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/************* 本程序功能說明 **************
用STC的MCU的IO方式控制74HC595驅(qū)動8位數(shù)碼管。
顯示效果為: 數(shù)碼時鐘.
使用Timer0的16位自動重裝來產(chǎn)生1ms節(jié)拍,程序運行于這個節(jié)拍下, 用戶修改MCU主時鐘頻率時,自動定時于1ms.
左邊4位LED顯示時間(小時,分鐘), 右邊最后兩位顯示按鍵值.
ADC按鍵鍵碼為1~16.
按鍵只支持單鍵按下, 不支持多鍵同時按下, 那樣將會有不可預(yù)知的結(jié)果.
鍵按下超過1秒后,將以10鍵/秒的速度提供重鍵輸出. 用戶只需要檢測KeyCode是否非0來判斷鍵是否按下.
調(diào)整時間鍵:
鍵碼1: 小時+.
鍵碼2: 小時-.
鍵碼3: 分鐘+.
鍵碼4: 分鐘-.
******************************************/
#include "reg51.h"
#include "intrins.h"
#define MAIN_Fosc 11059200L //定義主時鐘
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
sfr TH2 = 0xD6;
sfr TL2 = 0xD7;
sfr IE2 = 0xAF;
sfr INT_CLKO = 0x8F;
sfr AUXR = 0x8E;
sfr AUXR1 = 0xA2;
sfr P_SW1 = 0xA2;
sfr P_SW2 = 0xBA;
sfr S2CON = 0x9A;
sfr S2BUF = 0x9B;
sfr ADC_CONTR = 0xBC; //帶AD系列
sfr ADC_RES = 0xBD; //帶AD系列
sfr ADC_RESL = 0xBE; //帶AD系列
sfr P1ASF = 0x9D; //只寫，模擬輸入(AD或LVD)選擇
sfr P4 = 0xC0;
sfr P5 = 0xC8;
sfr P6 = 0xE8;
sfr P7 = 0xF8;
sfr P1M1 = 0x91; //PxM1.n,PxM0.n =00--->Standard, 01--->push-pull
sfr P1M0 = 0x92; // =10--->pure input, 11--->open drain
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xB1;
sfr P3M0 = 0xB2;
sfr P4M1 = 0xB3;
sfr P4M0 = 0xB4;
sfr P5M1 = 0xC9;
sfr P5M0 = 0xCA;
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;
sbit P00 = P0^0;
sbit P01 = P0^1;
sbit P02 = P0^2;
sbit P03 = P0^3;
sbit P04 = P0^4;
sbit P05 = P0^5;
sbit P06 = P0^6;
sbit P07 = P0^7;
sbit P10 = P1^0;
sbit P11 = P1^1;
sbit P12 = P1^2;
sbit P13 = P1^3;
sbit P14 = P1^4;
sbit P15 = P1^5;
sbit P16 = P1^6;
sbit P17 = P1^7;
sbit P20 = P2^0;
sbit P21 = P2^1;
sbit P22 = P2^2;
sbit P23 = P2^3;
sbit P24 = P2^4;
sbit P25 = P2^5;
sbit P26 = P2^6;
sbit P27 = P2^7;
sbit P30 = P3^0;
sbit P31 = P3^1;
sbit P32 = P3^2;
sbit P33 = P3^3;
sbit P34 = P3^4;
sbit P35 = P3^5;
sbit P36 = P3^6;
sbit P37 = P3^7;
sbit P40 = P4^0;
sbit P41 = P4^1;
sbit P42 = P4^2;
sbit P43 = P4^3;
sbit P44 = P4^4;
sbit P45 = P4^5;
sbit P46 = P4^6;
sbit P47 = P4^7;
sbit P50 = P5^0;
sbit P51 = P5^1;
sbit P52 = P5^2;
sbit P53 = P5^3;
sbit P54 = P5^4;
sbit P55 = P5^5;
sbit P56 = P5^6;
sbit P57 = P5^7;
#define Timer0_Reload (65536UL -(MAIN_Fosc / 1000)) //Timer 0 中斷頻率, 1000次/秒
#define DIS_DOT 0x20
#define DIS_BLACK 0x10
#define DIS_ 0x11
u8 code t_display[]={ //標(biāo)準(zhǔn)字庫
// 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}; //位碼
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]; //顯示緩沖
u8 display_index; //顯示位索引
bit B_1ms; //1ms標(biāo)志
u8 ADC_KeyState,ADC_KeyState1,ADC_KeyState2,ADC_KeyState3; //鍵狀態(tài)
u8 ADC_KeyHoldCnt; //鍵按下計時
u8 KeyCode; //給用戶使用的鍵碼, 1~16有效
u8 cnt10ms;
u8 hour,minute,second; //RTC變量
u16 msecond;
void CalculateAdcKey(u16 adc);
u16 Get_ADC10bitResult(u8 channel); //channel = 0~7
void DisplayRTC(void);
void RTC(void);
/**********************************************/
void main(void)
{
u8 i;
u16 j;
P0M1 = 0; P0M0 = 0; //設(shè)置為準(zhǔn)雙向口
P1M1 = 0; P1M0 = 0; //設(shè)置為準(zhǔn)雙向口
P2M1 = 0; P2M0 = 0; //設(shè)置為準(zhǔn)雙向口
P3M1 = 0; P3M0 = 0; //設(shè)置為準(zhǔn)雙向口
P4M1 = 0; P4M0 = 0; //設(shè)置為準(zhǔn)雙向口
P5M1 = 0; P5M0 = 0; //設(shè)置為準(zhǔn)雙向口
P6M1 = 0; P6M0 = 0; //設(shè)置為準(zhǔn)雙向口
P7M1 = 0; P7M0 = 0; //設(shè)置為準(zhǔn)雙向口
display_index = 0;
P1ASF = 0x10; //P1.4做ADC
ADC_CONTR = 0xE0; //90T, ADC power on
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
EA = 1; //打開總中斷
for(i=0; i<8; i++) LED8[i] = 0x10; //上電消隱
hour = 12; //初始化時間值
minute = 0;
second = 0;
DisplayRTC();
ADC_KeyState = 0;
ADC_KeyState1 = 0;
ADC_KeyState2 = 0;
ADC_KeyState3 = 0; //鍵狀態(tài)
ADC_KeyHoldCnt = 0; //鍵按下計時
KeyCode = 0; //給用戶使用的鍵碼, 1~16有效
cnt10ms = 0;
while(1)
{
if(B_1ms) //1ms到
{
B_1ms = 0;
if(++msecond >= 1000) //1秒到
{
msecond = 0;
RTC();
DisplayRTC();
}
if(msecond == 500) DisplayRTC(); //小時后的小數(shù)點做秒閃
if(++cnt10ms >= 10) //10ms讀一次ADC
{
cnt10ms = 0;
j = Get_ADC10bitResult(4); //參數(shù)0~7,查詢方式做一次ADC, 返回值就是結(jié)果, == 1024 為錯誤
if(j < 1024) CalculateAdcKey(j); //計算按鍵
}
if(KeyCode > 0) //有鍵按下
{
LED8[6] = KeyCode / 10; //顯示鍵碼
LED8[7] = KeyCode % 10; //顯示鍵碼
if(KeyCode == 1) //hour +1
{
if(++hour >= 24) hour = 0;
DisplayRTC();
}
if(KeyCode == 2) //hour -1
{
if(--hour >= 24) hour = 23;
DisplayRTC();
}
if(KeyCode == 3) //minute +1
{
second = 0;
if(++minute >= 60) minute = 0;
DisplayRTC();
}
if(KeyCode == 4) //minute -1
{
second = 0;
if(--minute >= 60) minute = 59;
DisplayRTC();
}
KeyCode = 0;
}
}
}
}
/**********************************************/
/********************** 顯示時鐘函數(shù) ************************/
void DisplayRTC(void)
{
if(hour >= 10) LED8[0] = hour / 10;
else LED8[0] = DIS_BLACK;
LED8[1] = hour % 10;
LED8[2] = minute / 10;
LED8[3] = minute % 10;
if(msecond >= 500) LED8[1] |= DIS_DOT; //小時后的小數(shù)點做秒閃
}
/********************** RTC演示函數(shù) ************************/
void RTC(void)
{
if(++second >= 60)
{
second = 0;
if(++minute >= 60)
{
minute = 0;
if(++hour >= 24) hour = 0;
}
}
}
//========================================================================
// 函數(shù): u16 Get_ADC10bitResult(u8 channel)
// 描述: 查詢法讀一次ADC結(jié)果.
// 參數(shù): channel: 選擇要轉(zhuǎn)換的ADC.
// 返回: 10位ADC結(jié)果.
// 版本: V1.0, 2012-10-22
//========================================================================
u16 Get_ADC10bitResult(u8 channel) //channel = 0~7
{
ADC_RES = 0;
ADC_RESL = 0;
ADC_CONTR = (ADC_CONTR & 0xe0) | 0x08 | channel; //start the ADC
_nop_();
_nop_();
_nop_();
_nop_();
while((ADC_CONTR & 0x10) == 0) ; //wait for ADC finish
ADC_CONTR &= ~0x10; //清除ADC結(jié)束標(biāo)志
return (((u16)ADC_RES << 2) | (ADC_RESL & 3));
}
/***************** ADC鍵盤計算鍵碼 *****************************
電路和軟件算法設(shè)計: Coody
本ADC鍵盤方案在很多實際產(chǎn)品設(shè)計中, 驗證了其穩(wěn)定可靠, 即使按鍵使用導(dǎo)電膜,都很可靠.
16個鍵,理論上各個鍵對應(yīng)的ADC值為 (1024 / 16) * k = 64 * k, k = 1 ~ 16, 特別的, k=16時,對應(yīng)的ADC值是1023.
但是實際會有偏差,則判斷時限制這個偏差, ADC_OFFSET為+-偏差, 則ADC值在 (64*k-ADC_OFFSET) 與 (64*k+ADC_OFFSET)之間為鍵有效.
間隔一定的時間,就采樣一次ADC,比如10ms.
為了避免偶然的ADC值誤判, 或者避免ADC在上升或下降時誤判, 使用連續(xù)3次ADC值均在偏差范圍內(nèi)時, ADC值才認(rèn)為有效.
以上算法, 能保證讀鍵非�？煽�.
**********************************************/
#define ADC_OFFSET 16
void CalculateAdcKey(u16 adc)
{
u8 i;
u16 j;
if(adc < (64-ADC_OFFSET))
{
ADC_KeyState = 0; //鍵狀態(tài)歸0
ADC_KeyHoldCnt = 0;
}
j = 64;
for(i=1; i<=16; i++)
{
if((adc >= (j - ADC_OFFSET)) && (adc <= (j + ADC_OFFSET))) break; //判斷是否在偏差范圍內(nèi)
j += 64;
}
ADC_KeyState3 = ADC_KeyState2;
ADC_KeyState2 = ADC_KeyState1;
if(i > 16) ADC_KeyState1 = 0; //鍵無效
else //鍵有效
{
ADC_KeyState1 = i;
if((ADC_KeyState3 == ADC_KeyState2) && (ADC_KeyState2 == ADC_KeyState1) &&
(ADC_KeyState3 > 0) && (ADC_KeyState2 > 0) && (ADC_KeyState1 > 0))
{
if(ADC_KeyState == 0) //第一次檢測到
{
KeyCode = i; //保存鍵碼
ADC_KeyState = i; //保存鍵狀態(tài)
ADC_KeyHoldCnt = 0;
}
if(ADC_KeyState == i) //連續(xù)檢測到同一鍵按著
{
if(++ADC_KeyHoldCnt >= 100) //按下1秒后,以10次每秒的速度Repeat Key
{
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