stm32计数器递增/递减并在更改方向上重置

Question

how to add in this code reset on change direction? counter is tested with signal for stepper motor and working well, counting is up and down but limit is 32767 after -32766 -32765 ..

for reset on change direction i think to add this lines:

TIM_SlaveConfigTypeDef SlaveModeselect
TIM_MasterConfigTypeDef MasterConfig

SlaveModeselect.SlaveMode = ....
SlaveModeselect.InputTrigger = TIM_TS_TI1FP1 

MasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_......
MasterConfig.MasterOutputTrigger = .....

HAL_TIM_SlaveConfigSynchronization(&timer, &SlaveModeselect)
HAL_TIMEx_MasterConfigSynchronization(&timer, &MasterConfig) 

Current code:

#include "mbed.h"
#include "stm32f4xx.h"
#include "stm32f4xx_hal_tim_ex.h"

TIM_HandleTypeDef timer;
TIM_Encoder_InitTypeDef encoder;

//direction to PA_9 -- step pulse to PA_8

int main(){
     GPIO_InitTypeDef GPIO_InitStruct;
        __TIM1_CLK_ENABLE();
        __GPIOA_CLK_ENABLE();
        GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    timer.Instance = TIM1;
    timer.Init.Period = 0xffff;
    timer.Init.Prescaler = 1;
    timer.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    timer.Init.CounterMode = TIM_COUNTERMODE_UP;

    encoder.EncoderMode = TIM_ENCODERMODE_TI1; 
    encoder.IC1Filter = 0x0f;
    encoder.IC1Polarity = TIM_INPUTCHANNELPOLARITY_RISING; 
    encoder.IC1Prescaler = TIM_ICPSC_DIV1;
    encoder.IC1Selection = TIM_ICSELECTION_DIRECTTI;

    encoder.IC2Filter = 0x0f;
    encoder.IC2Polarity = TIM_INPUTCHANNELPOLARITY_RISING;    
    encoder.IC2Prescaler = TIM_ICPSC_DIV1;
    encoder.IC2Selection = TIM_ICSELECTION_INDIRECTTI;

    HAL_TIM_Encoder_Init(&timer, &encoder);
    HAL_TIM_Encoder_Start(&timer,TIM_CHANNEL_1);   


    TIM1->EGR = 1;           // Generate an update event
    TIM1->CR1 = 1;           // Enable the counter


 while (1) {
        int16_t count1;
        count1=TIM1->CNT; 

        printf("%d\r\n", count1);
        wait(1.0);

 };
} 

Answer 1

使用uint16_t count1而不是int16_t来使计数器计数达到65535，然后在发生溢出时将其重置为0。