Problem Description A seven-segment LED core displays patterns on the 8-digit 7-segment LED display of the Nexys board. The core and its driver are discussed in Chapter 14 of the textbook. We want to enhance the core to set the brightness of the LED display to 16 different levels. The design procedure is 1 The Vivado project file (sampler.xpr.zip) of the"Sampler.FPro system of Pan 2. Expand the 7-segment multiplexing circuit (led mux8) of Listing 14.7 to include an 3. Revise the core (chu_ sseg8) of Listing 14.8 to include the new feature can be found in http:/lacademic.csuohio.sdu/chupipgams yhdl.html. Download and decompress the file. All VHDL files can be found in the srcs folder additional 4-bit input signal, bright, to control the brightness of the LEDs. The "1111 sets the brightest condition and "O000" turns of the LEDs. This can be achieved with an additional PWM-like circuit. 4. Add a new method to SsegCore driver of Listings 14.9 and 14.10 set brightness (int bright), where bright is between 0 and 15 Derive a test C++ program. display with a format of "mm.ss.d", where mm is minutes, ss is seconds (between 0 and 59), and d is 0.1 second. 5. The program displays the "system uptime" on the 7-segment What to turn in Project demo at 2:00 Nov 27 (Monday). VHDL core of the enhanced LED multiplexing circuit in Step 2 (10 points). VHDL core of the revised core in Step 3 (6 points). C++ code of the new method in Step 4 (6 points). C++ code of the main program in Step 5 (8 points)