Changes for page Front I/O

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...	...	@@ -277,7 +277,164 @@
277	277	There are 4 words, each containing 7 data bits. They do not
278	278
279	279
	280	+= Controlling center LED columns =
	281	+
	282	+There are a total of 4 banks of addressable LED's 12 each of the total 48.
	283	+
	284	+|=Register Banks|=LEDs|=Count
	285	+|=Bank 1|1 2 4 6 8 10 12|7
	286	+|=Bank 2|3 5 7 9 11 13|6
	287	+|=Bank 3|14 16 18 20 22 23 24|7
	288	+|=Bank 4|15 17 19 21|4
	289	+
	290	+Script for writing all permutations to display:
	291	+
	292	+{{code language="c++"}}
	293	+#include "Wire.h" // enable I2C bus
	294	+
	295	+byte saa1064 = 0x3B; // define the I2C bus address for our SAA1064 (pin 1 to GND) ****
	296	+
	297	+void setup()
	298	+{
	299	+ Wire.begin(); // start up I2C bus
	300	+}
	301	+
	302	+void write(int value) {
	303	+ Wire.beginTransmission(saa1064);
	304	+ Wire.write(1);
	305	+
	306	+ Wire.write(value);
	307	+ Wire.write(value);
	308	+ Wire.write(value);
	309	+ Wire.write(value);
	310	+
	311	+ Wire.endTransmission();
	312	+}
	313	+
	314	+void loop() {
	315	+ for (int value = 0; value < 127; value++) {
	316	+ write(value);
	317	+ delay(300);
	318	+ }
	319	+}
	320	+{{/code}}
	321	+
	322	+Since LED positions don't map sequentially with LED number we can't address them in 10-base form, but we can define each LED in binary and use OR operator to display LEDs we want.
	323	+
	324	+{{code language="c++"}}
	325	+#include "Wire.h" // enable I2C bus
	326	+
	327	+#define TCAADDR 0x70
	328	+byte saa1064 = 0x3B; // define the I2C bus address for our SAA1064
	329	+
	330	+byte bank1;
	331	+byte bank2;
	332	+byte bank3;
	333	+byte bank4;
	334	+
	335	+byte activityLED = 0b00000001;
	336	+byte leds[23][4] = {
	337	+ {0b00000010, 0b00000000, 0b00000000, 0b00000000}, // 1
	338	+ {0b00000000, 0b00000010, 0b00000000, 0b00000000}, // 2
	339	+ {0b00000100, 0b00000000, 0b00000000, 0b00000000}, // 3
	340	+ {0b00000000, 0b00000100, 0b00000000, 0b00000000}, // 4
	341	+ {0b00001000, 0b00000000, 0b00000000, 0b00000000}, // 5
	342	+ {0b00000000, 0b00001000, 0b00000000, 0b00000000}, // 6
	343	+ {0b00010000, 0b00000000, 0b00000000, 0b00000000}, // 7
	344	+ {0b00000000, 0b00010000, 0b00000000, 0b00000000}, // 8
	345	+ {0b00100000, 0b00000000, 0b00000000, 0b00000000}, // 9
	346	+ {0b00000000, 0b00100000, 0b00000000, 0b00000000}, // 10
	347	+ {0b01000000, 0b00000000, 0b00000000, 0b00000000}, // 11
	348	+ {0b00000000, 0b01000000, 0b00000000, 0b00000000}, // 12
	349	+ {0b00000000, 0b00000000, 0b00000001, 0b00000000}, // 13
	350	+ {0b00000000, 0b00000000, 0b00000000, 0b00000001}, // 14
	351	+ {0b00000000, 0b00000000, 0b00000010, 0b00000000}, // 15
	352	+ {0b00000000, 0b00000000, 0b00000000, 0b00000010}, // 16
	353	+ {0b00000000, 0b00000000, 0b00000100, 0b00000000}, // 17
	354	+ {0b00000000, 0b00000000, 0b00000000, 0b00000100}, // 18
	355	+ {0b00000000, 0b00000000, 0b00001000, 0b00000000}, // 19
	356	+ {0b00000000, 0b00000000, 0b00000000, 0b00001000}, // 20
	357	+ {0b00000000, 0b00000000, 0b00010000, 0b00000000}, // 21
	358	+ {0b00000000, 0b00000000, 0b00100000, 0b00000000}, // 22
	359	+ {0b00000000, 0b00000000, 0b01000000, 0b00000000} // 23
	360	+};
	361	+
	362	+void setup()
	363	+{
	364	+ Serial.begin(9600);
	365	+ Wire.begin(); // start up I2C bus
	366	+
	367	+ Serial.println("setting up ports");
	368	+}
	369	+
	370	+void tcaselect(uint8_t i) {
	371	+ if (i > 7) return;
280	280
	373	+ Wire.beginTransmission(TCAADDR);
	374	+ Wire.write(1 << i);
	375	+ Wire.endTransmission();
	376	+}
	377	+
	378	+void selectLeft() { tcaselect(2); }
	379	+void selectRight() { tcaselect(1); }
	380	+
	381	+void write() {
	382	+ Wire.beginTransmission(saa1064);
	383	+ Wire.write(1);
	384	+
	385	+ Wire.write(bank1);
	386	+ Wire.write(bank2);
	387	+ Wire.write(bank3);
	388	+ Wire.write(bank4);
	389	+
	390	+ Wire.endTransmission();
	391	+}
	392	+
	393	+void resetBanks() {
	394	+ bank1 = 0;
	395	+ bank2 = 0;
	396	+ bank3 = 0;
	397	+ bank4 = 0;
	398	+}
	399	+
	400	+void displayNumber(int number) {
	401	+ bank1 = leds[number - 1][0];
	402	+ bank2 = leds[number - 1][1];
	403	+ bank3 = leds[number - 1][2];
	404	+ bank4 = leds[number - 1][3];
	405	+}
	406	+
	407	+void displayUpToNumber(int number) {
	408	+ for (int i = 0; i < number; i++) {
	409	+ bank1 = bank1 | leds[i][0];
	410	+ bank2 = bank2 | leds[i][1];
	411	+ bank3 = bank3 | leds[i][2];
	412	+ bank4 = bank4 | leds[i][3];
	413	+ }
	414	+}
	415	+
	416	+void computeEthernetActivity() {
	417	+ bank1 = bank1 | activityLED;
	418	+}
	419	+
	420	+void loop() {
	421	+ resetBanks();
	422	+ delay(10);
	423	+
	424	+ displayUpToNumber(15);
	425	+ computeEthernetActivity();
	426	+
	427	+ selectLeft();
	428	+ write();
	429	+ delay(2);
	430	+
	431	+ selectRight();
	432	+ write();
	433	+ delay(1000);
	434	+}
	435	+{{/code}}
	436	+
	437	+
281	281	)))
282	282
283	283