STC8H系列MCU的PWM做呼吸灯 -

/*---------------------------------------------------------------------*/
/* --- STC MCU Limited ------------------------------------------------*/
/* --- STC 1T Series MCU Demo Programme -------------------------------*/
/* 如果要在程序中使用此代码,请在程序中注明使用了STC的资料及程序 */
/*---------------------------------------------------------------------*/
/************* 功能说明 **************
本例程基于STC8H8K64U为主控芯片的实验箱9进行编写测试，STC8H系列芯片可通用参考.
高级PWM定时器 PWM1P/PWM1N,PWM2P/PWM2N,PWM3P/PWM3N,PWM4P/PWM4N 每个通道都可独立实现PWM输出，或者两两互补对称输出.
8个通道PWM设置对应P6的8个端口.
通过P6口上连接的8个LED灯，利用PWM实现呼吸灯效果.
PWM周期和占空比可以根据需要自行设置，最高可达65535.
下载时, 选择时钟 24MHZ (用户可自行修改频率).
******************************************/
#include "stc8h.h" //包含此头文件后，不需要再包含"reg51.h"头文件
#include "intrins.h"
#define MAIN_Fosc 24000000L //定义主时钟
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
/****************************** 用户定义宏 ***********************************/
#define Timer0_Reload (65536UL -(MAIN_Fosc / 1000)) //Timer 0 中断频率, 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 //设置周期值
/************* 本地变量声明 **************/
bit B_1ms; //1ms标志
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);
/******************** 主函数 **************************/
void main(void)
{
P_SW2 |= 0x80; //扩展寄存器(XFR)访问使能
P0M1 = 0x30; P0M0 = 0x30; //设置P0.4、P0.5为漏极开路(实验箱加了上拉电阻到3.3V)
P1M1 = 0x30; P1M0 = 0x30; //设置P1.4、P1.5为漏极开路(实验箱加了上拉电阻到3.3V)
P2M1 = 0x3c; P2M0 = 0x3c; //设置P2.2~P2.5为漏极开路(实验箱加了上拉电阻到3.3V)
P3M1 = 0x50; P3M0 = 0x50; //设置P3.4、P3.6为漏极开路(实验箱加了上拉电阻到3.3V)
P4M1 = 0x3c; P4M0 = 0x3c; //设置P4.2~P4.5为漏极开路(实验箱加了上拉电阻到3.3V)
P5M1 = 0x0c; P5M0 = 0x0c; //设置P5.2、P5.3为漏极开路(实验箱加了上拉电阻到3.3V)
P6M1 = 0xff; P6M0 = 0xff; //设置为漏极开路(实验箱加了上拉电阻到3.3V)
P7M1 = 0x00; P7M0 = 0x00; //设置为准双向口
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; //写 CCMRx 前必须先清零 CCxE 关闭通道
PWMA_CCER2 = 0x00;
PWMA_CCMR1 = 0x68; //通道模式配置
PWMA_CCMR2 = 0x68;
PWMA_CCMR3 = 0x68;
PWMA_CCMR4 = 0x68;
PWMA_CCER1 = 0x55; //配置通道输出使能和极性
PWMA_CCER2 = 0x55;
PWMA_ARRH = (u8)(PWM_PERIOD >> 8); //设置周期时间
PWMA_ARRL = (u8)PWM_PERIOD;
PWMA_ENO = 0x00;
PWMA_ENO |= ENO1P; //使能输出
PWMA_ENO |= ENO1N; //使能输出
PWMA_ENO |= ENO2P; //使能输出
PWMA_ENO |= ENO2N; //使能输出
PWMA_ENO |= ENO3P; //使能输出
PWMA_ENO |= ENO3N; //使能输出
PWMA_ENO |= ENO4P; //使能输出
PWMA_ENO |= ENO4N; //使能输出
PWMA_PS = 0x00; //高级 PWM 通道输出脚选择位
PWMA_PS |= PWM1_3; //选择 PWM1_3 通道
PWMA_PS |= PWM2_3; //选择 PWM2_3 通道
PWMA_PS |= PWM3_3; //选择 PWM3_3 通道
PWMA_PS |= PWM4_3; //选择 PWM4_3 通道
PWMA_BKR = 0x80; //使能主输出
PWMA_CR1 |= 0x01; //开始计时
P40 = 0; //给LED供电
EA = 1; //打开总中断
while (1)
{
}
}
/********************** Timer0 1ms中断函数 ************************/
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();
}
//========================================================================
// 函数: UpdatePwm(void)
// 描述: 更新PWM占空比.
// 参数: none.
// 返回: none.
// 版本: V1.0, 2012-11-22
//========================================================================
void UpdatePwm(void)
{
PWMA_CCR1H = (u8)(PWM1_Duty >> 8); //设置占空比时间
PWMA_CCR1L = (u8)(PWM1_Duty);
PWMA_CCR2H = (u8)(PWM2_Duty >> 8); //设置占空比时间
PWMA_CCR2L = (u8)(PWM2_Duty);
PWMA_CCR3H = (u8)(PWM3_Duty >> 8); //设置占空比时间
PWMA_CCR3L = (u8)(PWM3_Duty);
PWMA_CCR4H = (u8)(PWM4_Duty >> 8); //设置占空比时间
PWMA_CCR4L = (u8)(PWM4_Duty);
}

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