(r1) RaspiElfDisplay < Cosmac

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Long time ago I built a LED display and a hex keypad for my [[Cosmicos][COSMICOS]]. I lend the COSMICOS and the extensions to a friend's brother and I saw the parts never again. Thanks to Lee Hart's [[http://www.sunrise-ev.com/membershipcard.htm][1802 Membership Card]] I have a 1802 SBC again. Now I need a display and a keypad for this gem.
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---+ Hardware
TIL311 hexadecimal displays were to expensive for me 35 years ago and now they are not easy to get (and still expensive). The 4×7 rounded font looks far better than the seven-segment display especially the lower case hex display letters. But there is an alternative: LTP-305 from LITEON. They have no integrated driver, but the !IS31FL3730 can drive two of them. And better there is PCB with 6 LTP-305 and 3 !IS31FL3730 from pimoroni ready for the Raspberry Pi. 4 digits for the address and 2 digits for data! 

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| %IMAGE{"%PUBURLPATH%/Cosmac/RaspiElfDisplay/LED_module.jpg" type="thumb" caption="LTP-305 Dot Matrix Display"}% \
| %IMAGE{"%PUBURLPATH%/Cosmac/RaspiElfDisplay/Microdot_pHAT.jpg" type="thumb" caption="Microdot_pHAT on Raspberry Pi Zero"}% |

https://shop.pimoroni.com/products/microdot-phat


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---+ Software for the Raspberry Pi

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---+ How to get and build the RaspiElf Display Software

Get the source from the [[https://github.com/spyren/RaspiElf][GIT repository]] (if you have not installed GIT yet, then install it with
=sudo apt-get install git=), type only the bold text after the $ sign:
<pre>
pi@cosmac:~/elf $ <b>git clone https://github.com/spyren/RaspiElf</b>
Cloning into 'RaspiElf'...
remote: Counting objects: 68, done.
remote: Compressing objects: 100% (37/37), done.
remote: Total 68 (delta 32), reused 62 (delta 29), pack-reused 0
Unpacking objects: 100% (68/68), done.
Checking connectivity... done.
pi@cosmac:~/elf $
</pre>

Build (compile) from the sources:
<pre>
pi@cosmac:~/elf $ <b>cd RaspiElf</b>
pi@cosmac:~/elf/RaspiElf $ <b>cd display/</b>
pi@cosmac:~/elf/RaspiElf/display $ <b>make</b>
... TBC
</pre>

Install the binaries into =/usr/local/bin=
<pre>
pi@cosmac:~/elf/RaspiElf/display $ <b>sudo make install</b>
... TBC
</pre>
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---+ TIL311 Emulator
The TIL311 has following inputs:
   * Data Inputs A, B, C, D
   * Latch Input
   * Blanking Input
   * (Right and Left Decimal)

For 6 digits we need 36 GPIOs. Without blanking 32 GPIOs, shared latch 25 GPIOs. The Raspberry Pi has 26 GPIOs (we can have a latch for the data and a latch for the address). 

The [[http://www.sparetimegizmos.com/Hardware/Elf2K.htm][Spare Time Gizmo's Elf 2000]] display:
   * Databus
      * 8 Data Inputs
      * no strobe
   * Adressbus
      * 8 Data Inputs
      * 2 Latch Inputs
Only 18 GPIOs needed. Do not forget: the Raspberry Pi GPIOs are not 5 V compatible.

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-- %USERSIG{PeterSchmid - 2017-11-26}%

---++!! Comments
Attachments
Topic attachments
I	Attachment	History	Action	Size	Date	Who
jpg	LED_module.jpg	r1	manage	79.2 K	2018-05-03 - 20:14	PeterSchmid
jpg	Microdot_pHAT.jpg	r1	manage	164.3 K	2018-05-03 - 20:17	PeterSchmid
jpg	til311.jpg	r1	manage	96.4 K	2018-05-03 - 20:14	PeterSchmid
Topic revision: r1 - 2018-05-03 - PeterSchmid