红外调制解调协议stm32源码 -

#include "ir.h"
//[7]:保留
//[6]:保留
//[5]://标记下降沿是否已经被捕获
//[4]://标记上升沿是否已经被捕获
//[3:0]:溢出计时器
u8 key_sta=0;
u16 LOW_value=0;
u16 HIGH_value=0;
u16 ii=0;
u16 tab[500];
u16 IR_RXBUff[500];
//u16 IR_TXBUff[500];
u8 num_b[8] = {0}; //十进制转二进制数组
u16 num_val[16] = {0}; //发送数组
void ir_re_init(void) //IR接收初始化 PA1--TIM5--CH2
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;//上拉输入
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = 0XFFFF; //设定计数器自动重装值最大10ms溢出
TIM_TimeBaseStructure.TIM_Prescaler =(72-1); //预分频器,1M的计数频率,1us加1.
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
TIM_ICInitStructure.TIM_Channel=TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Falling;//下降沿触发
TIM_ICInitStructure.TIM_ICSelection=TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter=0x00;
TIM_ICInit(TIM5,&TIM_ICInitStructure);
TIM_Cmd(TIM5,ENABLE);
NVIC_InitStructure.NVIC_IRQChannel= TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig( TIM5,TIM_IT_CC2,ENABLE);
}
void TIM5_IRQHandler(void) //IR接收中断
{
if(TIM_GetFlagStatus(TIM5, TIM_FLAG_CC2) == SET)//触发中断
{
if(R_DATA==1)
{
if(key_sta&0x20)
{
LOW_value=TIM_GetCapture2(TIM5);
IR_RXBUff[ii]=LOW_value;
ii++;
TIM_SetCounter(TIM5, 0);//清零计数器的值
TIM_OC2PolarityConfig(TIM5, TIM_ICPolarity_Falling);
key_sta&=0xdf;//下降沿捕获清除清除 0x20
}
key_sta|=0x10;//上升沿被成功捕获标记0x10
}
else if(R_DATA==0)
{
if(key_sta&0x10)
{
HIGH_value=TIM_GetCapture2(TIM5);
IR_RXBUff[ii]=HIGH_value;
ii++;
key_sta&=0xef;//上升沿捕获清除清除0x10
}
TIM_SetCounter(TIM5, 0);//清零计数器的值
TIM_OC2PolarityConfig(TIM5, TIM_ICPolarity_Rising);
key_sta|=0x20;//下降沿被成功捕获标记 0x20
}
}
TIM_ClearFlag(TIM5,TIM_IT_CC2);
}
//0为成功
u8 IR_receive_finish(u8 *p) //IR接收完成标志 (此处给的10ms等待)
{
u8 i,j;
u8 val_t = 0;
u16 k=0;
while(ii<=10 && k<50000) //等待开始接收数据,50ms没有收到数据就跳出
{
k++;
delay_us(1);
}
delay_ms(30);
// printf("%d\r\n",ii);
if(ii>20)
{
delay_ms(500);
}
// printf("%d\r\n",ii);
if(ii>=15 && k<50000)
{
for(i=0;i<16;i+=2) //把38k波解调成逻辑0|1 存到一个字节的各个位
{
if((IR_RXBUff[i]>=Half_IR)||(IR_RXBUff[i+1]>=Half_IR))
{
num_b[i/2] = 1;
}
else if((IR_RXBUff[i]<Half_IR)&&(IR_RXBUff[i+1]<Half_IR))
{
num_b[i/2] = 0;
}
}
for(j=0;j<8;j++) //把2进制数变为十进制数
{
if(num_b[j]==1)
{
val_t |= 1<<j;
}
}
*p = val_t;
ii = 0;
key_sta = 0;
return 0;
}
return 1;
}
//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM3_2PWM_Init(u16 arr,u16 psc) //IR -- PWM发射初始化 PA7--TIM3--CH2
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PA7--TIM3--CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值不分频
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse =0; //设置待装入捕获比较寄存器的脉冲值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ; //输出极性:TIM输出比较极性高
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //☆注意这块的通道数的选择☆
TIM_Cmd(TIM3, ENABLE); //使能TIM4
}
void IR_sent(u8 val) //IR发射 (5ms发完16位)
{
u8 jj=0;
u8 i,j,k=0;
//IR发射前要关闭红外接收，防止干扰频繁进中断导致单片机hard fuilt
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,DISABLE); //IR接收初始化 PA1--TIM5--CH2
//IR发射前要关闭红外接收，防止干扰频繁进中断导致单片机hard fuilt
for(i=0;i<8;i++) //把十进制数字变为二进制数字
{
if( ( val&(1<<i) ) )
{
num_b[i] = 1;
}
else
{
num_b[i] = 0;
}
}
//调制数据
for(k=0;k<16;k+=2) //把将二进制的各个位的逻辑0|1加载到38k红外波上 _deflag
{
j=k/2;
if(num_b[j]==1)
{
num_val[k] = L_IR;
num_val[k+1] = H_IR;
}
else if(num_b[j]==0) //为0
{
num_val[k] = L_IR;
num_val[k+1] = L_IR;
}
}
LED0 = 0;
for(jj=0;jj<16;jj+=2) //PWM发射初始化 PA7--TIM3--CH2
{
if(num_val[jj]==0)
{
TIM_SetCompare2(TIM3,0);
}
else
{
if(num_val[jj]!=0)
{
TIM_SetCompare2(TIM3,(1893/3));
delay_us(num_val[jj]);
TIM_SetCompare2(TIM3,0);
if(num_val[(jj+1)]!=0)
{
TIM_SetCompare2(TIM3,0);
delay_us(num_val[(jj+1)]);//程序死在这里了
}
}
}
}
TIM_SetCompare2(TIM3,(1893/3));
delay_us(200);
TIM_SetCompare2(TIM3,0);
//IR发射前要关闭红外接收，防止干扰频繁进中断导致单片机hard fuilt
delay_ms(1); //延时1毫秒下面这句时钟使能才会有效.
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5,ENABLE); //IR接收初始化 PA1--TIM5--CH2
//IR发射前要关闭红外接收，防止干扰频繁进中断导致单片机hard fuilt
LED0 = 1;
}

复制代码