定时器1没有输出PWM波，求解？

STM32学徒 · 发表于 2014-3-14 10:22:31

#include "stm32f10x.h"

void TIM1_Config(void)

{

TIM_TimeBaseInitTypeDef TIM1_TimeBaseStructure;

TIM_OCInitTypeDef TIM1_OCInitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);//使能GPIOA口时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE); //使能TIM1时钟

//GPIO配置为：PA8输出

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //推免输出

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; //I/O电平翻转速度

GPIO_Init(GPIOA,&GPIO_InitStructure);

//定时器基本配置

TIM1_TimeBaseStructure.TIM_Period=1000-1; //计数值为1000

TIM1_TimeBaseStructure.TIM_Prescaler=3-1; //3分频

TIM1_TimeBaseStructure.TIM_ClockDivision=0; //采样分频0

TIM1_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM1,&TIM1_TimeBaseStructure);

TIM1_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1; //管脚输出模式

TIM1_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;

//PWM1模式通道1

TIM1_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM1_OCInitStructure.TIM_Pulse=250;

TIM_OC1Init(TIM1,&TIM1_OCInitStructure); //初始化TIM1

TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM1,ENABLE); //使能TIM1在ARR上的预装载寄存器

TIM_ClearFlag(TIM1,TIM_FLAG_CC1);//清除中断

TIM_ITConfig(TIM1,TIM_IT_CC1,ENABLE); //开启中断

TIM_CtrlPWMOutputs(TIM1,ENABLE); //PWM主输出使能，即使刹车寄存器的MOE位置1

TIM_Cmd(TIM1,DISABLE); //失能定时器1

}

void NVIC_Config(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannel=TIM1_CC_IRQn; //输出比较

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

int main(void)

{

SystemInit();

TIM1_Config();

NVIC_Config();

TIM_Cmd(TIM1,ENABLE); //开启TIM1，TIM1开始输出PWM

while(1);

}

我是新手求解啊，

时钟 · 发表于 2014-3-14 10:49:16

是不是因为TIM1是特殊时钟的关系啊

STM32学徒 · 发表于 2014-3-14 10:56:40

特殊时钟可以设置的吗，它是挂在APB2上的啊

745021926 · 发表于 2014-3-14 11:22:23

没看到DBTR的使能

STM32学徒 · 发表于 2014-3-14 11:51:00

回复【4楼】745021926:
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TIM_CtrlPWMOutputs(TIM1,ENABLE); //PWM主输出使能，即，使刹车寄存器BDTR的MOE位置1

745021926 · 发表于 2014-3-14 12:44:23

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO , ENABLE); //使能复用时钟

STM32学徒 · 发表于 2014-3-14 15:24:21

回复【6楼】745021926:
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为什么要加复用时钟啊。我的是原子mini板子，就想在PA8口输出PWM波。而且仿真会出现一些信息：
Load "..\\Obj\\123.AXF"
BS \main\60
LA (PORTA & 0x100) >> 8
*** error 65: access violation at 0x40012C00: no 'read' permission
*** error 65: access violation at 0x40012C00: no 'write' permission
。。。