- #Atmel dragon pinout serial
- #Atmel dragon pinout manual
- #Atmel dragon pinout code
So apparently, Atmel didn’t feel the need to put the Dragon’s users manual on its product page? After finally resorting to searching through Google, I managed to find the users manual in Atmel’s online help system, which quickly lead me to what I was looking for. I’ll just pull up the manual and figure out what the on-PCB pinout looks like…
So the bottom third of the board’s real estate dedicated to empty headers threw me for a loop until I noticed the sentence in the description, “A development area lets designers build their own circuitry or add sockets for the desired device footprint.”įair enough I can load the bottom of my Dragon with a socket and make it an AVR target board.
And below the three programming interfaces… six rows of unpopulated, unlabeled, headers? Uhhh…. This is most useful when you want to use the reset pin as an IO pin (did you ever wonder why Atmel bothers assigning an IO port number to the reset pin?). The HV_PROG interface allows you to burn AVRs like old-school EEPROMs, and allows you to get around having to use the SPI ISP bus for programming. The second row has your 10 pin JTAG and 6 pin ISP headers, which are your two work-horse programming interfaces for AVRs big and small, and finally an unpopulated high voltage programming interface. The first row has 3x Vcc and 3x GND, which seems a little strange for a programmer, but might be handy for some projects?. Looking at the headers from the top of the board: I’d like to have seen the pin-out references on the top, particularly since they’re oriented for “top view,” but it’s still a handier reference than the printout I have floating around in one of my electronics binders. Nice touch on the backside silk screen logo. Look at that minimally wasted space! ESD foam on top and bottom, so over all, I’m happy with the packaging, which is surprisingly important when you literally have an entire closet dedicated to development kits collected over the years. I’ll actually be able to store this thing in its box instead of having to shuck it and store the PCB floating around in gallon ziplocks like most of my other dev kits. When I first opened the shipment from Atmel, I was very happy to see a piece of dev kit finally come in a reasonably sized, and attractive, box. This makes embedded development MUCH easier, and an ability I’ve been suffering without while my projects have grown progressively more sophisticated. All those glorious interactive debugging features that computer programmers have been spoiled with for decades. Most of the third-party programmers only implement the basic SPI-based erase-and-burn cycle you use when programming an AVR, but OCD allows you to set break-points in your program on the actual chip, and then step through your program code, read variable values, etc. A typical example of an ISP programmer, and what I’ve been using exclusively up until now, is the wonderful, if sometimes a bit flaky, AdaFruit USBtinyISP.Īs you look back through my blog, you can probably tell that only having ISP capabilities will get you pretty far, but where the Dragon really shines is in its ability to perform on-chip debugging. #Atmel dragon pinout code
The ISP functionality is familiar to most hobbyists in the AVR embedded programming scene through the standard 2×3 pin header, you can erase the flash memory on an AVR and download new program code onto the chip.
#Atmel dragon pinout serial
One of my good friends at Atmel, Paul Rako, recently sent me a sample of the AVR Dragon ( Atmel store page), which is a in-circuit serial programmer (ISP) and On-Chip Debugger (OCD). He did a great job, and posted it on his website, with the understanding I would just cut-and-paste it to Bits and Pieces. I got him a deal through our University program and asked if he would write a review when he got the board. The Dragon works with most AVR microcontrollers. It makes it way easy to troubleshoot what is going wrong with your program. You can read its internal registers and see memory values. A debugger is a gizmo that lets you see “inside” a chip. So he asked me if I could get him an AVR Dragon, a debugger board Atmel sells. Now he wants to get an MSEE with an emphasis in networking embedded systems. I met a great engineer at the eFlea electronic flea market here in Silicon Valley.
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