[参考译文] MSP430FR2311：定义为 persistent 的变量为只读

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1268872/msp430fr2311-variable-defined-as-persistent-is-read-only

您好！

我正在尝试使用 PERSISTENT pragma 使变量保持持久性。 该代码是 Andreas Dannenberg 所做的示例的副本(发布在 TI 论坛上某处)：

//============================================================================
// Name        : #pragma PERSISTENT Test for C++
// Author      : Andreas Dannenberg
// Version     : 1.0
//============================================================================

#include "msp430.h"

// Declare a simple class that maintains a static counter variable. Note that
// only one copy of this variable is shared by all instances of this class.
class PersistentTest {
public:
    int getCounter() {
        return counter;
    }
    void setCounter(int newCounterValue) {
        counter = newCounterValue;
    }
    void incrementCounter() {
        counter++;
    }
private:
    static int counter;
};

// In C++ the counter needs to be explicitly defined/initialized. For data
// members this has to be done outside the class in the namespace scope. This
// is also where we are going to apply the PERSISTENT pragma.
#pragma PERSISTENT
int PersistentTest::counter = 0;

int main() {
    // Stop the MSP430's watchdog timer
    WDTCTL = WDTPW | WDTHOLD;

    // Create an instance of our test class
    PersistentTest persistentTest;

    // Call the member function to increment the class-internal counter
    persistentTest.incrementCounter();

    // Obtain a snapshot of the class-internal counter
    volatile int currentCounterValue = persistentTest.getCounter();

    // Set breakpoint here and use the debugger to look at the value of
    // 'currentCounterValue'. Then, reset the device and run and re-inspect.
    __no_operation();

    return 0;
}

我已经创建了一个空白项目、上传了此代码、但 persistent 变量不会更改值。 它将保持为0。 调试器不能更改该值(程序在断点处停止)：它可以简单地反转至0。

map 文件显示该变量位于 persistent 段中：

 output                                  attributes/
section   page    origin      length       input sections
--------  ----  ----------  ----------   ----------------
.TI.persistent 
*          0    0000f100    00000002     
                  0000f100    00000002     main.obj (.TI.persistent)

问题可能是什么？

编辑：在一个电源循环(关闭电源几秒钟)后、这个示例就有效了。 但是、我有一个更复杂的程序、仍然显示相同的行为。 线索非常受欢迎

谢谢。

尤斯图斯