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/*---------------------------------------------------------------------*/
/* --- STC MCU International Limited ----------------------------------*/
/* --- STC 1T Series MCU Demo Programme -------------------------------*/
/* --- Mobile: (86)13922805190 ----------------------------------------*/
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/* --- QQ: 800003751 -------------------------------------------------*/
/* 如果要在程序中使用此代碼,請(qǐng)?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(shuō)明 **************
讀ADC內(nèi)部基準(zhǔn)計(jì)算MCU的工作電壓, 不需要增加任何硬件零件.
用STC的MCU的IO方式控制74HC595驅(qū)動(dòng)8位數(shù)碼管。
用戶可以修改宏來(lái)選擇時(shí)鐘頻率.
用戶可以在"用戶定義宏"中選擇共陰或共陽(yáng). 推薦盡量使用共陰數(shù)碼管.
使用Timer0的16位自動(dòng)重裝來(lái)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(dòng)定時(shí)于1ms.
右邊4位數(shù)碼管顯示MCU的工作電壓值值.
******************************************/
#define MAIN_Fosc 22118400L //定義主時(shí)鐘
#include "STC15Fxxxx.H"
/***********************************************************/
#define DIS_DOT 0x20
#define DIS_BLACK 0x10
#define DIS_ 0x11
#define P1n_pure_input(bitn) P1M1 |= (bitn), P1M0 &= ~(bitn)
/****************************** 用戶定義宏 ***********************************/
#define LED_TYPE 0x00 //定義LED類(lèi)型, 0x00--共陰, 0xff--共陽(yáng)
#define Timer0_Reload (65536UL -(MAIN_Fosc / 1000)) //Timer 0 中斷頻率, 1000次/秒
/*****************************************************************************/
/************* 本地常量聲明 **************/
u8 code t_display[]={ //標(biāo)準(zhǔn)字庫(kù)
// 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 msecond;
u16 Get_ADC10bitResult(u8 channel); //channel = 0~7
/**********************************************/
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 = 0; //對(duì)內(nèi)部基準(zhǔn)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(kāi)總中斷
for(i=0; i<8; i++) LED8[i] = 0x10; //上電消隱
while(1)
{
if(B_1ms) //1ms到
{
B_1ms = 0;
if(++msecond >= 200) //200ms到
{
msecond = 0;
for(j=0,i=0; i<16; i++) j += Get_ADC10bitResult(0); //讀內(nèi)部基準(zhǔn)ADC, P1ASF=0, 讀0通道
j = (u32)128000UL*16 / j; // ADC = 1024 * Uref / Ux, 則 Ux = 1024 * Uref / ADC = 1024 * 1.25 / ADC = 1280 / ADC
LED8[5] = j / 100 + DIS_DOT; //顯示MCU電壓值, 計(jì)算時(shí)放大了100倍, 電壓有兩位小數(shù).
LED8[6] = (j % 100) / 10;
LED8[7] = j % 10;
}
}
}
}
/**********************************************/
//========================================================================
// 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(4);
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));
}
/**************** 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(~LED_TYPE ^ T_COM[display_index]); //輸出位碼
Send_595( LED_TYPE ^ 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
}

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