29-红外遥控接收程序(NEC码)-数码管显示用户地址和键值，STC32G12K128实验箱演示程序
29-红外遥控接收程序(NEC码)-数码管显示用户地址和键值，STC32G12K128实验箱演示程序，STC32G8K64,STC32CL8K64主程序main.C代码如下（汇编版本在附件中）：
/*---------------------------------------------------------------------*/
/* --- Web: www.STCAI.com ---------------------------------------------*/
/* --- BBS: www.STCAIMCU.com-----------------------------------------*/
/* 如果要在程序中使用此代码,请在程序中注明使用了STC的资料及程序 */
/*---------------------------------------------------------------------*/
/*************功能说明 **************
本例程基于STC32G为主控芯片的实验箱进行编写测试。
使用Keil C251编译器，Memory Model推荐设置XSmall模式，默认定义变量在edata，单时钟存取访问速度快。
edata建议保留1K给堆栈使用，空间不够时可将大数组、不常用变量加xdata关键字定义到xdata空间。
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.
下载时, 选择时钟 24MHz (用户可自行修改频率).
******************************************/
#include "..\..\comm\STC32G.h"
#include "stdio.h"
#include "intrins.h"
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
#define MAIN_Fosc 24000000UL
/****************************** 用户定义宏 ***********************************/
#define SysTick 10000 // 次/秒, 系统滴答频率, 在4000~16000之间
#define Timer0_Reload (65536UL - ((MAIN_Fosc + SysTick/2) / SysTick)) //Timer 0 中断频率
#define DIS_DOT 0x20
#define DIS_BLACK 0x10
#define DIS_ 0x11
/*****************************************************************************/
/*************本地常量声明 **************/
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
/*************本地变量声明 **************/
u8LED8; //显示缓冲
u8display_index;//显示位索引
bit B_1ms; //1ms标志
u8cnt_1ms; //1ms基本计时
/*************红外接收程序变量声明 **************/
sbit P_IR_RX = P3^5; //定义红外接收输入IO口
u8IR_SampleCnt; //采样计数
u8IR_BitCnt; //编码位数
u8IR_UserH; //用户码(地址)高字节
u8IR_UserL; //用户码(地址)低字节
u8IR_data; //数据原码
u8IR_DataShift; //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; //红外接收标志
u8IR_code; //红外键码
u16 UserCode; //用户码
/*************本地函数声明 **************/
/********************* 主函数 *************************/
void main(void)
{
u8i;
WTST = 0;//设置程序指令延时参数，赋值为0可将CPU执行指令的速度设置为最快
EAXFR = 1; //扩展寄存器(XFR)访问使能
CKCON = 0; //提高访问XRAM速度
P0M1 = 0x30; P0M0 = 0x30; //设置P0.4、P0.5为漏极开路(实验箱加了上拉电阻到3.3V)
P1M1 = 0x30; P1M0 = 0x30; //设置P1.4、P1.5为漏极开路(实验箱加了上拉电阻到3.3V)
P2M1 = 0x3c; P2M0 = 0x3c; //设置P2.2~P2.5为漏极开路(实验箱加了上拉电阻到3.3V)
P3M1 = 0x50; P3M0 = 0x50; //设置P3.4、P3.6为漏极开路(实验箱加了上拉电阻到3.3V)
P4M1 = 0x3c; P4M0 = 0x3c; //设置P4.2~P4.5为漏极开路(实验箱加了上拉电阻到3.3V)
P5M1 = 0x0c; P5M0 = 0x0c; //设置P5.2、P5.3为漏极开路(实验箱加了上拉电阻到3.3V)
P6M1 = 0xff; P6M0 = 0xff; //设置为漏极开路(实验箱加了上拉电阻到3.3V)
P7M1 = 0x00; P7M0 = 0x00; //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 = DIS_;
LED8 = DIS_BLACK;
LED8 = 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 = (u8)((UserCode >> 12) & 0x0f); //用户码高字节的高半字节
LED8 = (u8)((UserCode >> 8)& 0x0f); //用户码高字节的低半字节
LED8 = (u8)((UserCode >> 4)& 0x0f); //用户码低字节的高半字节
LED8 = (u8)(UserCode & 0x0f); //用户码低字节的低半字节
LED8 = IR_code >> 4;
LED8 = IR_code & 0x0f;
}
}
}
}
/********************** 显示扫描函数 ************************/
void DisplayScan(void)
{
P7 = ~T_COM;
P6 = ~t_display];
if(++display_index >= 8) display_index = 0;//8位结束回0
}
//*******************************************************************
//*********************** IR Remote Module **************************
//*********************** By(Coody) 2002-8-24 *********************
//*********************** IR Remote Module **************************
//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, 用户不要随意修改*******************/
#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
//*******************************************************************************************
//**************************** IR RECEIVE MODULE ********************************************
void IR_RX_NEC(void)
{
u8SampleTime;
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_DataShift >>= 1; //data shift right 1 bit
if(SampleTime >= D_IR_DATA_DIVIDE)IR_DataShift |= 0x80; //devide data 0 or 1
if(--IR_BitCnt == 0) //bit number is over?
{
B_IR_Sync = 0; //Clear SYNC
if(~IR_DataShift == 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_DataShift; //Save the IR data byte
}
}
}
}
}
/********************** Timer0中断函数 ************************/
void timer0 (void) interrupt 1
{
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
}
}
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