/*PROGRAM WRITTEN BY TAIWO FOLU. PWM CONTROL OVER BLUETOOTH WITH DTMF TONES. INPUT ON ATTINY2313 PINS PB4 TO PB7. PWM SIGNAL OUTPUT ON PB2 (OC0A) AND PD5 (OC0B) USING TIMER0. TWO EXTRA I/O PINS ON PB0 AND PB1*/

#include
void initPWM()
{
TCCR0|=(1<<WGM01)|(1<<COM01)|(1<<CS00);
//Freq=FCPU, phase correct pwm, non inverted PWM (mode3)
DDRB|=0xE0; //Set PB0, PB1 and PB2 for output and the rest for input
DDRD|=(1<<PD5); //Set PD5 for output
}
void SetPWMOutput(Uint8_t duty)
{
OCR0A=0; //Set dutyA to 0%
OCR0B=127; //Set dutyB to 50%
}
void main()
{
Unsinged int f;
while (1)
{
f=PINB;
switch (f)
{
case 0×04: //when key 4 is pressed
{
OCR0B++; //increment OCR0B
break;
}
case 0×05: //when key 5 is pressed
{
OCR0A++; //increment OCR0A
break;
}
case 0×06: //when key 6 is pressed
{
OCRB–; //decrement OCR0B
break;
}
case 0x0A: //when key0 is pressed
{
OCR0A–; //decrement OCR0A
break;
}
}
}[/syntax]

I intend to use the dtmf tones to control the duty cycles of pwm channels A and B on timer0. Please look through the code and help me if i've made any mistakes or unnecessary statements or he there's a better way to implement this. Here, i've not used the PB0 and PB1 pins yet so I don't get confused, I want to get the duty cycles control right first.
Thanks a lot.

Thanks a lot for your feedback! Only people like you provide energy to keep me writing …

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“In the above setup if I vary OCR1B, will I get a Fast PWM on OC1B, whose duty I can vary independent of OCR1A.”

I tried. Yes it can be done.
———————————————————–
“In that case I can use OC1A and OC1B to drive the two ENABLE pins of LM293D (motor driver) independently.”

I have still not tried. But I am sure it can be done.
———————————————————–

Greetings for the new year to all.

I am using Atmega16 with 8 Mhz external crystal. I have been able to set the Timer1 prescaler and Fast PWM mode. By varying OCR1A and I could vary the duty of Fast PWM on OC1A.

My query is as follows :
In the above setup if I vary OCR1B, will I get a Fast PWM on OC1B, whose duty I can vary independent of OCR1A. In that case I can use OC1A and OC1B to drive the two ENABLE pins of LM293D (motor driver) independently.

Let me know if the above concept is valid.

Thank you.

One reason that i could find for the slow process was a fault in the programming. 1sec = 100msec, but in your code (part II), 1000msec was used. But after that, the clock became too fast.. approx, it took 4sec to complete 10sec of display.