Question

我正在为MSP430微控制器编写C代码，我想将全局变量锁定到RAM中的特定地址。

原因是因为我在RAM地址的末尾有一个堆栈，并向下向低地址增长。当堆栈溢出时，它会开始覆盖存储在堆栈旁边的RAM中的全局变量。所以我想写一个紧靠堆栈旁边的水印并检查它是否有溢出。

Answer 1

如果你知道MSP430设备上堆栈的末端应该在哪里，你可以这样做，例如：

int* ptr;           // will point to end of stack
ptr = (int*)0x0600; // memory address of the end of the stack
*ptr = 0x1234;      // value to assign to memory

这是TI论坛上有同样问题的人......看起来很有帮助：http://e2e.ti.com/support/development_tools/compiler/f/343/t/92002.aspx

Answer 2

StackWatch＆amp;用于Code Composer Studio的StackIntact MSP430代码

#include <string.h> // C string functions

unsigned int StackWatch(unsigned char fill);//prototype

const char stackstr[]="#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=";
//^stackstr needs to have enough characters to cover the size of stack 'intactness' you desire

#pragma DATA_SECTION (_stackTAIL, ".stack");//locate this variable at the stacks end (lowest address)
const char _stackTAIL;//don't futz with this variable //DANGEROUS

unsigned int stacktail=0;

unsigned int StackWatch(unsigned char fill)
{
 if (stacktail==0)
     {
         stacktail=(unsigned int)&_stackTAIL; //debugging
         strncpy((void *)stacktail ,stackstr,fill);
     }
 if(fill==0)stacktail=0;//discard the pointer

 return stacktail;
}//StackWatch



unsigned char StackIntact(unsigned char CHRS)
{
     if (stacktail==0)return 0;

     if (CHRS>strlen(stackstr))CHRS=strlen(stackstr);

     return strncmp((void *)stacktail, stackstr, CHRS);

}//StackIntact

////USE IT LIKE THIS>>
//in main only once as close to the beginning as possible..

//StackWatch(20); ///Make sure you have enough chars in the stackstr const...


//in a loop somewhere>>

//if(StackIntact(20))
//.ERROR CONDITION.//blink led or something..

//if it doesn't ==0 then the stack is not intact for that many characters

//////////////
//WHEN YOU ARE DONE WITH IT>>
//StackWatch(0);//discards the pointer to the end of the stack

最初发布在此http://forums.hackaday.com/viewtopic.php?f=5&t=2998

我不知道我将其保留在生产代码中，但它确实对调试代码非常方便

也许......如果出现问题，重置可能会派上用场，但我认为它会再次发生，因此在生产质量代码中毫无意义是的，你可以通过CCS和诸如此类的东西来做到这一点，但那也是一个PITA

另请注意，这适用于CCS（Code Composer Studio）#pragma DATA_SECTION（_stackTAIL，＆＃34; .stack＆＃34;）是编译器特定的名称和编译指示，因此您可能需要使用不同的方法来获取如上所述的地址

全局变量分配RAM地址

2 个答案: