Raspberry Pi Forums

fsr

OrangeJello wrote:Is this a HW limitation or OS limitation (or both)?

neither, its a decision of the raspbian maintainers not to develop a real time kernel thats all.
--> preempt_rt

https://www.google.com.au/search?q=rasp ... 32&bih=941

fsr

What am I missing between these two options? well first of the PI is 3.3v so you need to create something to be able to drive the 5v relay board. But the real issue is safety. 1) Isolation: With a wireless setup your pi is safely isolated from the mains power, with a relay board you will have a box...

fsr

what is in the local firewall (if anything),

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sudo iptables -L

fsr

I wouldn't use Raspbian, security is too sloppy for direct exposure to the internet (raspbian is all about being easy to use). Use Arch or something else that has been built like a normal linux distro Considering I don't care much about security well if you are putting things on the internet you sho...

fsr

Oddly, I saw raspbian as a flavour of debian. what like raspberry flavoured or something? :) its derived from Debian like about 1000 other distributions but that doesn't mean is binary compatible. connecting to foreign sources is asking for trouble. you don't know which packages are incompatible. I...

fsr

That IS fixed. If you run python3 RPi.GPIO or python3 GPIOzero or C/C++ WiringPi (with the right enviroment variable) then none of those things need sudo. Partially fixed https://pypi.python.org/pypi/RPi.GPIO "Note that the current release does not support SPI, I2C, hardware PWM or serial functiona...

fsr

The amount of people who open up their Pi to the outside world is very small Can you put a figure on that or are you just going with a gut feeling there? My gut feeling is there are heaps, and half of them are unintentionally exposed. ;) there were 5,000,000 PIs in 2015, now there are 10,000,000. h...

fsr

raspbian is a different distribution to debian.

fsr

They have finally taken a step to fix that, and it's a step in the right direction. Sorry, don't agree with you here. Agree raspbian has a major security problem but disabling ssh does not improve security at all. It is just sweeping the problem under the carpet. The underlying issues are still the...

fsr

current jessie raspian is missing dnsutils. pi@raspberrypi:/ $ date Tue 20 Dec 12:52:46 UTC 2016 pi@raspberrypi:/ $ uname -a Linux raspberrypi 4.4.34-v7+ #930 SMP Wed Nov 23 15:20:41 GMT 2016 armv7l GNU/Linux pi@raspberrypi:/ $ nslookup -bash: nslookup: command not found pi@raspberrypi:/ $ dig -bash...

fsr

A bit more info, The issue arises when two things are configured * the console is on uart1 (/dev/ttyS0) * SPI1 is enabled. I've found another workaround too: 1) if you don't want bluetooth add 'dtoverlay=pi3-disable-bt' directive to the /boot/config.txt (as per above. disables bluetooth, configures ...

fsr

Unfortunately it won't boot with that line. Do you know of any gotyas? Hi Joan, looks like there is a conflict between the Aux Uart (UART1) and Aux SPI (SPI1) on the PI3 B. Still looking into it but disabling the Bluetooth (and therefore reverting the Uart config back to PI1/2) seems to work around...

fsr

Disabling the BT solved the problem. I just used: dtoverlay=pi3-disable-bt sudo systemctl disable hciuart Thats good news. the BT and the SPI1 share something on the SOC I suspect its a side affect of the BT. The BT module is connected to UART0 so the console is now UART1 (Aux UART) which shares re...

fsr

When I enable this line the Raspberry Pi 3 stops and starts very slowly (unusable). Hi gchirico, I don't have a PI3 so I can't test this myself but if you have the time perhaps we can work though it. SPI1 (and 2) are part of the 3 auxillary devices on the SoC, and enabling it in linux added two new...

fsr

Can you give me the steps to set it up? Would be mutch appreciated scince Im a bit new to Rasperry coding. 1) set your pi to use digital audio (leaves the PWM free for you to use) sudo raspi-config 2) in your config.txt enable the PWM kernel driver by adding this: dtoverlay=pwm-2chan,pin=12,func=4,...

fsr

6by9 wrote:but means you won't have audio output.

you mean analogue audio.
Digital audio (via hdmi) is independent of the PWM.

fsr

You need to be aware of inrush current and design everything to handle it. When an electrical motor starts there in an initial 'inrush' current which is much higher than the rated running current. https://en.wikipedia.org/wiki/Inrush_current There may be better ways to modulate the pump (e.g. someth...

fsr

You will have to use additional hardware.
The PI has two serial interfaces, but only one set of header pins are exposed, so you can only use one at a time.
Additional hardware can solve other problems for you anyway so its not as bad as it sounds - i.e. 5v ttl / RS232 compliance.

fsr

The newer kernel tree does support more devices (e.g. USB devices like wifi and dvb) Just wanted to mention that the 4.4 kernel also supports the broadcom auxiliary SPI hardware too. SPI1 is available to 40pin header rPis on GPIO 16-21 and SPI2 is available to the compute module on GPIO 40-45. Also...

fsr

joan wrote:I don't think the auxiliary SPI is currently supported. If not, have you any feel for when it might be supported by the Pi Linux driver?

It was accepted into the next raspbian kernel (4.4.x)
https://github.com/raspberrypi/linux/co ... b239b1fd1f

fsr

I want to be able to remap the hardware UART TX and RX the current uart1 overlay allows for the remapping of the pins https://github.com/raspberrypi/linux/blob/rpi-4.1.y/arch/arm/boot/dts/overlays/README https://github.com/raspberrypi/linux/blob/rpi-4.1.y/arch/arm/boot/dts/overlays/uart1-overlay.dt...

fsr

Greg Erskine wrote:
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Revision        : a22082

Thank-you

fsr

when someone gets hold of one could you post the revision?

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grep Revision /proc/cpuinfo

thanks!

fsr

what does netstat show on the pi, i.e. netstat -a | grep ssh secondly the pi should be able to ssh to itself across both it's network interface and loopback address $ ifconfig | grep 'inet addr' inet addr:10.57.3.25 Bcast:10.57.255.255 Mask:255.255.0.0 inet addr:127.0.0.1 Mask:255.0.0.0 $ ssh 10.57....

fsr

Gotcha007 wrote:everything that come from wlan0 must go to tun0

ok and this is 'normal' VPN behaviour. (as the whole point of establishing a VPN tunnel is to send all your traffic through it)
See if you can configure 'split tunnelling' - that allows for some traffic to go onto the LAN

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