Difference: RaspiElfDisplay (9 vs. 10)

Revision 102018-05-20 - PeterSchmid

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META TOPICPARENT	name="WebHome"

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< image="/twiki/pub/Cosmac/RaspiElf/raspi-elfmemcard-s.jpg"

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> image="/twiki/pub/Cosmac/RaspiElfDisplay/keypad-display-s.jpg"

title="!RaspiElf Display" titlestyle="color:#F00000;" }%

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Software for the Raspberry Pi

The Raspi controls the display through its I2C interface.

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< I still want to use the 1802 Membership Card's Front Panel Card. That means I have to use the D-SUB connector. But there is no address bus on this connector, therefore the address is only known as long as the DMA (load mode) is used. The data bus is neither available, you will see the data in the load mode (DMA) and the output port (LEDs) during the run mode.

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> I still want to use the 1802 Membership Card's Front Panel Card. That means I have to use the D-SUB connector. But there is no address bus on this connector, therefore the address is only known as long as the DMA (load mode, counting the DMA cycles) is used. The data bus is neither available, you will see the data in the load mode (DMA) and the output port (LEDs) during the run mode.

There is Python Library and Examples for Micro Dot pHAT on GitHub from Pimorini itself. But I prefer plain C and wrote my own hex display driver microdot_phat_hex.c

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How to get and build the RaspiElf Display Software

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< The elfdisplay is part of the tools package. See RaspiElf#How_to_get_and_build_the_RaspiEl

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> The elfdisplay is part of the RaspiElf tools package. See RaspiElf#How_to_get_and_build_the_RaspiEl

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- 2 Latch Inputs

This is a total of 18 GPIOs. Do not forget: the Raspberry Pi GPIOs are not 5 V compatible!

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< Is somebody out there interested in a TIL311 emulator? Linux is not a Real Time Operating System (RTOS), and it is easy to miss a strobe signal, even if we use interrupts.

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> Is anybody interested in a TIL311 emulator? The only problem to write a program for the Raspi is to be fast enough for the strobe signal. Linux is not a Real Time Operating System (RTOS), and it is easy to miss a strobe signal, even if we use interrupts.

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META FILEATTACHMENT	attachment="til311-e4-519224.pdf" attr="" comment="" date="1525462029" name="til311-e4-519224.pdf" path="til311-e4-519224.pdf" size="92644" user="PeterSchmid" version="1"
META FILEATTACHMENT	attachment="keypad-display.jpg" attr="" comment="" date="1526832742" name="keypad-display.jpg" path="keypad-display.jpg" size="735188" user="PeterSchmid" version="1"

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META FILEATTACHMENT	attachment="keypad-display-s.jpg" attr="" comment="" date="1526841983" name="keypad-display-s.jpg" path="keypad-display-s.jpg" size="57507" user="PeterSchmid" version="1"

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