STM32F051比较器周期电流控制的问题
本帖最后由 njliweizhi-320212 于 2016-4-29 18:29 编辑1、TIM3配置
void TIM_Configuration( void )
{
uint16_t TimerPeriod = 0;
uint16_t Channel1Pulse = 0, Channel2Pulse = 0;
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;
TIM_OCInitTypeDefTIM_OCInitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //245_EN
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* GPIOA (PA6,PA7)Configuration: PA6->TIM3_CH1, PA7->TIM3_CH2 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_1);
/* GPIOB (PB0,PB1)Configuration: PB0->TIM3_CH4, PB1->TIM3_CH3 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1);
TimerPeriod = (SystemCoreClock / PWM_FREQ ) - 1;
/* Compute CCR1 value to generate a duty cycle at 50% for channel 1 */
Channel1Pulse = (uint16_t) (((uint32_t) MOS_OPEN * (TimerPeriod - 1)) / 100);
/* Compute CCR2 value to generate a duty cycle at 37.5%for channel 2 */
Channel2Pulse = (uint16_t) (((uint32_t)LOW_TENSION * (TimerPeriod - 1)) / 100);
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned2 ;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &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_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse; //Channel1Pulse;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; //Channel1Pulse;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
/* TIM1 counter enable */
TIM_Cmd(TIM3, ENABLE);
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM3, ENABLE);
PWM_ENABLE();
}
PWM能正常工作。
2、比较器配置
void compdaconfig(void)
{
DAC_InitTypeDef DAC_InitStructure;
COMP_InitTypeDef COMP_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //DA輸出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* DAC channel1 Configuration */
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
/* DAC Channel1 Init */
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
/* Enable DAC Channel1 */
DAC_Cmd(DAC_Channel_1, ENABLE);
/* COMP1 Init: the higher threshold is set to VREFINT ~ 1.22V
but can be changed to other available possibilities */
COMP_StructInit(&COMP_InitStructure);
COMP_InitStructure.COMP_InvertingInput = COMP_InvertingInput_DAC1;
COMP_InitStructure.COMP_Output = COMP_Output_TIM3OCREFCLR;
COMP_InitStructure.COMP_OutputPol = COMP_OutputPol_NonInverted;
COMP_InitStructure.COMP_Mode = COMP_Mode_HighSpeed;
COMP_InitStructure.COMP_Hysteresis = COMP_Hysteresis_No;
COMP_Init(COMP_Selection_COMP1, &COMP_InitStructure);
COMP_SwitchCmd(DISABLE);
COMP_WindowCmd(DISABLE);
COMP_Cmd(COMP_Selection_COMP1,ENABLE);
}
DA管脚输出正常用COMP_GetOutputLevel(COMP_Selection_COMP1)检测比较器反转正常，但他对TIM3的PWM没有任何作用，监控COMP->CSR =0X4741 证明设定的输出连接COMP_Output_TIM3OCREFCLR=111也是对的，但为什么就是不能实现逐周期控制，不知道有没有人用过。
比较器其他应用的例程都有，就没有这个的例程，我搜网上有一个人也用不起来，后来比较器输出管脚再到定时器ETR，到底这个功能不知道有没有用 感谢STM32的邵工，问题解决了。失败的原因：
1、中文版的资料 跟这个有关的部分翻译的时候阉割掉了，看英文版的就有这个介绍了。
2、解决的方法增加了3句话
TIM_SelectOCREFClear(TIM3,TIM_OCReferenceClear_OCREFCLR);
TIM_ClearOC1Ref(TIM3, TIM_OCClear_Enable);
TIM_ClearOC4Ref(TIM3, TIM_OCClear_Enable); :lol:lol:lol楼主还在么，能解释下原理吗
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