Using ADC to control brushless motor source program STM32 library function

Statement Personal learning content For reference only

STM32f103c8t6 Minimum system Rocker potentiometer No brush motor Electrical regulation

 

PWM Initialization function  

void pwm_init()
{
	GPIO_InitTypeDef GPIO_InitStructure;   //ÉùÃ÷Ò»¸ö½á¹¹Ìå±äÁ¿£¬ÓÃÀ´³õʼ»¯GPIO

	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;//ÉùÃ÷Ò»¸ö½á¹¹Ìå±äÁ¿£¬ÓÃÀ´³õʼ»¯¶¨Ê±Æ÷

	TIM_OCInitTypeDef TIM_OCInitStructure;//¸ù¾ÝTIM_OCInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèTIMx

	/* ¿ªÆôʱÖÓ */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

	/*  ÅäÖÃGPIOµÄģʽºÍIO¿Ú */
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//¸´ÓÃÍÆÍìÊä³ö
	GPIO_Init(GPIOA,&GPIO_InitStructure);


	//TIM3¶¨Ê±Æ÷³õʼ»¯
	TIM_TimeBaseInitStructure.TIM_Period = 1439;	   //²»·ÖƵ,PWM ƵÂÊ=72000/900=8Khz//ÉèÖÃ×Ô¶¯ÖØ×°ÔؼĴæÆ÷ÖÜÆÚµÄÖµ 5Khz
	TIM_TimeBaseInitStructure.TIM_Prescaler = 99;//ÉèÖÃÓÃÀ´×÷ΪTIMxʱÖÓƵÂÊÔ¤·ÖƵֵ£¬100Khz¼ÆÊýƵÂÊ
	TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;//ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Down;	//TIMÏòÉϼÆÊýģʽ
	TIM_TimeBaseInit(TIM3, & TIM_TimeBaseInitStructure);

	//GPIO_PinRemapConfig(GPIO_FullRemap_TIM3,ENABLE);//¸Ä±äÖ¸¶¨¹Ü½ÅµÄÓ³Éä	//pC7

	//PWM³õʼ»¯	  //¸ù¾ÝTIM_OCInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèTIMx
	TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//PWMÊä³öʹÄÜ
	TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;

	TIM_OC2Init(TIM3,&TIM_OCInitStructure);
	//×¢Òâ´Ë´¦³õʼ»¯Ê±TIM_OC2Init¶ø²»ÊÇTIM_OCInit£¬·ñÔò»á³ö´í¡£ÒòΪ¹Ì¼þ¿âµÄ°æ±¾²»Ò»Ñù¡£

	TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);//ʹÄÜ»òÕßʧÄÜTIMxÔÚCCR2ÉϵÄԤװÔؼĴæÆ÷
	
	TIM_Cmd(TIM3,ENABLE);//ʹÄÜ»òÕßʧÄÜTIMxÍâÉè
}

obtain 500HZ pwm The signal

ADC initialization

void adc_init()
{
	GPIO_InitTypeDef GPIO_InitStructure;
	ADC_InitTypeDef ADC_InitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO|RCC_APB2Periph_ADC1,ENABLE);

	RCC_ADCCLKConfig(RCC_PCLK2_Div6);//12M  ×î´ó14M ÉèÖÃADCʱÖÓ£¨ADCCLK£

	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;//ADC
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;	//Ä£ÄâÊäÈë
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStructure);


	ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; 
	ADC_InitStructure.ADC_ScanConvMode = DISABLE; 
	ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; 
	ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; 
	ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; 
	ADC_InitStructure.ADC_NbrOfChannel = 1; 
	ADC_Init(ADC1, &ADC_InitStructure);
	
	//ÉèÖÃÖ¸¶¨ADCµÄ¹æÔò×éͨµÀ£¬ÉèÖÃËüÃǵÄת»¯Ë³ÐòºÍ²ÉÑùʱ¼ä
	ADC_RegularChannelConfig(ADC1,ADC_Channel_1,1,ADC_SampleTime_239Cycles5);
	
	ADC_Cmd(ADC1,ENABLE);	

	ADC_ResetCalibration(ADC1);//ÖØÖÃÖ¸¶¨µÄADCµÄУ׼¼Ä´æÆ÷
	while(ADC_GetResetCalibrationStatus(ADC1));//»ñÈ¡ADCÖØÖÃУ׼¼Ä´æÆ÷µÄ״̬
	
	ADC_StartCalibration(ADC1);//¿ªÊ¼Ö¸¶¨ADCµÄУ׼״̬
	while(ADC_GetCalibrationStatus(ADC1));//»ñÈ¡Ö¸¶¨ADCµÄУ׼³ÌÐò

	ADC_SoftwareStartConvCmd(ADC1, ENABLE);//ʹÄÜ»òÕßʧÄÜÖ¸¶¨µÄADCµÄÈí¼þת»»Æô¶¯¹¦ÄÜ

}

The main function

#include "stm32f10x.h"
#include "adc.h"
#include "pwm.h"
int main(void)
{
	u32 ad=0;
	u8 i;
	adc_init();	 //ADC³õʼ»¯
	pwm_init();
//	printf_init(); //printf³õʼ»¯
	while(1)
	{
		ad=0;     
		for(i=0;i<50;i++)//¶ÁÈ¡50´ÎµÄADÊýֵȡÆäƽ¾ùÊý½ÏΪ׼ȷ	
		{
			ADC_SoftwareStartConvCmd(ADC1, ENABLE);
			while(!ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));//ת»»½áÊø±ê־λ
			ad=ad+ADC_GetConversionValue(ADC1);//·µ»Ø×î½üÒ»´ÎADCx¹æÔò×éµÄת»»½á¹û		
		}
		ad=ad/50;
		TIM_SetCompare2(TIM3, ad*1439/4096);
//		printf("ad=%fV\n",ad*3.3/4096);
//		delay_ms(1000);			
	}			

}

Be careful Range shall be set for the first use of electric regulation