQHandler             [WEAK]
                EXPORT  TAMPER_IRQHandler          [WEAK]
                EXPORT  RTC_IRQHandler             [WEAK]
                EXPORT  FLASH_IRQHandler           [WEAK]
                EXPORT  RCC_IRQHandler             [WEAK]
                EXPORT  EXTI0_IRQHandler           [WEAK]
                EXPORT  EXTI1_IRQHandler           [WEAK]
                EXPORT  EXTI2_IRQHandler           [WEAK]
                EXPORT  EXTI3_IRQHandler           [WEAK]
                EXPORT  EXTI4_IRQHandler           [WEAK]
                EXPORT  DMA1_Channel1_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel2_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel3_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel4_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel5_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel6_IRQHandler   [WEAK]
                EXPORT  DMA1_Channel7_IRQHandler   [WEAK]
                EXPORT  ADC1_2_IRQHandler          [WEAK]
                EXPORT  USB_HP_CAN1_TX_IRQHandler  [WEAK]
                EXPORT  USB_LP_CAN1_RX0_IRQHandler [WEAK]
                EXPORT  CAN1_RX1_IRQHandler        [WEAK]
                EXPORT  CAN1_SCE_IRQHandler        [WEAK]
                EXPORT  EXTI9_5_IRQHandler         [WEAK]
                EXPORT  TIM1_BRK_IRQHandler        [WEAK]
                EXPORT  TIM1_UP_IRQHandler         [WEAK]
                EXPORT  TIM1_TRG_COM_IRQHandler    [WEAK]
                EXPORT  TIM1_CC_IRQHandler         [WEAK]
                EXPORT  TIM2_IRQHandler            [WEAK]
                EXPORT  TIM3_IRQHandler            [WEAK]
                EXPORT  TIM4_IRQHandler            [WEAK]
                EXPORT  I2C1_EV_IRQHandler         [WEAK]
                EXPORT  I2C1_ER_IRQHandler         [WEAK]
                EXPORT  I2C2_EV_IRQHandler         [WEAK]
                EXPORT  I2C2_ER_IRQHandler         [WEAK]
                EXPORT  SPI1_IRQHandler            [WEAK]
                EXPORT  SPI2_IRQHandler            [WEAK]
                EXPORT  USART1_IRQHandler          [WEAK]
                EXPORT  USART2_IRQHandler          [WEAK]
                EXPORT  USART3_IRQHandler          [WEAK]
                EXPORT  EXTI15_10_IRQHandler       [WEAK]
                EXPORT  RTCAlarm_IRQHandler        [WEAK]
                EXPORT  USBWakeUp_IRQHandler       [WEAK]
                EXPORT  TIM8_BRK_IRQHandler        [WEAK]
                EXPORT  TIM8_UP_IRQHandler         [WEAK]
                EXPORT  TIM8_TRG_COM_IRQHandler    [WEAK]
                EXPORT  TIM8_CC_IRQHandler         [WEAK]
                EXPORT  ADC3_IRQHandler            [WEAK]
                EXPORT  FSMC_IRQHandler            [WEAK]
                EXPORT  SDIO_IRQHandler            [WEAK]
                EXPORT  TIM5_IRQHandler            [WEAK]
                EXPORT  SPI3_IRQHandler            [WEAK]
                EXPORT  UART4_IRQHandler           [WEAK]
                EXPORT  UART5_IRQHandler           [WEAK]
                EXPORT  TIM6_IRQHandler            [WEAK]
                EXPORT  TIM7_IRQHandler            [WEAK]
                EXPORT  DMA2_Channel1_IRQHandler   [WEAK]
                EXPORT  DMA2_Channel2_IRQHandler   [WEAK]
                EXPORT  DMA2_Channel3_IRQHandler   [WEAK]
                EXPORT  DMA2_Channel4_5_IRQHandler [WEAK]

WWDG_IRQHandler
PVD_IRQHandler
TAMPER_IRQHandler
RTC_IRQHandler
FLASH_IRQHandler
RCC_IRQHandler
EXTI0_IRQHandler
EXTI1_IRQHandler
EXTI2_IRQHandler
EXTI3_IRQHandler
EXTI4_IRQHandler
DMA1_Channel1_IRQHandler
DMA1_Channel2_IRQHandler
DMA1_Channel3_IRQHandler
DMA1_Channel4_IRQHandler
DMA1_Channel5_IRQHandler
DMA1_Channel6_IRQHandler
DMA1_Channel7_IRQHandler
ADC1_2_IRQHandler
USB_HP_CAN1_TX_IRQHandler
USB_LP_CAN1_RX0_IRQHandler
CAN1_RX1_IRQHandler
CAN1_SCE_IRQHandler
EXTI9_5_IRQHandler
TIM1_BRK_IRQHandler
TIM1_UP_IRQHandler
TIM1_TRG_COM_IRQHandler
TIM1_CC_IRQHandler
TIM2_IRQHandler
TIM3_IRQHandler
TIM4_IRQHandler
I2C1_EV_IRQHandler
I2C1_ER_IRQHandler
I2C2_EV_IRQHandler
I2C2_ER_IRQHandler
SPI1_IRQHandler
SPI2_IRQHandler
USART1_IRQHandler
USART2_IRQHandler
USART3_IRQHandler
EXTI15_10_IRQHandler
RTCAlarm_IRQHandler
USBWakeUp_IRQHandler
TIM8_BRK_IRQHandler
TIM8_UP_IRQHandler
TIM8_TRG_COM_IRQHandler
TIM8_CC_IRQHandler
ADC3_IRQHandler
FSMC_IRQHandler
SDIO_IRQHandler
TIM5_IRQHandler
SPI3_IRQHandler
UART4_IRQHandler
UART5_IRQHandler
TIM6_IRQHandler
TIM7_IRQHandler
DMA2_Channel1_IRQHandler
DMA2_Channel2_IRQHandler
DMA2_Channel3_IRQHandler
DMA2_Channel4_5_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

;******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE*****