STM32F051使用PWM互补输出N极起始异常
用了TIM1的1~3通道的PWM互补输出，发现每次调用TIM_SelectOCxM和TIM_CCxCmd后N极总会有一个1个多微秒的有效电平出来。初始代码：
nvicInitTypeDef.NVIC_IRQChannel = TIM1_CC_IRQn;//选择定时器1比较中断向量
nvicInitTypeDef.NVIC_IRQChannelCmd = ENABLE;//使能中断
nvicInitTypeDef.NVIC_IRQChannelPriority = 1;//设置中断优先级
NVIC_Init(&nvicInitTypeDef);//初始化中断向量
timeBaseInitTypeDef.TIM_ClockDivision = TIM_CKD_DIV1;//设置定时器分频
timeBaseInitTypeDef.TIM_CounterMode = TIM_CounterMode_Up;//设置定时器计数方向
timeBaseInitTypeDef.TIM_Period = 0xffff;//设置计数周期
timeBaseInitTypeDef.TIM_Prescaler = 0;//设置预分频
timeBaseInitTypeDef.TIM_RepetitionCounter = 0;//设置重复计数数
TIM_TimeBaseInit(TIM1, &timeBaseInitTypeDef);//根据结构体初始化
TIM_ARRPreloadConfig(TIM1, ENABLE);
timeOcInitTypeDef.TIM_OCIdleState = TIM_OCIdleState_Reset;
timeOcInitTypeDef.TIM_OCMode = TIM_OCMode_Timing;//使用定时模式，输出端口不受影响
timeOcInitTypeDef.TIM_OCNIdleState = TIM_OCIdleState_Reset;
timeOcInitTypeDef.TIM_OCNPolarity = TIM_OCNPolarity_High;
timeOcInitTypeDef.TIM_OutputNState = TIM_OutputNState_Disable;
timeOcInitTypeDef.TIM_OutputState = TIM_OutputState_Enable;
timeOcInitTypeDef.TIM_Pulse = 10000 - 1;//选择脉冲数
TIM_OC4Init(TIM1, &timeOcInitTypeDef);//调用初始化函数，初始化通道4
//PA7-TIM1_CC1+ U-
//PA8-TIM1_CC1- U+
//PA9-TIM1_CC2+ V+
//PB0-TIM1_CC2- V-
//PA10-TIM1_CC3+ W+
//PB1-TIM1_CC3- W-
gpioInitTypeDef.GPIO_Mode = GPIO_Mode_AF;//复用模式，调试的时候用的GPIO_Mode_OUT,浪费了2个小时，一直搞到凌晨1:40，正是个大乌龙！
gpioInitTypeDef.GPIO_OType = GPIO_OType_PP;
gpioInitTypeDef.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;
gpioInitTypeDef.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpioInitTypeDef.GPIO_Speed = GPIO_Speed_Level_3;
GPIO_Init(GPIOA, &gpioInitTypeDef);
gpioInitTypeDef.GPIO_Mode = GPIO_Mode_AF;//复用模式，调试的时候用的GPIO_Mode_OUT,浪费了2个小时，一直搞到凌晨1:40，正是个大乌龙！
gpioInitTypeDef.GPIO_OType = GPIO_OType_PP;
gpioInitTypeDef.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
gpioInitTypeDef.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpioInitTypeDef.GPIO_Speed = GPIO_Speed_Level_3;
GPIO_Init(GPIOB, &gpioInitTypeDef);
//TIM1复用模式要选GPIO_AF_2，不要选GPIO_AF_0,虽然库注释里GPIO_AF_0也有TIM1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);//0);//选择GPIOA7为复用0，TIM1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);//0);//选择GPIOA8为复用0，TIM1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2);//0);//选择GPIOA9为复用0，TIM1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2);//0);//选择GPIOA10为复用0，TIM1
GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_2);//0);//选择GPIOA7为复用0，TIM1
GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_2);//0);//选择GPIOA8为复用0，TIM1
timeOcInitTypeDef.TIM_OCIdleState = TIM_OCIdleState_Reset;
timeOcInitTypeDef.TIM_OCMode = TIM_OCMode_PWM1;//
timeOcInitTypeDef.TIM_OCNIdleState = TIM_OCIdleState_Set;//Reset;
timeOcInitTypeDef.TIM_OCNPolarity = TIM_OCNPolarity_High;
timeOcInitTypeDef.TIM_OutputNState = TIM_OutputNState_Enable;
timeOcInitTypeDef.TIM_OutputState = TIM_OutputState_Enable;
timeOcInitTypeDef.TIM_OCPolarity = TIM_OCPolarity_High;
timeOcInitTypeDef.TIM_Pulse = 10000;//选择脉冲数
TIM_OC1Init(TIM1, &timeOcInitTypeDef);
TIM_OC2Init(TIM1, &timeOcInitTypeDef);
TIM_OC3Init(TIM1, &timeOcInitTypeDef);
TIM_ITConfig(TIM1, TIM_IT_CC4, ENABLE);//使能第四通道比较中断
TIM_Cmd(TIM1, ENABLE);//使能定时器1
TIM_CtrlPWMOutputs(TIM1, ENABLE);在比较中断中轮流使能TIM1的CC1、CC2、CC3的PWM输出。
/**
* @brief 定时器1比较中断函数
* @}
*/
void TIM1_CC_IRQHandler(void)
{
if(SET == TIM_GetITStatus(TIM1, TIM_IT_CC4))
{
TIM_ClearITPendingBit(TIM1, TIM_IT_CC4);
switch(g_u32_pwm_select_cnt)
{
case 0:
{
TIM_ForcedOC2Config(TIM1, TIM_ForcedAction_InActive);
TIM_ForcedOC3Config(TIM1, TIM_ForcedAction_InActive);
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, ENABLE);
}
break;
case 1:
{
TIM_ForcedOC1Config(TIM1, TIM_ForcedAction_InActive);
TIM_ForcedOC3Config(TIM1, TIM_ForcedAction_InActive);
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, ENABLE);
}
break;
case 2:
{
TIM_ForcedOC1Config(TIM1, TIM_ForcedAction_InActive);
TIM_ForcedOC2Config(TIM1, TIM_ForcedAction_InActive);
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, ENABLE);
}
break;
case 3:
{
TIM_ForcedOC2Config(TIM1, TIM_ForcedAction_InActive);
TIM_ForcedOC3Config(TIM1, TIM_ForcedAction_InActive);
TIM_ForcedOC1Config(TIM1, TIM_ForcedAction_InActive);
//TIM_CtrlPWMOutputs(TIM1, DISABLE);
}
break;
}
if(g_u32_pwm_select_cnt < 3)
{
g_u32_pwm_select_cnt ++;
}
else
{
g_u32_pwm_select_cnt = 0;
}
}
}
在运行中改变定时器参数要先失能禁用定时器 先更新一下UG位再使能定时器看看。 wenyangzeng 发表于 2018-12-1 13:54
在运行中改变定时器参数要先失能禁用定时器
是这样的，我试过，只要定时器使能了就会在N极产生一个1微秒左右的有效电平。 す疯Ⅱ恒す 发表于 2018-12-1 15:41
先更新一下UG位再使能定时器看看。
不行，我在初始化和中断中都是了，调用TIM_ClearFlag(TIM1,TIM_FLAG_Update);
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