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Re: A/D轉換問題
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版主
 
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如果 "ADCBUF0的值都一直是E1CD " 的話，那代表什麼問題? 很明顯的 ADC 的轉換有問題。
所以先將 ADC 的轉換搞定後再來試驗 PWM 。 http://www.microchip.com.tw/modules/w ... glefile.php?cid=4&lid=229 這裡有 ADC 設定的說明與範例。(dsPIC30F4011)
發表於: 2009/10/8 9:45
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A/D轉換問題
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新會員
 
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請各位先進幫我看看程式
快瘋了= = 我想寫出一個可輸入0~5V然後改變PWM輸出的程式 可我ad轉換一直出問題 我Tcy=33ns A/D速度是500ksps Tad=165ns 取樣時間為1Tad AN3為輸入 程式如下; #include <p30f4011.h> #include <pwm.h> #define FCY 7372800*2 #define PWM_PTPER 450 //int PWM_PTPER = 450; #define timerPR1 500 _FOSC(CSW_FSCM_OFF & XT_PLL8); //XT with 8xPLL oscillator, Failsafe clock offIRRtO _FWDT(WDT_OFF); //Watchdog timer disabledk- _FBORPOR(PBOR_OFF & MCLR_EN); //Brown-out reset disabled, MCLR reset enabledj{g _FGS(CODE_PROT_OFF); //Code protect disabledw9w/ int ADCbuff = 1024; void Init_MCPWM(void); void initalADC12(void); void main() { initalADC12(); Init_MCPWM(); while(1) { while( ADCON1bits.DONE ); ADCON1bits.DONE = 0; ADCbuff = ADCBUF0; PDC1 = 2*PTPER*ADCBUF0; //2^10=0x0400 } return 0; } void initalADC12(void) { IFS0bits.ADIF = 0; IEC0bits.ADIE = 0; ADCON1bits.ADON = 0; ADPCFG = 0xFFF7; ADCHS = 0x0003; ADCON1 = 0x03E4; ADCON2 = 0x0000; ADCON3 = 0x0189; ADCSSL = 0x0000; ADCON1bits.ADON = 1; } 可我無論怎麼改輸入電壓 PWM依舊不會變 ADCBUF0的值都一直是E1CD 是不是我程式有哪寫錯@@
發表於: 2009/10/7 15:43
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