NP-41 Emulator (may be)

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NP-41 Emulator (may be)

01-25-2018, 02:52 PM

Post: #368

Alejandro Paz(Germany) Offline

Member

Posts: 135
Joined: Mar 2016

RE: NP-41 Emulator (may be)

I wrote a Fullnut core in VHDL, it seems to be working. It needs around 3000 LUTs on a Cyclone IV (and like 4000 on the MAchXO2) with 128 56 bit registers. Now I'm writing a LCD driver. I think I figured out how the display is connected, here an extract from the source, comment area.

Code:

    -- LCD driver

    -- Target LCD is a 6 common 12 digit 14 segment LCD

    -- Each common is a group of 6 segments, each digit is divided in 3 groups actuated by consecutive commons

    --

    --                          common  0        common  1         common  2

    --     ---------                             ---------                  

    --    |\   |   /|          |\                 0  |   /                  |

    --    | \  |  / |        0 | \ 1                1|  / 2               1 |

    --    |  \ | /  |  o       |  \                  | /                    |  o 0

    --     ---- ----            ---- 2                ---- 3                

    --    |  / | \  |          |  /                  | \                    |

    --    | /  |  \ |        3 | / 4               5 |  \ 4               2 |

    --    |/   |   \|  o       |/   5                |   \                  |  o 3

    --     ---------   ,        ---------                                      , 4

    --                                                             5

    --    Ann0 Ann1 Ann2                                          Ann0           

    --

    -- The segments are biased with 47 k resistors to VCC and GND and the segments

    -- Waveform

    --

    -- Segment 0

    --      --                                  --

    --     |  |__ __ __ __ __ __ __ __ __ __   |  |__ 

    --     |                                |  |   

    --   --                                  --      

    --  +  0  +  1  +  2  +  3  +  4  +  5  +  0  +    

    -- Segment 1

    --            --                                  --

    --   __ __   |  |__ __ __ __ __ __ __ __ __ __   |  |__

    --        |  |                                |  |

    --         --                                  --                     

    --   +    +     +     +     +     +     +     +     +

    -- Common for "on"

    --   --

    --  |  | 

    --  |  |  

    --      -- -- -- -- -- -- -- -- -- -- -- -- -- -- --