// (eg. from a timer interrupt).
// Call this while idle (in between matrix scans).
// If the buffer is dirty, it will update the driver with the buffer.
-void IS31FL3731_update_pwm_buffers( uint8_t addr1, uint8_t addr2 );
-void IS31FL3731_update_led_control_registers( uint8_t addr1, uint8_t addr2 );
+void IS31FL3731_update_pwm_buffers( uint8_t addr, uint8_t index );
+void IS31FL3731_update_led_control_registers( uint8_t addr, uint8_t index );
#define C1_1 0x24
#define C1_2 0x25