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研发客服红外接收程序。适用于市场上用量最大的NEC编码。
应用层查询 B_IR_Press标志为,则已接收到一个键码放在IR_code中, 处理完键码后， 用户程序清除B_IR_Press标志
数码管左起4位显示用户码, 最右边两位显示数据, 均为十六进制.
#define MAIN_Fosc 22118400L //定义主时钟
#define SysTick 10000 // 次/秒, 系统滴答频率, 在4000~16000之间
#include "STC15Fxxxx.H"
#define DIS_DOT 0x20
#define DIS_BLACK 0x10
#define DIS_ 0x11
#define Timer0_Reload (65536UL - ((MAIN_Fosc + SysTick/2) / SysTick)) //Timer 0 中断频率, 在config.h中指定系统滴答频率, 在4000~16000之间.
u8 code t_display[]={ //标准字库
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black - H J K L N o P U t G Q r M y
0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46}; //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1
u8 code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; //位码
sbit P_HC595_SER = P4^0; //pin 14 SER data input
sbit P_HC595_RCLK = P5^4; //pin 12 RCLk store (latch) clock
sbit P_HC595_SRCLK = P4^3; //pin 11 SRCLK Shift data clock
u8 LED8[8]; //显示缓冲
u8 display_index; //显示位索引
bit B_1ms; //1ms标志
u8 cnt_1ms; //1ms基本计时
sbit P_IR_RX = P3^6; //定义红外接收输入IO口
u8 IR_SampleCnt; //采样计数
u8 IR_BitCnt; //编码位数
u8 IR_UserH; //用户码(地址)高字节
u8 IR_UserL; //用户码(地址)低字节
u8 IR_data; //数据原码
u8 IR_DataShit; //数据移位
bit P_IR_RX_temp; //Last sample
bit B_IR_Sync; //已收到同步标志
bit B_IR_Press; //安键动作发生
u8 IR_code; //红外键码
u16 UserCode; //用户码
void main(void)
{
u8 i;
P0M1 = 0; P0M0 = 0; //设置为准双向口
P1M1 = 0; P1M0 = 0; //设置为准双向口
P2M1 = 0; P2M0 = 0; //设置为准双向口
P3M1 = 0; P3M0 = 0; //设置为准双向口
P4M1 = 0; P4M0 = 0; //设置为准双向口
P5M1 = 0; P5M0 = 0; //设置为准双向口
P6M1 = 0; P6M0 = 0; //设置为准双向口
P7M1 = 0; P7M0 = 0; //设置为准双向口
display_index = 0;
AUXR = 0x80; //Timer0 set as 1T, 16 bits timer auto-reload,
TH0 = (u8)(Timer0_Reload / 256);
TL0 = (u8)(Timer0_Reload % 256);
ET0 = 1; //Timer0 interrupt enable
TR0 = 1; //Tiner0 run
cnt_1ms = SysTick / 1000;
EA = 1; //打开总中断
for(i=0; i<8; i++) LED8[i] = DIS_;
LED8[4] = DIS_BLACK;
LED8[5] = DIS_BLACK;
while(1)
{
if(B_1ms) //1ms到
{
B_1ms = 0;
if(B_IR_Press) //检测到收到红外键码
{
B_IR_Press = 0；
LED8[0] = (u8)((UserCode >> 12) & 0x0f); //用户码高字节的高半字节
LED8[1] = (u8)((UserCode >> 8) & 0x0f); //用户码高字节的低半字节
LED8[2] = (u8)((UserCode >> 4) & 0x0f); //用户码低字节的高半字节
LED8[3] = (u8)(UserCode & 0x0f); //用户码低字节的低半字节
LED8[6] = IR_code >> 4;
LED8[7] = IR_code & 0x0f;
}
}
}
}
/*** 向HC595发送一个字节函数 ***/
void Send_595(u8 dat)
{
u8 i;
for(i=0; i<8; i++)
{
dat <<= 1;
P_HC595_SER = CY;
P_HC595_SRCLK = 1;
P_HC595_SRCLK = 0;
}
}
/*** 显示扫描函数 ***/
void DisplayScan(void)
{
Send_595(~T_COM[display_index]); //输出位码
Send_595(t_display[LED8[display_index]]); //输出段码
P_HC595_RCLK = 1;
P_HC595_RCLK = 0; //锁存输出数据
if(++display_index >= 8) display_index = 0; //8位结束回0
}
//this programme is used for Receive IR Remote (NEC Code).
//data format: Synchro, AddressH, AddressL, data, /data, (total 32 bit).
//send a frame(85ms), pause 23ms, send synchro of continue frame, pause 94ms
//data rate: 108ms/Frame
//Synchro: low=9ms, high=4.5 / 2.25ms, low=0.5626ms
//Bit0: high=0.5626ms, low=0.5626ms
//Bit1: high=1.6879ms, low=0.5626ms
//frame rate = 108ms ( pause 23 ms or 96 ms)
/*红外采样时间宏定义, 不要随意修改 */
#define IR_SAMPLE_TIME (1000000UL/SysTick) //查询时间间隔, us, 红外接收要求在60us~250us之间
#if ((IR_SAMPLE_TIME <= 250) && (IR_SAMPLE_TIME >= 60))
#define D_IR_sample IR_SAMPLE_TIME //定义采样时间，在60us~250us之间
#endif
#define D_IR_SYNC_MAX (15000/D_IR_sample) //SYNC max time
#define D_IR_SYNC_MIN (9700 /D_IR_sample) //SYNC min time
#define D_IR_SYNC_DIVIDE (12375/D_IR_sample) //decide data 0 or 1
#define D_IR_DATA_MAX (3000 /D_IR_sample) //data max time
#define D_IR_DATA_MIN (600 /D_IR_sample) //data min time
#define D_IR_DATA_DIVIDE (1687 /D_IR_sample) //decide data 0 or 1
#define D_IR_BIT_NUMBER 32 //bit number
void IR_RX_NEC(void)
{
u8 SampleTime;
IR_SampleCnt++; //Sample + 1
F0 = P_IR_RX_temp; //Save Last sample status
P_IR_RX_temp = P_IR_RX; //Read current status
if(F0 && !P_IR_RX_temp) //Pre-sample is high，and current sample is low, so is fall edge
{
SampleTime = IR_SampleCnt; //get the sample time
IR_SampleCnt = 0; //Clear the sample counter
if(SampleTime > D_IR_SYNC_MAX) B_IR_Sync = 0; //large the Maxim SYNC time, then error
else if(SampleTime >= D_IR_SYNC_MIN) //SYNC
{
if(SampleTime >= D_IR_SYNC_DIVIDE)
{
B_IR_Sync = 1; //has received SYNC
IR_BitCnt = D_IR_BIT_NUMBER; //Load bit number
}
}
else if(B_IR_Sync) //has received SYNC
{
if(SampleTime > D_IR_DATA_MAX) B_IR_Sync=0; //data samlpe time too large
else
{
IR_DataShit >>= 1; //data shift right 1 bit
if(SampleTime >= D_IR_DATA_DIVIDE) IR_DataShit |= 0x80; //devide data 0 or 1
if(--IR_BitCnt == 0) //bit number is over?
{
B_IR_Sync = 0; //Clear SYNC
if(~IR_DataShit == IR_data) //判断数据正反码
{
UserCode = ((u16)IR_UserH << 8) + IR_UserL;
IR_code = IR_data;
B_IR_Press = 1; //数据有效
}
}
else if((IR_BitCnt & 7)== 0) //one byte receive
{
IR_UserL = IR_UserH; //Save the User code high byte
IR_UserH = IR_data; //Save the User code low byte
IR_data = IR_DataShit; //Save the IR data byte
}
}
}
}
}
void timer0 (void) interrupt TIMER0_VECTOR
{
IR_RX_NEC();
if(--cnt_1ms == 0)
{
cnt_1ms = SysTick / 1000;
B_1ms = 1; //1ms标志
DisplayScan(); //1ms扫描显示一位
}
}
