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I opted for the G840 model, which has an external power supply.After a couple of hours playing with it, I can share some first tips, and have one big question: So far, it has lived up to my expectations.
I opted for a Chinese Genius G840 USB programmer $80 shipped from ebay. But given the fact that I wil use it rarely, I wanted to keep costs down. So I figured it's time to buy a new programmer. Occasionally (alright, most times) I forget to burn the bootloader first and jump right into downloading a sketch, which then runs ridicuously slow and I frantically check my wiring & stuff, and after a halfhour I recall that I didn't do anything with the fuses.My homebrew EPROM and GAL programmers are both from the early 90s, require a parallel port on the PC, and refuse to support any more recent chips. Then File:Upload Using Programmer if you want your sketch to start immediately after a Reset and not have any bootloader delay.Ītmel Studio does the fuses &lockbits & bootloader quicker, but all the time waiting for it to open offsets that. That sets the fuses for 16 MHz operation too. Select Tools:Board:your 1284 board type (I use Bobuino for mine),Īnd select Tools:Burn Bootloader.
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Power up the board (can be a 3 AA battery pack even MKii only monitors the power line unless you mod it to connect USB 5V pin to the 5V header pin),
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You can download Atmel Studio if you like, I find under WinVista it takes ages to start up, so I stopped using it to set up 1284s.Ĭonnect it to the SPI pins, reset, +5, Gnd (or plug it onto the ICSP header that you included in your design),
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You've got the greatest write-ups Nick, wish I had time to create that kind of depth & detail.ĪVR ISP MKii is easy to use once you get the drivers in place for the IDE.
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Later discovered a mismatch with bootload expected speed and PC speed during serial downloads was the culprit (I may have forgotten to set the fuses too) but I never went back to using the MDFLY programmer and can’t find it at the moment.
I was having problems after bootloading at some point and switched to the MKii. Wow- price has gone up again - was only $33 when I bought mine originally. Yes, you can not have a bootloader and program the chip with an AVR ISP programmer using File:Upload Using Programmer, just like all the other Arduino boards. Huh? The bootloader is what lets Arduino program the chip via the serial interface, just like all the other Arduino boards. Whats the reason for needing a bootloader on this mega chip? could you not have a bootloader but still use arduino IDE to program the uC? Just needed a line commented out, you can see it under the diagram of the pinout in the file. There was something about SPI that the pins_arduino.h takes care of too, like it was being called out twice & causing compile errors when Arduino went from -0023 to 1.0. Not sure where you are looking, I can assure you everything is labelled. USB/Serial modules are so inexpensive I wouldn’t bother. Usually need a USB-A to USB-A male-female extension cable. tinyos electronics, Haven’t even opened them up yet.ĬP2102 based modules work as well. Once the bootloader is loaded, then loading sketches via serial interface is done just like any other Arduino board - external USB/Serial adapter, or on-board USB/Serial adapter.įTDI based modules are readily available, I just received 2 in the mail yesterday, each came with a short USB A to USB- Mini B cable as well. I’m not sure what pin might toggle otherwise with the bootloader. The copy I use may have been tweaked to have the SCK pin toggle like a Duemilanove/Uno does. Mighty1284 might be the only bootloader available to burn. (vs the pins all crisscrossing as they got routed) This may have been from flipping the analog pin assignments end for end so that the analog pin located near the middle of a DIP part could be routed direct to the A0 header, continuing out to A6 & A7 (added from Uno) at the corner of the board. #define analogPinToChannel(p) ( (p) < NUM_ANALOG_INPUTS ? (NUM_ANALOG_INPUTS-1) - (p) : -1 ) // test to see if A0-A7 are off by 1Ī0-A7 were responding as if A1-A8 were being accessed. #define analogPinToChannel(p) ( (p) < NUM_ANALOG_INPUTS ? NUM_ANALOG_INPUTS - (p) : -1 ) Analog pin wrapping: There was a problem with this line