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请问编译器提示 Error[Ta028]: Placing a located variable above 0xffff is not allowed 的原因是什么？

LEI ZHENG2
Prodigy 30 points
Other Parts Discussed in Thread: MSP430F2618

IAR WorkBench 5.1，使用msp430f2618，main memory 0x03100 - 0x1FFFF，想将变量存入flash，比如

const double data @ 0xFC00 = 0.1; 这样没有问题。可如果将变量存储在0xFFFF之外，比如

const double data @ 0x1FC00 = 0.1; 则会报错 Error[Ta028]: Placing a located variable above 0xffff is not allowed

请问为什么不能将变量放置在高于0x0FFFF的地址？ flash应该还有空间。

  • 0
    Prodigy 30 points

    问题可能出在iar 编译器的设置上， general options-->data model，有small，medium，large三个选项

    同样的程序，

    const double data01 @ 0x1FC00 = 0.1;

    double *p;

    p = (double *)(0x1FC00);

    选择large，无报错，无警告

    选择medium，无报错，有警告

    p = (double *)(0x1FC00);     <---Warning[Pe1053]: conversion from integer to smaller pointer

    选择small，有报错，有警告

    p = (double *)(0x1FC00);     <---Warning[Pe1053]: conversion from integer to smaller pointer

    const double data01 @ 0x1FC00 = 0.1;    <-----Error[Ta028]: Placing a located variable above 0xffff is not allowed

    为什么会有这种差异？这个得查编译器的文档吧？

  • 0
    TI__Guru**** 252096 points

    可以查看下文档

    MSP430 IAR C/C++ Compiler  Reference Guide

    http://perso.citi.insa-lyon.fr/afraboul/rts6/doc/EW430_CompilerReference.pdf   13页的Data storage

  • 0
    Intellectual 337 points

    如 1楼所说，需要 修改配置， 如果超过16位 地址空间，就要选择 large~~