CODEWITHSUNDEEP
timercounterstm32encoderpulse
paolo della vedova
paolo della vedova

Reputation: 71

stm32 counter up/down and reset on change direction

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);

 };
}

Upvotes: 0

Views: 4816

Answers (1)

jayant
jayant

Reputation: 2389

use uint16_t count1 instead of int16_t to have your counter count up to 65535 then reset to 0 when there is an overflow.

Upvotes: 1

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