用于STC單片機內置10位AD轉換的代碼+【軟件濾波】

GetResult()這個(gè)是軟件濾波的，10位AD的之前弄濾波總出錯，今天剛弄好。
關(guān)鍵在于(unsigned long)(),不加這個(gè)就總出錯！計算過(guò)程中溢出，感覺(jué)好像是計算時(shí)自動(dòng)降位了

ulong GetADCResult(uchar ch){ulong AD_result;ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ch | ADC_START;_nop_();                        //Must wait before inquiry_nop_();_nop_();_nop_();while (!(ADC_CONTR & ADC_FLAG));//Wait complete flagADC_CONTR &= ~ADC_FLAG;         //Close ADCAD_result=ADC_RES*4+ADC_RESL; return   AD_result;             //Return ADC result 10bit}ulong GetResult(uchar ch)  //濾波段{ulong AD_result=0,AD_result1=0;ulong AD_max,AD_min,AD_temp;char AD_i,AD_o;for(AD_i=0;AD_i<4;AD_i++){AD_min=AD_max=GetADCResult(ch);AD_result=0;for(AD_o=0;AD_o<8;AD_o++){AD_temp=GetADCResult(ch);if(AD_tempAD_max){AD_result =(unsigned long)(AD_result + (unsigned long)AD_max); AD_max=AD_temp;}else AD_result =(unsigned long)(AD_result + (unsigned long)AD_temp);}AD_result=(unsigned long)(AD_result/8);AD_result1=AD_result1+ (unsigned long)(AD_result); }AD_result1=(unsigned long)(AD_result1/4);return   AD_result;             //Return ADC result 10bit}

方法是基于：去除最大最小值后平均。共采樣了33次去掉9個(gè)后的結果平均值，我自己做電壓表，速度足夠！如果嫌慢的話(huà)可以把AD_i<4中的這個(gè)4改小點(diǎn)或者把這個(gè)循環(huán)去掉。