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OK, here goes: How to set registers with bitwise operators on the AVR. Let's unpack the _BV() macro and PCx definitions for a moment. _BV(x) is simply 1 << x. …

According to the AVR Instruction Set manual, the opcode for rjmp is 1100 kkkk kkkk kkkk, or, in hex, 0xCK KK, where the concatenation of K is k, our relative jump. … The AVR we're using is little-endian, so 00 C0 as seen in the program is a relative jump (C) to a position 0 bytes away. …

function (in a very rough way) in the main function like this: #include <stdint.h> // Typedefs `unsigned long` or something to `uint16_t`, // a 16-bit unsigned number #include <avr … To poll from a loop, you'd do something like this: #include <avr/io.h> int main (void) { DDRB = 0xFF; // Set port as output TCCR1B |= _BV(CS10); // Set up timer while(1) { / …

The const char javascript[] PROGMEM = "..." is a >5,000 character string. It's possible that the Arduino IDE doesn't support line lengths of this size, you can break it up using the continuation char …

The AVR, like most microcontrollers, uses memory-mapped IO. In a nutshell, this means that a part of the memory space of the microcontroller is reserved for the peripherals. … To understand the details of how this works on your AVR, the Special Function Registers section of AVR-libc (and, more importantly, sfr_defs.h and iom328p.h) are recommended reading. …

Be aware that this kind of hardware is much more difficult to design than an 8-bit AVR. I'm a computer engineering student with a computer science minor. … It can run on many AVR chips, it's definitely not restricted to their hardware. It will give you an easier learning curve than just jumping straight into C. …

However, it's more difficult to do this with microcontrollers, because the code isn't usually portable from, say, a PIC to an AVR, without a LOT of work. …

The easiest way to interact with an AVR over USB would be to connect an FTDI FT232 to the UART, and then interact with your AVR as a virtual COM port using the FTDI drivers. …

I've used the Lantronix XPort Pro (Ethernet) before...very straightforward, and excellent support staff. If you use the Matchport, call them! In my research, I also found the Digi Connect Wi Me, but …

How bad do you to use the XMega? If the crypto and random number generation are a big part of your project, Atmel's SecureAVR series has a hardware random number built in, and is designed for cryptog …

I really hope somebody knows this, and that you get a straightforward answer with good reasoning from the docs, examples of how to plan for simultaneous interrupts, etc. but all I can tell you right n …