Import Tlc5940 version r014_2

examples/CircularLightBuffer/CircularLightBuffer.pde

@@ -0,0 +1,48 @@
+/*
+    A circular light buffer.  If you manage to construct a circle of LEDs,
+    definitely send in pictures.  What this sketch does is take an analog
+    reading off of analog pin 0 and add it to the current value of the last LED.
+    If the resultant sum is greater than 4095, it turns the LED off,
+    otherwise sets LED 0 to the value of the sum.
+
+    If you ground pin 12, it will set LED 0 to zero.
+
+    Then it shifts all the LED values up one (so LED 0 becomes LED 1) and sets
+    LED 0 to the value shifted off the last LED (so if one LED is on, it will
+    go in a circle forever).
+
+    See the BasicUse example for hardware setup.
+
+    Alex Leone <acleone ~AT~ gmail.com>, 2009-02-04 */
+
+#include "Tlc5940.h"
+#include "tlc_shifts.h"
+
+// which analog pin to use
+#define ANALOG_PIN      0
+
+// which pin to clear the LEDs with
+#define CLEAR_PIN      12
+
+// how many millis for one full revolution over all the LEDs
+#define SCOPE_PERIOD    (2000 * NUM_TLCS)
+#define LED_PERIOD      SCOPE_PERIOD / (NUM_TLCS * 16)
+
+void setup()
+{
+  pinMode(CLEAR_PIN, INPUT);
+  digitalWrite(CLEAR_PIN, HIGH); // enable pull-up
+  Tlc.init();
+}
+
+void loop()
+{
+  // shiftUp returns the value shifted off the last pin
+  uint16_t sum = tlc_shiftUp() + analogRead(ANALOG_PIN) * 4;
+  if (digitalRead(CLEAR_PIN) == LOW || sum > 4095)
+    sum = 0;
+  Tlc.set(0, sum);
+  Tlc.update();
+  delay(LED_PERIOD);
+}
+