update pinreadwrite and do phase 2

we discovered a missing but needed function, pinWrite() that was added.
first cut on phase 2 with the tilt switch. using an LED because the
buzzer is pretty anoying. Drives the cats nuts as well.

project11/tiltbuzz_2.c

@@ -0,0 +1,56 @@
+
+#include <wiringPi.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "lcd1602.h"
+#include "pinreadwrite.h"
+
+int main (int argc, char *argv[])
+{
+        // BUZZPIN is wiringPi Pin #1 or physical pin #12 or GPIO #18
+        int BUZZPIN = 0;
+	int SW520DPIN = 2;
+
+	if (wiringPiSetup() == -1) {
+		printf ("Setup wiringPi Failed!\n");
+		return -1;
+	}
+
+	lcd1602Open (0x27);
+
+	pinSetupWrite (BUZZPIN, LOW);
+	pinSetupRead (SW520DPIN);
+
+	lcd1602Write (0, 0, "Welcome to tiltbuzz_1");
+	delay (2000);
+
+	lcd1602Clear ();
+
+	int  iCount = 20;
+	for ( ; iCount > 0; iCount--) {
+		int  iDelay = ((iCount % 5) + 1) * 400;
+		char buffLines[2][24];
+
+		// LOW means Vertical, HIGH means tilted.
+		int iTilt = pinRead (SW520DPIN);
+
+		sprintf (buffLines[0], "tiltbuzz_2 %2.2d", iCount);
+		sprintf (buffLines[1], "SW520D  %d", iTilt);
+		lcd1602Write (0, 0, buffLines[0]);
+		lcd1602Write (0, 1, buffLines[1]);
+
+		// if Vertical then ok, no indicator. if tilt then indicate.
+		pinWrite (BUZZPIN, ((iTilt) ? 0 : 1));
+		delay (2000);
+	}
+
+	// clean up the GPIO resources we have been using.
+	// make sure that things are back to a good state before exit.
+	pinCleanup (BUZZPIN);
+	pinCleanup (SW520DPIN);
+	lcd1602Close();
+
+	delay (500);
+	return 0;
+}