概述
应用中我们经常会用到一些应用场景,如使用Const 关键字定义一个数组到Flash地址单元,但是具体该数组放在Flash的那个位置,通常是由编译器自己分配的(和LCF连接配置文件设置有关),以及定义函数到RAM区域,增快程序代码的执行速度。所以在这些场合我们会去思考如何指定一段数组或者一个函数到特定的Flash,EEPROM或者RAM区间中,下面简单给出几个实例。
1. 指定数组到特定的Flash单元
#pragma location = 0x000FFF00
__root const char Flash_config[] =
{
0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xA,0xB,0xC,0xD,0xE,0xF,
0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,
0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0x2F,
};
执行结果如下:
2.
定位到Flash区域,这个需要两个步骤:
第一步:
在LCF文件分配一段代码;
place at address mem: 0x0001e000 { readonly section .funflash };
第二步:在主函数定义函数;
char Function_Relocted_to_Address(int flag) @".funflash"
{
if (flag > 0)
{
return 1;
}
return 0;
}
}
最后
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