keil如何设置overlay,避免局部变量覆盖.新手求助!!!

2011-08-14 10:48:52 1.3k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Keil C51 L15警告：嵌入式开发中的函数重入与内存覆盖冲突解析在嵌入式系统开发中，函数重入性和内存管理是确保代码稳定性的核心概念。Keil C51编译器针对资源受限的MCU（如8051）采用覆盖分析技术优化RAM使用，通过静态分配函数局部变量地址来节省内存。然而，当中断服务程序与主循环可能同时调用同一函数时，会引发数据竞争风险，导致局部变量被意外覆盖。这种潜在冲突在编译链接阶段表现为L15警告，其本质是链接器检测到不可重入函数在并发执行路径上的调用冲突。理解并解决这一问题对于开发可靠的嵌入式、物联网设备至关重要，尤其是在使用中断、多任务调度等复杂机制时。本文通过剖析覆阅读详情

keil用变量覆盖的方法,分配局部变量.
我用SMALL RTOS51 写任务时,它会把我任务的局部变量分配到同一个内存中,程序就错了
在OVERLAY里边设置,可以分配在不同的空间,可是我不懂怎么设置!

有4个任务，LED0到LED3
为了防止keil使局部变量覆盖，设置overlay仿照例子，我填入的内容是main~LED1,main~LED2,main~LED3
程序是实时运行起来了,但是不知道上面填入的内容是什么意思.

英文有点差,下面是关于overlay的介绍
Removing Call References Between Segments

OVERLAY (sfname-caller ~ sfname-callee)

OVERLAY (sfname-caller ~ (sfname-callee, sfname-callee))
This form of the OVERLAY directive specifies that references from sfname-caller to sfname-callee are to be removed from overlay analysis.

Function references are automatically added to overlay analysis when you reference one function inside another (typically, these references are function calls). If you reference the address of a function (without calling the function), the linker considers this to be a reference between the two functions and it is included in overlay analysis. You may remove this reference manually using this form of the OVERLAY directive.

Referring to the following overlay map:

SEGMENT DATA_GROUP
+--> CALLED SEGMENT START LENGTH
----------------------------------------------
?PR?_FUNC?DMAIN ----- -----
+--> ?PR?_FUNC_A?DMAIN
+--> ?PR?_FUNC_B?DMAIN
You may remove the references from ?PR?_FUNC?DMAIN to ?PR?_FUNC_A?DMAIN and ?PR?_FUNC_B?DMAIN with the following OVERLAY command:

OVERLAY(?PR?_FUNC?DMAIN ~ (?PR?_FUNC_A?DMAIN,?PR?_FUNC_B?DMAIN))

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