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stm32f401rc encoderMode  of tim9 do not work

Question asked by YunHao Zhang on Oct 31, 2017
Latest reply on Oct 31, 2017 by Jan Waclawek

I used the PA2 PA3,the TIM9->CNT do not change

 

void MotorBEncoder_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM9, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_TIM9);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_TIM9);

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
TIM_TimeBaseStructure.TIM_Period = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM9, &TIM_TimeBaseStructure);

TIM_EncoderInterfaceConfig(TIM9, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);

TIM_ICInitStructure.TIM_ICFilter = 5;
TIM_ICInit(TIM9, &TIM_ICInitStructure);

TIM_SetCounter(TIM9,0);
TIM_Cmd(TIM9, ENABLE);
}

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