【STM32】 6步PWM输出
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需要用到方波，今天看了下ST官方例程里的6步PWM,先验证下
Step1 | Step2 | Step3 | Step4 | Step5 | Step6
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|Channel1|1|0|0|0|0|1|
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|Channel1N|0|0|1|1|0|0|
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|Channel2|0|0|0|1|1|0|
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|Channel2N|1|1|0|0|0|0|
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|Channel3|0|1|1|0|0|0|
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|Channel3N|0|0|0|0|1|1|
int main(void)
{
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
SysTick_Configuration();
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Period = 4095;
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_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 2047;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = 1023;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = 511;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
/* Automatic Output enable, Break, dead time and lock configuration*/
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_DeadTime = 1;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
TIM_CCPreloadControl(TIM1, ENABLE);
TIM_ITConfig(TIM1, TIM_IT_COM, ENABLE);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
while(1)
{}
}
void TIM1_TRG_COM_IRQHandler(void)
{
/* Clear TIM1 COM pending bit */
TIM_ClearITPendingBit(TIM1, TIM_IT_COM);
if(step==1)
{
/* Next step: Step 2 Configuration ---------------------------- */
/* Channel3 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Disable);
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Enable);
step++;
}else if(step==2)
{
/* Next step: Step 3 Configuration ---------------------------- */
/* Channel1 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1 , TIM_CCxN_Disable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Enable);
step++;
}else if(step==3)
{
/* Next step: Step 4 Configuration ---------------------------- */
/* Channel2 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2 , TIM_CCxN_Disable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Enable);
step++;
}else if(step==4)
{
/* Next step: Step 5 Configuration ---------------------------- */
/* Channel3 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3 , TIM_CCxN_Disable);
/* Channel2 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Enable);
step++;
}else if(step==5)
{
/* Next step: Step 6 Configuration ---------------------------- */
/* Channel1 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1 , TIM_CCxN_Disable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Enable);
step++;
}else if(step==6)
{
/* Next step: Step 1 Configuration ---------------------------- */
/* Channel2 configuration */
TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_2 , TIM_CCxN_Disable);
/* Channel1 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Enable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Disable);
/* Channel3 configuration */
TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Enable);
step=1;
}
}
但是目前上三路可以输出PWM，对应下桥则是一直输出高。
TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1);
TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Enable);
问题应该处在这三个函数这，使能主通道PWM,失能互补通道，结果是正常的（主通道pwm，互补通道为低）；但是失能主通道，使能互补通达，两路输出的都是低。
进入到函数里，发现是对TIM1_CCER寄存器进行操作。该寄存器主要是对4个输出通道的进行配置。配置参数主要是通道/互补通道输出使能、通道/互补通道输出极性 。
CC1E = 1,CC1NE = 1——两路互补pwm；
CC1E = 1,CC1NE = 0——一路pwm,一路为0；
**CC1E = 0,CC1NE = 1——都为低；此处应该是主通道为底，互补通道为pwm
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在配置好TIM1通道后，直接给定step值，在while(1) 调用就没有上面的问题。感觉离真相越来越近啦。
应该和 中断函数 TIM_ITConfig(TIM1, TIM_IT_COM, ENABLE);有关
不过一般驱动BLDC的方波都是一个PWM，一个ON。两个都是PMW会有很大的杂波
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