STM32输入捕获，实现红外解码，支持长按

夜猫煮茶

原子哥的板，实测可以超过10米的接收范围，其它的不说了，直接上程序：

硬件初始化部分

static void RCC_Configuration( void );

static void GPIO_Configuration( void );

static void NVIC_Configuration( void );

void InputCaptureInit( void )

{

TIM_ICInitTypeDef TIM_ICInitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

RCC_Configuration();

NVIC_Configuration();

GPIO_Configuration();

TIM_TimeBaseInitStructure.TIM_Period             = 0xffff; // 16位计数

TIM_TimeBaseInitStructure.TIM_Prescaler          = 72*2-1;   // 144分频 2us

TIM_TimeBaseInitStructure.TIM_ClockDivision     = 0;      // 不分割

TIM_TimeBaseInitStructure.TIM_CounterMode   = TIM_CounterMode_Up; // 上升计数

TIM_TimeBaseInit( TIM2, &TIM_TimeBaseInitStructure );

TIM_ITConfig( TIM2, TIM_IT_Update, DISABLE );

TIM_ClearFlag(TIM2, TIM_FLAG_Update);

TIM_ICInitStructure.TIM_Channel       = TIM_Channel_2; // 选择通道2

TIM_ICInitStructure.TIM_ICPolarity     = TIM_ICPolarity_Falling;        // 下降沿触发

TIM_ICInitStructure.TIM_ICPrescaler   = TIM_ICPSC_DIV1; //

TIM_ICInitStructure.TIM_ICSelection  = TIM_ICSelection_DirectTI;

TIM_ICInitStructure.TIM_ICFilter        = 0x0;

TIM_ICInit( TIM2, &TIM_ICInitStructure );

TIM_ITConfig( TIM2, TIM_IT_CC2, DISABLE );

TIM_ClearFlag( TIM2, TIM_FLAG_CC2 );

TIM_Cmd( TIM2, ENABLE );

TIM_ITConfig( TIM2, TIM_IT_CC2 | TIM_IT_Update, ENABLE );

}

// 使能TIM2和GPIOA的时钟

static void RCC_Configuration( void )

{

RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2, ENABLE );

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );

}

// 设置PA1

static void GPIO_Configuration( void )

{

GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin      = GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode   = GPIO_Mode_IPU;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

// 设置NVIC

static void NVIC_Configuration( void )

{

NVIC_InitTypeDef NVIC_InitStructure;

/* Enable the TIM2 global Interrupt */

NVIC_InitStructure.NVIC_IRQChannel                          = TIM2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority      = 10;

NVIC_InitStructure.NVIC_IRQChannelCmd                    = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

解码部分：键值存放在IR_Key

extern volatile INT32U IR_Key;

void TIM2_IRQHandler( void )

{

static INT16U IR_LastPluse = 0;

static INT8U  IR_Sta         = 0;

static INT32U IR_Code      = 0;

static INT8U  IR_PluseCnt  = 0;

static INT8U  IR_Up          = 0;

INT16U IR_ThisPluse;

INT16U IR_PluseSub;

if ( TIM_GetITStatus( TIM2, TIM_IT_CC2 ) == SET )

{

TIM_ClearFlag( TIM2, TIM_IT_CC2 );

IR_Up = 0;

IR_ThisPluse = TIM_GetCapture2( TIM2 );

if ( IR_ThisPluse > IR_LastPluse )

{

IR_PluseSub = IR_ThisPluse - IR_LastPluse;

}

else {

IR_PluseSub = 0xffff - IR_LastPluse + IR_ThisPluse;

}

IR_LastPluse = IR_ThisPluse;

IR_PluseCnt++;

if ( IR_PluseCnt == 2 )

{

if (( IR_PluseSub > 5000 ) && ( IR_PluseSub < 8000 ))

{

IR_Sta = 0x01;

}

}

else if ( IR_Sta & 0x01 ) // 如果引导成功，开始接码

{

if (( IR_PluseSub < 450 ) || ( IR_PluseSub > 1300 ))

{

IR_Sta      = 0;

IR_PluseCnt = 0;

IR_Code     = 0;

}

else

{

IR_Code <<= 1;

if (( IR_PluseSub > 900 ) && ( IR_PluseSub < 1300 ))

{

IR_Code |= 0x01;

}

if ( IR_PluseCnt == 34 )

{

IR_Key = IR_Code;

IR_Sta = 0x02;

printf( "IR Down is : 0x%8x\n\n", IR_Key );

}

}

}

else if ( IR_Sta & 0x02 )

{

switch ( IR_PluseCnt )

{

case 35:

{

if ( ( IR_PluseSub < 4500 ) || ( IR_PluseSub > 7000 ) )

{

IR_PluseCnt--;

}

break;

}

case 36:

{

IR_PluseCnt = 34;

if ( ( IR_PluseSub > 45000) && ( IR_PluseSub < 60000 ) )

{

IR_Key = IR_Code;

printf( "IR continue is : 0x%8x\n\n", IR_Key );

}

break;

}

}

}

}

if ( TIM_GetITStatus( TIM2, TIM_IT_Update ) == SET )

{

TIM_ClearFlag( TIM2, TIM_IT_Update );

if ( GPIO_ReadInputDataBit( GPIOA, GPIO_Pin_1 ) == SET )

{

IR_Up++;

if ( IR_Up >= 2 )

{

IR_Code     = 0;

IR_Sta      = 0;

IR_PluseCnt = 0;

}

}

} 

}

正点原子

谢谢分享。

331086846

好么，顶一个！

pandy

来学习的

liwanfei

不错。谢谢分享！

dddd1

谢谢！！！！！