Posted on January 29, 2017 at 12:29Hi Forum,
Can anyone tell me why
TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI1, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);
doesn't work the way I expect it to?
No matter what I tell it to do, it always counts on both edges of the input signal.
I'm using a STM32F103RB with uVision5.22.
Here is the code:
/*-------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStruct);
TIM_TimeBaseStruct.TIM_Period = 0xFF;
TIM_TimeBaseStruct.TIM_Prescaler = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStruct);
TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI1,
TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);
TIM2->CNT = 0;
TIM_Cmd(TIM2, ENABLE);
/*--------------------------------------*/
Thanks,
Wilko
