STM32外扩RAM做变量定义与内部RAM做堆栈的设置[借鉴].pdf
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STM32 外扩 RAM 做变量定义与内部 RAM 做堆栈的设置
说明：当 STM32 上运行 UC/OSII 和 UC/GUI 时，STM32 内部自带的 RAM 可能不够用，这
就需要 STM32 的外扩 RAM 功能，内部 RAM 作为中断服务程序的堆栈使用，而外部 RAM
作为存放临时变量的地方和 UC/OSII 的任务切换用堆栈，具体配置如下：
1. 修改启动代码
我使用的开发板外扩了 512K 字节的 RAM ，分配的地址为 BANK1 的第 3 个区，即起始地
址为 0x68000000,大小为 0x80000
启动代码如下：
;******************** (C) COPYRIGHT 2009 STMicroelectronics ********************
;* File Name : startup_stm32f10x_hd.s
;* Author : MCD Application Team
;* Version : V3.1.0
;* Date : 06/19/2009
;* Description : STM32F10x High Density Devices vector table for RVMDK
;* 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 external SRAM mounted on STM3210E-EV AL 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.
;******************************************************************************
*
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