![]() ![]() If you go this route chances are you’ll upgrade before long so don’t agonize of the design details. In retrospect it may have been a better choice to use a 2×3 IDC connector and route the signals using the AVR ISP standard (from AVR: In-System Programming PDF). This is easy to plug into a pin header or connect to jumper wires as shown above. On the other end of the ribbon cable I used a connector housing with six slots, filling one of them with a blank so that I could keep track of the signals. I used a piece of ribbon cable, soldering one end to each of the five signal lines shown in the schematic. I did not use a resistor on the ground pin. As you can see in the schematic, I’ve used 1 kilo Ohm resistors on the Reset, SCK, MISO, and MOSI pins for current protection. It connects to a computer using a DB25 connector. But if you want to go for it anyway, here’s how I built mine. ![]() There’s also the possibility of damaging your parallel port or worse if you do something wrong. If you try to run the chip’s clock at full speed (by changing fuse settings… more in Part 3) you won’t be able to use a DAPA cable to talk to it any longer. That is, until I discovered another gotcha. In fact, the first AVR prototyping I did was with one of these cables. But if you’ve got an old PC around that has one this will get you up and programming in no time. The first is that you must have a parallel port on your computer something that modern laptop and some modern desktops don’t have. You can build one very quickly for a few bucks worth of parts, but the convenience comes with a few gotchas. We are focusing on In-System Programming (ISP) which means that you can program the chip without removing it from the circuit.Ī Direct AVR Parallel Access, or DAPA cable, is an incredibly simple and cheap programming method. There are a huge number of options, but I’ll cover a few of the easiest and least expensive. AVR Programming 03: Reading and compiling codeĪs I said before, if you want to get it on the chip you’ve got to have a programmer. ![]() If you missed Part 1 take a few minutes to review that portion of the tutorial and then join us after the break.
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