verifyJumperWire()

bool verifyJumperWire	(	int	pin_tx,
		int	pin_rx )

Verify jumper wire connection between TX and RX pins.

Tests that a physical jumper wire correctly connects the TX and RX pins by setting TX HIGH/LOW and verifying RX reads the same values.

Parameters

pin_tx	TX pin number (output pin)
pin_rx	RX pin number (input pin)

Returns

true if jumper wire is working correctly, false otherwise

Definition at line 7 of file test.cpp.

                                              {
    FL_WARN("Verifying jumper wire connection between GPIO " << pin_tx << " and GPIO " << pin_rx << "...");
 
    pinMode(pin_tx, OUTPUT);
    pinMode(pin_rx, INPUT);
 
    // Test HIGH
    digitalWrite(pin_tx, HIGH);
    delay(1);  // Allow signal to propagate
    int rx_high = digitalRead(pin_rx);
 
    // Test LOW
    digitalWrite(pin_tx, LOW);
    delay(1);  // Allow signal to propagate
    int rx_low = digitalRead(pin_rx);
 
    if (rx_high != HIGH || rx_low != LOW) {
        FL_ERROR("Jumper wire sanity check FAILED!");
        FL_ERROR("  digitalWrite(TX=" << pin_tx << ", HIGH) → digitalRead(RX=" << pin_rx << ") = " << rx_high << " (expected HIGH=1)");
        FL_ERROR("  digitalWrite(TX=" << pin_tx << ", LOW)  → digitalRead(RX=" << pin_rx << ") = " << rx_low << " (expected LOW=0)");
        FL_ERROR("");
        FL_ERROR("REQUIRED: Physically connect GPIO " << pin_tx << " to GPIO " << pin_rx << " with a jumper wire!");
        return false;
    }
 
    FL_WARN("✓ Jumper wire verified: GPIO " << pin_tx << " → GPIO " << pin_rx << " signal path working");
    return true;
}

References FL_ERROR, and FL_WARN.

Referenced by setup().

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