![]() ![]() ![]() ![]() Why does the documentation claim that it uses 50,51 and 52 when these are never connected while the shield is nested on the mega?.Does anybody have the ICSP pinout for both of these devices? My best guess is that something isn't lined up correctly on the DIN rail board. ![]() What pins am I missing to make this work? Aside from connecting all of them and then slowly eliminating one by one I don't see anything else I'm missing.Again, If I pull the boards out of the DIN rail mounts and stack them together the code runs as expected so it's not a firmware problem it's just a hardware connection but I don't see what I'm missing. Pins 13,12, 11, 10 and 4 connected via the black wires at the bottom but I'm still not able to initialize the SD card when I'm in this configuration. In the picture above, I have the ICSP Header connected via the ribbon cable. So communication is through the ICSP Header. On the Mega, the hardware SS pin, 53, is not used to select either the W5500 or the SD card, but it must be kept as an output or the SPI interface won't work. These pins cannot be used for general I/O. On both boards, pin 10 is used to select the W5500 and pin 4 for the SD card. This is on digital pins 10, 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. Reading the documentation of the Ethernet Shield 2 I see this:Īrduino communicates with both the W5500 and SD card using the SPI bus (through the ICSP header). Have a look at Step 2, Load MegaCore with Optiboot as the Boot Loader for a Mega 2560.OK so now for where I'm confused. If you run into issues, though, the forums say sometimes there’s not enough power and you may need to power the target board separately. The 5v of power should be sufficient from the programmer board to power the target board. In addition, the Arduino tutorial referenced above has instructions to use pins 7, 8, and 9 as indicators of the burning process if you’re interested, but I won’t go into them here. Since five of these wires are straight through, you might use a six pin connector and simply cut pin 5 and solder on a jumper. The reset pin of the target Mega 2560 must be wired to pin 10 of the programmer Mega 2560. You can simply wire jumpers from board to board using these pins with a single exception. The pins are laid out as follows: The ICSP pin configuration. Note the white mark in the upper left corner marking pin 1. This is a 2 x 3 group of pins next to the processor. The Mega 2560 enlarged to show detail of ICSP headers and the white dot marking pin 1 in the upper left corner.įirst, have a look at your Mega 2560 and find the ICSP pins. Note there are similar six pins near the USB, but these are not used in this process. The ICSP Pins A Mega 2560 board with the ICSP headers highlighted in orange. You can either do this with six wire jumpers or a standard six pin cable and a little surgery. This tutorial will show you how to use another Mega 2560 to replace the boot loader of a Mega 2560. The first step in replacing the boot loader on an Arduino board is having an In System Programmer (ISP). This is the first step in the series Code Loading an Arduino over Bluetooth. ![]()
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