msp430fr5739 FRAM读写问题

建议先运行下官网例程，通过例程来学习

#if defined(__TI_COMPILER_VERSION__)
#pragma PERSISTENT(FRAM_write)
unsigned long FRAM_write[WRITE_SIZE] = {0};
#elif defined(__IAR_SYSTEMS_ICC__)
__persistent unsigned long FRAM_write[WRITE_SIZE] = {0};
#elif defined(__GNUC__)
unsigned long __attribute__((persistent)) FRAM_write[WRITE_SIZE] = {0};                    //？？？？？？？
#else
#error Compiler not supported!
#endif

请问例程代码这段宏定义中的__((persistent)) FRAM_write[WRITE_SIZE] = {0};   有什么意义，不太理解，查阅数据手册说的很模糊

Here is example code which should show you how to use data in FRAM.

#include <msp430.h>

#define WRITE_SIZE      128

void FRAMWrite(void);

unsigned char count = 0;
unsigned long data;

#if defined(__TI_COMPILER_VERSION__)
#pragma PERSISTENT(FRAM_write)
unsigned long FRAM_write[WRITE_SIZE] = {0};
#elif defined(__IAR_SYSTEMS_ICC__)
__persistent unsigned long FRAM_write[WRITE_SIZE] = {0};
#elif defined(__GNUC__)
unsigned long __attribute__((persistent)) FRAM_write[WRITE_SIZE] = {0};
#else
#error Compiler not supported!
#endif

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop WDT

    // Configure GPIO
    P1OUT &= ~BIT0;                         // Clear P1.0 output latch for a defined power-on state
    P1DIR |= BIT0;                          // Set P1.0 to output direction

    // Disable the GPIO power-on default high-impedance mode to activate
    // previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    // Initialize dummy data
    data = 0x00010001;

    while(1)
    {
        data += 0x00010001;
        FRAMWrite();
        count++;
        if (count > 100)
        {
            P1OUT ^= 0x01;                  // Toggle LED to show 512K bytes
            count = 0;                      // ..have been written
            data = 0x00010001;
        }
    }
}

void FRAMWrite(void)
{
    unsigned int i = 0;

    for (i = 0; i < WRITE_SIZE; i++)
    {
        FRAM_write[i] = data;
    }
}

你看到前面的#if defined没？ 一般编译器如CCS，运行你这段程序时只会执行这句#pragma PERSISTENT(FRAM_write) 在FRAM中生成地址的。同理unsigned long __attribute__((persistent)) FRAM_write[WRITE_SIZE] = {0};  的作用同#pragma PERSISTENT(FRAM_write) 只是编译器不同罢了。