Stm32 universal timer uses ec11 encoder

reference

http://www.51hei.com/bbs/forum.php?mod=viewthread&tid=145101

The following is TIM4 using ec11, which is very sensitive and normal

void Encoder_Init_TIM4(void)
{
    
    
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;  
  TIM_ICInitTypeDef TIM_ICInitStructure;  
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);//使能定时器4的时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//使能PB端口时钟
	
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;	//端口配置
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
  GPIO_Init(GPIOB, &GPIO_InitStructure);					      //根据设定参数初始化GPIOB
  
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // 预分频器 
  TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD; //设定计数器自动重装值
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//选择时钟分频：不分频
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;TIM向上计数  
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
  TIM_EncoderInterfaceConfig(TIM4, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);//使用编码器模式3
  TIM_ICStructInit(&TIM_ICInitStructure);
  TIM_ICInitStructure.TIM_ICFilter = 10;
  TIM_ICInit(TIM4, &TIM_ICInitStructure);
  TIM_ClearFlag(TIM4, TIM_FLAG_Update);//清除TIM的更新标志位
  TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
  //Reset counter
  TIM_SetCounter(TIM4,0);
  TIM_Cmd(TIM4, ENABLE); 
}

But simple copy and paste cannot operate multiple encoders.
After investigation, it is found that TIM2, 3, 4, and 5 are universal timers.

reference

https://blog.csdn.net/qq_38410730/article/details/79828852

It is found that TIM4 is available because of the definition of the pin.
TIM3 is found to correspond to PA6 PA7. The experiment is successful and multiple encoders can be operated.

Reference data sheet

https://www.st.com/resource/en/datasheet/stm32f103ze.pdf
31页 Table 5. High-density STM32F103xC/D/E pin definitions