你好,
程式中因為在 Timer2 中斷不斷的叫用 Read_VR2() , Show_ADC 以及更新 OCR1. 所以當然停不住啦.

void _ISR _T2Interrupt(void)
{
OC1RS=Read_VR2( );
Show_ADC( ) ; // 將類比轉換結果顯示
OC1R = ADCBUF0<<6 ;
// SetPulseOC1(ADCBUF0<<6, 0x0000) ; // 重新設定OC1波寬

LED1=!LED1;
IFS0bits.T2IF = 0 ;

}

在 main() 中, 程式的最後為 while(1); 你可以將 _T2Interrupt()的動作剪下然後貼到 main() 的最後 .

>> 原本為 while(1) ;
>> 改為
while(1)
{
while( SWn_Status ) ;

OC1RS=Read_VR2( );
Show_ADC( ) ; // 將類比轉換結果顯示
OC1R = ADCBUF0<<6 ;

}
>> 如此就可以按一次鍵就只送一次 , 但你要自己定義 SWn_Status 到底指向哪一個 Input 腳, 而且沒按鍵的話是被 pill-high 的 :)

祝你順利 !!

各位高手您好：
小弟目前使用APP020(MCU為DSPIC30F4011)這塊實驗版上之可變電阻VR2調變PWM訊號之DUTY，而當按下電腦鍵盤上任何一個鍵時便可將VR2上之電壓值顯示電腦上之超級終端機，目前利用VR2改變PWM訊號DUTY之動作OK，但是只要當我ㄧRUN程式時，VR2之電壓值便不斷的顯示於超級終端機上(不斷自動換行顯示VR2之數值)，而調整VR2時於終端機上芝VR2會改變，但一樣會不斷重複換行顯示VR2數值，想請問各位高手，是否有辦法當我按下鍵盤時才讓終端機顯示VR2數值一次，而不是一直自動重複顯示而不受鍵盤控制。以下是我的程式內容(有點冗長，還麻煩各位幫我看一下)，是否是因為ADC或UART未設定好呢??我已經困擾許久了，拜託各位協助了!!

#include <p30fxxxx.h>
#include <adc10.h> // 將adc10函式的原型宣告檔案含入
#include <timer.h> // 將Timer函式的原型宣告檔案含入
#include <uart.h>
#include <outcompare.h> // 將Compare函式的原型宣告檔案含入

#define FCY 7372800 * 2 // 因為使用頻率為將外部 7.3728 MHz * 8 的模式 , 每一指令週期需 4 個 clock
// 所以 FCY = (7.3728 * 8 / 4 ) MHz = 7372800* 2

_FOSC(CSW_FSCM_OFF & XT_PLL8); // XT with 8xPLL oscillator, Failsafe clock off
_FWDT(WDT_OFF); // Watchdog timer disabled
_FBORPOR(PBOR_OFF & MCLR_EN); // Brown-out reset disabled, MCLR reset enabled
_FGS(CODE_PROT_OFF); // Code protect disabled

const char My_String1[]="\r\nExercise 13 - OC\r\n" ;

#define LED1 LATEbits.LATE0
#define CTRL_LED1 TRISEbits.TRISE0

void Init_ADC(void) ;
void Init_Timer2(void);
void Init_UART(void) ;
void Show_ADC(void) ;
unsigned int Read_VR2(void);
void Init_OC1(void) ;

void _ISR _T2Interrupt(void)
{
OC1RS=Read_VR2( );
Show_ADC( ) ; // 將類比轉換結果顯示
OC1R = ADCBUF0<<6 ;
// SetPulseOC1(ADCBUF0<<6, 0x0000) ; // 重新設定OC1波寬

LED1=!LED1;
IFS0bits.T2IF = 0 ;

}

int main( void )
{
SRbits.IPL=4;

Init_ADC( ) ; // 將ADC進行初始化設定
Init_UART( ) ; // 對 UART 模組作初始化設定

putsUART1( (unsigned int *) My_String1 ) ;
Init_Timer2( );
Init_OC1();
TRISDbits.TRISD0=0;
CTRL_LED1 = 0 ;

while(1);
}

/***********************************************/
// Subroutine to configure the OC module

void Init_OC1(void)
{
CloseOC1();

ConfigIntOC1(OC_INT_OFF & OC_INT_PRIOR_7);
// IEC0bits.OC1IE = 0 ;
// IFS0bits.OC1IF = 0 ;
// IPC0bits.OC1IP = 7 ;

OpenOC1(OC_IDLE_CON & OC_TIMER2_SRC &
OC_PWM_FAULT_PIN_DISABLE, 0, 0);
// OC1CON= 0x0006;
}

/***********************************************/
// Subroutine to configure the A/D module

void Init_ADC(void)
{

unsigned int Channel, PinConfig, Scanselect, Adcon3_reg, Adcon2_reg, Adcon1_reg;

ADCON1bits.ADON = 0; /* turn off ADC */

PinConfig = ENABLE_AN0_ANA; // Select port pins as analog inputs ADPCFG<15:0>

Adcon1_reg = ADC_MODULE_ON & // Turn on A/D module (ADON)
ADC_IDLE_STOP & // ADC turned off during idle (ADSIDL)
ADC_FORMAT_INTG & // Output in integer format (FORM)
ADC_CLK_MANUAL & // Conversion trigger manually (SSRC)
ADC_SAMPLE_INDIVIDUAL & // Sample channels individually (SIMSAM)
ADC_AUTO_SAMPLING_OFF; // Sample trigger manually (ASAM)

Adcon2_reg = ADC_VREF_AVDD_AVSS & // Voltage reference : +AVdd, -AVss (VCFG)
ADC_SCAN_OFF & // Scan off (CSCNA)
ADC_ALT_BUF_OFF & // Use fixed buffer (BUFM)
ADC_ALT_INPUT_OFF & // Does not alternate between MUX A & MUX B (ALTS)
ADC_CONVERT_CH0 & // Convert only channel 0 (CHPS)
ADC_SAMPLES_PER_INT_1; // 1 sample between interrupt (SMPI)

Adcon3_reg = ADC_SAMPLE_TIME_10 & // Auto-Sample time (SAMC)
ADC_CONV_CLK_SYSTEM & // Use system clock (ADRC)
ADC_CONV_CLK_4Tcy; // Conversion clock = 4 Tcy (ADCS)
// ADCS = 2*(154ns)/(1/Fcy)-1 = 3.5416

Scanselect = SCAN_NONE; // ADC scan no channel (ADCSSL)

OpenADC10(Adcon1_reg, Adcon2_reg, Adcon3_reg, PinConfig, Scanselect);

Channel = ADC_CH0_POS_SAMPLEA_AN0 & // CH0 Pos. : AN0, Neg. : Nominal Vref- Defined in ADCON2
ADC_CH0_NEG_SAMPLEA_NVREF ; // (ADCHS)
SetChanADC10(Channel);

ConfigIntADC10(ADC_INT_DISABLE); // Disable ADC interrupt

}

/***********************************************/
// Subroutine to configure the Timer 2

void Init_Timer2(void)
{
ConfigIntTimer2( T2_INT_PRIOR_6 & T2_INT_ON ) ; // Timer2 的中斷優先等級設 6
// Timer2 的中斷 OFF

OpenTimer2( T2_ON & T2_IDLE_STOP & T2_GATE_OFF & // Timer2 的 Period 設為每 64ms
T2_PS_1_1 & T2_32BIT_MODE_OFF &
T2_SOURCE_INT,
1023) ;
}
/***********************************************/
// Subroutine to read analog voltage from VR2

unsigned int Read_VR2(void)
{
unsigned char Loop ;

ADCON1bits.SAMP = 1; // start sampling ...

for ( Loop = 0 ; Loop < 100 ; Loop ++ );

ConvertADC10();
while (BusyADC10()); // conversion done?
return ADCBUF0 ; // get ADC value
}

/***********************************************/
// Subroutine to initialize UART module

void Init_UART(void)
{
/* Holds the value of baud register */
unsigned int baudvalue;
/* Holds the value of uart config reg */
unsigned int U1MODEvalue;
/* Holds the information regarding uart
TX & RX interrupt modes */
unsigned int U1STAvalue;
/* Turn off UART1module */
CloseUART1();
/* Configure uart1 receive and transmit interrupt */
ConfigIntUART1(UART_RX_INT_EN & UART_RX_INT_PR6 &
UART_TX_INT_DIS & UART_TX_INT_PR2);
/* Setup the Buad Rate Generator */
baudvalue = 95; //UxBRG = ( (FCY/Desired Baud Rate)/16) – 1
//UxBRG = ( (7372800*2/9600)/16-1) = 95
/* Configure UART1 module to transmit 8 bit data with one stopbit.
Also Enable loopback mode */
U1MODEvalue = UART_EN & UART_IDLE_CON &
UART_DIS_WAKE & UART_DIS_LOOPBACK &
UART_DIS_ABAUD & UART_NO_PAR_8BIT &
UART_1STOPBIT;
U1STAvalue = UART_INT_TX_BUF_EMPTY &
UART_TX_PIN_NORMAL &
UART_TX_ENABLE & UART_INT_RX_CHAR &
UART_ADR_DETECT_DIS &
UART_RX_OVERRUN_CLEAR;
OpenUART1(U1MODEvalue, U1STAvalue, baudvalue);

return;

}

/***********************************************/
// Subroutine to show ADC on UART

void Show_ADC(void)
{
unsigned char Loop ;
unsigned int ADCValue;
unsigned char TXdata[4];
ADCON1bits.SAMP = 1; // start sampling ...

for ( Loop = 0 ; Loop < 100 ; Loop ++ );

ConvertADC10();
while (BusyADC10()); // conversion done?
ADCValue = (ADCBUF0 >> 2); // get ADC value

sitoa(ADCValue, (unsigned char *)TXdata);

putsUART1( (unsigned int *) "VR2 : ");
putsUART1( (unsigned int *) TXdata ) ;
putsUART1( (unsigned int *) "\r\n" );

}

//***********************************************
// Put a unsigned byte in decimal format
// to UART Module

void sitoa( unsigned char The_Number, unsigned char *buff)
{

unsigned char Temp_Char_100, Temp_Char_10, Temp_Char ;
unsigned char *temp = (unsigned char *)buff ;

Temp_Char_100 = The_Number /100 ; //取百位數的數字
temp[0] = Temp_Char_100 + '0' ; //取百位數的數字
Temp_Char_10 = (The_Number - Temp_Char_100*100) /10 ; //取十位數的數字
temp[1] = Temp_Char_10 + '0' ; //取十位數的數字
Temp_Char = The_Number - ( Temp_Char_100*100 + Temp_Char_10 * 10 ) ; //取個位數的數字
temp[2] = Temp_Char + '0' ; //取個位數的數字
temp[3] = 0 ;
}