AVR Freaks

Looks like a really nice guide, I'll have to bookmark it now and use it later when I have a project that uses PWM.

thx dude,

Thankyou for a great guide. This is one of the best guides on PWM or any other AVR subject I have seen. I loved the layout so easy to follow and understand the maths, also the example figures where good too, and the code examples where good and covered a wide application for PWM useage.

Awesome 10/10

Rich

is there a good guide/tutorial on soft pwm?

hi guys i need ur help in program timer0 atmega8 please can any one help me out in that :(

and this is the program which i had used in avr studio4

thanking u sir mr.JohanEkdahl &mr.Koshchi

[But you haven't said what the problem is? ]

yes sir i got you and sorry for not mentioning the problem the code i have written is for generating 1 to 2 kHz square wave approximately but i am getting nearly 100 kHz wave here i am using the internal oscillator of 1 MHz for that it have to generate 1 to 2 kHz wave but it is not condition i don't know whats wrong in my code what do u suggest for this problem sir i hope you can solve my problem sir thanking u Mr.clawson
with best regards
Harish.G

@Koshchi: sir, apologies:-)
I am actually trying to generate a square wave of freq = 1kHz on the AVR ATMEGA8 microcontroller. The code which I have sent you is for the same.

When I built the program it showed 0 errors and 0 warnings

However while simulating the Timer_Counter (TCNT0) is incrementing by 7 instead of 1 for every clock cycle.

I use the polling method to check if the flag 't0v0' flag is raised which is housed in the register 'TIFR'.
If it happens to be raised we break the while loop and
write the value 0x01 to the register TIFR(that way the 't0v0' bit is cleared).

Also is there any problem with the compiler I use(AVR studio4 v 4.13)?

@clawson: sir yes then according to you if it was taking 7 cycles for execution then it should generate the square wave correctly in mcu but it is not the case. i am getting nearly 100khz. and i don't know how to use c+ASM can you please help me out in this or else can please send me the code for other timers can you help me out in this please :(

@clawson:
sir,please apologies me and don't mistake me i am just a beginner cani know how can i disassemble the c file in avr studio please and as per u it should increment 4 steps at a time but it is incrementing by 7

Ok i will fix my key board problem. now i am working on serial communication.can u please send me some example programs or links for that.

@JohanEkdahl:
No sir i am not irritated the work i had done on usart is i had configured the usart in asynchronous mode with 9600 baud rate. i don't what's the problem in the program. that i am not getting the output. Please i request you to send some example c code for both transmission and reception or send me the link where i can get the code

@JohanEkdahl
Ya sir i had checked those those programs support avr studio but i am working with code vision avr.But the code vision avr does not support this type of instruction. Which are mentioned below

[ UCSRB |= (1 << RXEN) | (1 << TXEN); // Turn on the transmission and reception circuitry
UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); /]

[/code]
The error which i was encountering is i am getting the data output as "<0>" this type.The major part of program is mentioned below please check out the code once[// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: Off
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud rate: 9600
UCSRA=0x00;
UCSRB=0x08;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x71;
while (1)
{ for (i=0;i<=7;i++) {
UDR='c';
do {
x=UCSRA&0x40;

}
while (x==0);
UCSRA = 0x40;
};

/* Put data into buffer, sends the data */

};
}]