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我不知道如何为我的大学项目正确设置 AD 转换器。我应该使用 TRGO 来触发转换，我正在尝试使用 TIM3 来实现。每次我调用 ADC_Init 我都会得到结果，但它会根据与它无关的 PWM 信号而有所不同，我试图根据 ADC 的测量来改变 PWM 信号的 CCR。有关如何正确执行此操作的任何帮助？谢谢！

#include <stdio.h>

#include “stm32f103x6.h”

易失性 int adc_dr;

void ADC_General_Init(ADC_TypeDef *  ADCx){

ADCx->CR2 |= ADC_CR2_ADON; // ukljucivanje ADC (izlazak iz rezima power-down) - ADON set
delay(20);

//kalibracija
ADCx->CR2 |= ADC_CR2_CAL;
while ((ADCx->CR2 & ADC_CR2_CAL)==ADC_CR2_CAL);

// iskljucivanje ADC dok se ne podese svi parametri (usteda energije) - ADON reset
ADCx->CR2 &= ~ADC_CR2_ADON;

ADCx->CR2 &= ~ADC_CR2_CONT; // CONT = 0: Single conversion mode - jedna konverzija

// ukljucivanje internog temperaturnog senzora i referentnog napona (strana 235)
ADCx->CR2 |= ADC_CR2_TSVREFE; // TSVREFE bit mpra biti setovan da dozvoli oba interna kanala: ADCx_IN16 (temperature sensor) and ADCx_IN17 (VREFINT) conversion.

// podesavanje konverzije jednog kanala u regularnoj grupi (strana 247)
ADCx->SQR1 &= ~ADC_SQR1_L;   // setovanje bitova L[3:0]=0000: 1 konverzija, ADC_SQR1

// odredjivanje kanala 1 (Channel 1) za (prvu) konverziju u regularnoj grupi (strana 249)
ADCx->SQR3 &= ~ADC_SQR3_SQ1; // brisanje bitova
ADCx->SQR3 |= (1U << ADC_SQR3_SQ1_Pos); // setovanje bitova SQ1[4:0] u ADC_SQR3 registru - SQ1 = Channel 1; prvi kanal je u trecem registru
//"Pos" kaze da upisujem 1 (ovde) u bit (pozicija) gde pocinje SQ1 - bit 0;
//Bits 4:0 SQ1[4:0]: first conversion in regular sequence

// hardversko okidanje konverzije (strana 241)
ADCx->CR2 &= ~ADC_CR2_EXTSEL;
ADCx->CR2 |= (0b100U << ADC_CR2_EXTSEL_Pos); // EXTSEL[2:0] = 100: Timer 3 TRGO event
/*----------------ili----------------------
ADC1 -> CR2 &= ~ADC_CR2_EXTSEL;
ADC1 -> CR2 |= ADC_CR2_EXTSEL_2;
---------------------------------------------*/
ADC1 -> CR2 |= ADC_CR2_EXTTRIG; // 1: Conversion on external event enabled (strana 241)

ADCx->CR2 |= ADC_CR2_ADON;// ukljucivanje ADC

}

void ADC_GPIO_Init(void) {

RCC->APB2ENR |=  RCC_APB2ENR_IOPAEN; // uključivanje takta za GPIO Port A

// strana 26 u STM32F103_Datasheet.pdf

GPIOA->CRL &= ~(GPIO_CRL_MODE1 | GPIO_CRL_CNF1); // brisanje podešavanja za PA6
GPIOA->CRL |= (GPIO_CRL_MODE1_0 | GPIO_CRL_CNF1_0);  //input mode - 00: Analog mode

}

void ADC_Init(void) {

RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;  // ukljucivanje ADC1 clock-a

ADC_GPIO_Init();
ADC_General_Init(ADC1);

ADC1->CR1 |= ADC_CR1_EOCIE; // omogucivanje prekida (strana 240)
// postavlja se signal EOC: End of conversion

NVIC_SetPriority(ADC1_IRQn, 1); // dodela prioriteta na 1
//NVIC->ISER[0] |= NVIC_ISER_SETENA_18;
//NVIC_EnableIRQ(ADC1_2_IRQn);      // drugi nacin
NVIC_EnableIRQ(ADC1_IRQn);          // dozvola prekida ADC 1 & 2 - ista prekidna rutina broj 18 (strana 199)

}

void ADC1_2_IRQHandler(void) {

uint16_t statReg = (ADC1->SR & 0xFFFFU); // citanje statusnog registra
if ((statReg & ADC_SR_EOC) == ADC_SR_EOC) {

    adc_dr = (ADC1 -> DR & 0xFFFFU); //cuvamo vrednost data registra u neku promenljivu

    //TIM2->CCR4 = adc_dr/10; // treba menjati ovo deljenje
    // delimo kako bismo dobili srazmernu promenu
    delay(10);
    ispisbroja(adc_dr);
    delay(1000);
    if(adc_dr <=1045){
        TIM2->CCR4 = 999;
        //ispisbroja(TIM2->CCR4);
    }
    else if( adc_dr >= 1084){
        TIM2->CCR4 = 0;
        //ispisbroja(TIM2->CCR4);
    }
    else{
        TIM2->CCR4 = (int)999-(adc_dr-1045)*27,75;
        //ispisbroja(TIM2->CCR4);
    }
}

}

无效 TIM3_IRQHandler(无效){

    ADC_Init();

    TIM3 -> SR &= ~TIM_SR_UIF;

}

void adtim1(void){
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN; // Enable the peripheral clock of GPIO Port A
// Hocemo da koristimo tajmer TIM3, u rezimu Toggle Output


//TIM2->CR1 &= ~TIM_CR1_CEN;
// Enable timer 2 clock
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;

//  Counting direction: 0 = up-counting, 1 = down-counting
//TIM2->CR1 &= ~TIM_CR1_DIR;

TIM3->CR2 &= ~TIM_CR2_MMS;  // brisanje master mode selection bitova
TIM3->CR2 |= TIM_CR2_MMS_2; // setovanje OC1REF as trigger output TRGO (OC1REF=100)

// Clock prescaler (16 bits, up to 65,535)
TIM3->PSC = 7999;

//Auto-reload: up-counting (0-->ARR), down-counting (ARR-->e
TIM3->ARR = 2000;

//Upisujemo vrednost u Capture/Compare Register 1 i time podesavamo sirinu impulsa,
// tj. izlaz ce biti 1, dok je vrednost brojaca manja od vrednosti u CCR4
TIM3->CCR2 = 50;

//TIM2->CCR3 = 90;


// Output compare se podešava u registru TIMx_CCMR1 - Capture/Compare Mode Register (za kanale 1 i 2), ili TIMx_CCMR2 (za kanale 3 i 4)
// Polje OC3M[2:0], 011: Toggle - OC4REF toggles when TIMx_CNT=TIMx_CCR4.
TIM3->CCMR1 &= ~TIM_CCMR1_OC2M; // Prvo brisemo bitove za to polje

TIM3->CCMR1 |= (0b110 << TIM_CCMR1_OC2M_Pos); // Upisujemo vrednost 011 od pozicije na kojoj pocinje polje TIM_CCMR2_OC4M

//TIM3->CCMR1 |= 0b01 << TIM_CCMR1_CC2S_Pos;
//TIM3->CCMR2 &= ~TIM_CCMR2_OC4PE;

// Select output polarity: 0 = active high, 1 = active Low
TIM3->CCER &= ~TIM_CCER_CC2P; //OC4 active high

TIM3->CCER |= TIM_CCER_CC2P;

// Enable output for channel 1 , CC4E: Capture/Compare 1 output enable
TIM3->CCER |= TIM_CCER_CC2E; // 1: On - OC4 signal is output on the corresponding output pin.

//TIM3->SMCR |= 0b110 << TIM_SMCR_SMS_Pos;

//TIM3->SMCR |= 0b110 << TIM_SMCR_TS_Pos;

/* TIM2->CCMR2 &= ~TIM_CCMR2_OC3M; // 卡纳尔 3

TIM2->CCMR2 |= (0b011 << TIM_CCMR2_OC3M_Pos); // Upisujemo vrednost 011 od pozicije na kojoj pocinje polje TIM_CCMR2_OC4M

TIM2->CCMR2 &= ~TIM_CCMR2_OC3PE;

// Select output polarity: 0 = active high, 1 = active Low
TIM2->CCER &= ~TIM_CCER_CC3P; //OC4 active high

// Enable output for channel 1 , CC4E: Capture/Compare 1 output enable
TIM2->CCER |= TIM_CCER_CC3E; // 1: On - OC4 signal is output on the corresponding output pin.  KANAL 3

*/

//  Enable timer 2
//TIM2->CR1 |= (0b01 << TIM_CR1_CMS_Pos);
TIM3->CR1 &= ~TIM_CR1_ARPE;


TIM3->CR1 |= TIM_CR1_CEN;

TIM3->DIER |=TIM_DIER_UIE; //Update Interrupt Enable
TIM3 -> SR &= ~TIM_SR_UIF; //Update Interrupt Flag
//TIM3->DIER |=TIM_DIER_TIE; //Update Interrupt Enable
//TIM3 -> SR &= ~TIM_SR_TIF; //Update Interrupt Flag
NVIC_EnableIRQ(TIM3_IRQn); //Interrupt Set-Enable Register
__enable_irq();  //Enable Interrupt

}

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