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7-segment displays

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This part of the stdlib implements graphical user interfaces in the form of external blocks that can be connected to bopkit circuits.

Digital watch​

The interface displays a 7-segment display for a digital watch.

It is used in the digital-watch project.

Digital calendar​

This displays adds the date in addition to the time of day.

It is used in the visa project.

7_segment.bop​

Checkout the entire contents of the file 7_segment.bop

/**
 * To produce the bits code to send to the 7-segment display, we use a ROM that
 * contains them. Since there are 10 codes, we need 4 bits of address.
 */
ROM Dec7 (4, 7) = text {

  // Zero   One    Two     Three   Four
  1011111 0000110 0111011 0101111 1100110

  // Five   Six    Seven   Eight   Nine
  1101101 1111101 0000111 1111111 1101111

  // The remaining 6 words are set to [false] since they are
  // not specified here.
}

external digital_watch_display "digital_watch_display.exe"

external digital_calendar_display "digital_calendar_display.exe"

digital_watch_display(h10:[7], h1:[7], m10:[7], m1:[7], s10:[7], s1:[7]) = ()
where
  external("digital_watch_display.exe",
    h10:[7],
    h1:[7],
    m10:[7],
    m1:[7],
    s10:[7],
    s1:[7]);
end where;