詳解STM32高級(jí)定時(shí)器-PWM簡(jiǎn)單學(xué)習(xí)案例

高級(jí)定時(shí)器與通用定時(shí)器比較類似，下面是一個(gè)TIM1 的PWM 程序，TIM1是STM32唯一的高級(jí)定時(shí)器。共有4個(gè)通道有死區(qū)有互補(bǔ)。

先是配置IO腳：

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA， GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB， GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1，ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA， ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB， ENABLE);

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

void Tim1_Configuration(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_DeInit(TIM1); //重設(shè)為缺省值

TIM_TimeBaseStructure.TIM_Prescaler = 4000; //預(yù)分頻(時(shí)鐘分頻)72M/4000=18K

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計(jì)數(shù)

TIM_TimeBaseStructure.TIM_Period = 144; //裝載值 18k/144=125hz 就是說(shuō)向上加的144便滿了

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設(shè)置了時(shí)鐘分割 不懂得不管

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期計(jì)數(shù)器值 不懂得不管

TIM_TimeBaseInit(TIM1，TIM_TimeBaseStructure); //初始化TIMx的時(shí)間基數(shù)單位

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 PA8

TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //反向通道也有效 PB13

TIM_OCInitStructure.TIM_Pulse = 40; //占空時(shí)間 144 中有40的時(shí)間為高，互補(bǔ)的輸出正好相反

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互補(bǔ)端的極性

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空閑狀態(tài)下的非工作狀態(tài)不管

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管

TIM_OC1Init(TIM1，TIM_OCInitStructure); //數(shù)初始化外設(shè)TIMx通道1這里2.0庫(kù)為TIM_OCInit

TIM_Cmd(TIM1，ENABLE);

TIM_CtrlPWMOutputs(TIM1，ENABLE);

}

//設(shè)置捕獲寄存器1

void SetT1Pwm1(u16 pulse)

{

TIM1-》CCR1=pulse;

}

//在MAIN 中加點(diǎn)鍵盤掃描啥的用來(lái)改變占空比

#include “STM32Lib\stm32f10x.h”

#include “hal.h”

extern void SetT1Pwm1(u16 pulse);

int main(void)

{

u16 pulse=40;

ChipHalInit(); //片內(nèi)硬件初始化

ChipOutHalInit(); //片外硬件初始化

for(;;)

{

if(GET_UP())

{

while(GET_UP());

if(pulse《=144)

{

pulse+=5;

SetT1Pwm1(pulse);

}

}

if(GET_DOWN())

{

while(GET_DOWN());

if(pulse》30)

{

pulse-=5;

SetT1Pwm1(pulse);

}

}

}

}