DSP程序中定义的数组总报错是怎么回事

登录 · 发表于 2016-3-30 11:29

本帖最后由 zhangchunbuaa 于 2016-3-30 11:32 编辑

float sina[30]={0.000000,0.104528,0.207911,0.309016,0.406737,
0.500000,0.587785,0.669131,0.743145,0.809017,
0.866025,0.913545,0.951057,0.978148,0.994522,
1.000000,0.994522,0.978148,0.951057,0.913545,
0.866025,0.809017,0.743145,0.669131,0.587785,
0.500000, 0.406737,0.309016,0.207911,0.104528};
float sinb[30]={0.866025,0.809017,0.743145,0.669131,0.587785,
0.500000,0.406737,0.309016,0.207911,0.104528,
0.000000,-0.104528,-0.207911,-0.309016,-0.406737,
-0.500000,-0.587785,-0.669131,-0.743145,-0.809017,
-0.866025,-0.913545,-0.951057,-0.978148,-0.994522,
-1.000000,-0.994522,-0.978148,-0.951057,-0.913545};
我在CCS3.3源程序中定义了两个数组，但是总是报错，是怎么回事？
"SPWM2.c", line 70: error: declaration may not appear after executable statement in block
"SPWM2.c", line 76: error: declaration may not appear after executable statement in block

发表于 2016-3-30 11:41

必须先定义，再使用。
不能倒过来。

提示是这么说的。

发表于 2016-3-30 11:52

前面好像有执行语句。。。。。。。。。。。。。。。。。。。。。。。。

发表于 2016-3-30 14:26

后面的程序是这样的，应该怎么改呢？

while(1)
    {
    if((i>=0)&&(i<N/2))
   {
   EPwm1Regs.CMPA.half.CMPA =EPwm1Regs.TBPRD*((1.0+M*sina[i])/2.0);
   EPwm2Regs.CMPA.half.CMPA =EPwm1Regs.TBPRD*((1.0+M*sinb[i])/2.0);  //更新比较寄存器2的值
   EPwm1Regs.CMPA.half.CMPA =EPwm1Regs.TBPRD*((1.0-M*(sina[i]+sinb[i]))/2.0);  //更新比较寄存器3的值
   }
if((i>=N/2)&&(i<N))
   {
   EPwm1Regs.CMPA.half.CMPA =EPwm1Regs.TBPRD*((1.0-M*sina[i-30])/2.0);
   EPwm2Regs.CMPA.half.CMPA =EPwm1Regs.TBPRD*((1.0-M*sinb[i-30])/2.0);  //更新比较寄存器2的值
   EPwm1Regs.CMPA.half.CMPA =EPwm1Regs.TBPRD*((1.0+M*(sina[i-30]+sinb[i-30]))/2.0);  //更新比较寄存器3的值
   }
   i++;
   if(i>=N)i=0;
SPwmSetup();
}

发表于 2016-3-30 22:28

把数组定义在主函数外面就好了，已经解决了

[DSP编程] DSP程序中定义的数组总报错是怎么回事

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