24-高级PWM5-PWM6-PWM7-PWM8输出测试程序，STC8H8K64U实验箱演示程序, STC8H2K32U, ST
24-高级PWM5-PWM6-PWM7-PWM8输出测试程序，STC8H8K64U实验箱演示程序, STC8H2K32U, STC8H2K12U, STC8H主程序main.C代码如下（汇编版本在附件中）：
/*---------------------------------------------------------------------*/
/* --- Web: www.STCAI.com ---------------------------------------------*/
/* --- BBS: www.STCAIMCU.com-----------------------------------------*/
/* 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 PWM5,PWM6,PWM7,PWM8 每个通道都可独立实现PWM输出.
4个通道PWM根据需要设置对应输出口，可通过示波器观察输出的信号.
PWM周期和占空比可以自定义设置，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 PWM5_1 0x00 //P2.0
#define PWM5_2 0x01 //P1.7
#define PWM5_3 0x02 //P0.0
#define PWM5_4 0x03 //P7.4
#define PWM6_1 0x00 //P2.1
#define PWM6_2 0x04 //P5.4
#define PWM6_3 0x08 //P0.1
#define PWM6_4 0x0C //P7.5
#define PWM7_1 0x00 //P2.2
#define PWM7_2 0x10 //P3.3
#define PWM7_3 0x20 //P0.2
#define PWM7_4 0x30 //P7.6
#define PWM8_1 0x00 //P2.3
#define PWM8_2 0x40 //P3.4
#define PWM8_3 0x80 //P0.3
#define PWM8_4 0xC0 //P7.7
#define ENO5P 0x01
#define ENO6P 0x04
#define ENO7P 0x10
#define ENO8P 0x40
#define PWM_PERIOD1023 //设置周期值
/***************************** 本地变量声明 **********************************/
bit B_1ms; //1ms标志
u16 PWM5_Duty;
u16 PWM6_Duty;
u16 PWM7_Duty;
u16 PWM8_Duty;
bit PWM5_Flag;
bit PWM6_Flag;
bit PWM7_Flag;
bit PWM8_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
PWM5_Flag = 0;
PWM6_Flag = 0;
PWM7_Flag = 0;
PWM8_Flag = 0;
PWM5_Duty = 0;
PWM6_Duty = 256;
PWM7_Duty = 512;
PWM8_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
PWMB_CCER1 = 0x00; //写 CCMRx 前必须先清零 CCxE 关闭通道
PWMB_CCER2 = 0x00;
PWMB_CCMR1 = 0x60; //通道模式配置
PWMB_CCMR2 = 0x60;
PWMB_CCMR3 = 0x60;
PWMB_CCMR4 = 0x60;
PWMB_CCER1 = 0x33; //配置通道输出使能和极性
PWMB_CCER2 = 0x33;
PWMB_CCMR1 |= 0x08; //开启PWMB_CCRx预装载功能(需要CCxE=1才可写)
PWMB_CCMR2 |= 0x08;
PWMB_CCMR3 |= 0x08;
PWMB_CCMR4 |= 0x08;
PWMB_ARRH = (u8)(PWM_PERIOD >> 8); //设置周期时间
PWMB_ARRL = (u8)PWM_PERIOD;
PWMB_ENO = 0x00;
PWMB_ENO |= ENO5P; //使能输出
PWMB_ENO |= ENO6P; //使能输出
PWMB_ENO |= ENO7P; //使能输出
PWMB_ENO |= ENO8P; //使能输出
PWMB_PS = 0x00; //高级 PWM 通道输出脚选择位
PWMB_PS |= PWM5_1; //选择 PWM5_1 通道
PWMB_PS |= PWM6_1; //选择 PWM6_1 通道
PWMB_PS |= PWM7_1; //选择 PWM7_1 通道
PWMB_PS |= PWM8_1; //选择 PWM8_1 通道
PWMB_BKR = 0x80; //使能主输出
PWMB_CR1 |= 0x01;//开始计时
EA = 1; //打开总中断
while (1)
{
}
}
/********************** Timer0 1ms中断函数 ************************/
void timer0(void) interrupt 1
{
if(!PWM5_Flag)
{
PWM5_Duty++;
if(PWM5_Duty > PWM_PERIOD) PWM5_Flag = 1;
}
else
{
PWM5_Duty--;
if(PWM5_Duty <= 0) PWM5_Flag = 0;
}
if(!PWM6_Flag)
{
PWM6_Duty++;
if(PWM6_Duty > PWM_PERIOD) PWM6_Flag = 1;
}
else
{
PWM6_Duty--;
if(PWM6_Duty <= 0) PWM6_Flag = 0;
}
if(!PWM7_Flag)
{
PWM7_Duty++;
if(PWM7_Duty > PWM_PERIOD) PWM7_Flag = 1;
}
else
{
PWM7_Duty--;
if(PWM7_Duty <= 0) PWM7_Flag = 0;
}
if(!PWM8_Flag)
{
PWM8_Duty++;
if(PWM8_Duty > PWM_PERIOD) PWM8_Flag = 1;
}
else
{
PWM8_Duty--;
if(PWM8_Duty <= 0) PWM8_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)
{
PWMB_CCR5H = (u8)(PWM5_Duty >> 8); //设置占空比时间
PWMB_CCR5L = (u8)(PWM5_Duty);
PWMB_CCR6H = (u8)(PWM6_Duty >> 8); //设置占空比时间
PWMB_CCR6L = (u8)(PWM6_Duty);
PWMB_CCR7H = (u8)(PWM7_Duty >> 8); //设置占空比时间
PWMB_CCR7L = (u8)(PWM7_Duty);
PWMB_CCR8H = (u8)(PWM8_Duty >> 8); //设置占空比时间
PWMB_CCR8L = (u8)(PWM8_Duty);
}
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