ir_send.c

一个用MCU将SHARP 遥控码转为NEC码的小程序

/***********项目描述******************************
*本项目的功能：用于将识别到的按键转换为NEC遥控码转发给外围主板
*MCU芯片：AT89S52
*编译环境：KELL-C51
************************************************/

/*****************IC Config***********************
*P0(0-7),P1(0-4)P2(0-7) for KEY input
*P1.0 for send IR code pin
*use isp update
*
*****************IC Config***********************/
#include <reg51.h>
#include <main_define.h>

//#include <AT89x52.H> 

#define XTALO_FRE_XM   12 //4//  4
//#define XTALO_FRE_12M     1

#define uchar unsigned char
#define uint    unsigned int  

//-------ir send pin config------------
#define IR_PIN 0
#define IR_PIN_H  (P1|=(1<<IR_PIN))
#define IR_PIN_L  (P1&=!(1<<IR_PIN))
#define IR_SEND_SYS_CODE             0x7f00 

#define SUPPORT_KEY_SCAN 0

#if SUPPORT_KEY_SCAN
//------------key define------------------
#define KEY_DIGITAL_0    !((P3&0x01)==0x01)//p3.0
#define KEY_DIGITAL_1    !((P3&0x02)==0x02)//   (P3|!(0x01<<3))// p3.1
#define KEY_DIGITAL_2    !((P3&0x04)==0x04) //p3.2
#define KEY_DIGITAL_3    !((P3&0x08)==0x08)// (P3|!(0x01<<5)) // p3.3
#define KEY_DIGITAL_4    !((P3&0x10)==0x10) //p3.4
#define KEY_DIGITAL_5    !((P3&0x20)==0x20)// p3.5
#define KEY_DIGITAL_6    !((P3&0x80)==0x80)//p3.7
#define KEY_DIGITAL_7    !((P1&0x01)==0x01)//p1.0
#define KEY_DIGITAL_8  P2&(1<<0)
#define KEY_DIGITAL_9  P2&(1<<1)
#define KEY_VIDEO         P2&(1<<2)
#define KEY_AUDIO         P2&(1<<3)
#define KEY_CH_UP         P2&(1<<4)
#define KEY_CH_DOWN   P2&(1<<5)
#define KEY_VOL_UP       P2&(1<<6)
#define KEY_VOL_DOWN P2&(1<<7)
#define KEY_POWER        P1&(1<<1)
#define KEY_BACK           P1&(1<<2)
#define KEY_MUTE          P1&(1<<3)
#define KEY_NONE         0xff

//------IR SEND CODE DEFINE--------
#define IR_SEND_DIGITAL_0  0x00
#define IR_SEND_DIGITAL_1  0x01
#define IR_SEND_DIGITAL_2  0x02
#define IR_SEND_DIGITAL_3  0x03
#define IR_SEND_DIGITAL_4  0x04
#define IR_SEND_DIGITAL_5  0x05
#define IR_SEND_DIGITAL_6  0x06
#define IR_SEND_DIGITAL_7  0x07
#define IR_SEND_DIGITAL_8  0x08
#define IR_SEND_DIGITAL_9  0x09
#define IR_SEND_VIDEO         0x0a
#define IR_SEND_AUDIO         0x0b
#define IR_SEND_CH_UP         0x0c
#define IR_SEND_CH_DOWN   0x0d
#define IR_SEND_VOL_UP       0x0e
#define IR_SEND_VOL_DOWN  0x0f
#define IR_SEND_POWER        0x10
#define IR_SEND_BACK           0x11
#define IR_SEND_MUTE           0x12
#endif

//-----timer----------
void delay_xms(uchar i)
{
#if(XTALO_FRE_XM==4)
uint  b=40,a;//XTALO_FREQUENCE/(12000*10),a;
#elif(XTALO_FRE_XM==12)
//uint  b=3*40,a;//XTALO_FREQUENCE/(12000*10),a;
uint  b=3*37,a;//XTALO_FREQUENCE/(12000*10),a;
#endif
         for( a=b*i;a;a--)
		 	;
	//	    for(b=270;b;b--);//A=100 AND B=270 FOR  ms
}
void delay_560us(uchar i)
{ 
#if(XTALO_FRE_XM==4)
uint a, b=20;
#elif(XTALO_FRE_XM==12)
uint a, b=3*20;
#endif

         for( a=i*b;a;a--);
}

#if SUPPORT_KEY_SCAN
//----------------------------------
uchar key_scan(void)
{
if(KEY_DIGITAL_0) 
	return IR_SEND_DIGITAL_0;	 	 
else if(KEY_DIGITAL_1)
	return IR_SEND_DIGITAL_1;
else if(KEY_DIGITAL_2)
	return IR_SEND_DIGITAL_2;
else if(KEY_DIGITAL_3)
	return IR_SEND_DIGITAL_3;
else if(KEY_DIGITAL_4)
	return IR_SEND_DIGITAL_4;
else if(KEY_DIGITAL_5)
	return IR_SEND_DIGITAL_5;
else if(KEY_DIGITAL_6)
	return IR_SEND_DIGITAL_6;
/*
else if(KEY_DIGITAL_7)
	return IR_SEND_DIGITAL_7;
else if(KEY_DIGITAL_8)
	return IR_SEND_DIGITAL_8;
else if(KEY_DIGITAL_9)
	return IR_SEND_DIGITAL_9;
else if(KEY_VIDEO)
	return IR_SEND_VIDEO;
else if(KEY_AUDIO)
	return IR_SEND_AUDIO;
else if(KEY_CH_UP)
	return IR_SEND_CH_UP;
else if(KEY_CH_DOWN)
	return IR_SEND_CH_DOWN;
else if(KEY_VOL_UP)
	return IR_SEND_VOL_UP;
else if(KEY_VOL_DOWN)
	return IR_SEND_VOL_DOWN;
else if(KEY_BACK)
	return IR_SEND_BACK;
else if(KEY_POWER)
	return IR_SEND_POWER;
else if(KEY_MUTE)
	return IR_SEND_MUTE;
*/
else return KEY_NONE;

}
#endif
/*
void mcu_init(void)
{
P0=0xff;
P1=0xff;
P2=0xff;
P3=0xff;
}
*/
void ir_send_code_0_bit()
{
IR_PIN_L;
delay_560us(1);
IR_PIN_H;
delay_560us(1);
}

void ir_send_code_1_bit()
{
IR_PIN_L;
delay_560us(1);
IR_PIN_H;
delay_560us(3);
}

void ir_send_code_one_bit(bit state)
{
if(state) 
	ir_send_code_1_bit();
else 
	ir_send_code_0_bit();
}

void ir_send_start_code(void)
{
IR_PIN_L;
delay_xms(9);
IR_PIN_H;
delay_xms(4);
#if(XTALO_FRE_XM==12)
delay_560us(2);// 20080127 add
#endif
}

void ir_send_stop_code(void)
{
IR_PIN_L;
delay_560us(1);
IR_PIN_H;
//delay_560us(1);
}

void ir_send_sys_code(void)
{
	uchar i;
	bit ir_code_bit;
	for(i=0;i<16;i++)
	{
	ir_code_bit=IR_SEND_SYS_CODE&(0x0001<<i);
	ir_send_code_one_bit(ir_code_bit);
	}
	//反码
}
void ir_send_command_code(uchar command_code)
{
	uchar i;
	bit ir_code_bit;
	for(i=0;i<8;i++)
	{
	ir_code_bit=command_code&(0x01<<i);
	ir_send_code_one_bit(ir_code_bit);
	}
	//反码
	for(i=0;i<8;i++)
	{
	ir_code_bit=command_code&(0x01<<i);
	ir_send_code_one_bit(!ir_code_bit);
	}	
}

bit  ir_send(uchar ir_code)
{
ir_send_start_code();
ir_send_sys_code();
ir_send_command_code(ir_code);
ir_send_stop_code();
return IR_SEND_END;
}