The IS31 includes 8 led pages (or frames) 0-7 than can be displayed, and each page consists of 144 bytes.
- **bytes 0 - 17** - LED control (on/off).
- * 18 pins which alternate between A and B matrices (A1, B1, A2, B2, ..).
+ * 18 bytes which alternate between A and B matrices (A1, B1, A2, B2, ..).
* Each byte controls the 8 leds on that pin with bits (8 to 1).
- **bytes 8 - 35** - Blink control.
* Same as LED control above, but sets blink on/off.
Remaining led control is done through the led mailbox using these message types:
- **SET_FULL_ROW** (3 bytes) - message type, 8-bit mask, and row#. Sets all leds on one pin per the bit mask.
- **OFF_LED, ON_LED, TOGGLE_LED** (3 bytes) - message type, led address, and page#. Off/on/toggle specific led.
-- **BLINK_OFF_LED, BLINK_ON_LED, BLINK_OFF_LED** (3 bytes) - message type, led address, and page#. Set blink Off/on/toggle for specific led.
+- **BLINK_OFF_LED, BLINK_ON_LED, BLINK_TOGGLE_LED** (3 bytes) - message type, led address, and page#. Set blink Off/on/toggle for specific led.
- **TOGGLE_ALL** (1 byte) - Turn on/off full backlight.
- **TOGGLE_BACKLIGHT** (2 bytes) - message type, on/off. Sets backlight completely off, no leds will display.
- **DISPLAY_PAGE** (2 bytes) - message type, page to display. Switch to specific pre-set page.
An example:
```c
-//set the message to be sent. First byte (LSB) is the led address, and second is the message type
+//set the message to be sent. First byte (LSB) is the message type, and second is the led address
msg=(42 << 8) | ON_LED;
//send msg to the led mailbox