[Review of Arteli Development Board AT32F421] 6. Further study of EC11 encoder

ddllxxrr

[Review of Arteli Development Board AT32F421] 6. Further study of EC11 encoder [Copy link]

 

Last time, I succeeded with interrupts, but this time I succeeded with reading the level. Last time I thought interrupts were the best, but this time I think level is better, because after all, there is no need for interrupts.

This time it’s the same picture:

It can be seen that when A is low, if B is also low, it rotates clockwise.

If B is high when A is low, it rotates counterclockwise.

The reason I failed to adjust it last time was because I added a 330 ohm current limiting resistor, which interfered with the shape of the wave.

I connected A and B to A8 and A9 respectively. The program is as follows:

void EC11_Display()
{

  
   uint8_t i;  
	
	EC11_Flag = 0;
  Left_Flag = 0;
  Right_Flag = 0;	
	
	if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pins_8) == 0)//开始检测是否旋转了开关
                {
                        Delay_ms(1);//消除抖动
                        if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pins_8) == 0) //确实是旋转了，进行正反转判断
                        {
                                if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pins_9) == 0)//正转，进行正转处理
                                {
                                        EC11_Value++;//为了使LED正向递增
																	     
                                }
                                else if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pins_9) == 1)//反转，进行反转处理
                                {
                                        EC11_Value--;//为了使LED反向递减
//																	      printf("This is %d\n\t",EC11_Value);
//																	      Delay_ms(200);//延时等待
                                }
                        }
                        while(GPIO_ReadInputDataBit(GPIOA,GPIO_Pins_8) == 0)//等待开关A端复位（断开），防止出现乱加减的现象
                        {
                                Delay_ms(20);//延时等待
                        }
	
	
					}
	

	
	
}

The results of the operation are as follows:

Jacktang

The encoder turns left and right, and uses a timer to detect the status and how often it is detected

The author's review progress is very fast and it is already the sixth article

w494143467

Not bad! The progress is very fast!

annysky2012

The review is very detailed, come on

freebsder

Thanks for sharing, looking forward to the follow-up!

ddllxxrr

Jacktang posted on 2021-4-23 22:34 The encoder has the function of turning left and right. The timer is used to detect the status. How long does it take to detect it? The author's evaluation progress is very fast and it is already the sixth article

A timer is definitely fine, I think the faster the better, for example once every 2MS, because the user's rotation speed is not fixed.