利用STM8单片机定时器tiM1的PWM输入捕获模式测量红外遥控码

leslie_aqiang

1.红外遥控

码格式为NEC红外编码。

2.

红外接收信号输入接PC1（TIM1输入通道1）。

3.

采用外部

晶振

16M。

4.

采用IAR FOR STM8开发环境。

5.

程序代码如下：

//--------------------------------------------------------------------

＃i nclude <io

stm8s

105s4.h>

#define uchar              unsigned char

#define uint                unsigned int

uchar IrRecStep = 0;                             //接收步骤

uchar IrIndex = 0;                                //接收位数

uchar IrRecFlag = 0;                             //接收完标志

uchar IrRecBuff[4];                               //接收缓冲区

uchar IrRecAddr1;                                //红外地址码

uchar IrRecA

ddr2

;

uchar IrRecData1;                                //红外数据码

uchar IrRecData2;

uint IrCycle = 0;                                  //红外周期

uint IrHigh = 0;                                   //占空比

const uchar IrCode[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};

//--------引导码低电平范围------------------

#define IrHeadLow_Max       2300            //2300*4 = 9200us

#define IrHeadLow_Min        2100            //2100*4 = 8400us

//--------引导码高电平范围------------------

#define IrHeadHigh_Max      1250            //1250*4 = 5000us

#define IrHeadHigh_Min       1050            //1050*4 = 4200us

//--------数据0的周期范围-------------------

#define IrData00_Max         300             //300*4 = 1200us

#define IrData00_Min          260             //260*4 = 1040us

//--------数据1的周期范围-------------------

#define IrData10_Max         580             //580*4 = 2320us

#define IrData10_Min          540             //540*4 = 2160us

//--------数据0的占空比(高电平)范围---------

#define IrData0_Max          160             //160*4 = 640us

#define IrData0_Min           120             //120*4 = 480us

//--------数据1的占空比(高电平)范围---------

#define IrData1_Max          440             //440*4 = 1760us

#define IrData1_Min           400             //400*4 = 1600us

//----------------------------------------------------------

#define REMOTE_CLK_DIV       63              //63+1=64----16Mh/64=4us

#define REMOTE_ICF_FILTER   0x30

//延时程序

void Delay_ms( uint ms )

{

uint i,j;

for( j=0; j   {

for( i=0; i<1000; i++ )

{;}

}

}

//红外接收端口初始化

void Ir_Init(void)

{

PC_DDR_DDR1 = 0;       //PC1为输入

PC_CR1_C11 = 1;

PC_CR2_C21 = 0;

}

//使用TIM1的PWM输入捕获

void Ir_PWM_Init(void)

{

TIM1_PSCRH = 0;

TIM1_PSCRL = REMOTE_CLK_DIV;

TIM1_CCER1 &= 0xee;//禁止输入捕获1，2

TIM1_CCMR1

= (REMOTE_ICF_FILTER + 0x01);// ch1到ti1fp1

TIM1_CCER1 &= 0xec;//ch1 上升沿触发

TIM1_CCMR2

= (REMOTE_ICF_FILTER + 0x02);// ch2选择 ti1fp2上

TIM1_CCER1

= 0x20;//ch1 下降沿触发 ic2

TIM1_SMCR

= 0x54;//选源触发源和触发方式 复位

TIM1_CCER1

= 0x11;//使能输入捕获1，2

TIM1_CR1

= 0x05;

}

//红外接收程序

void Ir_Receive(void)

{

switch(IrRecStep)

{

case 0:

IrIndex = 0;

if ((TIM1_SR1_CC1IF == 1)&&(TIM1_SR1_CC2IF == 1))

{

IrHigh = (uint)(TIM1_CCR2H);

IrHigh = (IrHigh << 8) + TIM1_CCR2L;  //IrHigh占空比

IrCycle = (uint)(TIM1_CCR1H);

IrCycle = (IrCycle << 8) + TIM1_CCR1L;  //IrCycle周期

//是否在引导码低电平范围内

if (((IrCycle - IrHigh) < IrHeadLow_Max)&&((IrCycle - IrHigh) > IrHeadLow_Min))

{

IrRecStep = 1;

TIM1_SR1_CC1IF = 0;

TIM1_SR1_CC2IF = 0;

TIM1_SR2_CC1OF = 0;

TIM1_SR2_CC2OF = 0;

TIM1_SR1_UIF = 0;

IrRecBuff[0] = 0;

IrRecBuff[1] = 0;

IrRecBuff[2] = 0;

IrRecBuff[3] = 0;

}

}

break;

case 1:

if ((TIM1_SR2_CC1OF==1)

(TIM1_SR2_CC2OF==1)

(TIM1_SR1_UIF==1))

{

IrRecStep = 0;

}

else

{

if ((TIM1_SR1_CC1IF == 1)&&(TIM1_SR1_CC2IF == 1))

{

IrHigh = (uint)(TIM1_CCR2H);

IrHigh = (IrHigh << 8) + TIM1_CCR2L;

IrCycle = (uint)(TIM1_CCR1H);

IrCycle = (IrCycle << 8) + TIM1_CCR1L;

//是否在引导码高电平范围内

if ((IrHigh < IrHeadHigh_Max)&&(IrHigh > IrHeadHigh_Min))

{

IrRecStep = 2;

}

}

}

break;

case 2:

if ((TIM1_SR2_CC1OF==1)

(TIM1_SR2_CC2OF==1)

(TIM1_SR1_UIF==1))

{

IrRecStep = 0;

}

else

{

if ((TIM1_SR1_CC1IF == 1)&&(TIM1_SR1_CC2IF == 1))

{

IrHigh = (uint)(TIM1_CCR2H);

IrHigh = (IrHigh << 8) + TIM1_CCR2L;

IrCycle = (uint)(TIM1_CCR1H);

IrCycle = (IrCycle << 8) + TIM1_CCR1L;

//周期是否在数据0范围内

if ((IrCycle > IrData00_Min)&&(IrCycle < IrData00_Max))

{

//高电平是否在数据0范围内

if ((IrHigh > IrData0_Min)&&(IrHigh < IrData0_Max))

{

IrIndex++;

}

else

{

IrRecStep = 0;

}

}

//周期是否在数据1范围内

else if ((IrCycle > IrData10_Min)&&(IrCycle < IrData10_Max))

{

//高电平是否在数据1范围内

if ((IrHigh > IrData1_Min)&&(IrHigh < IrData1_Max))

{

IrRecBuff[IrIndex >> 3]

= IrCode[IrIndex & 0x07];

IrIndex++;

}

else

{

IrRecStep = 0;

}

}

else

{

IrRecStep = 0;

}

if(IrIndex >= 32)

{

IrRecStep = 0;

IrRecFlag = 1;

}

}

}

break;

}

}

//

时钟

初始化

void CLK_Init(void)

{

CLK_ECKR=0x03;//外部时钟寄存器 外部时钟准备就绪，外部时钟开

CLK_SWCR=0x02;//切换控制寄存器 使能切换机制

CLK_SWR=0xB4;//主时钟切换寄存器 选择HSE为主时钟源*/

while (!(CLK_SWCR & 0x08));

CLK_CSSR=0x01;//时钟安全系统寄存器

}

//初始化

void Devices_Init(void)

{

Delay_ms(200);

CLK_Init();

Ir_Init();

Ir_PWM_Init();

}

//主程序

void main( void )

{

Devices_Init();

while(1)

{

Ir_Receive();

if(IrRecFlag == 1)

{

IrRecAddr1 = IrRecBuff[0];

IrRecAddr2 = IrRecBuff[1];

IrRecData1 = IrRecBuff[2];

IrRecData2 = IrRecBuff[3];

IrRecFlag = 0;

}

}

}

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