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/*---------------------------------------------------------------------*/
/* --- STC MCU Limited ------------------------------------------------*/
/* --- STC 1T Series MCU Demo Programme -------------------------------*/
/* 如果要在程序中使用此代碼,請(qǐng)?jiān)诔绦蛑凶⒚魇褂昧薙TC的資料及程序 */
/*---------------------------------------------------------------------*/
/************* 功能說(shuō)明 **************
使用Timer0模擬16通道PWM驅(qū)動(dòng)程序。
輸出為 P1.0 ~ P1.7, P2.0 ~ P2.7, 對(duì)應(yīng) PWM0 ~ PWM15.
定時(shí)器中斷頻率一般不要超過(guò)100KHZ, 留足夠的時(shí)間給別的程序運(yùn)行.
本例子使用11.0592MHZ時(shí)鐘, 25K的中斷頻率, 250級(jí)PWM, 周期為10ms.
中斷里處理的時(shí)間不超過(guò)6us, 占CPU時(shí)間大約為15%.
******************************************/
#include <reg52.h>
#define MAIN_Fosc 11059200UL //定義主時(shí)鐘
#define Timer0_Rate 25000 //中斷頻率
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
sfr AUXR = 0x8E;
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;
#define Timer0_Reload (65536UL -(MAIN_Fosc / Timer0_Rate)) //Timer 0 重裝值
//************** PWM8 變量和常量以及IO口定義 ***************
//******************** 8通道8 bit 軟PWM ********************
#define PWM_DUTY_MAX 250 // 0~255 PWM周期, 最大255
#define PWM_ON 1 // 定義占空比的電平, 1 或 0
#define PWM_OFF (!PWM_ON)
#define PWM_ALL_ON (0xff * PWM_ON)
u8 bdata PWM_temp1,PWM_temp2; //影射一個(gè)RAM，可位尋址，輸出時(shí)同步刷新
sbit P_PWM0 = PWM_temp1^0; // 定義影射RAM每位對(duì)應(yīng)的IO
sbit P_PWM1 = PWM_temp1^1;
sbit P_PWM2 = PWM_temp1^2;
sbit P_PWM3 = PWM_temp1^3;
sbit P_PWM4 = PWM_temp1^4;
sbit P_PWM5 = PWM_temp1^5;
sbit P_PWM6 = PWM_temp1^6;
sbit P_PWM7 = PWM_temp1^7;
sbit P_PWM8 = PWM_temp2^0;
sbit P_PWM9 = PWM_temp2^1;
sbit P_PWM10 = PWM_temp2^2;
sbit P_PWM11 = PWM_temp2^3;
sbit P_PWM12 = PWM_temp2^4;
sbit P_PWM13 = PWM_temp2^5;
sbit P_PWM14 = PWM_temp2^6;
sbit P_PWM15 = PWM_temp2^7;
u8 pwm_duty; //周期計(jì)數(shù)值
u8 pwm[16]; //pwm0~pwm15 為0至15路PWM的寬度值
bit B_1ms;
u8 cnt_1ms;
u8 cnt_20ms;
/**********************************************/
void main(void)
{
u8 i;
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P6M0 = 0x00;
P6M1 = 0x00;
P7M0 = 0x00;
P7M1 = 0x00;
AUXR |= (1<<7); // Timer0 set as 1T mode
TMOD &= ~(1<<2); // Timer0 set as Timer
TMOD &= ~0x03; // Timer0 set as 16 bits Auto Reload
TH0 = Timer0_Reload / 256; //Timer0 Load
TL0 = Timer0_Reload % 256;
ET0 = 1; //Timer0 Interrupt Enable
PT0 = 1; //高優(yōu)先級(jí)
TR0 = 1; //Timer0 Run
EA = 1; //打開(kāi)總中斷
cnt_1ms = Timer0_Rate / 1000; //1ms計(jì)數(shù)
cnt_20ms = 20;
for(i=0; i<16; i++) pwm[i] = i * 15 + 15; //給PWM一個(gè)初值
while(1)
{
if(B_1ms) //1ms到
{
B_1ms = 0;
if(--cnt_20ms == 0) //PWM 20ms改變一階
{
cnt_20ms = 20;
for(i=0; i<16; i++) pwm[i]++;
}
}
}
}
/********************** Timer0 1ms中斷函數(shù) ************************/
void timer0 (void) interrupt 1
{
P1 = PWM_temp1; //影射RAM輸出到實(shí)際的PWM端口
P2 = PWM_temp2;
if(++pwm_duty == PWM_DUTY_MAX) //PWM周期結(jié)束，重新開(kāi)始新的周期
{
pwm_duty = 0;
PWM_temp1 = PWM_ALL_ON;
PWM_temp2 = PWM_ALL_ON;
}
ACC = pwm_duty;
if(ACC == pwm[0]) P_PWM0 = PWM_OFF; //判斷PWM占空比是否結(jié)束
if(ACC == pwm[1]) P_PWM1 = PWM_OFF;
if(ACC == pwm[2]) P_PWM2 = PWM_OFF;
if(ACC == pwm[3]) P_PWM3 = PWM_OFF;
if(ACC == pwm[4]) P_PWM4 = PWM_OFF;
if(ACC == pwm[5]) P_PWM5 = PWM_OFF;
if(ACC == pwm[6]) P_PWM6 = PWM_OFF;
if(ACC == pwm[7]) P_PWM7 = PWM_OFF;
if(ACC == pwm[8]) P_PWM8 = PWM_OFF;
if(ACC == pwm[9]) P_PWM9 = PWM_OFF;
if(ACC == pwm[10]) P_PWM10 = PWM_OFF;
if(ACC == pwm[11]) P_PWM11 = PWM_OFF;
if(ACC == pwm[12]) P_PWM12 = PWM_OFF;
if(ACC == pwm[13]) P_PWM13 = PWM_OFF;
if(ACC == pwm[14]) P_PWM14 = PWM_OFF;
if(ACC == pwm[15]) P_PWM15 = PWM_OFF;
if(--cnt_1ms == 0)
{
cnt_1ms = Timer0_Rate / 1000;
B_1ms = 1; // 1ms標(biāo)志
}
}

復(fù)制代碼

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