详解STM32高级定时器-PWM简单学习案例

高级定时器与通用定时器比较类似，下面是一个TIM1 的PWM 程序，TIM1是STM32唯一的高级定时器。共有4个通道有死区有互补。

先是配置IO脚：

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); //重设为缺省值

TIM_TimeBaseStructure.TIM_Prescaler = 4000; //预分频(时钟分频)72M/4000=18K

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数

TIM_TimeBaseStructure.TIM_Period = 144; //装载值 18k/144=125hz 就是说向上加的144便满了

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置了时钟分割 不懂得不管

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期计数器值 不懂得不管

TIM_TimeBaseInit(TIM1，&TIM_TimeBaseStructure); //初始化TIMx的时间基数单位

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; //占空时间 144 中有40的时间为高，互补的输出正好相反

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互补端的极性

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空闲状态下的非工作状态不管

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管

TIM_OC1Init(TIM1，&TIM_OCInitStructure); //数初始化外设TIMx通道1这里2.0库为TIM_OCInit

TIM_Cmd(TIM1，ENABLE);

TIM_CtrlPWMOutputs(TIM1，ENABLE);

}

//设置捕获寄存器1

void SetT1Pwm1(u16 pulse)

{

TIM1-》CCR1=pulse;

}

//在MAIN 中加点键盘扫描啥的用来改变占空比

#include “STM32Lib\stm32f10x.h”

#include “hal.h”

extern void SetT1Pwm1(u16 pulse);

int main(void)

{

u16 pulse=40;

ChipHalInit(); //片内硬件初始化

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);

}

}

}

}