Comments on: Generating PWM with PIC Microcontroller using Hi-Tech C

By: praveen

praveen — Fri, 15 May 2020 15:26:32 +0000

In reply to Ligo George. its difficult to check data sheets again and again, so its better to quit embedded study :P

By: Ligo George

Ligo George — Mon, 11 May 2020 14:09:34 +0000

In reply to praveen. Check the datasheet of PIC 16F877A, register CCPxCON. In that bits CCPxX and CCPxY are least significant bits of PWM duty.

By: praveen

praveen — Mon, 11 May 2020 07:52:43 +0000

CCP1X = duty & 2;
CCP1Y = duty & 1;
can u explain this?

By: ajit nayak

ajit nayak — Fri, 24 Nov 2017 13:11:00 +0000

Thanks for Provide information.
IF i want to change frequency how can i change it. PWM1_Init() function will during first time . Is it means when program enter while loop it generate frequency @ 5khz??
int PWM_Max_Duty()
{
return(_XTAL_FREQ/(freq*TMR2PRESCALE);
}
what does freq default value ?? it has been defined as long.

By: Ligo George

Ligo George — Sun, 27 Nov 2016 09:16:00 +0000

In reply to ranjith thottathil.

Kindly use our forums ( https://electrosome.com/forums/ ) for asking doubts outside the scope of above article.

Please mail to [email protected] if you need premium support.

By: Ligo George

Ligo George — Sun, 27 Nov 2016 07:50:00 +0000

In reply to Jason Ah Woei. The main thing that you need to understand is the PWM resolution will change depending on the oscillator frequency and pwm frequency. That is why we are calculating like this.

By: ranjith thottathil

ranjith thottathil — Thu, 24 Nov 2016 06:17:00 +0000

can u help me into implement a stepper motor angle controller using pwm where we can change pwm frequency using 4*3 keypad?

By: Jason Ah Woei

Jason Ah Woei — Tue, 18 Oct 2016 14:17:00 +0000

PWM1_Duty(unsigned int duty)
{
if(duty>2;
}
}

can someone explain to me how this code work in calculating duty cycle
Pls help, Thank you

By: Ligo George

Ligo George — Sat, 03 Oct 2015 09:21:00 +0000

In reply to Aashish Joshi. TRISB = 0; is not required there TRISC bit will be written by PWM1_Init() function.

By: Aashish Joshi

Aashish Joshi — Fri, 21 Aug 2015 06:26:00 +0000

Hi i ve seen in your code TRISB = 0; you are making port B as output but in your circuit diagram you are taking output from port C