STC單片機(jī)74HC595驅(qū)動8個(gè)數(shù)碼管

ID:187220 · 發(fā)表于 2017-4-7 18:25

74HC595驅(qū)動8個(gè)數(shù)碼管源程序：

/*---------------------------------------------------------------------*/
/* --- STC MCU International Limited ----------------------------------*/
/* --- STC 1T Series MCU Demo Programme -------------------------------*/
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/* --- QQ: 800003751 -------------------------------------------------*/
/* 如果要在程序中使用此代碼,請?jiān)诔绦蛑凶⒚魇褂昧撕昃Э萍嫉馁Y料及程序 */
/*---------------------------------------------------------------------*/
/************* 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(shí)鐘.
使用Timer0的16位自動重裝來產(chǎn)生1ms節(jié)拍,程序運(yùn)行于這個(gè)節(jié)拍下, 用戶修改MCU主時(shí)鐘頻率時(shí),自動定時(shí)于1ms.
******************************************/
#define MAIN_Fosc 22118400L //定義主時(shí)鐘
#include "STC15Fxxxx.H"
/****************************** 用戶定義宏 ***********************************/
#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
/************* 本地常量聲明 **************/
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
/************* IO口定義 **************/
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
/************* 本地變量聲明 **************/
u8 LED8[8]; //顯示緩沖
u8 display_index; //顯示位索引
bit B_1ms; //1ms標(biāo)志
u8 hour,minute,second;
u16 msecond;
/************* 本地函數(shù)聲明 **************/
/**************** 外部函數(shù)聲明和外部變量聲明 *****************/
/********************** 顯示時(shí)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] = DIS_;
LED8[3] = minute / 10;
LED8[4] = minute % 10;
LED8[5] = DIS_;
LED8[6] = second / 10;
LED8[7] = second % 10;
}
/********************** RTC演示函數(shù) ************************/
void RTC(void)
{
if(++second >= 60)
{
second = 0;
if(++minute >= 60)
{
minute = 0;
if(++hour >= 24) hour = 0;
}
}
}
/********************** 主函數(shù) ************************/
void main(void)
{
u8 i,k;
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
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
display_index = 0;
hour = 11; //初始化時(shí)間值
minute = 59;
second = 58;
RTC();
DisplayRTC();
// for(i=0; i<8; i++) LED8[i] = DIS_BLACK; //上電消隱
for(i=0; i<8; i++) LED8[i] = i; //顯示01234567
k = 0;
while(1)
{
if(B_1ms) //1ms到
{
B_1ms = 0;
if(++msecond >= 1000) //1秒到
{
msecond = 0;
RTC();
DisplayRTC();
}
}
}
}
/**********************************************/
/**************** 向HC595發(fā)送一個(gè)字節(jié)函數(shù) ******************/
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;
}
}
/********************** 顯示掃描函數(shù) ************************/
void DisplayScan(void)
{
Send_595(~T_COM[display_index]); //輸出位碼
Send_595(t_display[LED8[display_index]]); //輸出段碼
P_HC595_RCLK = 1;
P_HC595_RCLK = 0; //鎖存輸出數(shù)據(jù)
if(++display_index >= 8) display_index = 0; //8位結(jié)束回0
}
/********************** Timer0 1ms中斷函數(shù) ************************/
void timer0 (void) interrupt TIMER0_VECTOR
{
DisplayScan(); //1ms掃描顯示一位
B_1ms = 1; //1ms標(biāo)志
}