void write_led_byte (uint8_t page, uint8_t row, uint8_t led_byte);
void write_led_page (uint8_t page, uint8_t *led_array, uint8_t led_count);
// constants for signaling the LED controller thread
enum led_msg_t {
KEY_LIGHT,
void write_led_byte (uint8_t page, uint8_t row, uint8_t led_byte);
void write_led_page (uint8_t page, uint8_t *led_array, uint8_t led_count);
// constants for signaling the LED controller thread
enum led_msg_t {
KEY_LIGHT,