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by not-scott
Sun Jul 19, 2020 1:50 pm
Forum: Camera board
Topic: Low-latency network stream
Replies: 3
Views: 275

Re: Low-latency network stream

Thanks for the tip pootle - unfortunately, VLC seems unable to cope with anything other than 1080p. The steam freezes within a second of connecting, and I keep getting "avcodec error: more than 5 seconds of late video -> dropping frame (computer too slow ?)" even after disabling hardware acceleratio...
by not-scott
Sun Jul 12, 2020 10:04 am
Forum: Camera board
Topic: Low-latency network stream
Replies: 3
Views: 275

Low-latency network stream

Hi all, I'm trying to stream the Raspberry Pi Camera Module over the network as part of a live stream. I've been working on this on-and-off for the last 18 months, but I've not been able to find any solution that matches the following constraints: Latency of under 500ms (any more and it doesn't feel...
by not-scott
Sun Feb 10, 2013 5:15 pm
Forum: Camera board
Topic: STICKY: Foundation (old) Camera Board information
Replies: 446
Views: 331644

Re: Foundation Camera Board information

Looks great. I'm looking at putting a Model A and camera module together for a portable webcam (with or without a USB microphone), any ideas on what current the camera draws? I expect it would fluctuate with the various settings, but are there maximum and minimum values?
by not-scott
Tue Oct 09, 2012 10:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

Re: I2C 16-bit memory addressing?

Thanks @Rious. I wrote a python class to deal with it that is fairly similar to what you have posted, but I did figure there wasn't much point in posting it (I can post it but I'm on a tablet right now and don't have the file). Also, I would like to thank you for standing up for me in regards to the...
by not-scott
Sun Sep 23, 2012 1:12 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

Re: I2C 16-bit memory addressing?

By just writing the 16 bit address as either two bytes or using 'w' mode to send a 16 bit value. NO other data bytes. Then do an i2cget of one or more bytes. With man pages for i2cdump, i2cget and i2cset I fail to understand your problem. Especially as you have read the datasheet and man pages The ...
by not-scott
Sat Sep 22, 2012 9:10 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

Re: I2C 16-bit memory addressing?

I have actually read the manual pages on i2cset and i2cget, and I have googled for this exact topic (16-bit memory addressing), and run help(__import__('smbus').SMBus) several times. I know I can set the data byte by sending a two data bytes and a byte address (the first data byte being the second o...
by not-scott
Sat Sep 22, 2012 2:30 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

Re: I2C 16-bit memory addressing?

First of all down load the data sheet:- http://ww1.microchip.com/downloads/en/devicedoc/21754g.pdf Then look at Figure 8-2 for the read sequence. You will see you need to write the address followed by the two bytes of the data. Then do a read and you will get the results of the byte. Umm... I've re...
by not-scott
Thu Sep 20, 2012 1:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

Re: I2C 16-bit memory addressing?

Exactly the same as writing, send it a two byte address and then read the byte at that address. Sorry, I have no idea on how to do that. I am trying to interface using Python, SMBus isn't helping, and i2ctools isn't much better. I know a little C++ and/or am willing to try Quickwire's I2C solution ...
by not-scott
Tue Sep 18, 2012 2:04 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

Re: I2C 16-bit memory addressing?

You need to split the internal memory address into two bytes, so you need to send two bytes with i2cset after sending the device address, whatever the option is for multiple byte transfer. See documentation for i2cset. But what about retrieving data from the EEPROM? This is actually the main compon...
by not-scott
Mon Sep 17, 2012 8:33 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C 16-bit memory addressing?
Replies: 19
Views: 27026

I2C 16-bit memory addressing?

Hi everyone, I'm trying to interface with a 24FC512 EEPROM. It uses a 16-bit memory address. I have a Picaxe which can interface fine, and i2cdetect can see it (0x50), ruling out the chip as the cause of the issue. However, any read or write operation I attempt from the Pi fails. In addition to this...

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