如何在IAR编译器中的特定位置放置变量或函数?

时间:2017-02-07 09:41:53

标签: arm iar

我正在使用IAR Embedded Workbench for Renesas Syenrgy(ARM cortex M4)7.40.5.9722

代码闪存大小:1MB

请考虑以下示例:

void function (void)
{
     unsigned char a;
     a = a+1;
}

我想将此功能放在flash中的特定位置。 什么是为此代码定义用户定义部分的方法。

我已经阅读了IAR编译器用户指南,并实现了如下所述的方法:

#pragma default_function_attribute = @ "MY_FUNC"
void function (void)
{
     unsigned char a;
     a = a + 1;
}
#pragma default_function_attribute =

在.icf文件中,我添加了以下部分:

define symbol region_VECT_start    = 0x00000000;
define symbol region_VECT_end      = 0x000003FF;
define symbol region_ROMREG_start  = 0x00000400;
define symbol region_ROMREG_end    = 0x000004FF;
define symbol region_FLASH_start   = 0x00000500;
define symbol region_FLASH_end     = 0x000BFFFF;  // Fklsh end address is modified from 0x000FFFFF to 0x000BFFFF
define symbol region_MY_FUNC_start = 0x000C0000;  // This statement is added
define symbol region_MY_FUNC_end   = 0x000FFFFF;  // This statement is added
define symbol region_RAM_start     = 0x20000000;
define symbol region_RAM_end       = 0x2002FFFF;
define symbol region_DF_start      = 0x40100000;
define symbol region_DF_end        = 0x40103FFF;
define symbol region_QSPI_start    = 0x60000000;
define symbol region_QSPI_end      = 0x63FFFFFF;

/* Stack and heap sizes are defined in bsp_cfg.h */

define memory mem with size     = 4G;
define region VECT_region       = mem:[from region_VECT_start   to region_VECT_end];
define region ROMREG_region     = mem:[from region_ROMREG_start to region_ROMREG_end];
define region FLASH_region      = mem:[from region_FLASH_start  to region_FLASH_end];
define region RAM_region        = mem:[from region_RAM_start    to region_RAM_end];
define region DF_region         = mem:[from region_DF_start     to region_DF_end];
define region QSPI_region       = mem:[from region_QSPI_start   to region_QSPI_end];
define region MY_FUNC           = mem:[from region_MY_FUNC_start to region_MY_FUNC_end];  // New section is added

通过这些更改,代码正在正确编译。 但是,"功能"未放置在所需位置0x000C0000

为什么会这样?

2 个答案:

答案 0 :(得分:0)

您可以将_Pragma("location=\"__your_section__\"")放在功能前面。

然后在链接器文件中(例如):

define block __your_section_block__ size = 0x100 { section __your_section__ };

并确保将该行添加到链接器:

place in MY_FUNC   { block __your_section_block__ };

答案 1 :(得分:0)

您应该在.icf文件中将“ MY_FUNC ”的定义更改为“ MY_FUNC_region ”,以避免混淆:

define region MY_FUNC_region     = mem:[from region_MY_FUNC_start to region_MY_FUNC_end];

然后添加以下行,将“ MY_FUNC”代码放入“ MY_FUNC_region”中:

place in MY_FUNC_region   { readonly section MY_FUNC };  

(不确定是否绝对需要“只读”关键字,但对我有用)

或者,或者:

place at address mem:region_MY_FUNC_start { readonly section MY_FUNC};