401 TT10_Luke_Clock
401 : TT10_Luke_Clock
- Author: Luca Pezzarossa
- Description: A VGA based binary clock
- GitHub repository
- Open in 3D viewer
- Clock: 25175000 Hz
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 fromui_in(2)11: Use external 1 Hz clock fromui_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 syncuo_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) tClkuio_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) inDisplayAreauio_out(6): (Debug output) modeReg [bit 0]uio_out(7): (Debug output) modeReg [bit 1]
How to test
- Connect VGA: Connect the TT VGA PMOD to the board and to the VGA monitor.
- Connect buttons and switches: Ensure all input buttons are wired correctly to control clock settings and layout changes.
- 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.
- 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.
- Observe VGA output: The binary clock should now display the current time, with automatic updates and color changes occurring daily.
- Test debugging outputs: If required, observe uio_out signals to verify internal timing and display area status.
- 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
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | select time clock source [bit 0] (switch) | red [bit 1] | (debug output) tClk |
| 1 | select time clock source [bit 1] (switch) | green [bit 1] | (debug output) cntReg [bit 0] |
| 2 | time clock 1Hz | blue [bit 1] | (debug output) cntReg [bit 1] |
| 3 | time clock 32768Hz | vsync | (debug output) cntReg [bit 2] |
| 4 | plus (button) | red [bit 0] | (debug output) cntReg [bit 3] |
| 5 | minus (button) | green [bit 0] | (debug output) inDisplayArea |
| 6 | select mode [bit 0] (switch) | blue [bit 0] | (debug output) modeReg [bit 0] |
| 7 | select mode [bit 1] (switch) | hsync | (debug output) modeReg [bit 1] |