All Questions
Tagged with avr interrupts
125
questions
1
vote
1
answer
66
views
Cannot stop Microcontroller's Hardware Timer from running
I'm using an Atmel ATMega8 microcontroller to control a stepper motor. (Datasheet).
Timer1 (a 16-bit hardware counter) is used in CTC mode to modulate an IO pin to provide the stepping signal to the ...
- 657
0
votes
1
answer
52
views
How to make a circuit which can give divided voltage to ADC and can send a trigger pulse to INT0 when I press a button?
I connected 4 buttons to the ADC module of AVR-ATMega328p with different resistor values,
To know which button is pressed this ...
- 45
0
votes
1
answer
111
views
AVR32 goes to unrecoverable exception when exiting interrupt routine
I'm using an ATUC128D3 microcontroller and have 5 switches connected to it. I have the GPIO interrupt configured to trigger on a falling edge and this works just fine.
It enters the interrupt and the ...
- 367
1
vote
1
answer
768
views
Simple AVR interrupts in C - How to cleanly stop and restart "INT0"?
I'm trying to use an ATTiny84's INT0 pin to detect a falling edge event on a 1 kHz signal.
What is the correct way to temporarily halt this interrupt INT0, and then resuming it at a later time, ...
- 249
0
votes
1
answer
299
views
Faster Timer0 overflow than 2 ms on Attiny85
I'm trying to get a Timer0 overflow with an overflow every 500us, but can't find a solution to get it so low.
I'm running the Attiny85 on its internal 1 MHz clock, so I know it is not gonna be the ...
- 309
0
votes
1
answer
72
views
Problem or misunderstand of ADATE bit on ATTiny45
I have 2 buttons connected to pulled-down ADC input.
I want to trigger ISR(SIG_ADC) when ADC finishes conversion - this is working.
If I start ADC using ...
- 209
0
votes
1
answer
212
views
UART doesn't transmit all characters when using UDREn interrupt
Note: I am beginner :) MCU: Atemega328p
In Method 1, I am using a UDRn data register empty interrupt once the transmit buffer is empty and inputting characters from ...
- 459
1
vote
2
answers
261
views
Does this interrupt improve performance even with while loop in ISR?
Note: I am a beginner :) MCU: Atmega328p
Which program below burdens the CPU the least? Would it be a significant difference?
Objective: to make a more "efficient" serial monitor by ...
- 459
0
votes
1
answer
222
views
Error Real Time Clock implementation AVR microcontroller
I want to create a real-time clock using ATmega328p microcontroller.
The microcontroller's frequency is 1 MHz. So, I think I should use timer interrupts in CTC mode to generate interrupt every second.
...
-3
votes
3
answers
673
views
How to write own ISR handler [closed]
I am learning about AVR programming and I know we have to use avr/interrupt.h library to use interrupts. However, my main reason to learn AVR programming is to program without any library so I want to ...
3
votes
0
answers
418
views
ISR won't modify a global variable (IAR)?
First, some background on what I'm working on.
I have a custom board with ATmega324A that I designed as part of a project I'm working on. Originally, software for the uC was written for GCC in Atmel ...
- 109
0
votes
0
answers
118
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AVR Interrupt: LED kept blinking and won't stop
Lately I realize I am still a newbie, when you can't blink a freaking LED properly. It's kinda sad. I try to simplify this LED code to the simplest form possible, and it still won't work properly. ...
user83582
1
vote
1
answer
588
views
Where is Interrupt Vector Table stored in ATmega32A?
Given that Atmega32A has three types of memory :
1) SRAM.
2) Flash (Program memory).
3)EEPROM.
In which section the Interrupt Vector Table is stored ?
- 105
0
votes
2
answers
115
views
AVR MCU Interrupt toggle a LED problem with 100 extra toggle
I am playing around with an AVR MCU. I am having trouble toggling a LED. It's being toggled faster than I have expected. It should be toggling at 500hz, but it's up to 600hz and not very stable. I ...
user83582
0
votes
1
answer
160
views
in AVR, if i use .ORG 0 with the main program , where is the interrupt vector table and .INCLUDE file data go?
I am studying AVR from the book "the AVR microcontroller and Embedded system by Mohamed mazidi" and "atmega32A data sheet"
in the book, it puts samples of cade which start like this
...
- 17