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標題: 單片機紅外NEC解碼代碼 [打印本頁]

作者: 李白不喝酒 時間: 2022-6-29 11:08
標題: 單片機紅外NEC解碼代碼
/*****************************************
*函數名稱：ir_drive
*功          能：NEC紅外解碼
*調用時間：定時器125us中斷
******************************************/
typedef       union{
struct{
unsigned char bit0:1;
unsigned char bit1:1;
unsigned char bit2:1;
unsigned char bit3:1;
unsigned char bit4:1;
unsigned char bit5:1;
unsigned char bit6:1;
unsigned char bit7:1;
}bits;
unsigned char byte;
}bit_struct;

#define ir_io       FP51

volatile bit_struct ir_flag;

volatile unsigned char ir_phase,ir_l_count,ir_h_count,ir_recv_bit_count;
volatile unsigned char ir_buf_tem,ir_buf[4];//[0]地址[1]地址反碼[2]鍵值[3]鍵值反碼

#define       ir_io_stare                      ir_flag.bits.bit0
#define ir_io_stare_old             ir_flag.bits.bit1
#define       ir_ok                               ir_flag.bits.bit2
#define       ir_repeat                      ir_flag.bits.bit3

void ir_drive(void)
{
      ir_io_stare = ir_io;

      if(ir_io_stare)
      {
            if(ir_l_count != 0)
                     ir_h_count++;
      }
      else
      {

            ir_l_count++;
      }

      if(ir_io_stare_old != ir_io_stare)
      {
            ir_io_stare_old = ir_io_stare;
            if(ir_io_stare_old == 0)
            {
                     if(ir_phase == 0)
                     {//9ms低電平+4.5ms高電平
                              if(ir_l_count >= 60)
                              {
                                    if(ir_h_count >= 31)
                                    {//起始碼
                                             ir_phase++;
                                             ir_recv_bit_count = 0;
                                    }
                                    else if(ir_h_count >= 15)
                                    {//重復碼
                                             ir_buf_tem++;
                                             if(ir_buf_tem > 4)
                                             {
                                                      ir_buf_tem = 0;
                                                      ir_repeat = 1;
                                             }
                                    }
                              }
                     }
                     else if(ir_phase == 1)
                     {//解碼,1:560us低電平+1690us高電平
                              if(ir_l_count >= 2)
                              {
                                    ir_buf_tem <<= 1;
                                    if(ir_h_count >= 11)
                                    {
                                             ir_buf_tem++;
                                    }
                                    ir_buf[ir_recv_bit_count/8] = ir_buf_tem;
                                    ir_recv_bit_count++;
                                    if(ir_recv_bit_count == 32)
                                    {
                                             ir_recv_bit_count = 0;
                                             ir_phase = 0;
                                             ir_buf_tem = 0;
                                             ir_ok = 1;
                                    }
                              }
                              else
                                    ir_phase = 0;
                     }
                     ir_h_count = 0;
                     ir_l_count = 0;
            }
      }
}

void ir_task(void)
{
      if(ir_ok)
      {
            ir_ok = 0;

      }
      if(ir_repeat)
      {
            ir_repeat = 0;

      }
}

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