stm32如何使脉冲计数向上/向下计时器

Question

我需要为我的个人项目计数脉冲和计时器的方向。使用此代码我只能计算一个方向。 任何建议，欢迎为正确的代码（该代码被预测试）

脉冲计数到PA_9和方向输入到PA_8

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


TIM_HandleTypeDef timer;   
TIM_Base_InitTypeDef inizializza; 
TIM_IC_InitTypeDef startclock; 
TIM_ClockConfigTypeDef ClockConfig; 
TIM_SlaveConfigTypeDef sSlaveConfigure; 
TIM_MasterConfigTypeDef sMasterConfig; 
TIM_Encoder_InitTypeDef hEncoder1; 

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 = 0; 
    timer.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; 
    timer.Init.CounterMode = TIM_COUNTERMODE_CENTERALIGNED3; 
    timer.Init.RepetitionCounter = 0; 

    HAL_TIM_Base_Init(&timer); 


    sSlaveConfigure.SlaveMode = TIM_SLAVEMODE_DISABLE; 
    HAL_TIM_SlaveConfigSynchronization(&timer, &sSlaveConfigure); 

    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE; 
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; 
    HAL_TIMEx_MasterConfigSynchronization(&timer, &sMasterConfig); 

    ClockConfig.ClockFilter = 0; 
    ClockConfig.ClockPolarity = TIM_CLOCKPOLARITY_RISING; 
    ClockConfig.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1; 
    ClockConfig.ClockSource = TIM_CLOCKSOURCE_TI2; 
    HAL_TIM_ConfigClockSource(&timer, &ClockConfig); 
    TIM1->CR1 |= TIM_CR1_ARPE; // autoreload on 
    //TIM1->CR1 |= TIM_CR1_CEN; 
    TIM1->CR1 = 1; // enable timer 

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

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

}; 
} 

Answer 1

尝试使用算术。假设方向包含有关方向的信息（从外部引脚读取值），计数器是最终结果。

unsigned char direction=0; 
unsigned int counter=0; 

while (1) { 
    int16_t count1; 

    //Read current counter value 
    count1=TIM1->CNT; 

    //Check for direction Up (use PA_8 instead direction here) 
    if(direction=0){ 
     counter = count; 
    } 
    else 
    { 
     //Check for direction down 
     counter = TIMER_MAX - count1; 
    } 

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

}; 

我希望这可以帮助你。 Ciao的

Answer 2

这段代码运行良好

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

TIM_HandleTypeDef timer; 
TIM_Encoder_InitTypeDef encoder; 

//direction to PA_9 -- step 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; //step signal 
    encoder.IC1Prescaler = TIM_ICPSC_DIV1; 
    encoder.IC1Selection = TIM_ICSELECTION_DIRECTTI; 

    encoder.IC2Filter = 0x0f; 
    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_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); 

}; 
}