help me 10kHz PWM to control DC motor by AT89c52

[member_tdh]

c keil at89c52 delay

Hi all!!
I have a project is control a DC motor (1KW). I tried to generate pulse PWM at 10kHz but not successed. Can anybody hepl me how to generate pulse PWM at 10kHz use IC AT89C52.
Thanks all!!!

 

[IanP]

pwm by at89c52

Here is an example on how to generate PWM using Timer0 Interrupt ..

Try to follow it and if you have any further problems - come back ..
https://www.iguanalabs.com/pwm.htm

Regards,
IanP

 

[member_tdh]

pwm at only 10 khz

Hi!!!
I want to write a code by C language.Can anybody help me!!!

 

[IORY]

10khz pwm

member_tdh:
It is no wise to use a AT89c52 produce 10K PWM,unless tasks you give to the chip is few.
However,I will answer your question.
Use keil C to compile the following C programme

//Use 24M oscillator

#define T0_Init_Data 0x38
sbit PWM_Pin=P0^0;
unsigned char High_V_Data;
unsigned char Low_V_Data;
unsigned char PWM_Flag=0;

void Init_T0( void ) //initiate T0
{
TH0=T0_Init_Data;
TL0=TH0;
//T0 use Timer function and operating mode 2
TMOD&=0xf8;
TMOD+=0x02;
//enable interrupt
EA=1;
ET0=1;
}

void Set_PWM( unsigned char data ) //the parameter means PWM high voltage.The data's range:0---(0xff-T0_Init_Data)
{
//stop T0 timer
TR0=0;
//set new PWM parameter
High_V_Data=0xff-(T0_Init_Data+data);
Low_V_Data=data;

PWM_Flag=1;
TH0+=High_V_Data;
//start T0 timer
TR0=1;
}

//T0 overflow interruption serve
void int_T0 interrupt 1
{
if(PWM_Flag==1)
{
PWM_Pin=0;
PWM_Flag=0;
TH0+=Low_V_Data;
}
if(PWM_Flag==0)
{
PWM_Pin=1;
PWM_Flag=1;
TH0+=High_V_Data;
}
}

It's a long time I haven't use 51Core chip,if there any mistake in the programme,I apologize for that.
If any question,plz send me an E-mail:aaaaaaaaaalyl@163.com
I will try my best to help you.

 

[member_tdh]

pwm controller 10k hz

hi!
this is my test source: (.c) following your code that you gived me, but this code is not fine run. Can u fix it for me?
thanks!!!

void Init_T0(void)
{
TMOD|=0x22; // Timer1, mode 2, Timer0, mode 2
TH0=T0_Init_Data;
TL0=TH0;
ET0=1;
EA=1;
}

void Set_PWM(BYTE pwm)
{
TR0=0;
High_V_Data=0xff-(T0_Init_Data+pwm);
Low_V_Data=pwm;
PWM_Flag=1;
TH0+=High_V_Data;
TR0=1;
}

void int_T0() interrupt TF0_VECTOR//1
{
if(PWM_Flag&1)
{
PWM_Pin=0;
PWM_Flag=0;
TH0+=Low_V_Data;
}
else
{
PWM_Pin=1;
PWM_Flag=1;
TH0+=High_V_Data;
}
}

void main(void)
{
Init_T0();

while (1)
{
Set_PWM(pwm_val);
SenChr(PWM_Pin);

if (Inc_pwm_val==0)
{
delay(12000);
while (Inc_pwm_val==0)
{
pwm_val+=1;
if (pwm_val>250) pwm_val=250;
}
}
else
{
if (Dec_pwm_val==0)
{
delay(12000);
while (Dec_pwm_val==0)
{
pwm_val-=1;
if (pwm_val<5) pwm_val=5;
}
}
}

}//End while
}//End main

 

[member_tdh]

interrupt tf0_vector using

Can anybody help me???

 

[member_tdh]

pwm 10 khz dc to dc

Can anybody help me???

 

[massive attack]

pwm+at89c52 c code

hi IanP,

this page cannot open and i have same problem

i need assembly code...


23 Mar 2006 10:11 Re: help me 10kHz PWM to control DC motor by AT89c52

--------------------------------------------------------------------------------

Here is an example on how to generate PWM using Timer0 Interrupt ..

Try to follow it and if you have any further problems - come back ..
h**p://www.iguanalabs.com/pwm.htm

Regards,
massive attack

 

[IanP]

It looks like the IGUANALABS server has problems or it's gone ..
Meanwhile, maybe this short example will be of any use to you ..

		$NOPAGING
		$MOD252

; 8051 and PWM

		ORG	0000h 
		LJMP	Start

		ORG	000Bh 
		LJMP	Timer
 
Start:
		mov 	TMOD, #00000001b 
		mov	TH0, #11101010b 
		mov	TL0, #01111001b 
		setb	TR0 
		setb	ET0 
		setb	EA 
		mov	R0, #0d 
		mov	R1, #85d 
		mov	R2, #170d 
		mov	P2, #11111111b 
		mov	A, #255d
Again: 
		inc	A 
		mov	B, R0 
		cjne	A, B, Next_1 
		clr	P2.0 
Next_1:
		mov	B, R1 
		cjne	A, B, Next_2 
		clr	P2.1 
Next_2:
		mov	B, R2 
		cjne	A, B, Next_3 
		clr P2.2 
Next_3:
		cjne	A, #255d, Again 
		mov	P2, #11111111b 
		ljmp	Again

Timer:
		inc	R0 
		inc	R1 
		inc	R2 
		mov 	TH0, #11101010b 
		mov 	TL0, #01111001b 
		reti

	end

It generates 8-bit PWM on P2.0, P2.1 and P2.2 ..

Regards,
IanP

 

[massive attack]

thank you for your help IanP

 

[ashad]

use SG3525 with the AT89c52 ......... and generate the 20khz pwm then u will get very good results

 

[leinahtan]

Try this link though it was intentionally used as PCB drill controller, it works with other DC motor, i've already done this and still in great shape all the years.

**broken link removed**