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ARDUINO MEGA SERIAL PORT INTERRUPT SOFTWARE
These are far easier to use and far more efficient than any software serial library.
ARDUINO MEGA SERIAL PORT INTERRUPT HOW TO
Doubts on how to use Github Learn everything you need to know in this tutorial. Find anything that can be improved Suggest corrections and new documentation via GitHub. There are 4 hardware USARTs on the ATmega2560. The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3.0 License. Function of the interrupt pins is described on page 105 onwards of the datasheet. You can see these on the pin mapping diagram for the ATmega2560 (which is correct, AFAIK). The short list of: 2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2). The long list of: 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69Īre pin change interrupts which are what are required for NewSoftSerial (called SoftSerial in Arduino 1.0 and above). Pin change interrupts trigger as long as any change occurs.
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External interrupts are more complex and can be configured to trigger on rising and/or falling edges. With respect to the contradictory pins there are two types of interrupt pin on the ATmega2560 - external interrupts (INT7 - INT0) and pin change interrupts (PCINT23 - PCINT0). The Arduino’s default serial port should only be used for the debugging purposes. This limits the pins that it can work on though to ones that have pin change interrupts. While using the Arduino Uno or Arduino Nano even if you are using one serial device never use the Arduino’s default serial port for the communication with other devices. The Arduino comes with three timers known as Timer0. After the set commands are executed, the program resumes again from the same position. This uses interrupts and timers, and is far more efficient. Timer interrupts in Arduino pause the sequential execution of a program loop() function for a predefined number of seconds (timed intervals) to execute a different set of commands. This board is really pretty close from the Arduino Uno, with more pins. In Arduino version 1 and above, SoftSerial was replaced with NewSoftSerial. If you want to use more interrupts in your programs, you can switch to the Arduino Mega. I would strongly recommend avoiding this. It just uses millis(), digitalRead/Write and blocks when sending or receiving. This example makes use of one of Arduino Mega's 3 auxiliary serial. You can define the routine and specify conditions at the rising edge, falling edge or both. You can define a routine using a special function called as Interrupt Service Routine (usually known as ISR). Sometimes, one serial port just isn't enough When trying to communicate with multiple serial enabled devices, while also sending info back to the main serial window, a few extra RX/TX ports can be a welcomed thing. The Arduino Mega has six hardware interrupts including the additional interrupts ('interrupt2' through 'interrupt5') on pins 21, 20, 19, and 18. In Arduino version 0023 and below, SoftSerial was a very basic library written by David Mellis. Use two of the serial ports available on the Arduino Mega. The reason behind the discrepancy in documentation is that the documentation refers to two different versions of the software and it is out of date.