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by zontar
Sun Apr 05, 2020 2:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: [SOLVED] basic testing of DPI interface
Replies: 11
Views: 1446

[SOLVED] basic testing of DPI interface

Hi, in my long quest (search the forum) to connect a low power display to the Raspberry I am moving from a 3 bit SPI display (which in the end worked) to something more colorful, i.e. an Ortustech Blanview 18 bit (3 x 6 bit) parallel display which I hope to drive via DPI. If you are interested, data...
by zontar
Tue Sep 10, 2019 11:56 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DSI roundup
Replies: 8
Views: 3182

Re: DSI roundup

Back on track after two years.. I've finally bought a couple of Ortustech Blanview displays (COM27H2P37ULC , https://www.distec.de/fileadmin/pdf/produkte/TFT-Displays/Ortustech/COM27H2P37ULC_Datasheet.pdf ). This should be a DPI display (should.. I'm not 100 % sure). To connect it to a Raspberry I'v...
by zontar
Tue Jul 24, 2018 3:23 pm
Forum: Graphics, sound and multimedia
Topic: using ultra low power 3 to 4 inch display on piZero
Replies: 0
Views: 356

using ultra low power 3 to 4 inch display on piZero

Hello, I have a wearable project in mind using a raspberryPiZero, a battery (2400mAh at the moment), the camera and a small ultra low power display, as well as a few components and a custom built PCB. Last year I've built a working prototype using a JDisplay MPI SPI display, that is RGB with 1-bit d...
by zontar
Wed Oct 11, 2017 12:10 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: FPC to DIP connector
Replies: 29
Views: 6846

Re: FPC to DIP connector

Hi, I use a LPM027M128B (with or without backlight from 4 leds, ) and also the LPM044M141A. I've written the driver myself, and I've written a 7bit font (only capital letters..) but unfortunately I couldn't manage to fit it right in a header file, so it's a header + c file. Basically it's a matrix 8...
by zontar
Tue Sep 19, 2017 10:58 am
Forum: Advanced users
Topic: RaspiZero breaks and restarts only after SD is read with Mac
Replies: 8
Views: 1378

Re: RaspiZero breaks and restarts only after SD is read with Mac

Well, yes the script has an amerpsand at the end.. but I wonder why a crash in my application crashes all the system.

Besides, I know it's maybe dirty to have the service in rc.local, I should put it in init.d or something more modern, but the issue still remains.
Thanks anyway
by zontar
Mon Sep 18, 2017 8:05 pm
Forum: Advanced users
Topic: RaspiZero breaks and restarts only after SD is read with Mac
Replies: 8
Views: 1378

Re: RaspiZero breaks and restarts only after SD is read with Mac

Ok.. I've browsed through my log files.. please notice that I launch my "server" via rc.local. Inside rc.local I call a shell script that does an endless "while" loop, calling my program, and then if the program exits, recalling it again.. in daemon.log I've found Sep 17 21:17:15...
by zontar
Mon Sep 18, 2017 7:22 pm
Forum: Advanced users
Topic: RaspiZero breaks and restarts only after SD is read with Mac
Replies: 8
Views: 1378

Re: RaspiZero breaks and restarts only after SD is read with Mac

OK.. sorry .. silly me.. NOOBS is like the boot loader? Or something like that. On top I've Raspbian, but.. the problem is my file system gets corrupted somehow and putting it in my Mac restores it. But nothing else (rebooting does not fix it..) Why? I'm thinking about mounting the SD in read only m...
by zontar
Mon Sep 18, 2017 6:57 pm
Forum: Advanced users
Topic: RaspiZero breaks and restarts only after SD is read with Mac
Replies: 8
Views: 1378

Re: RaspiZero breaks and restarts only after SD is read with Mac

Hi.. I have Raspbian, not Noobs, and regarding my expensive Apple machine :) the problem it's not that it cannot see partitions.. the problem is my Raspberry that crashes and cannot restart until something (my Mac?) sets something on the MBR (or whatever is on the SD nowadays).. I'll try looking in ...
by zontar
Mon Sep 18, 2017 12:30 pm
Forum: Advanced users
Topic: RaspiZero breaks and restarts only after SD is read with Mac
Replies: 8
Views: 1378

RaspiZero breaks and restarts only after SD is read with Mac

Hello, I've developed a simple program that runs endlessly on a piZero, reads from the camera and writes to a LCD panel via SPI. Everything works fine, but sometimes my program crashes (i think so, I'm not sure.. read more) and with it the RaspberryPiZero shuts down (or hangs, or whatever). From the...
by zontar
Mon Aug 28, 2017 9:44 pm
Forum: Camera board
Topic: Small Camera Connector "J2"
Replies: 6
Views: 2984

Re: Small Camera Connector "J2"

Hello, there are two ways that I am aware of: 1) buy a connector extension as this one https://shop.pimoroni.com/products/camera-cable-joiner-extender-for-raspberry-pi and some cables (they are simple flat cables..). http://www.ebay.it/itm/Hearty-CSI-Flat-Ribbon-Cable-for-the-Raspberry-Pi-Camera-fro...
by zontar
Mon Aug 28, 2017 8:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DSI roundup
Replies: 8
Views: 3182

Re: DSI roundup

Hi @ aBUGSworstnightmare, thanks for answering. But first of all, didn't you manage to have a DSI display connected to a Rasp with your breakout board (as per post linked?). Back to your post, you told me to look at another Ortustech module. As far as I can tell it's another Blanview as the one link...
by zontar
Mon Aug 28, 2017 10:19 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DSI roundup
Replies: 8
Views: 3182

DSI roundup

Hi, I'm a newbie when it comes to external displays. I'm working on a project where I need to connect a very low power, sunlight readable display to a Raspberry Pi Zero. So far I've managed to connect some SPI displays from J-Display and everything works more than fine (i've even tripled the specifi...
by zontar
Thu Aug 24, 2017 10:25 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: max SPI speed on PiZero
Replies: 3
Views: 5323

Re: max SPI speed on PiZero

Hi all. I've bypassed the constants in bcm3250 and set (as per piras77 suggestion) a divider of 50.. buff.. magic.. from 5fps I've gained 1.2 fps. Testing I can get to 6.6 FPS with a divider of 46. Not bad at the moment. Before optimizing I was down at 3.0 fps. One thing though: if I send static buf...
by zontar
Thu Aug 24, 2017 3:36 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: max SPI speed on PiZero
Replies: 3
Views: 5323

max SPI speed on PiZero

Hello, I currently have a SPI display attached via a custom-made board to my PiZero GPIO Header. Everything works as expected. I am able to play a video or image sequences on my display at 5FPS. Now I'd like to achieve 10 or 12 fps. I seem to have found that the maixmum SPI speed I have is around 5M...
by zontar
Mon May 29, 2017 2:32 pm
Forum: Graphics, sound and multimedia
Topic: Where to print and assemble PCB with SMD?
Replies: 5
Views: 1191

Re: Where to print and assemble PCB with SMD?

Thanks. Wrote to them, now waiting for an answer.

Anyone tried PCBTrain?

Thanks
+Z
by zontar
Mon May 29, 2017 9:20 am
Forum: Graphics, sound and multimedia
Topic: Where to print and assemble PCB with SMD?
Replies: 5
Views: 1191

Where to print and assemble PCB with SMD?

Hello, I've developed an early prototype of a board that works for a small multimedia project. Now I'd like to print a real board with some SMD components and connectors to test it on the go. Has anybody got any idea of a one-stop-shop in Europe that prints boards and assemble also SMD components? T...
by zontar
Wed May 10, 2017 12:08 pm
Forum: Networking and servers
Topic: Problems connecting two Raspberry via USB
Replies: 5
Views: 1632

Re: Problems connecting two Raspberry via USB

In the end it was a timing problem. so we wrote this script #!/bin/sh while true; do IP_ETH0=`ifconfig eth0 2>/dev/null|awk '/inet addr:/ {print $2}'|sed 's/addr://'` IP_USB0=`ifconfig usb0 2>/dev/null|awk '/inet addr:/ {print $2}'|sed 's/addr://'` if [ "$IP_ETH0" = "" ]; then su...
by zontar
Wed May 10, 2017 11:56 am
Forum: Networking and servers
Topic: Problems connecting two Raspberry via USB
Replies: 5
Views: 1632

Re: Problems connecting two Raspberry via USB

Ok, this last post was wrong: my fault. If I do

Code: Select all

sudo ifup eth0
the interface is brought up correctly. The problem remains as to why sometimes it is down.. we will put a watchodg to bring up the relevant interface if it is down.
by zontar
Wed May 10, 2017 11:46 am
Forum: Networking and servers
Topic: Problems connecting two Raspberry via USB
Replies: 5
Views: 1632

Re: Problems connecting two Raspberry via USB

By logging via a USB keyboard+HDMI on the master raspberry I noticed that, when I plug in the USB cable to te PiZero, the raspberry brings down the interface eth0. If I start it again sudo ifconfig eth0 up it goes up but without an IPv4. It has only an IPv6. Now, since sometimes it works, I know tha...
by zontar
Wed May 10, 2017 11:30 am
Forum: Networking and servers
Topic: Problems connecting two Raspberry via USB
Replies: 5
Views: 1632

Re: Problems connecting two Raspberry via USB

Yes.
As I wrote, sometimes it works. And sometimes it doesn't. Without touching any configuration file, just by chnaging physical connections or timing of startup.

Z
by zontar
Wed May 10, 2017 11:09 am
Forum: Networking and servers
Topic: Problems connecting two Raspberry via USB
Replies: 5
Views: 1632

Problems connecting two Raspberry via USB

Hi, we aim to achieve this setup: one raspberryPi3B acting as a "master" and a raspberryZero acting as a "slave", connected via USB cable. Moreover we need to work on these two machines, via SSH, so the master has an ethernet attached to my MacBookPro. First of all, let me say th...
by zontar
Sat May 06, 2017 6:25 pm
Forum: Other projects
Topic: Use RasperryPi Zero on a commercial project?
Replies: 2
Views: 749

Use RasperryPi Zero on a commercial project?

Hi everybody, I'm at the prototype stage of a project with a pizero, a camera and a small 3 bit display. At the moment everything kinda work, albeit with scotch tape, lot of cardboard, duct tape and some components dangling.. But before designing a custom PCB and case, I was wondering.. is it allowe...
by zontar
Sat May 06, 2017 7:36 am
Forum: Advanced users
Topic: connecting from Android to Raspberry Pi Zero via USB
Replies: 10
Views: 9229

Re: connecting from Android to Raspberry Pi Zero via USB

Yes the installations were the same (apart from the fact I suspect Jesse on Zero is the "lite" version).

We have indeed bought usb adapter explicitly marked as OTG.. gonna try as soon as they arrive.
Thanks
Z
by zontar
Fri May 05, 2017 12:14 pm
Forum: Advanced users
Topic: connecting from Android to Raspberry Pi Zero via USB
Replies: 10
Views: 9229

Re: connecting from Android to Raspberry Pi Zero via USB

Oh, and how is this accomplished? Since I also need to be able to SSH into it from an Android (or at least communcate via TCP/IP). I'm totally confused. This page https://gist.github.com/gbaman/975e2db164b3ca2b51ae11e45e8fd40a was suggested as the steps needed to put the Pi in slave mode. But these ...

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