[参考译文] MSP430FR2355：Energia + CCS -无法获取存储在 FRAM 中而非 RAM 中的.noinit 变量

https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1011512/msp430fr2355-energia-ccs---unable-to-get-noinit-variables-to-be-stored-in-fram-instead-of-ram

我一直在尝试在 FRAM 中正确设置在循环通电和闪存上传之间持续存在的变量。

我可以告诉大家的问题是 Energia 中的.noinit 位于 RAM 中、而不是 FRAM 中。

尝试了许多不同的组合后、如果我将这些变量放入.text、我可以使它们在功率周期之间保持不变。 例如：   unsigned long __attribute__((section(".text"))) persist;

我已经尝试了几乎所有可以在网上找到的设置组合、尝试使.noinit 正常工作。

以下是几个、全部在一个 sketch 中：

#include <Energia.h>
#include <Arduino.h>
#include <msp430.h>

// most launchpads have a red LED
#define LED RED_LED


//e2e.ti.com/.../msp430fr6989-need-read-and-write-example-code-for-fram-on-the-msp-device-for-energia
//github.com/.../70
int i PLACE_IN_FRAM;

//forum.43oh.com/.../
//forum.43oh.com/.../
uint8_t lo __attribute__((section(".infomem")));

//www.element14.com/.../msp430fr2633-fram

//#pragma PERSISTENT(var)  
#pragma NOINIT(var)  
unsigned long var=0;  

//forum.43oh.com/.../
//stealing the noinit from www.element14.com/.../msp430fr2633-fram
unsigned long __attribute__((section(".noinit"))) persist;


#pragma NOINIT(thingsToStore)
#pragma DATA_SECTION(thingsToStore, ".text")

uint16_t __attribute__((section(".text"))) thingsToStore[10] ;





// the setup routine runs once when you press reset:
void setup()
{
  
  //this breaks the code
  //WDTCTL = WDTPW | WDTHOLD; // Stop WDT
  
  // initialize the digital pin as an output.
  Serial1.begin(9600);
  pinMode(LED, OUTPUT);
  delay(100);
  Serial1.println("hello world!");

    
  disableWatchDog();
    i = 0;
    enableWatchDog();
  //i = 0;
}

// the loop routine runs over and over again forever:
void loop()
{
  disableWatchDog();
  //github.com/.../70
  Serial1.print("hello world! ");
  Serial1.println(i++);
  enableWatchDog();


disableWatchDog();
//forum.43oh.com/.../
 SYSCFG0 &= ~PFWP;                   // Program FRAM write enable
        lo = lo + 1;                       // Record in FRAM
        SYSCFG0 |= PFWP;                    // Program FRAM write protected (not writable)

  Serial1.print("lo and behold: ");
  Serial1.println(lo);
enableWatchDog();

//www.element14.com/.../msp430fr2633-fram
//this at least increments, but gets erased on startup
SYSCFG0 = FRWPPW | DFWP;            // Program FRAM write enable  
var++;                             // Increment the variable (aka, treat it like any other variable)  
SYSCFG0 = FRWPPW | PFWP | DFWP;     // Program FRAM write protected (not writable)  


  Serial1.print("no show: ");
  Serial1.println(var);

//forum.43oh.com/.../

//it seems that messing with the wdt isn't needed :)
//disableWatchDog();
SYSCFG0 = FRWPPW | DFWP;   
 persist++;
    Serial1.print("does percistance pay: ");
  Serial1.println(persist);
 //enableWatchDog();

  thingsToStore[0]++;
  Serial1.print("in the first box: ");
  Serial1.println(thingsToStore[0]);
  Serial1.print("and in the second... ");
  Serial1.println(thingsToStore[5],HEX);
SYSCFG0 = FRWPPW | PFWP | DFWP;  
  //this is no logic to what the initial values are if they weren't stored correctly


  digitalWrite(LED, HIGH); // turn the LED on (HIGH is the voltage level)
  delay(1000);             // wait for a second
  digitalWrite(LED, LOW);  // turn the LED off by making the voltage LOW
  delay(1000);             // wait for a second

  
}

在有关将变量存储在 FRAM 中的应用手册中、他们讨论了需要修改链接器文件以将.init 移动到 FRAM 中。

对于.cmd 文件与示例中的文件相匹配的常规 CCS 工程、这似乎足够简单。

但我不知道如何修改似乎是 Energia 存储器映射的 MSP430.x/memory.x 文件。

TL：DR：如果我需要修改链接器以使 noinit 正常工作、那么我该如何做(对于 Energia)？ 如果不是、最好的方法是什么？

谢谢、

Matt