Difference: RaspiElf (25 vs. 26)

Revision 262018-01-02 - PeterSchmid

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META TOPICPARENT	name="WebHome"

%DASHBOARD{ section="banner"

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For other than US keyboards you can use Ctrl-4 instead of Ctrl-

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For other than US keyboards you can use Ctrl-4 instead of Ctrl-\.

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Remote access the Elf Membership Card with a GNU/Linux PC and SSH (or a Windows PC and PUTTY):

psi@homer:~> ssh -l pi -X 192.168.1.111
pi@192.168.1.111's password: 

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Tue Jan  2 15:53:08 2018 from homer.home
pi@cosmac:~ $ cd elf/basic/
pi@cosmac:~/elf/basic $ bin2elf -w -r LBR_8000.bin
0x0003 bytes written
pi@cosmac:~/elf/basic $ microcom -s 9600
connected to /dev/ttyS0
Escape character: Ctrl-\
Type the escape character followed by c to get to the menu or q to quit

Membership Card's Serial Monitor Program Ver. 2.0
Enter "H" for Help.
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If your ISP supports DMZ, static IP addresses, port forwarding and dynamic DNS you have remote access to your Elf from everywhere.

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The Raspberry Pi ARM processor supply voltage is 3.3 V and the GPIOs are not 5 V tolerant. The Elf supply voltage is 5 V. This means that the GPIOs (input) has to be protected from Elf. The easiest way is to use diodes e.g. 1N4148 to protect the GPIOs from the 5 V, but the GPIOS need then a pullup resistors. Thankfully the Raspi GPIOs have internal pullup and can be controlled by software. The cathode has to be on the Elf side.

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The Raspberry Pi ARM processor supply voltage is 3.3 V and the GPIOs are not 5 V tolerant. The Elf supply voltage is 5 V. This means that the GPIOs (input) has to be protected from Elf. The easiest way is to use diodes e.g. 1N4148 to protect the GPIOs from the 5 V, but the GPIOs need then pullup resistors. Thankfully the Raspi GPIOs have internal pullups and they can be controlled by software. The cathode has to be on the Elf side.

It is possible that the Elf works with 3.3 V supply voltage, but this is not within the specifications. In this case the diodes are not needed. Connect the Raspi Pin 1 to P4 Pin 3 (do NOT connect Raspi Pin 2!).

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