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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,請在程序中注明使用了STC的資料及程序 */
/*---------------------------------------------------------------------*/
/************* 功能說明 **************
本例程基于STC8H8K64U為主控芯片的實驗箱9進行編寫測試，STC8H系列芯片可通用參考.
高級PWM定時器 PWM1P/PWM1N,PWM2P/PWM2N,PWM3P/PWM3N,PWM4P/PWM4N 每個通道都可獨立實現(xiàn)PWM輸出，或者兩兩互補對稱輸出.
8個通道PWM設置對應P6的8個端口.
通過P6口上連接的8個LED燈，利用PWM實現(xiàn)呼吸燈效果.
PWM周期和占空比可以根據(jù)需要自行設置，最高可達65535.
下載時, 選擇時鐘 24MHZ (用戶可自行修改頻率).
******************************************/
#include "stc8h.h" //包含此頭文件后，不需要再包含"reg51.h"頭文件
#include "intrins.h"
#define MAIN_Fosc 24000000L //定義主時鐘
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
/****************************** 用戶定義宏 ***********************************/
#define Timer0_Reload (65536UL -(MAIN_Fosc / 1000)) //Timer 0 中斷頻率, 1000次/秒
/*****************************************************************************/
#define PWM1_1 0x00 //P:P1.0 N:P1.1
#define PWM1_2 0x01 //P:P2.0 N:P2.1
#define PWM1_3 0x02 //P:P6.0 N:P6.1
#define PWM2_1 0x00 //P:P1.2/P5.4 N:P1.3
#define PWM2_2 0x04 //P:P2.2 N:P2.3
#define PWM2_3 0x08 //P:P6.2 N:P6.3
#define PWM3_1 0x00 //P:P1.4 N:P1.5
#define PWM3_2 0x10 //P:P2.4 N:P2.5
#define PWM3_3 0x20 //P:P6.4 N:P6.5
#define PWM4_1 0x00 //P:P1.6 N:P1.7
#define PWM4_2 0x40 //P:P2.6 N:P2.7
#define PWM4_3 0x80 //P:P6.6 N:P6.7
#define PWM4_4 0xC0 //P:P3.4 N:P3.3
#define ENO1P 0x01
#define ENO1N 0x02
#define ENO2P 0x04
#define ENO2N 0x08
#define ENO3P 0x10
#define ENO3N 0x20
#define ENO4P 0x40
#define ENO4N 0x80
#define PWM_PERIOD 1023 //設置周期值
/************* 本地變量聲明 **************/
bit B_1ms; //1ms標志
u16 PWM1_Duty;
u16 PWM2_Duty;
u16 PWM3_Duty;
u16 PWM4_Duty;
bit PWM1_Flag;
bit PWM2_Flag;
bit PWM3_Flag;
bit PWM4_Flag;
void UpdatePwm(void);
/******************** 主函數(shù) **************************/
void main(void)
{
P_SW2 |= 0x80; //擴展寄存器(XFR)訪問使能
P0M1 = 0x30; P0M0 = 0x30; //設置P0.4、P0.5為漏極開路(實驗箱加了上拉電阻到3.3V)
P1M1 = 0x30; P1M0 = 0x30; //設置P1.4、P1.5為漏極開路(實驗箱加了上拉電阻到3.3V)
P2M1 = 0x3c; P2M0 = 0x3c; //設置P2.2~P2.5為漏極開路(實驗箱加了上拉電阻到3.3V)
P3M1 = 0x50; P3M0 = 0x50; //設置P3.4、P3.6為漏極開路(實驗箱加了上拉電阻到3.3V)
P4M1 = 0x3c; P4M0 = 0x3c; //設置P4.2~P4.5為漏極開路(實驗箱加了上拉電阻到3.3V)
P5M1 = 0x0c; P5M0 = 0x0c; //設置P5.2、P5.3為漏極開路(實驗箱加了上拉電阻到3.3V)
P6M1 = 0xff; P6M0 = 0xff; //設置為漏極開路(實驗箱加了上拉電阻到3.3V)
P7M1 = 0x00; P7M0 = 0x00; //設置為準雙向口
PWM1_Flag = 0;
PWM2_Flag = 0;
PWM3_Flag = 0;
PWM4_Flag = 0;
PWM1_Duty = 0;
PWM2_Duty = 256;
PWM3_Duty = 512;
PWM4_Duty = 1024;
// Timer0初始化
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
PWMA_CCER1 = 0x00; //寫 CCMRx 前必須先清零 CCxE 關閉通道
PWMA_CCER2 = 0x00;
PWMA_CCMR1 = 0x68; //通道模式配置
PWMA_CCMR2 = 0x68;
PWMA_CCMR3 = 0x68;
PWMA_CCMR4 = 0x68;
PWMA_CCER1 = 0x55; //配置通道輸出使能和極性
PWMA_CCER2 = 0x55;
PWMA_ARRH = (u8)(PWM_PERIOD >> 8); //設置周期時間
PWMA_ARRL = (u8)PWM_PERIOD;
PWMA_ENO = 0x00;
PWMA_ENO |= ENO1P; //使能輸出
PWMA_ENO |= ENO1N; //使能輸出
PWMA_ENO |= ENO2P; //使能輸出
PWMA_ENO |= ENO2N; //使能輸出
PWMA_ENO |= ENO3P; //使能輸出
PWMA_ENO |= ENO3N; //使能輸出
PWMA_ENO |= ENO4P; //使能輸出
PWMA_ENO |= ENO4N; //使能輸出
PWMA_PS = 0x00; //高級 PWM 通道輸出腳選擇位
PWMA_PS |= PWM1_3; //選擇 PWM1_3 通道
PWMA_PS |= PWM2_3; //選擇 PWM2_3 通道
PWMA_PS |= PWM3_3; //選擇 PWM3_3 通道
PWMA_PS |= PWM4_3; //選擇 PWM4_3 通道
PWMA_BKR = 0x80; //使能主輸出
PWMA_CR1 |= 0x01; //開始計時
P40 = 0; //給LED供電
EA = 1; //打開總中斷
while (1)
{
}
}
/********************** Timer0 1ms中斷函數(shù) ************************/
void timer0(void) interrupt 1
{
if(!PWM1_Flag)
{
PWM1_Duty++;
if(PWM1_Duty > PWM_PERIOD) PWM1_Flag = 1;
}
else
{
PWM1_Duty--;
if(PWM1_Duty <= 0) PWM1_Flag = 0;
}
if(!PWM2_Flag)
{
PWM2_Duty++;
if(PWM2_Duty > PWM_PERIOD) PWM2_Flag = 1;
}
else
{
PWM2_Duty--;
if(PWM2_Duty <= 0) PWM2_Flag = 0;
}
if(!PWM3_Flag)
{
PWM3_Duty++;
if(PWM3_Duty > PWM_PERIOD) PWM3_Flag = 1;
}
else
{
PWM3_Duty--;
if(PWM3_Duty <= 0) PWM3_Flag = 0;
}
if(!PWM4_Flag)
{
PWM4_Duty++;
if(PWM4_Duty > PWM_PERIOD) PWM4_Flag = 1;
}
else
{
PWM4_Duty--;
if(PWM4_Duty <= 0) PWM4_Flag = 0;
}
UpdatePwm();
}
//========================================================================
// 函數(shù): UpdatePwm(void)
// 描述: 更新PWM占空比.
// 參數(shù): none.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void UpdatePwm(void)
{
PWMA_CCR1H = (u8)(PWM1_Duty >> 8); //設置占空比時間
PWMA_CCR1L = (u8)(PWM1_Duty);
PWMA_CCR2H = (u8)(PWM2_Duty >> 8); //設置占空比時間
PWMA_CCR2L = (u8)(PWM2_Duty);
PWMA_CCR3H = (u8)(PWM3_Duty >> 8); //設置占空比時間
PWMA_CCR3L = (u8)(PWM3_Duty);
PWMA_CCR4H = (u8)(PWM4_Duty >> 8); //設置占空比時間
PWMA_CCR4L = (u8)(PWM4_Duty);
}

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