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Questions tagged [avr]

AVR is the family of microcontrollers used in Arduino boards.

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45 views

C++ State Machine / Wpmf-convesion

I'm quite a newbie using C ++. I am trying to implement in C ++, the state machine described in this link for C language: https://barrgroup.com/Embedded-Systems/How-To/Coding-State-Machines. I have ...
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24 views

Custom bootloader for battery level indicator

For a project I need to be able to read the battery level of the device regardless of the sketch currently running. For this I plan on adding a custom routine in the Arduino bootloader that reads the ...
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37 views

AVR program upload overrides unrelated program area

I develope a new bus system (uartbus) which includes a host application that can handle new program uploads throught the bus. How it's work in short: The host application flashed to the AVR. This ...
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2answers
60 views

Change the fuses of an Arduino Uno (can an Arduino Uno change its own fuses?)

For now, I'm using an Arduino Uno alone including its 328p (no other external chip to program). I would like to change its fuses to internal 8 Mhz clock (because then I'll move the 328p out of the ...
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2answers
46 views

Using an Arduino Nano to program (as ISP) a standalone 328p

I uploaded the ArduinoISP sketch to an Arduino Nano to use it as a programmer for other chips. It worked successfully to program an ATtiny45, I did the usual wiring between them, and added a 10uF ...
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49 views

about required memory size in ATmega32 to execute a certain program

If I want to add two numbers and print the output on LCD char answer[8]; float a=5.1,b=3.2,c; c=a+b; dtostrf(c,8,3,answer);//convert float to ASCII to print it on LCD for(i=0;i<8;i++) ...
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1answer
79 views

Uploading Firmware to Atmega1284p using ESP8266 with AVRISP as programmer

I am trying to flash a new Firmware to my Ender 3 Pro. I am using the ESP8266 as an ISP via AVRISP over Wifi. I have a 10mF capacitor between the ground and reset of the ESP8266 I followed this ...
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1answer
41 views

How to set PC (Program Counter) register to another function (for scheduler)

I am trying to implement a scheduler for Arduino Mega 2560. I think I lack understanding of how to set the PC register to another instruction. Here is my simple approach so far: void dummy(){ ...
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57 views

Program uploads, but outputs flash reading error?

I'm new to Arduino, and I recently got 3 off-brand Nanos, and soldered pins for all three. Initially, none worked (I always received avrdude's errors when uploading). Based on my research, I ...
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1answer
38 views

about how to share one External serial EEprom using two microcontrollers?

strong texti have Vector nav100 IMU sensor that sends data serially UART.I want to receive data from it using ATmega32 and then store data in AT24c1024 EEprom using I2C,then using another ATmega32 to ...
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1answer
44 views

about how to write data in the whole EEprom?

I have interfaced AT24c1024 EEprom with ATmega32.AT24c1024, which has 512 pages each of 256 bytes. There are two mode of writing (byte write and page write). In page write mode, it is capable of ...
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1answer
48 views

Rate of serial communication (UART) of a sensor is faster than speed of processing of microcontroller

I have a Vector Nav VN100 IMU sensor that sends data serially UART. I have interfaced it with ATmega32. It receives data (ROLL angel) from the sensor and according to the ROLL angel, it controls a ...
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2answers
35 views

Atmega collecting and relaying interrupt calls

I like to collect all possible interrupt and relay them to an alternative handler interrupt table what the user can set. In order to do this i have to: 1) collect all/any interrup request 2) ...
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1answer
45 views

Arduino Timer0 Piggyback

As described here https://learn.adafruit.com/multi-tasking-the-arduino-part-2/timers I use timer 0 to get my own timer with a milliseconds resolution. It is setup like this: void setup (void) { ...
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40 views

MEGA2560 only starts program after pressing RESET button multiple times

I am working on a program where I am controlling an MP3 player by using UART between my MEGA2560 and the MP3 player. The MEGA2560 sends serial commands to the MP3 player when external interrupts are ...
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2answers
46 views

About ATmega32 event system

From my reading on internet i found that the Event system allows peripherals to trigger each other without involving the CPU...does the event system is software or hardware?also does ATmega32 support ...
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26 views

freeRTOS tasks never run on Lightblue Bean

Although Punchthrough no longer supports the Bean and Bean+ they still maintain the online compiler and reference materials: Bean Github Bean reference One of the external libraries they've included ...
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1answer
78 views

Help understanding how avrdude works with ArduinoISP and why its not working for me

I am trying to use avrdude with a Mega2560 running ArduinoISP Note: I have the 10uF cap on the Mega2560 RESET line as described by Ardunio. Also, I am using avrdude/6.3 on Windows 10. The Mega2560(...
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2answers
83 views

Use ATTiny as a battery-backed RAM?

So, I found an interesting article the other day, and I'm trying to build a project that could benefit from a battery-backed memory (no wear limits, but keeps data over power cycling). The article ...
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22 views

Moving timer-related code into a separate file causing timing inconsistencies?

I have written the following code, attempting to re-implement the Arduino micros function: main.c #include <avr/interrupt.h> #include <stdbool.h> #define CLOCK_CYCLES_PER_MICROSECOND (...
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205 views

how to fix USBASP Unknown USB Device (device descriptor request failed) - Win 10?

I just recently purchased Usbasp from Ali Express, when i'm connecting it to the windows 10 desktop in device manager its Unknown USB Device (device descriptor request failed). How to fix this error? ...
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1answer
185 views

Restoring all fuse bits on AtMega328P-PU

I'm worked with Low Fuse bits in AVRDUDEPROG 3.3. Fuses was non-inverted. And by mistake I enabled SUT1 and SUT0, when SUT0 was enabled. And when I programmed avr, it shows me error that avrdude.exe: ...
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19 views

What would cause fuses to be writeable but bootloader not to be writeable?

I am trying to burn a bootloader onto an ATmega328P-AN using an Microcenter knock-off Arduino Uno R3 as my ISP for several days with no luck. The farthest I've gotten is writing and reading a few ...
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0answers
21 views

Custom Arduino Due Random Lock up

I have built my own Arduino Due Circuit board. I am having issues with it randomly locking up. I have researched the libraries and have ruled out any issues with them such as the Wire library. I am ...
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1answer
140 views

Can I program a factory fresh Atmega328P through UART pins without burning a bootloader?

Can I program a factory fresh ATMega328P using the UART pins without burning a bootloader? These pins are TX, RX, VCC, GND, and DTR pins in the schematic below. They are not the ISP/SPI pins 10-13. ...
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1answer
74 views

About UART one transmitter multiple receivers

I have vector nav vn100 IMU that sends data serially rs232...I want to drive 4 servo motors using atmega32 upon roll angel from vector nav vn100..atmega32 can only drive 2 servos using hardware fast ...
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33 views

can an ISR change the value passed by pointer while the subroutine is executing?

So I am working on a project where the board plays a song on a buzzer using PWM and I want the song to stop when i press an external button typedef enum stateType_enum{ waitPress, debouncePress, ...
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1answer
65 views

Force TCNT to stay below OCRxA on ATmega328P

I'm using a timer and the TIMERx_COMPA ISR to generate a signal in "the background". This ISR is triggered when the timer reaches a certain value (OCRxA), which in turn can be changed by the user. ...
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1answer
57 views

About possibility of implementing kalman filter on atmega32 [closed]

I have searched on the internet on how to get Euler angels from IMU measurements,I found that kalman filter and mahony filter are used...kalman filter has a drawback of complex computations,but mahony ...
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1answer
115 views

.elf and .hex equivalency? (code, eeprom, fuses, and lock bits all in one)

I have all configurations (eeprom data, fuses, lockbits) of my ATMega168A together with the code in my C files. The compilation creates an elf file that I use as an all-in-one programming file for ...
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22 views

Installed configuration won't show up on Board menu

So I was following these instructions on the official site. Download this hardware configuration archive: breadboard-1-6-x.zip, Breadboard1-5-x.zip or Breadboard1-0-x.zip depending on which IDE you ...
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2answers
443 views

AVR software reset without watchdog

I wrote a generic avr program wrapper which already use the watchdog timer to restart - and after the watchdog reset - recover the the bad situation. After this recover process i have to restart the ...
2
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1answer
115 views

AVR-GCC can't call function located on fixed address

I wrote the following code: #include <avr/io.h> __attribute__((noinline, section(".app_start"))) void app_start() //app_start section starts at 0xFA0 { //register_packet_dispatch(...
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1answer
133 views

Can the IDE handle a 32khz main clock?

I read somewhere that having the main clock be 32768Hz messes not only with micros() and millis(), but with some other stuff too. Is this true? Will I have to forgo the Arduino IDE to program for an ...
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1answer
51 views

Lines not pulsed fast enough (?))

Should this code pulse the PB3 and PB4 pins (MOSI and MISO of an Arduino Uno) at 2ms interval ? #include <avr/io.h> int main(void) { // for (byte i = 0; i < 32; i++) // pinMode(i, ...
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1answer
63 views

noisy output lines when waking up from a sleep

Using code similar to these examples from AVR https://www.microchip.com/webdoc/AVRLibcReferenceManual/group__avr__sleep.html my program causes my Adafruit Feather 32u4 to often sleep. When the ...
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0answers
71 views

Programming ATMEGA328p via AVR Pocket Programmer

I have a ATMEGA328p on a breadboard with the following connections to the 2x3 ICSP connector and its connected to AVR Pocket Programmer. While running AVRDUDE utility, i get the following error, ...
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2answers
362 views

How are errors (not related to syntax) managed in arduino and in the AVR architecture in general?

I was just curious about how the AVR architecture manages errors that would cause a regular desktop program to crash. I'm talking about logical errors for example math problems that are undefined. ...
2
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1answer
286 views

Trying to run Timer1 in ATmega2560 with assembly

I have a slight problem with Timer1 in arduino (ATmega2560) while coding it in assembly. I try to run the Timer1 in CTC mode - I configure everything well in my opinion, but the TCNT1 just doesn't ...
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2answers
61 views

Why isn't the stack pointer changing in this simple sketch?

I'm playing around with context switching, and my first idea is to play with SP and see how it changes. However, Sp doesn't do what I expect. The sketch is below. I'm using an Uno R3. What I expect ...
2
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1answer
155 views

Assembly for loop repeating 2 times when it's only suppose to do it once

I'm programming an Arduino Nano so I belive that this question should be qualified for this SE. I am trying to dim up an LED using a for loop in AVR assembly. My problem is that the cycle is ...
5
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1answer
381 views

Why are Arduino timer registers not 0?

I'm trying to use the timer registers to do some timing on my Arduino Mega 2560. The output of the following code confuses me: void setup () { // Set up serial connection Serial.begin(9600); ...
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1answer
143 views

Arduino and AVR Serial Communication over USB

I have a Arduino Uno Rev3 and I would like to use a AVR development toolchain to write a program that performs serial communication over USB. Doing this using the Arduino IDE is fairly simple: void ...
2
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1answer
646 views

Generating 200 kHz pulse on Arduino Uno in normal mode

I need to obtain 200 kHz from Arduino Uno. I am using Timer0. I have configured it to run in normal mode and the Prescaler is set to clk/8 (the clock frequency of Arduino is 16 MHz). TCNT0 ...
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1answer
203 views

OpenOCD with FT2232H on Arduino Mega (ATmega2560)

I want to do on-chip-debugging on an Arduino Mega. According to its datasheet, the ATmega2560 chip supports JTAG. (IEEE 1149.1 compliant) Can I use a generic FT2232H interface to do on-chip-debugging ...
2
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2answers
429 views

How to read OC0A when in CTC (toggle) mode?

I have this code, which puts the Arduino into CTC mode with interrupts, and outputs a square wave on PD6 (OC0A): void setup_timer(double p_ms, double duty){ DDRD |= (1 << 6); // set pin 3 as ...
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2answers
86 views

Help - Atmega328p, converting a PWM servo code from pin9 to pin6

I found a working code that uses pin9 (PB1) on my Arduino for controlling a Servo, but in my project, an ultrasonic sensor is already using that pin/timer. I want to convert the code to use pin6 (PD6),...
0
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1answer
131 views

How to stop sending the last received char of UART echo function?

I developed a code for uart based ISR with linear buffers, the problem is that it keep sending the last received char in Arduino IDE. Here's the application code: #include "uart_new.h" void setup() ...
2
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3answers
1k views

Is it possible to use extra AVR Flash memory as non-volatile EEPROM-like Flash memory storage?

In STM32 microcontrollers it is possible to use a technique that ST calls IAP, or In-Application Programming, in order to write to the Flash memory from your running application. They even have a nice ...
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1answer
183 views

Burn hex with optiLoader

Can optiLoader be used to burn custom hex? For example, there's hex representation stored in optiLoader.ino in image_328, if that value is replaced with content of my pre-compiled hex, should that ...