通過實驗發(fā)現(xiàn)，定時器的一個通道控制一個pwm信號。
在正式開始之前也可以參考這個視頻學(xué)習(xí)資料
(stm32直流電機驅(qū)動)
http://www.makeru.com.cn/live/1392_1218.html?s=45051
超聲波雷達(dá)測距儀
http://www.makeru.com.cn/live/15971_2626.html?s=45051
PWM驅(qū)動電機不需要中斷。
?、?timer.h:
#ifndef __TIMER_H
#define __TIMER_H
#include “sys.h”
void TIM3_PWM_Init(u16 arr,u16 psc);
#endif
② timer.c:
#include “timer.h”
#include “l(fā)ed.h”
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定時器3時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
//使能GPIO外設(shè)和AFIO復(fù)用功能模塊時鐘
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射
TIM3_CH2->PB5
1234
//設(shè)置該引腳為復(fù)用輸出功能,輸出TIM3 CH2的PWM脈沖波形 GPIOB.5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
1234
//初始化TIM3
TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數(shù)模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
//根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時間基數(shù)單位
//初始化TIM3 Channel2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
//選擇定時器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
//輸出極性:TIM輸出比較極性高
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM3 OC2
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的預(yù)裝載寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIM3
123456789
}
void TIM2_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能定時器2時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
//使能GPIO外設(shè)和AFIO復(fù)用功能模塊時鐘
GPIO_PinRemapConfig(GPIO_PartialRemap2_TIM2, ENABLE); //Timer2映射
TIM2_CH2->PB5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
123456789101112131415
//初始化TIM2
TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數(shù)模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
//根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時間基數(shù)單位
//初始化TIM2 Channel2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
//選擇定時器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
//輸出極性:TIM輸出比較極性高
TIM_OC2Init(TIM2, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM2 OC2
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM2在CCR2上的預(yù)裝載寄存器
TIM_Cmd(TIM2, ENABLE); //使能TIM2
123456789
}
③ main:
#include “l(fā)ed.h”
#include “delay.h”
#include “key.h”
#include “sys.h”
#include “timer.h”
int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init(); //延時函數(shù)初始化
LED_Init(); //LED端口初始化
TIM3_PWM_Init(899,0); //不分頻。PWM頻率=72000000/900=80Khz
while(1)
{
delay_ms(10);
if(dir)led0pwmval++;
else led0pwmval–;
if(led0pwmval>450)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare2(TIM3,led0pwmval);
TIM_SetCompare2(TIM2,led0pwmval);
}
12345
}
main中電機效果為加速減速加速減速
但main中后面while中可以只有
TIM_SetCompare2(TIM3,led0pwmval);
TIM_SetCompare2(TIM2,led0pwmval);
但需要自己給 led0pwmval設(shè)定一個值，調(diào)節(jié)占空比。這樣的話，電機就只能勻速轉(zhuǎn)動，
最后歡迎大家在參考完之后可以進(jìn)到群的大家庭探討學(xué)習(xí)交流，資料群文件自行下載【 310226693 】
