【Mini-F5375-OB开发板评测】脉冲编码器计数

MM32F5375芯片的高级定时器TIM1/8，从模式可以配置为编码器接口

一、准备工作
脉冲编码器一个
这里只接了A+、A-、B+、B-、5V、GND，接线如图

二、示例代码
需要用到串口打印计数值，USB的调试口是uart3
1、串口配置

void USART_Configure(uint32_t Baudrate)
{
    GPIO_InitTypeDef  GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    USART_StructInit(&USART_InitStruct);
    USART_InitStruct.USART_BaudRate   = Baudrate;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits   = USART_StopBits_1;
    USART_InitStruct.USART_Parity     = USART_Parity_No;
    USART_InitStruct.USART_Mode       = USART_Mode_Rx | USART_Mode_Tx;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_Init(USART3, &USART_InitStruct);

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_7);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_7);

    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_10;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStruct);

    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_11;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_FLOATING;
    GPIO_Init(GPIOC, &GPIO_InitStruct);

    USART_Cmd(USART3, ENABLE);
}

串口重定向

int fputc(int ch, FILE *f)
{
    USART_SendData(USART3, (uint8_t)ch);

    while (RESET == USART_GetFlagStatus(USART3, USART_FLAG_TC))
    {
    }

    return (ch);
}

2、定时器配置

void TIM1_8_Configure(void)
{
    GPIO_InitTypeDef        GPIO_InitStruct;
    TIM_ICInitTypeDef       TIM_ICInitStruct;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;

    /* TIM1 */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_1);   /* TIM1_CH1 */
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);   /* TIM1_CH2 */

    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    TIM_TimeBaseStructInit(&TIM_TimeBaseInitStruct);
    TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
    TIM_TimeBaseInitStruct.TIM_Period    = UINT16_MAX;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);

//    TIM_EncoderInterfaceConfig(TIM1, TIM_EncoderMode_TI1, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);
//    TIM_EncoderInterfaceConfig(TIM1, TIM_EncoderMode_TI2, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);
    TIM_EncoderInterfaceConfig(TIM1, TIM_EncoderMode_TI12, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);

    TIM_ICStructInit(&TIM_ICInitStruct);
    TIM_ICInitStruct.TIM_Channel  = TIM_Channel_1;
    TIM_ICInitStruct.TIM_ICFilter = 6;
    TIM_ICInit(TIM1, &TIM_ICInitStruct);

    TIM_SetCounter(TIM1, 0);
    TIM_Cmd(TIM1, ENABLE);

    /* TIM8 */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

    GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_3);   /* TIM8_CH1 */
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_3);   /* TIM8_CH2 */

    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_IPU;
    GPIO_Init(GPIOC, &GPIO_InitStruct);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);

    TIM_TimeBaseStructInit(&TIM_TimeBaseInitStruct);
    TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
    TIM_TimeBaseInitStruct.TIM_Period    = UINT16_MAX;
    TIM_TimeBaseInit(TIM8, &TIM_TimeBaseInitStruct);

//    TIM_EncoderInterfaceConfig(TIM8, TIM_EncoderMode_TI1, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);
//    TIM_EncoderInterfaceConfig(TIM8, TIM_EncoderMode_TI2, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);
    TIM_EncoderInterfaceConfig(TIM8, TIM_EncoderMode_TI12, TIM_ICPolarity_Falling, TIM_ICPolarity_Falling);

    TIM_ICStructInit(&TIM_ICInitStruct);
    TIM_ICInitStruct.TIM_Channel  = TIM_Channel_1;
    TIM_ICInitStruct.TIM_ICFilter = 6;
    TIM_ICInit(TIM8, &TIM_ICInitStruct);

    TIM_SetCounter(TIM8, 0);
    TIM_Cmd(TIM8, ENABLE);
}

三、示例演示
转动编码器，当计数值发生变化时串口打印计数值