Naruwan板 用PWM控制LED 這次和上次比較 少了閃爍 因為PWM的頻率變快了
程式如下 此程式由笙泉的範例程式修改而來 如有侵權 請告知會立即刪除
///////////////////////////////////////////////////
//
// FILE: PWM_Demo.c
// AUTHOR: Neo (Hsin-Chih Lin)
// COPYRIGHT: (c) Megawin Technology Co., Ltd.
//
///////////////////////////////////////////////////
#include "REG_MPC82G516.H"
void Init_PWM();
void Set_Frequency(char mod_freq);
void Set_Duty(unsigned char module,unsigned int mod_timer);
///////////////////////////////////////////////////
//
// Function:Main()
// Purpose :PWM demo software
// (Pulse Width Modulator)
//
///////////////////////////////////////////////////
void delay5ms()
{
unsigned int j;
for(j=0;j<4978;j++) ;
}
void Main()
{
unsigned int i;
unsigned char iro_cnt=0x01;
Init_PWM();
Set_Frequency(0xf0);
CCON |= 0x40; //Start PCA Counter
TR0 = 1; //Start Timer_0 Counter
while(1)
{
while (iro_cnt==0x01)
{
for(i=0;i<0xff;i++)
{
Set_Duty(0,i);
Set_Duty(1,0xff-i);
delay5ms();
delay5ms();
delay5ms();
delay5ms();
}
for(i=0xff;i>0;i--)
{
Set_Duty(0,i);
Set_Duty(1,0xff-i);
delay5ms();
delay5ms();
delay5ms();
delay5ms();
}
iro_cnt=0x02;
}
while (iro_cnt==0x02)
{
for(i=0;i<0xff;i++)
{
Set_Duty(1,0xff-i);
Set_Duty(2,i);
delay5ms();
delay5ms();
delay5ms();
delay5ms();
}
for(i=0xff;i>0;i--)
{
Set_Duty(1,0xff-i);
Set_Duty(2,i);
delay5ms();
delay5ms();
delay5ms();
delay5ms();
}
iro_cnt=0x03;
}
while (iro_cnt==0x03)
{
for(i=0;i<0xff;i++)
{
Set_Duty(0,i);
Set_Duty(2,0xff-i);
delay5ms();
delay5ms();
delay5ms();
delay5ms();
}
for(i=0xff;i>0;i--)
{
Set_Duty(0,i);
Set_Duty(2,0xff-i);
delay5ms();
delay5ms();
delay5ms();
delay5ms();
}
iro_cnt=0x01;
}
}
}
///////////////////////////////////////////////////
//
// Function:Init_PWM()
// Purpose :Initial PWM parameter
//
///////////////////////////////////////////////////
void Init_PWM()
{
// CMOD = 0x00; //Set PCA Mode (PCA clock source as OSC/12)
// CMOD = 0x02; //Set PCA Mode (PCA clock source as OSC/2)
CMOD = 0x04; //Set PCA Mode (PCA clock source as Timer 0-Overflow)
// CMOD = 0x06; //Set PCA Mode (PCA clock source as ECI(P3.4))
CCAPM0 = 0x42; //Configure PCA Module0 to PWM
CCAPM1 = 0x42; //Configure PCA Module1 to PWM
CCAPM2 = 0x42; //Configure PCA Module2 to PWM
// CCAPM3 = 0x42; //Configure PCA Module3 to PWM
// CCAPM4 = 0x42; //Configure PCA Module4 to PWM(Only for MPC82G516)
// CCAPM5 = 0x42; //Configure PCA Module5 to PWM(Only for MPC82G516)
TMOD = 0x02; //Set Timer 0 Mode to Mode2(Auto load TH to TL when overflow)
AUXR2 = 0x80; //T0x12 Frequency * 12
}
///////////////////////////////////////////////////
//
// Function:Set_Frequency(char mod_freq)
// Params.:
// mod_freq:
// You can setup frequency from
// 30Hz(mod_freq = 0) to
// 93.7KHz(mod_freq = 0xff, AUXR(2) = 0x80)
//
///////////////////////////////////////////////////
void Set_Frequency(char mod_freq)
{
TH0 = mod_freq; //Set Timer 0 Clock Start
}
///////////////////////////////////////////////////
//
// Function:Set_Duty(char module,char mod_timer)
// Parames:
// module:
// Select which module do you want set.(0-5)
//
// mod_timer:
// Set duty length.(0-0x100)
// 0x0000 is all output high,
// 0x0100 is all output low
//
///////////////////////////////////////////////////
void Set_Duty(unsigned char module,unsigned int mod_timer)
{
switch(module)
{
case 0:
PCAPWM0 = (unsigned char) (mod_timer&0x0100) << 1;
CCAP0H = mod_timer;
break;
case 1:
PCAPWM1 = (unsigned char) (mod_timer&0x0100) << 1;
CCAP1H = mod_timer;
break;
case 2:
PCAPWM2 = (unsigned char) (mod_timer&0x0100) << 1;
CCAP2H = mod_timer;
break;
case 3:
PCAPWM3 = (unsigned char) (mod_timer&0x0100) << 1;
CCAP3H = mod_timer;
break;
case 4:
PCAPWM4 = (unsigned char) (mod_timer&0x0100) << 1;
CCAP4H = mod_timer;
break;
case 5:
PCAPWM5 = (unsigned char) (mod_timer&0x0100) << 1;
CCAP5H = mod_timer;
break;
}
}
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