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版主您好，在PIC18f85j10中使用AD0遇到的一些問題
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新會員
 
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在PIC18F85J10中使用AD0做AD變換，我的程序這樣：
void PortInit(void) { TRISA = 0x1d; TRISB=0xfe; TRISC=0x91; TRISD=0x00; TRISE=0x00; TRISF=0x02; TRISH=0x00; TRISG=0x00; TRISJ=0xf0; } void CVPinit(void) { INTCON=0x20; PIR1=0x13; PIE1=0x23; CMCON=0x07; CVRCON=0x00; ADCON0 = 0x01; ADCON1 = 0x0c; ADCON2 = 0xBE; //40MHZ晶振 } unsigned int FADCDone(void) { unsigned int FADCtemp; FADCdat = 0; ADCON0 = 0x01; ADCON0bits.GO_DONE = 1; while(!PIR1bits.ADIF); PIR1bits.ADIF = 0; ADCON0bits.GO_DONE = 0; FADCtemp = ADRESH; FADCtemp <<= 8; FADCtemp += ADRESL; return FADCtemp; } void main(void) { unsigned int tdata; PortInit(); CVPinit(): tdata= FADCDone(); } AD變換得到的AD值總是一部分值是實際轉換出來的AD值，時不時的冒出一個AD值是0x200，我就不清楚0x200是怎麽得出來的，也不知我這軟件編寫的有什么錯誤？硬件上是采用3.3V基準，多謝大家能够幫幫我啊
發表於: 2007/12/15 8:28
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