想用IAP 15W4K58S4
芯片做一个PWM输出，占空比为50.8% 频率为13.57KHZ..怎么弄？
下面程序是官方的，有老多地方看不懂，请高手指点下。这个程序可以做到吗？
#include<reg51.h>
#define CYCLE 0X1000L
#define PWMC (*(unsigned int vola
tile xdata*)0xfff0)
#define PWMCH (*(unsigned char volatile xdata*)0xfff0)
#define PWMCl (*(unsigned char volatile xdata*)0xfff1)
#define PWMCKS (*(unsigned char volatile xdata*)0xfff2)
#define PWM2T1 (*(unsigned int volatile xdata*)0xff00)
#define PWM2T1H (*(unsigned char volatile xdata*)0xff00)
#define PWM2T1L (*(unsigned char volatile xdata*)0xff01)
#define PWM2T2 (*(unsigned int volatile xdata*)0xff02)
#define PWM2T2H (*(unsigned char volatile xdata*)0xff02)
#define PWM2T2L (*(unsigned char volatile xdata*)0xff03)
#define PWM2CR (*(unsigned char volatile xdata*)0xff04)
#define PWM3T1 (*(unsigned int volatile xdata*)0xff10)
#define PWM3T1H (*(unsigned char volatile xdata*)0xff10)
#define PWM3T1L (*(unsigned char volatile xdata*)0xff11)
#define PWM3T2 (*(unsigned int volatile xdata*)0xff12)
#define PWM3T2H (*(unsigned char volatile xdata*)0xff12)
#define PWM3T2L (*(unsigned char volatile xdata*)0xff13)
#define PWM3CR (*(unsigned char volatile xdata*)0xff14)
#define PWM4T1 (*(unsigned int volatile xdata*)0xff20)
#define PWM4T1H (*(unsigned char volatile xdata*)0xff20)
#define PWM4T1L (*(unsigned char volatile xdata*)0xff21)
#define PWM4T2 (*(unsigned int volatile xdata*)0xff22)
#define PWM4T2H (*(unsigned char volatile xdata*)0xff22)
#define PWM4T2L (*(unsigned char volatile xdata*)0xff23)
#define PWM4CR (*(unsigned char volatile xdata*)0xff24)
#define PWM5T1 (*(unsigned int volatile xdata*)0xff30)
#define PWM5T1H (*(unsigned char volatile xdata*)0xff30)
#define PWM5T1L (*(unsigned char volatile xdata*)0xff31)
#define PWM5T2 (*(unsigned int volatile xdata*)0xff32)
#define PWM5T2H (*(unsigned char volatile xdata*)0xff32)
#define PWM5T2L (*(unsigned char volatile xdata*)0xff33)
#define PWM5CR (*(unsigned char volatile xdata*)0xff34)
#define PWM6T1 (*(unsigned int volatile xdata*)0xff40)
#define PWM6T1H (*(unsigned char volatile xdata*)0xff40)
#define PWM6T1L (*(unsigned char volatile xdata*)0xff41)
#define PWM6T2 (*(unsigned int volatile xdata*)0xff42)
#define PWM6T2H (*(unsigned char volatile xdata*)0xff42)
#define PWM6T2L (*(unsigned char volatile xdata*)0xff43)
#define PWM6CR (*(unsigned char volatile xdata*)0xff44)
#define PWM7T1 (*(unsigned int volatile xdata*)0xff50)
#define PWM7T1H (*(unsigned char volatile xdata*)0xff50)
#define PWM7T1L (*(unsigned char volatile xdata*)0xff51)
#define PWM7T2 (*(unsigned int volatile xdata*)0xff52)
#define PWM7T2H (*(unsigned char volatile xdata*)0xff52)
#define PWM7T2L (*(unsigned char volatile xdata*)0xff53)
#define PWM7CR (*(unsigned char volatile xdata*)0xff54)
sfr P_SW2=0XBA;
sfr P0M1=0X93;
sfr P0M0=0X94;
sfr P1M1=0X91;
sfr P1M0=0X92;
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;
sfr PWMCFG=0XF1;
sfr PWMCR=0XF5;
sfr PWMIF=0XF6;
sfr PWMFDCR=0XF7;
sbit PWM2=P3^7;
sbit PWM3=P2^1;
sbit PWM4=P2^2;
sbit PWM5=P2^3;
sbit PWM6=P0^7;
sbit PWM7=P0^6;
void PWM_config(void);
void PWM2_SetPwmWide(unsigned short Wide);
void PWM3_SetPwmWide(unsigned short Wide);
void PWM4_SetPwmWide(unsigned short Wide);
void PWM5_SetPwmWide(unsigned short Wide);
void PWM6_SetPwmWide(unsigned short Wide);
void PWM7_SetPwmWide(unsigned short Wide);
void main()
{
PWM_config();
PWM2_SetPwmWide(0);
PWM3_SetPwmWide(1);
PWM4_SetPwmWide(CYCLE);
PWM5_SetPwmWide(CYCLE-1);
PWM6_SetPwmWide(CYCLE/2);
PWM7_SetPwmWide(CYCLE/3);
while(1);
}
void PWM_config(void)
{
P0M0&=~0XC0;
P0M1&=~0XC0;
P0&=~0XC0;
P2M0&=~0X0E;
P2M1&=~0X0E;
P2&=~0X0E;
P3M0&=~0X80;
P3M1&=~0X80;
P3&=~0X80;
P_SW2|=0X80;
PWMCKS=0X00;
PWMC=CYCLE;
PWM2T1=1;
PWM2T2=0;
PWM2CR=0X00;
PWM3T1=1;
PWM3T2=0;
PWM3CR=0X00;
PWM4T1=1;
PWM4T2=0;
PWM4CR=0X00;
PWM5T1=1;
PWM5T2=0;
PWM5CR=0X00;
PWM6T1=1;
PWM6T2=0;
PWM6CR=0X08;
PWM7T1=1;
PWM7T2=0;
PWM7CR=0X08;
PWMCFG=0X00;
PWMCR=0X3F;
PWMCR|=0X80;
P_SW2&=~0X80;
}
void PWM2_SetPwmWide(unsigned short Wide)
{
if(Wide==0)
{
PWMCR&=~0X01;
PWM2=0;
}
else if(Wide==CYCLE)
{
PWMCR&=~0X01;
PWM2=1;
}
else
{
P_SW2|=0X80;
PWM2T1=Wide;
P_SW2&=~0X80;
PWMCR|=0X01;
}
}
高手帮帮忙！！！
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//假设单片机使用内部RC振荡器，为12MHz，没有进行系统时钟分频
//那么系统时钟sysclk就等于12MHz
//根据设置，PWM时钟源就是系统时钟，那么PWM计数一次的时间是：1/12MHz=1/12微秒
//如果PWM波的频率为13.57KHz，那么它的周期是1/13.57KHz=73.692微秒
//73.692/(1/12)=884个PWM计数
//占空比884*50.8%=450
//也就是设置 CYCLE=884； WIDE=450；
//就可得到 13.57KHz 占空比50.8% 的PWM波
#include "STC15W4K.H"
#define uchar unsigned char
#define CYCLE 884 //定义PWM周期(最大值为32767)
#define WIDE 450 //定义高电平时间
sbit P2_2=P2^2; //PWM4第一输出
sbit P3_3=P3^3; //普通输入输出管腿
sbit P1_6=P1^6; //PWM6第一输出
void Delay500ms() //@12.000MHz
{
unsigned char i, j, k;
i = 23;
j = 205;
k = 120;
do
{
do
{
while (--k);
} while (--j);
} while (--i);
}
void port_mode() // 端口模式 将所有端口设置为准双向弱上拉
{
P0M1=0x00; P0M0=0x00;P1M1=0x00; P1M0=0x00;P2M1=0x00; P2M0=0x00;P3M1=0x00; P3M0=0x00;
P4M1=0x00; P4M0=0x00;P5M1=0x00; P5M0=0x00;P6M1=0x00; P6M0=0x00;P7M1=0x00; P7M0=0x00;
}
void main()
{
unsigned char i;
//经过设置后，端口工作模式为 准双向弱上拉
//根据实际需要，设置为强推挽也可以输出PWM波，只是一定要串上电阻
port_mode();//将所有端口初始化为准双向弱上拉
for(i=0; i<3; i++)
{
P1_6=0;
Delay500ms();
P1_6=1;
Delay500ms();
}
//将P_SW2寄存器的最高位置1，
//也就是使能访问外部扩展特殊功能寄存器XSFR，而不是访问外部数据寄存器XRAM
P_SW2|=0x80;
//设置PWM配置寄存器
//其他各位都为1，只有C6INI=0，也就是设置PWM6的初始输出电平为低电平
PWMCFG&=0xEF;
//设置PWM计数器的时钟源为 系统时钟分频，而不是定时器T2溢出，设置为系统时钟的0+1=1分频
PWMCKS=0x00;
//PWM计数器设置计数值
PWMC=CYCLE;
//第一次翻转的计数值
PWM6T1=WIDE;
//第二次翻转的计数值
PWM6T2=0; //52
//PWM输出使能为禁止
//PWM计数器归零中断使能为禁止
//PWM6输出使能位位禁止
PWM6CR=0;
//由于前面已经设置完XSFR，这里设置为禁止访问XSFR
//也就是设置为对外部数据存储器XRAM的访问
P_SW2&=0x0F;
//开启总PWM 波形发生器功能，开启PWM4输出，或者说是使能也可以
PWMCR|=0x90;
while(1);
}
//实测大致上符合要求
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