請問STM32F103如何使用TIMER2觸發??

hunkchen2000 · 发表于 2022-3-25 17:53:19

請問各位，我使用正點原子STMF103的開發板我利用Timer3弄成PWM四個通道的輸出,使用軟體
觸發方式ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
利用PA.1外接可變電阻，調整可變電阻可以改變PWM的空佔比,到目前都沒有問題

那請問,假如我不使用軟體觸發,也不使用DMA,我想要用成TIMER2外部觸發方式.就是我調整
我的PA.1可變電阻的時候他才會觸發,請問這應該要怎麼做，因為目前軟體觸發的方式
好像比較耗電,就是時時刻刻都在抓電阻值.
請問有現成的範例可以給我參考嗎???

#include "adc.h"
#include "delay.h"
#include "timer.h"
#include "lcd.h"
#include "stm32f10x_it.h"
#define LED0 PBout(5)// PB5
#define LED1 PEout(5)// PE5
//////////////////////////////////////////////////////////////////////////////////
//￥»μ{§Ç￥u¨Ñ¾Ç2ß¨Ï￥Î¡A￥¼¸g§@aì3\￥i¡A¤￡±o￥Î©ó¨ä￥|￥ô|ó￥Î3~
//ALIENTEK¾ÔÄ￥STM32¶}μoaO
//ADC ￥N½X
//￥¿ÂI-ì¤l@ALIENTEK
//§T3N½×¾Â:www.openedv.com
//-×§ï¤é′á:2012/9/7
//a©￥»¡GV1.0
//a©Åv©ò|3¡Aμsa©￥2¨s¡C
//Copyright(C) ¼s|{￥«&#172

ál1q¤l¬ì§T|3--¤½￥q 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////


//aì©l¤ÆADC
//3o¸ì§ú-ì¶è￥H3W«h3q1D¬°¨ò
//§ú-ìàq»{±N¶}±ò3q1D0~3
void  Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE );    //¨ÏˉàADC13q1D®éÄá
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //3]¸mADC¤ààW|]¤l6 72M/6=12,ADC3ì¤j®é¶¡¤￡ˉà¶W1L14M

//PA1 §@¬°¼òàà3q1D¿é¤J¤T¸}
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //¼òàà¿é¤J¤T¸}
GPIO_Init(GPIOA, &GPIO_InitStructure);

ADC_DeInit(ADC1);  //′_|ìADC1

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC¤u§@¼ò|¡:ADC1©MADC2¤u§@|b¿W￥ß¼ò|¡
ADC_InitStructure.ADC_ScanConvMode = ENABLE; //¼ò¼ÆÂà′«¤u§@|b3æ3q1D¼ò|¡
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //¼ò¼ÆÂà′«¤u§@|b3æ|¸Âà′«¼ò|¡
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //Âà′«￥Ñ3n￥ó|ó¤￡¬O￥~3¡Ä2μo±ò°ê
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC¼Æ¾ú￥k1ï»ô
ADC_InitStructure.ADC_NbrOfChannel = 1; //¶¶§Ç¶i|æ3W«hÂà′«aoADC3q1Dao¼Æ￥Ø
ADC_Init(ADC1, &ADC_InitStructure); //®ú¾úADC_InitStruct¤¤«ü©wao°Ñ¼Æaì©l¤Æ￥~3]ADCxao±H|s¾1

ADC_Cmd(ADC1, ENABLE); //¨Ïˉà«ü©waoADC1

ADC_ResetCalibration(ADC1); //¨Ïˉà′_|ì®Õ·Ç

while(ADC_GetResetCalibrationStatus(ADC1)); //μ￥«Y′_|ì®Õ·Çμ2§ô

ADC_StartCalibration(ADC1);    //¶}±òAD®Õ·Ç

while(ADC_GetCalibrationStatus(ADC1));    //μ￥«Y®Õ·Çμ2§ô

ADC_SoftwareStartConvCmd(ADC1, ENABLE); //¨Ïˉà«ü©waoADC1ao3n￥óÂà′«±ò°ê￥\ˉà

}
//àò±oADC-è
//ch:3q1D-è 0~3
u16 Get_Adc(u8 ch)
{
    //3]¸m«ü©wADCao3W«h2Õ3q1D¡A¤@-ó§Ç|C¡A±Ä¼Ë®é¶¡
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_71Cycles5 ); //ADC1,ADC3q1D,±Ä¼Ë®é¶¡¬°239.5¶g′á

ADC_SoftwareStartConvCmd(ADC1, ENABLE); //¨Ïˉà«ü©waoADC1ao3n￥óÂà′«±ò°ê￥\ˉà

while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//μ￥«YÂà′«μ2§ô

return ADC_GetConversionValue(ADC1); //ae|^3ìañ¤@|¸ADC13W«h2ÕaoÂà′«μ2aG
}

u16 Get_Adc_Average(u8 ch,u8 times)
{
u32 temp_val=0;
u8 t;
for(t=0;t<times;t++)
{
temp_val+=Get_Adc(ch);
delay_ms(5);
}
return temp_val/times;
}
void TIM2_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //®éÄá¨Ïˉà
//©w®é¾1TIM2aì©l¤Æ
TIM_TimeBaseStructure.TIM_Period = arr; //3]¸m|b¤U¤@-ó§ó·s¨Æ￥ó¸Ë¤J¬¡°êao|Û°ê-«¸Ë¸ü±H|s¾1¶g′áao-è
TIM_TimeBaseStructure.TIM_Prescaler =psc; //3]¸m￥Î¨ó§@¬°TIMx®éÄáàW2v°￡¼Æao1w¤ààW-è
TIM_TimeBaseStructure.TIM_ClockDivision =TIM_CKD_DIV1; //3]¸m®éÄá¤à3Î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;  //TIM|V¤W-p¼Æ¼ò|¡
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //®ú¾ú«ü©wao°Ñ¼Æaì©l¤ÆTIMxao®é¶¡°ò¼Æ3æ|ì

//¤¤Â_àu￥yˉÅNVIC3]¸m
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE ); //¨Ïˉà«ü©waoTIM2¤¤Â_,¤13\§ó·s¤¤Â_
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  ;  //TIM2¤¤Â_
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;  //￥y|ûàu￥yˉÅ0ˉÅ
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;  //±qàu￥yˉÅ2ˉÅ
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ3q1D3Q¨Ïˉà
NVIC_Init(&NVIC_InitStructure);  //aì©l¤ÆNVIC±H|s¾1
TIM_Cmd(TIM2, ENABLE);  //¨ÏˉàTIMx
}
void TIM2_IRQHandler(void) //TIM3??
{
  u16 adcx;
float temp;
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)  //??TIM3????????
{
   TIM_ClearITPendingBit(TIM2, TIM_IT_Update  );  //??TIMx??????
   adcx=Get_Adc_Average(ADC_Channel_1,10);
delay_ms(50);

TIM3_PWM_Init(adcx,adcx,adcx,adcx);

LCD_ShowxNum(156,130,adcx,4,16,0);//Åã￥üADCao-è
temp=(float)adcx*(3.3/4096);
adcx=temp;
LCD_ShowxNum(156,150,adcx,1,16,0);//Åã￥ü1qà￡-è,Åã￥ü1qà￡-ó|ì¼Æ-è
temp-=adcx;
temp*=1000;
LCD_ShowxNum(172,150,temp,3,16,0X80);//Åã￥ü1qà￡¤p¼Æ
   // LED0=!LED0;

   LCD_ShowString(60,250,200,24,24,"hunkchen2000@gmail.com");
LED0=!LED0;
}
}