串口接收引起的模拟PWM调光闪烁，请高手帮帮忙

只看该作者 · 2010-11-9 15:17

PWM调光的频率被串口打断。尝试找个pwm调光最大的抗干扰时间（隔了多久，让定时器在此工作不会出现闪闪）

只看该作者 · 2010-11-9 15:18

全调光范围都闪吗？会不会PWM频率太低了?
SmartEnergy 发表于 2010-11-9 14:55

不是，因为是两块单片机，我和队友，一个用STC12C5608单片机写数码显示和按键之类的，我则用STC90C52单片机写12路模拟PWM效果，单块效果都是可行的，但是在加入串口接收程序（用于更新数据）后，才会闪烁的

只看该作者 · 2010-11-9 15:19

:dizzy:优化中断程序
wkfuye 发表于 2010-11-9 15:08

不知如何优化呢？

只看该作者 · 2010-11-9 15:31

大哥,您就换个单片机吧,像AVR,STM系列的,硬件PWM,多好呀!!!

只看该作者 · 2010-11-9 15:54

大哥,您就换个单片机吧,像AVR,STM系列的,硬件PWM,多好呀!!!
believe0815 发表于 2010-11-9 15:31

大哥，12路PWM啊，不是4路，如果是4路，我己解早就解决了，关键是我们以前看过客户的一个产品，人家都做得到，为什么我就做不到呢？所以更加要找出原因，解决他，望各位大侠出出主意啊

只看该作者 · 2010-11-9 15:59

看了以上的讨论，有个疑问
PWM调光，PWM周期最多也就20ms，这段时间分了多少个等级呢？
PWM优先级最高时串口接不到数据时什么原因？1中断间隔时间短，也就是上面说的20ms分了多少个等级。2中断服务程序冗余。
或许能帮到你！！

只看该作者 · 2010-11-9 16:09

上传一段实现12路PWM功能的定时程序，望大家提个见议
注：T0_delay:定时时间 R_PWM_1:第一路红色LED占用的高电平时间（0~100）
CYCLE :PWM周期（100） G_PWM_1:  第一路绿色LED占用的高电平时间（0~100）

void tim(void) interrupt 1 using 1
{
unsigned char R1_Count;
unsigned char R2_Count;
unsigned char R3_Count;
unsigned char R4_Count;
unsigned char G1_Count;
unsigned char G2_Count;
unsigned char G3_Count;
unsigned char G4_Count;
unsigned char B1_Count;
unsigned char B2_Count;
unsigned char B3_Count;
unsigned char B4_Count;
TH0=(65536-T0_delay)/256;
TL0=(65536-T0_delay)%256;
R1_Count++;
G1_Count++;
B1_Count++;
R2_Count++;
G2_Count++;
B2_Count++;
R3_Count++;
G3_Count++;
B3_Count++;
R4_Count++;
G4_Count++;
B4_Count++;
/////////////////////////////////////////
if(!R_PWM_1 || !R1_Count)
{
  R1_Led = LED_OFF;
}
if (R1_Count <= R_PWM_1)
  {
   R1_Led = LED_ON;
  }
else if(R1_Count <= CYCLE)
  {
R1_Led = LED_OFF;
  }
else
  R1_Count=0;
////////
if(!R_PWM_2 || !R2_Count)
{
  R2_Led = LED_OFF;
}
if (R2_Count <= R_PWM_2)
  {
   R2_Led = LED_ON;
  }
else if(R2_Count <= CYCLE)
  {
R2_Led = LED_OFF;
  }
else
  R2_Count=0;
////////
if(!R_PWM_3 || !R1_Count)
{
  R3_Led = LED_OFF;
}
if (R3_Count <= R_PWM_3)
  {
   R3_Led = LED_ON;
  }
else if(R3_Count <= CYCLE)
  {
R3_Led = LED_OFF;
  }
else
  R3_Count=0;
///////
if(!R_PWM_4 || !R4_Count)
{
  R4_Led = LED_OFF;
}
if (R4_Count <= R_PWM_4)
  {
   R4_Led = LED_ON;
  }
else if(R4_Count <= CYCLE)
  {
R4_Led = LED_OFF;
  }
else
  R4_Count=0;
/////////////////////////////////////
if(!G_PWM_1 || !G1_Count)
{
  G1_Led = LED_OFF;
}
if (G1_Count <= G_PWM_1)
  {
   G1_Led = LED_ON;
  }
else if(G1_Count <= CYCLE)
  {
G1_Led = LED_OFF;
  }
else
  G1_Count=0;
//////
if(!G_PWM_2 || !G2_Count)
{
  G2_Led = LED_OFF;
}
if (G2_Count <= G_PWM_2)
  {
   G2_Led = LED_ON;
  }
else if(G2_Count <= CYCLE)
  {
G2_Led = LED_OFF;
  }
else
  G2_Count=0;
/////
if(!G_PWM_3 || !G1_Count)
{
  G3_Led = LED_OFF;
}
if (G3_Count <= G_PWM_3)
  {
   G3_Led = LED_ON;
  }
else if(G3_Count <= CYCLE)
  {
G3_Led = LED_OFF;
  }
else
  G3_Count=0;
///////
if(!G_PWM_4 || !G4_Count)
{
  G4_Led = LED_OFF;
}
if (G4_Count <= G_PWM_4)
  {
   G4_Led = LED_ON;
  }
else if(G4_Count <= CYCLE)
  {
G4_Led = LED_OFF;
  }
else
  G4_Count=0;
///////////////////////////////
if(!B_PWM_1 || !B1_Count)
{
  B1_Led = LED_OFF;
}
if (B1_Count <= B_PWM_1)
  {
   B1_Led = LED_ON;
  }
else if(B1_Count <= CYCLE)
  {
B1_Led = LED_OFF;
  }
else
  B1_Count=0;
//////
if(!B_PWM_2 || !B2_Count)
{
  B2_Led = LED_OFF;
}
if (B2_Count <= B_PWM_2)
  {
   B2_Led = LED_ON;
  }
else if(B2_Count <= CYCLE)
  {
B2_Led = LED_OFF;
  }
else
  B2_Count=0;
//////
if(!B_PWM_3 || !B1_Count)
{
  B3_Led = LED_OFF;
}
if (B3_Count <= B_PWM_3)
  {
   B3_Led = LED_ON;
  }
else if(B3_Count <= CYCLE)
  {
B3_Led = LED_OFF;
  }
else
  B3_Count=0;
//////
if(!B_PWM_4 || !B4_Count)
{
  B4_Led = LED_OFF;
}
if (B4_Count <= B_PWM_4)
  {
   B4_Led = LED_ON;
  }
else if(B4_Count <= CYCLE)
  {
B4_Led = LED_OFF;
  }
else
  B4_Count=0;
}

因为要实现12路的PWM，所以感觉在定时器里面做了很多的事情，我想请问一下，这样行吗？如果不行，有什么办法可以解决这个问题？我试过用这种方法只实现四路PWM也会有闪烁，请问有别的方法吗？