Adding some test cases for the pre-processor. (Total hack, requires copying and pasting code from the actual app source into another file and running a shell script, but it's better than nothing.)

app/preproc/test/data/foo4.cpp

@@ -0,0 +1,132 @@
+//
+// Continually measures temperatures at three points using the Dallas DS18B20 on three
+// separate Arduino pins.
+//
+// Uses the parasitic power mode
+//
+// Displays to a serial LCD operating at 9600 baud.
+//
+// Arduino Board		DS18B20
+//
+//			  +5 VDC
+//			  |
+//			 4.7K
+// 8 ---------------- |----- 2 (DQ)  Note that terms 1 and 3 are grounded.
+//
+// 7 ---- same as above
+// 6 ---- same as above
+//
+// Tx ---------------------------- To Serial LCD (LCD #117)
+//
+// Peter H Anderson, Baltimore, MD, May 5, '07
+
+
+void setup()
+{
+  int n, dev_channel[3] = {8, 7, 6}, _1W_Pin;
+
+  for (n=0; n<1; n++)
+  {
+    _1W_Pin = dev_channel[n];
+    digitalWrite(_1W_Pin, LOW);
+    pinMode(_1W_Pin, INPUT);	// sets the digital pin as input (logic 1)
+  }
+  Serial.begin(9600);
+  delay(100);
+  Serial.print("?B40"); // set backlight intensity
+  delay(100);
+}
+
+void loop()
+{
+  int n, dev_channel[3] = {8, 7, 6}, _1W_Pin;
+  int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
+
+  for (n=0; n<3; n++)
+  {
+	_1W_Pin = dev_channel[n];
+	OneWireReset(_1W_Pin);
+	OneWireOutByte(_1W_Pin, 0xcc, 0);
+	OneWireOutByte(_1W_Pin, 0x44, 1); // perform temperature conversion, strong pullup for one sec
+
+	OneWireReset(_1W_Pin);
+	OneWireOutByte(_1W_Pin, 0xcc, 0);
+	OneWireOutByte(_1W_Pin, 0xbe, 0);
+
+	LowByte = OneWireInByte(_1W_Pin);
+	HighByte = OneWireInByte(_1W_Pin);
+	TReading = (HighByte << 8) + LowByte;
+	SignBit = TReading & 0x8000;  // test most sig bit
+	if (SignBit) // negative
+	{
+	   TReading = (TReading ^ 0xffff) + 1; // 2's comp
+	}
+	Tc_100 = (6 * TReading) + TReading / 4;    // multiply by (100 * 0.0625) or 6.25
+
+	Whole = Tc_100 / 100;  // separate off the whole and fractional portions
+	Fract = Tc_100 % 100;
+
+	if (n==0)  // if its the first time, clear the LCD
+	{
+	   Serial.print("?f");
+	   delay(100);
+	}
+
+	if (SignBit) // If its negative
+	{
+	  Serial.print("-");
+	}
+	Serial.print(Whole);
+	Serial.print(".");
+	if (Fract < 10)
+	{
+	  Serial.print("0");
+	}
+	Serial.print(Fract);
+	Serial.print("?n");
+  }
+  delay(5000);	// 5 second delay.  Adjust as necessary
+}
+
+void OneWireReset(int _1W_Pin) // reset.  Should improve to act as a presence pulse
+{
+	digitalWrite(_1W_Pin, LOW);
+	pinMode(_1W_Pin, OUTPUT); // bring low for 500 us
+	delayMicroseconds(500);
+	pinMode(_1W_Pin, INPUT);
+	delayMicroseconds(500);
+}
+
+void OneWireOutByte(int _1W_Pin, byte d, byte strong) // output byte d (least sig bit first).
+{
+   byte n;
+
+   for(n=8; n!=0; n--)
+   {
+	if ((d & 0x01) == 1)  // test least sig bit
+	{
+	   digitalWrite(_1W_Pin, LOW);
+	   pinMode(_1W_Pin, OUTPUT);
+	   delayMicroseconds(5);
+	   pinMode(_1W_Pin, INPUT);
+	   delayMicroseconds(60);
+	}
+	else
+	{
+	   digitalWrite(_1W_Pin, LOW);
+	   pinMode(_1W_Pin, OUTPUT);
+	   delayMicroseconds(60);
+	   pinMode(_1W_Pin, INPUT);
+	}
+
+	d=d>>1; // now the next bit is in the least sig bit position.
+   }
+   if(strong)
+   {
+	 digitalWrite(_1W_Pin, HIGH); // One sec of strong +5 VDC
+	 pinMode(_1W_Pin, OUTPUT);
+	 delay(1000);
+	 pinMode(_1W_Pin, INPUT);
+	 digitalWrite(_1W_Pin, LOW);
+   }
+}