Changes for page Front I/O

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...	...	@@ -194,6 +194,77 @@
194	194	* Power LED P3V3 - 3.30V
195	195	* Power LED - 0.87 V
196	196
	197	+= Controlling top I/O LED =
	198	+
	199	+On the top row we have the following input/output devices in order from left to right;
	200	+
	201	+Left side:
	202	+
	203	+* physical lock
	204	+* lock LED
	205	+* warning/service button
	206	+* warning/service LED
	207	+* locate button
	208	+* power LED (red & green)
	209	+* fan LED (red & green)
	210	+* temperature LED (red & green)
	211	+* compute LED (unknown)
	212	+
	213	+Right side:
	214	+
	215	+* power LED (red & green)
	216	+* fan LED (red & green)
	217	+* temperature LED (red & green)
	218	+* compute LED (unknown)
	219	+* lock switch
	220	+
	221	+Each sides bank of LEDs are driven by each their PCA9554 shift register. The registers represent the following LEDs: (Note that Lock LED is only present for the LEFT side)
	222	+
	223	+(% border="1" %)
	224	+|=(% scope="row" %)Register|1|2|3|4|5|6|7
	225	+|=Device|Power LED Green|Power LED Red|Fan LED Green|Fan LED Red|Temperature LED Green|Temperature LED Red|Lock LED
	226	+
	227	+To control each LED we shift either a 0 to turn off or 1 to turn on. Since each device shares a single red/green LED (power LED green & power LED red) setting both to 1 at the same time will always leave it red. That is when power LED green and power LED red are both enabled, red always takes precedence.
	228	+
	229	+Use following script to power LEDs one at a time:
	230	+
	231	+{{code language="c++"}}
	232	+#include <PCA9554.h> // Load the PCA9554 Library
	233	+
	234	+PCA9554 ioCon1(0x24); // Create an object at this address
	235	+
	236	+uint8_t mapIO = 0b10000000;
	237	+
	238	+void shiftL() {
	239	+ mapIO = (mapIO << 1) | ((mapIO & 0x80) >> 7);
	240	+}
	241	+
	242	+void write() {
	243	+ Serial.println("writing to PCA9554 device");
	244	+
	245	+ for (int i = 0; i < 8; ++i) {
	246	+ ioCon1.digitalWrite(i, (mapIO & (1 << i)) ? 0 : 1);
	247	+ }
	248	+}
	249	+
	250	+void setup()
	251	+{
	252	+ Serial.begin(9600);
	253	+ Serial.println("Setup");
	254	+
	255	+ ioCon1.portMode(ALLOUTPUT);
	256	+}
	257	+
	258	+void loop()
	259	+{
	260	+ write();
	261	+ shiftL();
	262	+
	263	+ delay(500);
	264	+}
	265	+{{/code}}
	266	+
	267	+
197	197
198	198	)))
199	199