All Questions
92
questions
0
votes
1
answer
80
views
How to identify all AVR MCUs (ATtiny and ATmega) that feature a factory-programmed unique ID
On Microchip's site, the "parametric search" table for microcontrollers does not have a filter column to select the models that feature a unique ID. Is there a way to list (enumerate) all ...
- 2,153
1
vote
1
answer
156
views
avr-gcc optimization deleting register writes on ATTiny402
I'm using avr-gcc (12.1.0, built with this script: https://github.com/ZakKemble/avr-gcc-build) to compile for the ATtiny402 and encountering problems with code optimization. Specifically, the compiler ...
- 13
1
vote
2
answers
248
views
AVR-libc `uart_putchar` implementation
In AVR-libc page 143 the implementation of the function uart_putchar() is typical as the following:
...
- 498
0
votes
2
answers
193
views
Where to find documentation for definitions for AVR programming in C
I wonder if there is a documentation for AVR (I am using C to program) definitions like PIN5_bm or SLEEP_MODE_PWR_DOWN, or if I ...
15
votes
3
answers
1k
views
Avr-gcc using repeated addition instead of MULU instructions
I recently compiled some C++ code for the ATmega1284P in Atmel Studio and was analyzing the timings of some routines using my scope. To my surprise, a loop I thought I had optimized was taking longer ...
- 904
0
votes
1
answer
206
views
Why does port B5 on ATMEGA64A-AU malfunction after enabling USART function?
I've wire up ATMEGA64A-AU based on this schematic from here:
I've tried to program a blink on pin B5 which has a LED on it:
...
- 19
1
vote
2
answers
67
views
ATmega48PB: wdt in interrupt mode still reset the MCU
I read the datasheet and this question, but there's still something wrong here.
Here my wdt init code:
...
- 1,235
1
vote
2
answers
227
views
Changing delay duration in _delay_us() changes code size
I was programming an ATtiny13A when I accidentally noticed that when I change the delay time in _delay_us() my code size changes. Here's the sample code:
...
- 320
0
votes
0
answers
303
views
Implementing UART driver with Interrupts and DMA - UART_RXC ISR is executed only first time a character is received
I am using ATxMega 32E5 and my current task is to rewrite existing RS485 driver and use DMA to save in my case
valuable cycles (the speed is going to be multiplied by 8x going from 230k to 2M baudrate)...
- 13
1
vote
0
answers
164
views
Relocation in MPLAB IDE X
I'm writing a bootloader for ATXMEGA256A3U. At page 14, Table 7.1 of the datasheet I know the bootloader address start at 0x20000.
Using AtmelStudio I set in the linker option the following ...
- 1,235
0
votes
3
answers
129
views
Buffer exceeding ramsize do not produce error in avr-gcc
In my source code I have tried to allocate a huge buffer exceeding the RAMSIZE value (RAM of my component (ATmega324PB) is 2k).
...
- 171
6
votes
7
answers
3k
views
Compress .hex file for micro-controller [closed]
I am currently writing a program in AVR Studio, here is the build *Memory Usage : *
...
- 223
1
vote
2
answers
5k
views
Can I use C++ stl in avr-gcc?
I have implemented C++ queue in my codes, those I run on my PC.
Now I'm programming an ATmega128 micro-controller to implement a .c code. Can I use that ...
- 123
-1
votes
2
answers
151
views
0
votes
1
answer
113
views
How to use output PWM in AVR
I have this code to blink an array (8-led) of led one after one:
...
- 123