here is the code from my diagnose_touchpins sketch. the one not reporting anything but the initial print text.
void showpins(int A, int D, int value, const char *msg)
{
Serial.print(msg);
Serial.print(" (A" + String(A - A0) + ", D" + String(D) + ") = ");
Serial.println(value);
}
void setup()
{
int i, j, value, Apins[2], Dpins[2], Values[2], found = 0;
Serial.begin(9600);
Serial.println("Making all control and bus pins INPUT_PULLUP");
Serial.println("Typical 30k Analog pullup with corresponding pin");
Serial.println("would read low when digital is written LOW");
Serial.println("e.g. reads ~25 for 300R X direction");
Serial.println("e.g. reads ~30 for 500R Y direction");
Serial.println("");
for (i = A0; i < A5; i++) pinMode(i, INPUT_PULLUP);
for (i = 2; i < 10; i++) pinMode(i, INPUT_PULLUP);
for (i = A0; i < A4; i++) {
for (j = 5; j < 10; j++) {
pinMode(j, OUTPUT);
digitalWrite(j, LOW);
value = analogRead(i); // ignore first reading
value = analogRead(i);
if (value < 100) {
showpins(i, j, value, "Testing :");
if (found < 2) {
Apins[found] = i;
Dpins[found] = j;
Values[found] = value;
found++;
}
}
pinMode(j, INPUT_PULLUP);
}
}
if (found == 2) {
Serial.println("Diagnosing as:-");
for (i = 0; i < 2; i++) {
showpins(Apins[i], Dpins[i], Values[i], (Values[i] < Values[!i]) ? "XM,XP: " : "YP,YM: ");
}
}
}
void loop()
{
// put your main code here, to run repeatedly:
}