A good chunk of that is the Tx and Rx buffers for the serial data.If you need more SRAM, consider the '1284P - 16 Kbyte of SRAM, twice what the '2560 has. Dual serial ports, 32 IO lines.I have a nice Duemilanove style board for the 366/644/1284 series of chips.http://www.crossroadsfencing.com/BobuinoRev17/Can use onboard FTDI module, mikroe483 from mouser.com, or offboard with FTDI Cable, FTDI Basic, or similar CP2102 module.
I have not seen any problems with 1.0. I tend not to use many libraries - Serial, SPI, I2C, VirtualWire are about it. Anything else, I read the datasheet and write my own stuff.Maybe I'll look into 1284 kits after tax season. I can't take that on right now. Got fencing club taxes, personal taxes, college financial aid forms, and a 56 seven-segment display project to finish first.Just delivered another 10 Mega screwshields, those are pretty popular. Board & 4 connector types, easy to package up, no ESD concerns.
Only question I have is the intended purpose of the 6 pin header in the corner of the board. Not real clear to me from the schematic what pins it actually breaks out? So far I didn't put header pins on it.
Sorry, missed that one - it's to select whether A4/D18 & A5/D19 show up on the Analog header pins, or whether SDA/SCL show up there.I would put male pins there with two 2-pin jumpers like these to select.http://www.dipmicro.com/store/JUMPER2
Well if it's compiling for a mega board then it defines serial send and rec software buffers (in SRAM) for all four possible hardware serial ports even if you aren't using them. Others have complained of this behaviour but don't know if more intelligent method is forthcoming.Lefty
Does the ATtiny45 need to receive data or just send?
Is it possible for multiple ATtiny45s to transmit simultaneously on the same wire?