Raspberry Pi Forums

dpawson

thanks, yes.

https://linuxhint.com/raspberry_pi_temperature_monitor/ pretties this up a bit.

dpawson

A fully wired rpi 4 doesn't hang (other than from all the wires).
With Raspberry pi kbd as well, there's little room to hang it anywhere.

I settled on a fan and it's working.

Is there a command line (bash) tool I can use to monitor the temp please?

dpawson

Yep, that worked.

https://flic.kr/s/aHsmG4HTF1

Once I'd got my head around the 180 shift

Much neater.

dpawson

Looking at your picture if you turned both plugs round the cable would come out on the outside, you could then dismantle one of the plugs and shorten the cable so as to reduce the spare cable left hanging out side the pi. the cable would then follow the path shown by the yellow line https://i.imgur...

dpawson

Hearing of the heat issues I added a fan. 5V using usb. Which necessitated stand offs, and ribbon cable. Which meant a mounting system (styrene, 2mm). Result is not pretty. It runs cool and works. Ribbon is M-F, oddly the connectors don't fit in between the stand offs - pcb holes too tight (Eben?). ...

dpawson

I have a sense hat mounted to an A+. I put a proto hat mounted on a stacking header between the Pi and sense hat and my temps then read normal. Close enough to normal ambient for me anyway. That pi sits upright with the GPIO header on the bottom to let the hot air escape easily. No case. I had some...

dpawson

I bought the RPI, liked the look of the sense hat and bought it, before finding about the heat issue. Last few days spent finding a way of cooling, with a hat 'mounted'. Parts on order. 1. Various stand off's, 2.5mm 2. NF-A4x10 5v 1" fan, driven from ob usb. 3. M-F 40w ribbon (rt angle fold to align...

dpawson

https://www.dominicsayers.com/sense-hat/ Seems quite logical, unless you want the sense hat on top of the rpi - not good for an rpi 4. Purchased. Mounted RPI 4, fan (usb powered), sense hat. Ribbon 'stretches' the standoff posts, misaligns hat! https://drive.google.com/file/d/1A6KNR_sahRRIGlrrwUmJT...

dpawson

The conflict info came from Pimoroni, so I guess I must accept it.

dpawson

There other cases on Aliexpress which show the fan wires connected between 5V and 3.3V GPIO pins too. I don't think that's a good idea. I guess whoever produced the images just plugged them in at random. Not nice - Is GPIO the only place we can tap 5v on the board? Imples @rpi only ever expected on...

dpawson

Is there a fan powered by a.n.other means than GPIO? One of the many aluminium cases on Aliexpress shows fan wires connected to the POE header pins. Presumably two of these pins are connected to 5V and Ground. No idea which, or if you can really power a fan from them though. https://www.aliexpress....

dpawson

Fanshim looks pretty neat. Are the GPIO pins still usable 'above' the n pins used by the fan please? A bit cockeyed, but still usable? It depends on what you mean by "usable". They're certainly accessible - the shim is very thin and is not soldered. You could connect to the pins with a 40-way ribbo...

dpawson

Fanshim looks pretty neat. Are the GPIO pins still usable 'above' the n pins used by the fan please?
A bit cockeyed, but still usable?

Is there a fan powered by a.n.other means than GPIO?

dpawson

Fan SHIM our favourite pirates are selling makes temperature under control at all times. After installing it I haven't seen it going over 49ºC at any point. And - it is solderless installation - so no need to 'dedicate' PI to run with that particular shim. Alternative (from my perspective) is what ...

dpawson

Tail recursion, in assembler?
E.g. given...

Code: Select all

def mymod(n):
    if (n < 10):
               return n
    return mymod(n - 10)

What might the asm look like?

Any pecularities or is is straightforward?
Not something I'd thought of before.
TIA

dpawson

Thanks rurwin.

input:
space 96,0

ldr r1,=input
mov r2, #96
mov r0, 0
mov r7, #3
svc #0

ldr r1, =input
mov r2, r0
bl print @ subr to print

Works nicely.

Dave

dpawson

Taking this a little further. http://asm.sourceforge.net/syscall.html shows the kernel etc calls, which relate cleanly to the definitions at http://lxr.free-electrons.com/source/arch/arm/include/asm/unistd.h?v=3.1;a=arm E.g 3. sys_read Syntax: ssize_t sys_read(unsigned int fd, char * buf, size_t cou...

dpawson

GIYF

Report bugs at

http://sourceware.org/bugzilla/

Sorry to waste bw.

DaveP

dpawson

Just running gas and an error came up

Internal error:
Assertion failure in make_mapping_symbol at ../../gas/config/tc-arm.c line 2485
Please report this bug
the line in question is
.bss right at the end of the program

.... Then no uri where I can report it?

Any suggestions pls?

dpawson

rurwin wrote:http://www.raspberrypi.org/phpBB3/viewt ... =26&t=6857

Summary: Don't do an RPiUpdate at the moment; it seems to be broken.

Worked an hour ago?

Dave

dpawson

texy wrote:
Last night the ca-certificate failed to download (or be found, one or t'other). Is this resolved now?

Texy

No problem today.

Dave

dpawson

OK, thanks Nick

dpawson

Having run it I get
Using SoftFP libraries
/opt/vc/sbin/vcfiled: error while loading shared libraries: libvchiq_arm.so: cannot open shared object file: No such file or directory?

Suggestions please?

dpawson

NickT wrote:
dpawson wrote:Someone tell what rpi-update is please?

Dave
It's way of keeping your Pi up to date with the very latest firmware/kernel patches. Best explained here

https://github.com/Hexxeh/rpi-update

Needs ca-certificates and git-core too!

Thanks.

dpawson

Someone tell what rpi-update is please?

Dave

Search found 129 matches

Re: Pi4 Cooling

Re: Pi4 Cooling

Re: rpi 4 + sense hat, mechanical assembly

Re: rpi 4 + sense hat, mechanical assembly

rpi 4 + sense hat, mechanical assembly

Re: RPI 4 with sense hat

RPI 4 with sense hat

Re: Best Ribbon Cable for Sense Hat?

Re: Pi4 Cooling

Re: Pi4 Cooling

Re: Pi4 Cooling

Re: Pi4 Cooling, fan not powered from GPIO?

Re: Pi4 Cooling, fan not powered from GPIO?

Re: Pi4 Cooling

recursion... in asm?

Re: asm printf?

Re: asm printf?

Re: Where to report bugs?

Where to report bugs?

Re: OK LED off most of the time following rpi-update

Re: OK LED off most of the time following rpi-update

Re: OK LED off most of the time following rpi-update

Re: OK LED off most of the time following rpi-update

Re: OK LED off most of the time following rpi-update

Re: OK LED off most of the time following rpi-update