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dsPIC2020 ADC PROPLEMS
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新會員
 
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各位大大 你們好!!
我現在有個dsPIC2020 ADC部分的問題。我有4的外部信號要進dsPIC的 AN0~AN3， 我在程式部分要分別去讀取這四個信號，但是如果只是分別讀AN0和AN1 或者是AN2和AN3 用示波器去看都沒有錯 但是如果要一次讀取這四個信號他就只有轉換AN0和AN1的信號 而AN2和AN3的信號都沒有被轉換。我是採用軟體觸發轉換的方式。謝謝!! 我的ADC暫存器設定如下: void Init_ADC(void) { IEC2bits.ADCP0IE = 0 ; IFS2bits.ADCP0IF = 0 ; ADCON = 0x0023 ; ADPCFG = 0xFFF0 ; ADSTAT = 0x0000 ; ADCPC0 = 0x8181 ; ADCONbits.ADON = 1 ; } 主程式內容如下: int main(void) { TRISE = 0x0000; TRISBbits.TRISB5 = 0; Init_ADC(); while(1) { ADCPC0bits.SWTRG0 = 1 ; ADCPC0bits.SWTRG1 = 1 ; if(!ADCPC0bits.PEND0); ZL1 = ADCBUF0 >> 2 ; IL1 = ADCBUF1 >> 2 ; if(!ADCPC0bits.PEND1) ZC1 = ADCBUF2; ADCPC0bits.SWTRG0 = 1 ; ADCPC0bits.SWTRG1 = 1 ; if(!ADCPC0bits.PEND0); ZL2 = ADCBUF0 >> 2 ; IL2 = ADCBUF1 >> 2 ; if(!ADCPC0bits.PEND1) ZC2 = ADCBUF2; if((ZL1 + ZL2)*0.5 >= 100) LATE = (-1*(IL1 + IL2)*0.5*0.0032258*4*25)+128; else LATE = (1*(IL1 + IL2)*0.5*0.0032258*4*25)+128; if((ZC1-ZC2) >= 100) LATBbits.LATB5 = 1; else LATBbits.LATB5 = 0; } }
發表於: 2009/5/3 23:11
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