stm32f103VCT6 定时器TIM1输出PWM 一直是低电平

只看该作者 · 2015-11-28 23:32

这个是买开发板配套的软件，用定时器TIM1输出PWM。但是我用逻辑分析仪仿真的时候一直都是低电平，不会跳变这个为什么啊。
下面是代码。
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

。。。
void GPIO_Configuration(void)
{

/* GPIOA Configuration: Channel 1, 2, 3 and 4 Output */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM1, ENABLE);

/* GPIOB Configuration: Channel 1N, 2N and 3N Output */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/* GPIOB Configuration: BKIN pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

}

u16 capture = 0;
u16 CCR1_Val = 1800;
u16 CCR2_Val = 900;
u16 CCR3_Val = 450;

void TIM_Configuration()
{
TIM_DeInit(TIM1);
/* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 3600-1;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

/* Channel 1,2,3 and 4 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;

  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;

  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  TIM_OC1Init(TIM1,&TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
  TIM_OC2Init(TIM1,&TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
  TIM_OC3Init(TIM1,&TIM_OCInitStructure);

  /* Automatic Output enable, Break, dead time and lock configuration */
  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;

  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
  TIM_BDTRInitStructure.TIM_DeadTime = 0x75;
  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;

  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
  TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);

TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);

。。。
}

只看该作者 · 2020-2-2 17:59

楼主解决了没有，现在我的F103R8T6遇到同样的问题，不发PWM的时候是低电平。