I struggle to make a simple network testing gadget with the Arduino Portenta H7 breakout board
I wanted to make a simple, small device, with a single ethernet port just to acquire an IP address & display it on a small screen. This would serve as an easy-to-use network-debugging device & teaching tool.
I had thought the Portenta Breakout board with the Portenta H7 might work, considering the ethernet port.
This is the segment I used to initialize the ethernet device & acquire an IP address via DHCP:
#include <SPI.h>
#include <Ethernet.h>
// Unique MAC address for your device
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
void setup() {
Serial.begin(9600);
// Attempt to get an IP address via DHCP
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// Handle failure (e.g., stop execution or try static IP)
while (1);
}
// Print the assigned IP address
Serial.print("My IP address: ");
Serial.println(Ethernet.localIP());
}
void loop() {
// Maintain the DHCP lease (essential for long-running projects)
Ethernet.maintain();
delay(1000);
Serial.print(".");
}It worked the first try, fortunately.
I tried to connect my LCD display to the display pins.
Since I had the display's "Reset" pin to the breakout-board's "D2N" pin, I tried compiling the following line
LiquidCrystal lcd(D2N, 0, 0, 0, 0, 0);And I saw the following compilation error:
error: 'D2N' was not declared in this scopeD2N is not defined. Why would it be labeled that? Maybe it's defined in some library somewhere...
arduino-cli lib search portenta\ breakoutI installed the "Arduino_PortentaBreakout" library, however, I still saw the same message:
error: 'D2N' was not declared in this scopeWhat's the point of the library? I look at the header file, and see the following segment:
...
DISPLAY_D3P = -1,
DISPLAY_D3N = -1,
DISPLAY_D2P = -1,
DISPLAY_D2N = -1,
DISPLAY_D1P = -1,
DISPLAY_D1N = -1,
DISPLAY_D0P = -1,
DISPLAY_D0N = -1,
...Not so useful... I tried using the DISPLAY_D2N variable:
LiquidCrystal lcd(DISPLAY_D2N, 0, 0, 0, 0, 0);And saw:
error: 'DISPLAY_D2N' was not declared in this scopeTracing the connections from the board to the jumpers, it looks like the display pins are pins 2, 4, 6, 8, 10, 12, 14 & 16 on J1 here:
If anyone knows how those pins are defined in Arduino SDK, please let me know!
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