Question
TIM2 Configuration as up down counter Encoder Mode 1 or 2
Posted on June 19, 2018 at 18:29
I am trying to configure the TIM2 to act as an up/down counter as describe in Encoder mode 1 or 2. I have the circuit set up to connect PB8 to a count signal and PB9 as a direction signal. I have am having an issue where randomly after an NVIC_Reset the count direction is different dispite the value on PB9 being the same. The itnitialization code is below:
void initializeStepDir()
{
TIM_HandleTypeDef timer;
TIM_Encoder_InitTypeDef encoder;
// Enable syscfg clock
RCC->APB2ENR |= (RCC_APB2ENR_SYSCFGEN);
// Reset the TIM2 block
RCC->APB1RSTR |= (RCC_APB1RSTR_TIM2RST);
RCC->APB1RSTR &= ~(RCC_APB1RSTR_TIM2RST);
// Enable the TIM2 block
RCC->APB1ENR |= (RCC_APB1ENR_TIM2EN);
timer.Instance = TIM2;
timer.Init.Period = 0xffffffff;
timer.Init.Prescaler = 1;
timer.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
timer.Init.CounterMode = TIM_COUNTERMODE_UP;
constexpr uint32_t FILTER_NUMBER = 3;
encoder.EncoderMode = TIM_ENCODERMODE_TI1;
encoder.IC1Filter = FILTER_NUMBER;
encoder.IC1Polarity = TIM_INPUTCHANNELPOLARITY_RISING; //step signal
encoder.IC1Prescaler = TIM_ICPSC_DIV1;
encoder.IC1Selection = TIM_ICSELECTION_DIRECTTI;
encoder.IC2Filter = FILTER_NUMBER;
encoder.IC2Polarity = TIM_INPUTCHANNELPOLARITY_BOTHEDGE; //check direction
encoder.IC2Prescaler = TIM_ICPSC_DIV1;
encoder.IC2Selection = TIM_ICSELECTION_INDIRECTTI;
HAL_TIM_Encoder_Init(&timer, &encoder);
HAL_TIM_Encoder_Start(&timer, TIM_CHANNEL_ALL);
// NOTE: TI1 -> PB8 TI2 -> PB9
// https://community.st.com/external-link.jspa?url=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F32947972%2Fstm32-how-to-make-pulse-count-up-down-with-timer
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