求助...用比较输出模式输出PWM波，一直出不来波形，实在是看不出哪里错了，求前辈们助~~~

zhs5170 · 发表于 2016-4-11 22:07:58

附程序，用的是Mini开发板，刚才那个好像发错区了，重新发一下...

[mw_shl_code=c,true]#include "stm32f10x_tim.h"
#include "stm32f10x_gpio.h"
#include "timer.h"
#include  <stm32f10x.h>

unsigned int CCR3_Val=1;
unsigned int capture1=0;
void TIM2_Init(void)
{

TIM_TimeBaseInitTypeDef  TIM2_TimeBaseStructure;
TIM_OCInitTypeDef  TIM2_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //定时器2时钟使能

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //TIM2的通道3
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel =TIM2_IRQn ; //配置定时器中断
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  TIM2_TimeBaseStructure.TIM_Prescaler = 719; //预分频器
  TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器向上计数模式 TIM2_CR1[4]=0
  TIM2_TimeBaseStructure.TIM_Period =0xffff;       //自动重装载寄存器
  TIM2_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseInit(TIM2,&TIM2_TimeBaseStructure); //

  TIM2_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle ; //TIM2_CCMR1[14:12]=011  翻转当TIM2_CCR2=TIM2_CNT时，翻转OC2REF的电平
  TIM2_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性  低电平有效 TIM2_CCER[5]=1;
  TIM2_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //输入/捕获2输出允许  OC2信号输出到对应的输出引脚PB5
  TIM2_OCInitStructure.TIM_Pulse =CCR3_Val; //若CC1通道配置为输出：CCR2是装入当前捕获/比较2 TIM2_CCR2寄存器的值（预装载值）。
  TIM_OC1Init(TIM2, &TIM2_OCInitStructure);
  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);


  TIM_Cmd(TIM2,ENABLE); //启动定时器3 TIM2_CR1[0]=1;

  TIM_ITConfig(TIM2,TIM_IT_CC1,ENABLE); //TIM2_DIER[2]=1  允许捕获/比较2中断
}

void TIM2_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET) //判断状态寄存器 TIM2_SR[2] 是否发生了捕获/比较2 中断
  {
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1); //软件清除状态寄存器 TIM2_SR[2] 捕获/比较2 中断中断标志
capture1 = TIM_GetCapture1(TIM2); //获取TIM2_CCR2的预装值
TIM_SetCompare1(TIM2, capture1+ CCR3_Val); //和CCR2_Val累加后装入TIM2_CCR2 这是为了配合计数器值的递增。以在下一次作出比较。
  }

}

#include  "stm32f10x.h"
#include  "stm32f10x_tim.h"
#include  "misc.h"

int main(void)
{

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  TIM2_Init(); //定时器的初始化
  while(1);
}

[/mw_shl_code]

勾勾先生 · 发表于 2016-4-11 22:07:59

給你參考一下，TIMER1改成2就可以，我比較輸出四個通道都可以用

uint16_t PrescalerValue;
uint16_t CCR1_Val = 1000;
uint16_t CCR2_Val = 500;
uint16_t CCR3_Val = 250;
uint16_t CCR4_Val = 64;
void RCC_Init(void)
{

//pll
RCC_ClocksTypeDef Rcc_initstuc;
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
while(RCC_WaitForHSEStartUp==ERROR);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
RCC_MCOConfig(RCC_MCO_SYSCLK);

/* PCLK1 = HCLK/4 */
//RCC_PCLK1Config(RCC_HCLK_Div4);
//timer3
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

}
void TIMER3_Init(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_DeInit(TIM3);
PrescalerValue = (uint16_t) (SystemCoreClock / 2000) - 1;
TIM_TimeBaseStructure.TIM_Period = 2000;
TIM_TimeBaseStructure.TIM_Prescaler = 360;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
//oc1~4&&pulse
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
  TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
  TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
  TIM_OC4Init(TIM3, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
//RCC->CR = 9<<1;
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3, ENABLE);
}
int main(void)
{
RCC_Init();
TIMER3_Init();
}