401 TT10_Luke_Clock

401 : TT10_Luke_Clock

Design render

How it works

The TT10 Luke Clock project implements a VGA-based binary clock using Chisel. The clock displays hours, minutes, and seconds in a binary format using a matrix of squares, which updates every second. Each colums shows the binary value of a digit of the time in the format HH:MM:SS.

Facts

  • The clock supports multiple time-clock sources (internal and expternal) selectable via input settings and allows user interaction through input buttons (see description in the user input below).
  • The display colors change randomly every day (randomized with LFSR) or with input by the used. The display layout can also be changed by the user.
  • The VGA output generates a 640x480 image at 60 fps.
  • All user inputs (buttons and switches) are debounced interanlly.

Module inputs (ui_in)

  • ui_in(0): Select time clock source [bit 0]
  • ui_in(1): Select time clock source [bit 1]
    • 00: Use internal clock (if set at 25.175 MHz)
    • 01: Use internal clock (if set at 25 MHz)
    • 10: Use external 32.768 kHz clock from ui_in(2)
    • 11: Use external 1 Hz clock from ui_in(3)
  • ui_in(2): Time clock 1Hz
    • External 1 Hz time clock input
  • ui_in(3): Time clock 32768Hz
    • External 32.768 kHz time clock input
  • ui_in(4): Plus – Used to set the clock or change layout (deoending on select mode inputs)
  • ui_in(5): Minus (button) – Used to set the clock or change layout (deoending on select mode inputs)
  • ui_in(6): Select mode [bit 0]
  • ui_in(7): Select mode [bit 1]
    • 00: Adjust seconds (Plus: clear seconds, Minus: clear seconds)
    • 01: Adjust minutes (Plus: increase minutes, Minus: decrease minutes)
    • 10: Adjust hours plus: (Plus: increase hours, Minus: decrease hours)
    • 11: Switch layout/color (Plus: changes layout, Minus: changes colors)

Module outputs (uo_out)

The outputs are uused to connect the VGA monitor. They are compatible with with the TT VGA PMOD interface.

  • uo_out(0): Red [bit 1]
  • uo_out(1): Green [bit 1]
  • uo_out(2): Blue [bit 1]
  • uo_out(3): Vertical sync
  • uo_out(4): Red [bit 0]
  • uo_out(5): Green [bit 0]
  • uo_out(6): Blue [bit 0]
  • uo_out(7): Horizontal sync

Module bidirectionals (uio)

The following bidirectionals (all used as output) provide debugging information for internal signals.

  • uio_out(0): (Debug output) tClk
  • uio_out(1): (Debug output) cntReg [bit 0]
  • uio_out(2): (Debug output) cntReg [bit 1]
  • uio_out(3): (Debug output) cntReg [bit 2]
  • uio_out(4): (Debug output) cntReg [bit 3]
  • uio_out(5): (Debug output) inDisplayArea
  • uio_out(6): (Debug output) modeReg [bit 0]
  • uio_out(7): (Debug output) modeReg [bit 1]

How to test

  1. Connect VGA: Connect the TT VGA PMOD to the board and to the VGA monitor.
  2. Connect buttons and switches: Ensure all input buttons are wired correctly to control clock settings and layout changes.
  3. Select time source: Use the input settings to choose between the internal clock, an external 32.768 kHz clock, or an external 1 Hz clock.
  4. Set time and layout: Use the Plus and Minus buttons and the Select mode switches to adjust hours, minutes, and seconds, or switch between different display layouts and colors.
  5. Observe VGA output: The binary clock should now display the current time, with automatic updates and color changes occurring daily.
  6. Test debugging outputs: If required, observe uio_out signals to verify internal timing and display area status.
  7. Enjoy the clock: Watch the binary time representation update in real-time on the VGA display.

External hardware

  • TT VGA PMOD modules
  • Buttons and switches
  • (Optional) Real-Time Clock (RTC)
    • For precision timekeeping, an RTC generating 1 Hz or 32.768 kHz can be connected as an external time-clock input.

IO

#InputOutputBidirectional
0select time clock source [bit 0] (switch)red [bit 1](debug output) tClk
1select time clock source [bit 1] (switch)green [bit 1](debug output) cntReg [bit 0]
2time clock 1Hzblue [bit 1](debug output) cntReg [bit 1]
3time clock 32768Hzvsync(debug output) cntReg [bit 2]
4plus (button)red [bit 0](debug output) cntReg [bit 3]
5minus (button)green [bit 0](debug output) inDisplayArea
6select mode [bit 0] (switch)blue [bit 0](debug output) modeReg [bit 0]
7select mode [bit 1] (switch)hsync(debug output) modeReg [bit 1]

Chip location

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