All Questions
13 questions
0
votes
1
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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 ...
- 479
1
vote
2
answers
287
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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 ...
- 479
0
votes
0
answers
57
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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 ...
- 49
0
votes
1
answer
266
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USART ISR on TXC breaking delays from <util/delay.h>?
I am trying to work out USART ISR's on the ATmega 328P. So far I have got the USART rx and tx working. I have come across a strange issue when it comes to the UART ISR's, though. The ISR seems to ...
user160044
0
votes
1
answer
721
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Using UDRIE0 interrupt in ATmega168
I only have some limited knowledge in interrupts.
This is what I understand about following ISR functions
ISR(USART_RX_vect) will get called when a new data ...
- 241
1
vote
2
answers
543
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USART ISR keeps repeating 4 times
Hi,
I'm having a problem with the USART_RX_vect interrupt of the ATMega 328p. The receiving works fine and I'm able to evaluate the sent bits (so it's not due to the baudrate) but everytime I send a ...
- 11
0
votes
0
answers
294
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How can I echo characters from UART0 to UART1
I am looking for a good tutorial or help in working with two UART's at the same time. I have UART1 connected to a BT modem and UART0 connected to a cell modem. I want to be able to have good two way ...
- 135
0
votes
1
answer
971
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Timer causes UART problem
I have a problem, found on both ATMEGA1284P and ATMEGA2560.
I have set a 16-bit timer in CTC (tried both Timer1 and Timer5) to give an interrupt every 1ms so I can increment a 32-bit volatile time ...
- 247
2
votes
0
answers
993
views
AVR interrupt setup seems to stop program execution
On ATMEGA168PA I have problems with interrupt-driven character reception over UART. When I include the line setup_interrupt() it seems that program execution stops ...
6
votes
3
answers
10k
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How to read whole data sent to USART with interrupt?
I am currently able to read byte by byte from USART with this code
...
- 209
3
votes
1
answer
2k
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AVR USART Random Behaviour
I seem to be getting random character in my USART output with an ATMEGA8
uart.c
...
- 1,761
0
votes
1
answer
2k
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AVR Atmega8 USART and ADC and PWM
I have created 2 different PWMs using timer 1 and 2 on ATmega8, that is used to control a linear motor. I'm using a hall effect sensor to detect changes in voltage as the linear motor moves left and ...
- 623
4
votes
3
answers
7k
views
AVR ADC performance: interrupts vs. manual conversion
I have a device on ATMega16 microcontroller that is supposed to constantly send ADC measurement results over USART. The controller is operating at 16MHz with an external crystal and ADC prescaler is ...
- 811