Go to advanced search

by julyjim
Thu Apr 19, 2018 2:10 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading busy flag on LCD
Replies: 11
Views: 1914

Re: Reading busy flag on LCD

Just in case there is an interest. Still believe I should be able to use ioctl - per HD44780 setting the R/W to just read should make the HD44780 controller to "output" BF plus "address (?)". PCF8574 is pretty transparent to switch form write to read. So using ioctl "write " to set the R/W and then ...
by julyjim
Thu Apr 19, 2018 1:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Zero power spec?
Replies: 9
Views: 987

Re: Raspberry Zero power spec?

Thanks
Just out of curiosity - could you post the link where you got the info?
by julyjim
Thu Apr 19, 2018 12:30 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Zero power spec?
Replies: 9
Views: 987

Raspberry Zero power spec?

This post is a result of another discussion in this forum. After letting Mrs Google drive me nuts basically linking ALL my requests for Zero spec to same copy of BCM2835 datasheet. Fine. Nowhere does it say what is current capacity of plain GPIO port . For real - I want to connect multiple I2C expan...
by julyjim
Wed Apr 18, 2018 9:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB power Pi Zero W
Replies: 11
Views: 3285

Re: USB power Pi Zero W

Fried, this is becoming more and more pointless. Your arguments are academically valid , however, the Raspberry foundation apparently prefers few burned out Zeros than spending money on REAL spec. If somebody wants to make bootleg Zero - the technology is there, but same "argument" can be applied. W...
by julyjim
Wed Apr 18, 2018 5:24 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading busy flag on LCD
Replies: 11
Views: 1914

Re: Reading busy flag on LCD

Yes, sometime KISS works best. I finally got the "set up for 4 bits" working , but some steps seems to be candidates for usleep. I believe it is partially due to ioctl "write" so maybe I'll put the usleep there. It really does not follow the " write data when valid " - just assumes the data is set d...
by julyjim
Tue Apr 17, 2018 11:31 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading busy flag on LCD
Replies: 11
Views: 1914

Re: Reading busy flag on LCD

OK, I own you an answer. Indeed I am using "low level" approach to my development - for few reasons. First and most intriguing is that Linux has "low level" function "ioctl", secondly because as the OP said - there are oodles of "libraries" written for Arduino. Nice, but... These resources , I have ...
by julyjim
Tue Apr 17, 2018 8:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB power Pi Zero W
Replies: 11
Views: 3285

Re: USB power Pi Zero W

The Pi Zero has no voltage or current limiting circuitry so the power supply need s to be limiting controller Excellent point, but ... Since it has 3.3V output on GPIO , same as 3B ( as an example ) it has to have 3.3 V regulator and NO 5V regulator ? Assuming Zero is intended for mobile use (?) whe...
by julyjim
Tue Apr 17, 2018 8:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading busy flag on LCD
Replies: 11
Views: 1914

Re: Reading busy flag on LCD

I have no time to really digest your post. But it follows the original reply - does not answer the HOW question. Have been busy making my I2C work and just finished sending "The quick,,,," test message. To a casual observer likes me - I do not notice any speed issue getting the full text to the LCD....
by julyjim
Tue Apr 17, 2018 5:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB power Pi Zero W
Replies: 11
Views: 3285

Re: USB power Pi Zero W

"Limited by PSU, board, and connector ratings only." Per Zero "specification". How is that for "spec" ? The " connector ratings only" has little to do with how much power you can get FROM Zero USB port.. Perhaps Zero schematic would answer the question. The USB connectors power ratings are well spec...
by julyjim
Tue Apr 17, 2018 5:18 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Reading busy flag on LCD
Replies: 11
Views: 1914

Re: Reading busy flag on LCD

Geez, ask a straight and very valid question and get "don't do that" as reply. Really? It seems common approach to fudge delays by trial and error instead of following HD44780 datasheets. RTFM - if you do not check BF it takes LONGER to access the LCD for whatever purpose. Setting up to 4 bit mode s...
by julyjim
Fri Aug 11, 2017 3:49 pm
Forum: General discussion
Topic: TCF Agent
Replies: 0
Views: 404

TCF Agent

https://wiki.eclipse.org/TCF/Raspberry_Pi I am stepping thru this link and run into a dead end. I have annotated the following steps # (Replace n.n.n.n by the actual IP address that you read) ssh [email protected].n.n.n / password : raspberry sudo apt-get update # (Need to update the Raspbian update caches to ge...
by julyjim
Sat Aug 05, 2017 1:12 am
Forum: Troubleshooting
Topic: USB HDD crashing with Transmission
Replies: 6
Views: 923

Re: USB HDD crashing with Transmission

Use lsusb -v and verify "max current" on your HDD . Use it as a guide.
ON RPi 3 B each USB port spec is 100 mA .
Unless things changed over years HDD spin all the time, but do not start same time , and USB
packages are passed on time shared basis - there should not be power issue there.
by julyjim
Sat Aug 05, 2017 12:47 am
Forum: Troubleshooting
Topic: remote acess to Raspberry Pi
Replies: 1
Views: 383

remote acess to Raspberry Pi

I am making progress accessing RPi remotely via SSH.
While checking for ID using HOSTNAME -I I received two of them 10.0.1.26 and 10.0.1.27
Why two?
I can access the RPi using
ssh [email protected] or ssh [email protected]
by julyjim
Fri Aug 04, 2017 1:05 am
Forum: General discussion
Topic: What is the function of "SETTINGS" folder?
Replies: 3
Views: 597

Re: What is the function of "SETTINGS" folder?

OK, so why am I seeing it in Raspbian?

I usually do not monkey with stuff I do not know much about, but appreciate your motherly concern.
I am not sure the reply answered "what" , but thanks for the unnecessary warning anyway.
by julyjim
Thu Aug 03, 2017 5:57 pm
Forum: General discussion
Topic: Unable to use Eclipse to write C++ code
Replies: 2
Views: 500

Re: Unable to use Eclipse to write C++ code

Thank you for clarifying your answer.
by julyjim
Thu Aug 03, 2017 2:08 pm
Forum: General discussion
Topic: What is the function of "SETTINGS" folder?
Replies: 3
Views: 597

What is the function of "SETTINGS" folder?

What is the function of "SETTINGS" folder?
by julyjim
Thu Aug 03, 2017 2:04 pm
Forum: General discussion
Topic: Unable to use Eclipse to write C++ code
Replies: 2
Views: 500

Unable to use Eclipse to write C++ code

I like to use Add/Delete Software to add Eclipse CDT to be able to write C++ code. If I select Eclipse CDT it installs OK but there is are no options to build C++ project. If I select Eclipse platform it adds CDT and installs them OK but still I cannot build C++ project. In either case I can execute...
by julyjim
Fri Jul 28, 2017 6:47 pm
Forum: General discussion
Topic: HOW do I install and run Eclipse Oxygen for Linux 32 on Raspberry Pi?
Replies: 3
Views: 1866

Re: HOW do I install and run Eclipse Oxygen for Linux 32 on Raspberry Pi?

OK, if I want to run Eclipse on RPi - whose business it is?
Besides Eclipse 3.8 does not run any slower that the rest of the RPi apps.
Not to doubt your opinions either , but seeking the truth.
I shall pose the question in eclipse forum.
by julyjim
Fri Jul 28, 2017 4:51 pm
Forum: General discussion
Topic: Empty bootmode for SD card ?
Replies: 4
Views: 595

Re: Empty bootmode for SD card ?

OK, so it is a known docu mentation issue with nobody assigned to it. Can anybody enter such "problems " and WHERE? For example - I cannot change keyboard layout to US and make it permanent using GUI. Been told to use command ! Been plying with RPi for few weeks and found many annoying discrepancies...
by julyjim
Fri Jul 28, 2017 4:35 pm
Forum: General discussion
Topic: HOW do I install and run Eclipse Oxygen for Linux 32 on Raspberry Pi?
Replies: 3
Views: 1866

HOW do I install and run Eclipse Oxygen for Linux 32 on Raspberry Pi?

Apparently I have been posting my stuff on wrong forum. Problem / set up description I am unable to run an application "Eclipse" on Raspberry Pi which runs just fine on Unbutu 32 bit OS. My process follows these steps: On Ubuntu 32 bit OS I access vendor’s site and “download” Eclipse Oxygen package ...
by julyjim
Thu Jul 20, 2017 1:39 am
Forum: Beginners
Topic: How to do you install Eclipse?
Replies: 12
Views: 3486

Re: How to do you install Eclipse?

I have been trying to get similar issue solved. From this thread I get "Oxygen for Linux " does not mean one can install it in Rasbpian. What I am hearing is I need "Oxygen for Rasbpian", which is confusing to new Linux user. ( I was under the impression that repositories are where software apps com...
by julyjim
Thu Jul 20, 2017 1:06 am
Forum: General discussion
Topic: Powering exteranl 3.3V device
Replies: 5
Views: 2246

Re: Powering exteranl 3.3V device

I've read that the original A/B had about 50mA of elbow room left from the on-board 3v3 regulator. Newer Pi's may allow more, however if the 3v3 regulator draws too much, the 5V can be pulled too low, leading to the dreaded lightning symbol indicating low voltage. How much you can draw depends on: ...
by julyjim
Thu Jul 20, 2017 12:15 am
Forum: General discussion
Topic: Powering exteranl 3.3V device
Replies: 5
Views: 2246

Re: Powering exteranl 3.3V device

Moses, thanks for actually answering my question as asked.
Appreciate than very much.
Just out of curiosity the PAM2306 should be abler to handle BOTH DC-DC converters at 1 A each.
It looks as 1.8V is not available on P8 , but so far I do not need s 1.8 V externally anyway.
by julyjim
Wed Jul 19, 2017 1:30 pm
Forum: General discussion
Topic: Powering exteranl 3.3V device
Replies: 5
Views: 2246

Powering exteranl 3.3V device

Where can I find (reference please) how much load can Raspberry Pi 3B supply on external (GPIO connector ) 3.3 V bus.
I am using DDS AD9850 and will power it from 3.3 V .
The inputs are OK, in uA range, but output DAC can supply up to 30 mA.
Thanks

Go to advanced search