Questions tagged [avr]

AVR is the family of microcontrollers used in Arduino boards.

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3
votes
1answer
57 views

Why am I only receiving the first address byte? (I2C Protocol)

Expecting the slave to ACKnowledge and return data, but it does not. This is my protocol. This is my Datasheet. Also FYI I'm on an Arduino Fio but I am not inheriting the Arduino library. #include &...
1
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0answers
30 views

Fresh install getting Assembler Error

I am using Raspberry Pi 4 to connect via usb to program ardino Nano, I intend to communicate with the nano via i2c, but this is irrelivant. With a fresh install of Arduino for ARM 32 bit I get this ...
0
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1answer
512 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 ...
1
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1answer
47 views

Why do I get different results when compiling the same code with different ide?

I have a basic code about reading true rms.I compiled the same code with arduino ide and atmel studio, then ran it in a proteus simulation.I'm trying to measure how long the read_rms() function takes. ...
1
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1answer
41 views

ISP Programmer with Serial and 5v/3.3v power

I currently use a Pololu USB AVR Programmer v2.1 for programming 328p chips and I really like it. The ability to have ISP and Serial in one physical device, enumerating as two separate COM ports on ...
1
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2answers
144 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),...
1
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0answers
53 views

Why is the same program taking up more space in atmel studio?

When I compile the same program with atmel studio, the result is: Program Memory Usage : 1326 bytes 16,2 % Full Data Memory Usage : 0 bytes 0,0 % Full ...
1
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2answers
66 views

How to add two assembly arrays in arduino

Hey guys what I'm trying to do is to sum two arrays and return a new array; for example if given uint8_t a[] = {2, 4, 6}; uint8_t b[] = {1, 2, 3}; I should get { 3, 6, 9} What I'm trying to do is ...
2
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1answer
126 views

Assign an interrupt to any pin of the atmega328 microcontroller

I need to record the appearance of a signal from the sensor on the PD0 pin. This is the first time in my life that I want to use an interrupt for this. With your help, I configured the sketch for my ...
1
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1answer
41 views

Is it possible my ATMega is burnt due to bad wiring?

While working on a project I tried sending data from my Arduino NANO to ATMega64 placed on AREXX Robot arm PCB via TXD/RXD. After plugging in VCC, GND, TXD and RXD to UART socket it didn't work so I ...
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0answers
18 views

AVR USB based device detection problem after switching from RPI3 raspbian stretch to buster [closed]

I have a device constructed from a Raspberry Pi 3 B and an AVR based USB device. The interconnection of these components is depicted in this picture. When RPI is on, data lines of keyboard will be ...
4
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1answer
271 views

Programming an AVR using ISP

I am trying to program an atmega with arduino sketch using ISP only (mac user). So I know how to burn a boot loader, and then to program the chip using the TX, RX. But I would like to program it ...
0
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2answers
425 views

BASCOM-AVR stk500_2_ReceiveMessage(): timeout: -1

Arduino Uno R3 Windows 10 Bascom AVR The ON is alright. The LED flickers now and then. The RX and TX flickers when I press the program button on Bascom but then disappears almost immediately. ...
0
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1answer
2k views

Error uploading to ATtiny

I followed Great Scott's video on YouTube for uploading to an ATtiny85. When I tried I got the following error messages: Arduino: 1.6.7 (Windows Vista), Board: "ATtiny85 (internal 8 MHz clock)&...
1
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0answers
25 views

About ATmega32 UART receive

The following code is the code for UART receving Char uart_receive { While( ! ( UCSRA & ( 1 << RXC ) ) ); return UDR; } This function will not return the UDR value until the while loop ...
1
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1answer
81 views

Problem with programming digispark ATtiny85 board with Arduino IDE

I have bought a Digispark ATtiny85 board to learn about that microcontroller. So I tried using internal register names in the code rather than using Arduino in built functions. I can get the board to ...
1
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1answer
27 views

About maximum length of matrix can be use for matrix invertsion on atmega32

what is the maximum length for matrix can be used for matrix inversion on atmega32,for example,can we implement matrix inversion for 15x15 matrix on atmega32? And if it can be done on atmega32..does ...
0
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0answers
108 views

Digispark green led being the only one to turn on

I was doing some tests with an ATtiny85 Digispark module using Arduino IDE on my Windows PC. I was testing some stuff with the DigiKeyboard library from Digistump. Everything was going fine until ...
0
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1answer
867 views

Attiny85 microcontroller programming without arduino

I have decided to make a simple project so thinked about arduino but that seems very worthy so i decided to use attiny85 ic for my project,but i don't have arduino or avr to program it. Is there any ...
0
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0answers
36 views

Is it possible to implement old AVR library onto arduino (specifically, NodeMCU esp8266)

I am a Computer Engineering Undergrad, currently in a cryptography(computer security) course, and I was assigned to do projects about implementing µNaCl library onto Arduino. I currently own a nodemcu ...
2
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1answer
56 views

3-instruction remote machine coding Arduino Atmel chip over a serial line from a tethered (host) PC

I'm trying to write a program for AVR Atmel 328 chip on Arduino Nano board that will allow me to send machine code instructions to the chip over a serial line, run/execute them on the chip, and ...
2
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1answer
2k views

Uploading .hex to ATTiny13 using Arduino

I would like to upload a .hex to ATTiny13V (or '13A) using Arduino Uno R3. I think I know everything to do, but ATTiny13 ISP support and Arduino IDE is a bit search-and-find, and I have some grey-...
3
votes
4answers
657 views

How can a function/method determine if a const array passed in is PROGMEM (flash) or not (RAM)?

Is it possible for a function/method to know if a constant array that has been passed in is in flash or RAM? If I have a method or function that receives a constant array that is in RAM, the array is ...
1
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0answers
40 views

For loop blocking other program mm

Currently practicing my programming knowledge So,am using atmel studio to program atmega328p I have a "for" statement that flashes an LED(led1) 5 times when button1 is pressed. Then another "if" ...
0
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0answers
49 views

AVR Relocated code: calling global constructors

In my setup (UARTBus) i use a host application on an AVR which can accept application code from a custom bus system and the host can call that application program periodically. The application code ...
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0answers
57 views

how do i convert to assembly code (AVR assembly) from arduino

i have code in the Arduino ide for a temperature sensor that shows the temperature on three 7 segment displays, it shows the temperature to one decimal point. using an arduino uno. I am struggling to ...
0
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0answers
55 views

Trying to use Timer0 on Arduino Mega

I've recently been looking at Timers and I'm trying to generate a PWM frequency at 250000Hz using Timer0 on PIN 4. When I set OCR0A = 63 I get nothing from the light however when I set OCR0A = 125 it ...
1
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1answer
377 views

AVR & PIC 8-bit Microcontrollers - Can you add: external flash memory, external RAM, video & audio output, more address busses?

so I was planning on creating a mini PC out of basic ICs and 8-bit microcontrollers such as ATTinys and/or PICs and I have several questions regarding those: Can you add external RAM, say with SRAM, ...
-2
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1answer
52 views

Reading PROGMEM results in an incorrect hex value [closed]

I'm sure I'm doing something stupid here, but the code below is supposed to write the test hex values to a I2C EEPROM, however when I attempt to read the EEPROM it has the wrong values. Directly ...
0
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0answers
112 views

Batch programming AVR chips via ICSP with an esp8266

I had an interesting idea recently, but don't have all the knowledge needed to make it work. I know that several people have made Arduino programmers with an esp8266, allowing them to program the ...
0
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1answer
480 views

Use of progmem in ESP8266 vs AVR and also how to handle large dynamic strings

This is a somewhat tricky question dealing with implementation and best-practices of the ESP8266. I'd ideally hope that it's answered by people with in-depth knowledge on the problem. As you are ...
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0answers
23 views

about receiving float on Atmega32 from matlab

I want to receive a float on Atmega32 from matlab. I display the output on an lcd, but i receive 0.000, can any one help me? Please ... matlab code s=serial('COM1','BaudRate',9600); fopen(s) fwrite(...
1
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2answers
51 views

about receiving float on matlab from ATmega32 Avr

****i am using ATmega32 to send float and want to receive it on matlab,i send 4.85 from ATmega32 but on matlab i receive 4.260233679216239e-31...can any one help me..thanks in advance** ** //...
4
votes
1answer
9k views

How to convert Arduino example sketch to a complete c++ project?

I'm experimenting something new with my Arduino Leonardo. I removed its original bootloader and flashed it with LUFA mass storage example with added functionalities(now its a firmware). I'm trying to ...
0
votes
1answer
525 views

Cannot write to HID USB device (Arduino, V-USB, HidSharp)

I am currently prototyping an HID USB device using Arduino Nano and V-USB library. The problem is that although I can read from the device I cannot write to it. Here is the schema: As for the ...
1
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0answers
39 views

default in switch doesn't appear to execute

I have a situation where the default case in my switch statement doesn't appear to execute as expected. I wonder if there is some subtlety I'm missing here? Given the following enum: enum ...
0
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1answer
127 views

Atmega328p Uploads via ISP but not bootloader

I'm trying to upload a bootloader to my atmega328p on a custom pcb containing external oscillator at 16MHz. It is possible to upload program via ICSP pins using Arduino as ISP (Official Arduino Uno) ...
0
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2answers
47 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) ...
2
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2answers
1k views

programming arduino in pure c

I'm trying to flash pure c-code to arduino Mega2560 board from linux using avr-gcc & avrdude. Compilation is done , now trying to flash using avr-dude, getting error as "avrdude: stk500_recv(): ...
-1
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3answers
525 views

Why are embedded C codes are ending with “while(1)”?

I always see while(1); at the end of the C codes such as: #include <stdio.h> int main(void) { //Some code here... while(1); } If I'm not wrong that it always exists, what is the ...
0
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1answer
115 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 ...
1
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0answers
228 views

AVR-Toolchain for Arduino crashes on Mac OSX 10.11.6: Hints or debugging help needed

My Arduino IDE does not compile any project since I updated from Mac OSX 10.6.8 to 10.11.6. I even tried reinstalling and also manually installing the original AVR-toolchain. But the behaviour did ...
0
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2answers
578 views

Use Arduino Uno to program the on-board Atmega328 in C

I have an Arduino Uno board. I have seen how it is possible to program external AVR's through the Arduino Uno board, for instance an ATtiny. But I'm starting with c for atmel µc and I just want to ...
2
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2answers
5k views

Since double and float represent the same data type (usually), which is preferable?

It looks like on ATMega based boards, float and double are equivalent 32-bit (4-byte) data types. However, on the Arduino Due, doubles are 64-bit (8-byte) where floats are 32-bit (4-byte), same as ...
2
votes
1answer
232 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(...
0
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1answer
138 views

avr-gcc -D is ignored

Im trying to use XCode to compile avr program with arduino libs but seems like something wrong with my Makefile because it throws me warnings like # warning "F_CPU not defined for <util/delay.h&...
1
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0answers
31 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 ...
0
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2answers
8k views

Can't burn bootloader through Arduino Nano clone ISP to atmega328p

I'm trying to use a Nano v3 as ISP to program an atmega328p on a board with ISP headers: I followed the instructions under https://www.arduino.cc/en/Tutorial/ArduinoISP which I think have been ...
1
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0answers
45 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 ...
-1
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1answer
290 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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