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by clouded
Thu Apr 28, 2016 3:11 pm
Forum: Compute Module
Topic: USBBoot on OSX
Replies: 19
Views: 5227

Re: USBBoot on OSX

gsh wrote:The bug was fixed in 2837...

Gordon
Awesome! Thanks!
by clouded
Thu Apr 28, 2016 2:41 pm
Forum: Compute Module
Topic: USBBoot on OSX
Replies: 19
Views: 5227

Re: USBBoot on OSX

gsh wrote:Just 2835 and 2836

Gordon
Is it still present in 2837?
by clouded
Fri May 15, 2015 3:45 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: CAN controller
Replies: 814
Views: 343093

Re: CAN controller

Seen slcan - IMO the problem is that: a) you loose the serial port on the pi (but you could run that over USB) b) you are limited to low transfer speeds of the UART on the RPI (4MBit max if I remember - and that was not always stable) c) you are limited by the text protocol of slcan that essentiall...
by clouded
Fri May 15, 2015 12:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: CAN controller
Replies: 814
Views: 343093

Re: CAN controller

@skpang @msperl I'd like to suggest another approach - slcan-compatible firmware for LPC. So basically it would be: set high UART speed on Raspberry (it can handle 4mbps and even more), connect LPC over UART to Raspberry, set up slcan on /dev/ttyAMA0. Also, if someone would prefer SPI - it is quite ...
by clouded
Tue May 12, 2015 7:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: CAN controller
Replies: 814
Views: 343093

Re: CAN controller

If you look at other devices, then you can also look at SJA1000 with 64 byte FIFO, for which there exists a driver in the kernel - but it is a 5V device... For me the biggest problem with it is the parallel bus. SPI is just much more convenient. As said: a MCU can run with mcp2515 or with an intern...
by clouded
Tue May 12, 2015 6:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: CAN controller
Replies: 814
Views: 343093

Re: CAN controller

Cost is another thing - the chip is quite expensive! But it has an integrated transceiver, I'd say that compensates its higher price. I am actually thinking about a solution where a mcu would sit in front of the mcp251x (also possibly a MCU with a can controller interface) and cache the data (with ...
by clouded
Tue May 12, 2015 4:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: CAN controller
Replies: 814
Views: 343093

Re: CAN controller

500KHz and lots of CAN-messages getting sent back to back over the bus are still happening to trigger delays with the current framework - but even then you can not make 100% sure you receive every message - it is linux (not hard real-time) and the 2 receive buffers on the mcp251x are too few to mak...
by clouded
Mon Mar 30, 2015 10:58 am
Forum: Advanced users
Topic: CONFIG_PREEMPT_RT on Raspberry Pi
Replies: 88
Views: 49714

Re: CONFIG_PREEMPT_RT on Raspberry Pi

I was able to solve the issue that prevented booting with the non-FIQ USB driver. It required the following fix: https://github.com/Clouded/linux-rt-rpi2/commit/690158b7490ffc8fc49941792d299071a99b283a Now it is possible to boot with the non-FIQ USB driver by adding these options to the /boot/cmdlin...
by clouded
Tue Mar 24, 2015 3:13 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: B+ auxiliary SPI support
Replies: 5
Views: 3792

Re: B+ auxiliary SPI support

Great work, Joan!
I wonder why this SPI is not supported officially by the kernel module? A lot of people don't know about it, but would definitely benefit from it.
by clouded
Fri Feb 27, 2015 3:05 pm
Forum: Advanced users
Topic: CONFIG_PREEMPT_RT on Raspberry Pi
Replies: 88
Views: 49714

Re: CONFIG_PREEMPT_RT on Raspberry Pi

Hi everyone, I tried the new 3.18 rt kernels for Raspberry Pi A+\B+ as well as new Raspberry Pi 2. Kernel for Raspberry Pi A+\B+ seems to work okay. Kernel for Raspberry Pi 2 has a problem - it freezes without any message (even with debug information enabled) when some process is run on cpu0 with pr...
by clouded
Mon Feb 09, 2015 11:36 am
Forum: General discussion
Topic: RT_PREEMPT patches for rpi2 rpi-3.18.y-rebase kernel?
Replies: 4
Views: 1156

Re: RT_PREEMPT patches for rpi2 rpi-3.18.y-rebase kernel?

So I have made another stupid error and followed the zombie herd of consumers grasping for the latest rpi2 without proper research or thought in the vain hope that things will 'just work' But on receiving the pi this afternoon and downloading the kernel git I realise that RT_PREEMPT patches are not...
by clouded
Wed Jan 21, 2015 3:17 pm
Forum: Advanced users
Topic: CONFIG_PREEMPT_RT on Raspberry Pi
Replies: 88
Views: 49714

Re: CONFIG_PREEMPT_RT on Raspberry Pi

Hello realtimers, I build kernels with PREEMPT_RT from time to time and just built the fresh one a couple of days ago - 3.12.36-rt50+. Links to sources, kernel and SD image are provided below. Cyclictest results: #Min: 00011uS #Avg: 00023uS #Max: 00066uS Raspberry Pi linux kernel source patched with...
by clouded
Thu Nov 13, 2014 4:06 pm
Forum: HATs and other add-ons
Topic: eepflash problems
Replies: 0
Views: 778

eepflash problems

Hello guys, I'm working on a hat and have stumbled upon a problem with EEPROM. When I try to access the EEPROM here's what I get: sudo ./eepflash.sh -r -f=dump.bin -t=24c32 This will disable the camera so you will need to REBOOT after this process completes. This will attempt to write to i2c address...

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