The LP5867 Graphical User Interface (GUI) is a convenient tool for controlling and evaluating all functions of LP5867. This section provides guidance on using the GUI.

1. Before opening the LP5867GUI.exe file, check that the hardware is connected by plugging the USB cable into the USB port of the computer.
2. Modify the Num Bytes to Write/Read field to 1 and select the Read button to successfully connect the EVM board to the USB2ANY (see Figure 3-3). The Read Data field returns data 0x00 if there are no errors.
   Figure 3-3 LP5867EVM GUI First Debug Step

The GUI can configure the LED to light up when the GUI successfully reads the default value 0x00 of register <0x00>. The following GUI instructions light up the LED.

1. Select the second page tab, entitled Chip Initialize (see Figure 3-4).
2. Select the Chip Enable button.
3. Configure the Dev_initial menu as follows:
   1. Select the Mode 1 option in the Data Refresh mode Selection drop-down menu.
   2. Select the 7 Scan lines option in the Maximum Scan Line Number drop-down menu.
   Figure 3-4 LP5867EVM GUI Chip Initialize
4. Select the forth page tab PWM Control (see Figure 3-5).
5. Select the ALL CS option in the CS Index DotPWM drop-down menu.
6. Select the ALL L option in the L index DotPWM drop-down menu.
7. Write 0x00FF in the Dot PWM Set Value field box.
8. Finally, select the Update PWM Duty Cycle button. The LED now lights up after completing these steps.