解释一下这一段c语言代码while(1) { delay_ms(200); _volt[6]=1.0+(float)RW6/4096*0.07; _volt[2]=_volt[4]=_volt[5]=1.0; _volt[1]=0.97+(float)RW1/4096*(1.1-0.97); SW=sw; _2=(SW>>1)&1;_8=(SW>>7)&1; SW=SW&0x7D; SW=SW|(_2<<7); SW=SW|(_8<<1); page=1&(SW>>7); _volt[3]=_map[(SW&(1<<1))==2][(int)(_volt[6]*100+0.5)-100]; memset(str2,0,sizeof(str2)); sprintf(str2,"%4.2f%4.2f%4.2f%4.2f%4.2f%4.2f",_volt[1],_volt[2],_volt[3],_volt[4],_volt[5],_volt[6]); USART1->DR=0xB0; while((USART1->SR&0X40)==0); for(i=0;i<32;i++) { USART1->DR=str2[i]; while((USART1->SR&0X40)==0); }
时间: 2023-06-07 12:11:28 浏览: 356
这段代码是一个无限循环,在每隔200毫秒的时间后,使用模拟输入读取6路模拟电压分别存入float类型数组_volt的第6个元素,使用模拟输入读取1路模拟电压存入_volt数组的第1个元素,同时进行一系列位运算操作,将SW右移1位,再用_2存储结果。其中RW1和RW6是模拟输入的数据,4096是模拟输入的最大数据值,0.07和1.1-0.97是电阻和放大器的系数。整个代码的作用是读取模拟输入数据并进行一定程度的处理。
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解释一下这段代码: userNtcData.voltage[userNtcData.index++] = volt;
这段代码的作用是将变量 "volt" 的值赋给 "userNtcData.voltage" 数组的第 "userNtcData.index" 个元素。在这里,"userNtcData.index" 是数组中待赋值元素的下标。
double calculateFrequency_byFFT(ARRAY_I &cap_data, double sample_period_us) { ARRAY_D spect; int min_index, max_index; double min, max, dR, interpol_index, frequency_MHz; DSP_SPECTRUM(cap_data, spect, VOLT, 1.0, HANNING, 0); if(spect.size()>2) { spect[0]=0; spect[1]=0; } else { cerr<<"WARNING: spectrum data is too small."<<endl; } DSP_MINMAX(spect, &min, &max, &min_index, &max_index); int max_index_plus_one = max_index + 1; max_index_plus_one = (max_index_plus_one < spect.size())? max_index_plus_one : max_index_plus_one-1; if((max_index > 0)&&(spect[max_index - 1]>spect[max_index_plus_one])) { dR = spect[max_index - 1] / spect[max_index]; interpol_index = max_index + (1.0 - 2.0 * dR) / (1.0 + dR); } else { dR = spect[max_index_plus_one] / spect[max_index]; interpol_index = max_index - (1.0 - 2.0 * dR) / (1.0 + dR); } frequency_MHz = interpol_index/(sample_period_us*cap_data.size()); return frequency_MHz; }
这是一个使用FFT计算频率的函数,输入参数是一个整型数组cap_data和采样周期sample_period_us,输出结果是一个double类型的频率值frequency_MHz。首先使用DSP_SPECTRUM函数计算cap_data的频谱,然后使用DSP_MINMAX函数找出频谱中最大值的索引max_index和最小值的索引min_index,接着进行插值计算得到峰值点的精确位置interpol_index,最后将interpol_index除以采样周期和数组长度即可得到频率值frequency_MHz。
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