Posted on August 28, 2017 at 10:52Dear All,
I want to use pwm input capture GPIOA.6 and GPIOA.7 using TIM3 on STM32F407IG(176pin)
Channel 1 and Channel 2 work's fine if I set just one of them.
But channel 1 and channel 2 does not work if I set at the same time.
void TIM3_IRQHandler(void)
{
#if 1
if((TIM_GetITStatus(TIM3, TIM_IT_CC1)==SET))
{
TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
GetFrequencyCycleCount(NUM1, TIM_GetCapture1(TIM3));
}
#endif
#if 2
if((TIM_GetITStatus(TIM3, TIM_IT_CC2)==SET))
{
TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
GetFrequencyCycleCount(NUM2, TIM_GetCapture2(TIM3));
}
#endif
}
void TIM3_TimerSet(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* GPIOA clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
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_PinSource7, GPIO_AF_TIM3);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_TIM3);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_TIM3);
#if 1
TIM_TimeBaseStructure.TIM_Period = TIMER_PERIOD;
TIM_TimeBaseStructure.TIM_Prescaler = 84-1;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
#endif
#if 1
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
#endif
#if 1
/* Select the TIM3 Input Trigger*/
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1|TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM3,TIM_MasterSlaveMode_Enable);
#endif
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM3, TIM_IT_CC1|TIM_IT_CC2, ENABLE);
}
#endif
