实现各个线程或者各个模块自动初始化加载，避免在main中手动调用各种init()函数，各个模块间可实现高度解藕
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/* 宏定义如下 */#define SECTION_DEF(_level) __attribute__((used,__section__("LoadSection_"_level)))
#define SysLoad_Peripher1(func) const SysLoad_Init_t SysLoad_Peripher1_##func SECTION_DEF("Peripher_1") = {func}
#define SysLoad_Peripher2(func) const SysLoad_Init_t SysLoad_Peripher2_##func SECTION_DEF("Peripher_2") = {func}
#define SysLoad_Peripher3(func) const SysLoad_Init_t SysLoad_Peripher3_##func SECTION_DEF("Peripher_3") = {func}
#define SysLoad_APP(init, app, tcb) const SysLoad_App_t SysLoad_APP_##app SECTION_DEF("APP_1") = {init, app, {0, NULL, 56}}/* 调用代码如下 */
void perFunc1(void)
{printk(DBG_LEVEL_INFO, "fnc1\r\n");return;
}
void perFunc2(void)
{printk(DBG_LEVEL_INFO, "fnc2\r\n");return;
}
void perFunc3(void)
{printk(DBG_LEVEL_INFO, "fnc3\r\n");return;
}SysLoad_Peripher3(perFunc2);
SysLoad_Peripher3(perFunc3);
SysLoad_Peripher3(perFunc1);SysLoad_Peripher2(perFunc2);
SysLoad_Peripher2(perFunc3);
SysLoad_Peripher2(perFunc1);SysLoad_Peripher1(perFunc2);
SysLoad_Peripher1(perFunc3);
SysLoad_Peripher1(perFunc1);
编译后的.map文件中可发现编译器分配各段地址时是以段的字符来排序的.同一段内的数据是以数据定义的顺序来分配。如下：
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LoadSection_Peripher_1$$Base 0x00006ad8 Number 0 main.o(LoadSection_Peripher_1)SysLoad_Peripher1_perFunc2 0x00006ad8 Data 4 main.o(LoadSection_Peripher_1)SysLoad_Peripher1_perFunc3 0x00006adc Data 4 main.o(LoadSection_Peripher_1)SysLoad_Peripher1_perFunc1 0x00006ae0 Data 4 main.o(LoadSection_Peripher_1)LoadSection_Peripher_1$$Limit 0x00006ae4 Number 0 main.o(LoadSection_Peripher_1)LoadSection_Peripher_2$$Base 0x00006ae4 Number 0 main.o(LoadSection_Peripher_2)SysLoad_Peripher2_perFunc2 0x00006ae4 Data 4 main.o(LoadSection_Peripher_2)SysLoad_Peripher2_perFunc3 0x00006ae8 Data 4 main.o(LoadSection_Peripher_2)SysLoad_Peripher2_perFunc1 0x00006aec Data 4 main.o(LoadSection_Peripher_2)LoadSection_Peripher_2$$Limit 0x00006af0 Number 0 main.o(LoadSection_Peripher_2)LoadSection_Peripher_3$$Base 0x00006af0 Number 0 main.o(LoadSection_Peripher_3)SysLoad_Peripher3_perFunc2 0x00006af0 Data 4 main.o(LoadSection_Peripher_3)SysLoad_Peripher3_perFunc3 0x00006af4 Data 4 main.o(LoadSection_Peripher_3)SysLoad_Peripher3_perFunc1 0x00006af8 Data 4 main.o(LoadSection_Peripher_3)LoadSection_Peripher_3$$Limit 0x00006afc Number 0 main.o(LoadSection_Peripher_3)
自动加载或初始化方式如下：
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/* 测试发现如果代码中未定义某个段的话就不能引用连接脚本中的$$Length标识符，编译器会报错。但是可以引用$$Base和$$Limit两个标识符，编译器只会报警忽略两个外部变量。原因不明？？ 但是不有关系，只要有$$Base和$$Limit两个变量就可以定位段的位置和长度了 */extern int LoadSection_Peripher_3$$Base;
extern int LoadSection_Peripher_3$$Limit;
//extern int LoadSection_Peripher_3$$Length;extern int LoadSection_Peripher_2$$Base;
extern int LoadSection_Peripher_2$$Limit;
//extern int LoadSection_Peripher_2$$Length;extern int LoadSection_Peripher_1$$Base;
extern int LoadSection_Peripher_1$$Limit;
//extern int LoadSection_Peripher_1$$Length;{SysLoad_Init_t *pt;base = (uint32_t)(&LoadSection_Peripher_1$$Base);limit = (uint32_t)(&LoadSection_Peripher_1$$Limit);length = (limit - base)/sizeof(SysLoad_Init_t);printk(DBG_LEVEL_INFO, "base1=0x%08x, limit1=0x%08x, length1=0x%08x\r\n", base, limit, length);pt = (SysLoad_Init_t *)base;for(uint32_t i= 0; i < length; i++){pt->init();pt++;}}
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INFO:base1=0x00006a84, limit1=0x00006a90, length1=0x00000003
INFO:fnc2
INFO:fnc3
INFO:fnc1