电子技术论坛_中国专业的电子工程师学习交流社区-中电网技术论坛

标题: [LPC] 用MDK调试lpc3250程序简单数组复制遇到的奇怪状况 [打印本页]

作者: cuicaifeng 时间: 2013-10-17 11:15 标题: [LPC] 用MDK调试lpc3250程序简单数组复制遇到的奇怪状况

数组定义
UNS_8 s[32] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32};
UNS_8 d[32] = {0};

数组复制程序
void copyArray(UNS_8* pA,UNS_8 * pB, UNS_32 num)
{
      while(num > 0)
      {
            *pB = *pA;
            pB++;
            pA++;
            num--;
}
}

调用
copyArray(s,d,32);

反汇编代码
650: void copyArray(UNS_8* pA,UNS_8 * pB, UNS_32 num)
651: {
0x80004B74  E12FFF1E  BX    R14
652:       while(num > 0)
653:       {
0x80004B78  EA000004  B       0x80004B90
654:             *pB = *pA;
0x80004B7C  E5D03000  LDRB    R3,[R0]
0x80004B80  E5C13000  STRB    R3,[R1]
655:             pB++;
0x80004B84  E2811001  ADD    R1,R1,#0x00000001
656:             pA++;
0x80004B88  E2800001  ADD    R0,R0,#0x00000001
657:             num--;
658: }
0x80004B8C  E2422001  SUB    R2,R2,#0x00000001
0x80004B90  E3520000  CMP    R2,#output(0x00000000)
0x80004B94  1AFFFFF8  BNE    0x80004B7C
659: }

结果
d[32] = {0x01,0x02,0x02,0x04,0x03,0x06,0x04,0x08,0x05,0x0A,0x06,0x0C,0x07,0x0E,0x08,0x10,0x09,0x12,0x0A,0x14,0x0B,0x16,0x0C,0x18,0x0D,0x1A,0x0E,0x1C,0x0F,0x1E,0x10,0x20};

作者: baikeeditor 时间: 2013-11-22 13:50

volatile UNS_8 s;
volatile UNS_8 d;

试试

欢迎光临电子技术论坛_中国专业的电子工程师学习交流社区-中电网技术论坛 (http://bbs.eccn.com/)