使用IAR EWARM手动将.data段从闪存复制到ram

void copy_data_to_ram(void) {
    extern unsigned char _etext; // Flash end address
    extern unsigned char _data;  // Start of .data section in RAM
    extern unsigned char _edata; // End of .data section in RAM

    unsigned char *src = &_etext; // Source address in flash
    unsigned char *dst = &_data;  // Destination address in RAM

    while (dst < &_edata) {
        *dst++ = *src++;
    }
}

int main(void) {
    // 初始化硬件
    // ...

    // 复制 .data 段到 RAM
    copy_data_to_ram();

    // 初始化全局变量（如果需要）
    // ...

    // 启动主程序
    while (1) {
        // Main loop
    }
}

/* Define memory regions */
MEMORY
{
    FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 256K
    RAM (rw)   : ORIGIN = 0x20000000, LENGTH = 64K
}

/* Define sections */
SECTIONS
{
    .text : {
        *(.text*)
    } > FLASH

    .data : {
        _data = .;
        *(.data*)
        _edata = .;
    } > RAM AT > FLASH

    .bss : {
        _bss = .;
        *(.bss*)
        _ebss = .;
    } > RAM
}