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by guillaumekh
Mon Feb 03, 2020 10:00 pm
Forum: HATs and other add-ons
Topic: PCF8523 RTC: Reading the battery low bit
Replies: 1
Views: 524

Re: PCF8523 RTC: Reading the battery low bit

Got it ! I wrote this C program to print the bit. It's my first C program. W00t ! #include "stdio.h" #include "stdlib.h" #include "unistd.h" #include "sys/ioctl.h" #include <linux/rtc.h> #include "fcntl.h" #include "string.h" #include "errno.h" #define ERROR -1 int main(int argc, char **argv) { char...
by guillaumekh
Wed Jan 29, 2020 5:52 pm
Forum: HATs and other add-ons
Topic: PCF8523 RTC: Reading the battery low bit
Replies: 1
Views: 524

PCF8523 RTC: Reading the battery low bit

I might be reading this incorrectly but judging from the PCF8523 RTC driver , there is a battery low bit which can be read. #define REG_CONTROL3 0x02 #define REG_CONTROL3_PM_BLD (1 << 7) /* battery low detection disabled */ #define REG_CONTROL3_PM_VDD (1 << 6) /* switch-over disabled */ #define REG_...
by guillaumekh
Fri May 17, 2019 4:33 pm
Forum: Compute Module
Topic: CM3+ availability
Replies: 8
Views: 1240

Re: CM3+ availability

6by9 wrote: https://www.raspberrypi.org/forums/view ... 9#p1462310
(Mike does all the coordination with RS and Farnell).
Ah, sorry i missed that post. Thanks!
by guillaumekh
Fri May 17, 2019 3:57 pm
Forum: Compute Module
Topic: CM3+ availability
Replies: 8
Views: 1240

Re: CM3+ availability

Maybe placing an Order would give an idea of quantities required to either RS or Element14, unless you just need the odd 1 or 2 ? Isn't it easier to just call them ? :) I've directly reached out to Farnell Europe and they've reported that, for the 32GB CM3+ which I inquired about : - they are curre...
by guillaumekh
Fri May 17, 2019 3:13 pm
Forum: Compute Module
Topic: CM3+ availability
Replies: 8
Views: 1240

Re: CM3+ availability

pun intended ? and it does seem a long time - 3mnth is usually backlog for chip production.... so maybe there has been a massive order somewhere down the line ah, did not notice :lol: A Farnell/Element14 representative told me over that the current 14/10/19 backorder delay on their EMEA website is ...
by guillaumekh
Fri May 17, 2019 3:01 pm
Forum: Compute Module
Topic: CM3+ availability
Replies: 8
Views: 1240

Re: CM3+ availability

RaTTuS wrote: I don't think the foundation has any control over it
That's correct if i understand the foundation's governance correctly.

However, I'm hoping someone from Raspberry Pi Trading Limited — which handles manufacturing if I'm not mistaken — can chip in.
by guillaumekh
Fri May 17, 2019 2:51 pm
Forum: Compute Module
Topic: CM3+ availability
Replies: 8
Views: 1240

CM3+ availability

Hi, Raspberry Pi Trading's Approved Resellers in Europe RS & Farnell/Element14 are currently out-of-stock of most CM3+ references (CM3+/Lite, CM3+/8GB, CM3+/16GB, CM3+/32GB). This doesn't paint a complete picture since these huge companies have stocks in multiple locations around the world, but it s...
by guillaumekh
Fri Mar 29, 2019 7:44 pm
Forum: Advanced users
Topic: Voltage reduction under thermal throttling
Replies: 7
Views: 731

Re: Voltage reduction under thermal throttling

Nice thanks @jahboater
by guillaumekh
Fri Mar 29, 2019 5:33 pm
Forum: Advanced users
Topic: Voltage reduction under thermal throttling
Replies: 7
Views: 731

Voltage reduction under thermal throttling

The Frequency management and thermal control chapter in documentation mentions the following (emphasis mine) : As the device approaches the limit, various frequencies and sometimes voltages used on the chip (ARM, GPU) are reduced . For Raspberry Pi 3 Model B+, [...] when the soft limit is reached, t...
by guillaumekh
Thu Mar 28, 2019 3:51 pm
Forum: Advanced users
Topic: Sourcing & testing alternative power supplies
Replies: 5
Views: 1909

Re: Sourcing & testing alternative power supplies

Sorry for necroposting After learning a few more things about electronical design, we found out that our PSU was blameless. :oops: What happened to us was some components (i.e. a Bourns MF-MSMF250 polyfuse, and some thin aluminium wires) between the Pi & DC jack were introducing a voltage drop. If i...
by guillaumekh
Fri Dec 21, 2018 8:21 pm
Forum: Advanced users
Topic: Sourcing & testing alternative power supplies
Replies: 5
Views: 1909

Re: Sourcing & testing alternative power supplies

Hello James, We use a DC barrel jack because it's lock-able, preventing accidental disconnection (example below). It also has the benefit of looking more "pro", which is admittedly more a marketing benefit than an engineering one. https://uk.farnell.com/productimages/standard/en_GB/1871174-40.jpg We...
by guillaumekh
Fri Dec 21, 2018 7:40 pm
Forum: Advanced users
Topic: Sourcing & testing alternative power supplies
Replies: 5
Views: 1909

Sourcing & testing alternative power supplies

We love the official Raspberry Pi power supply , manufactured by Stontronics. It's reliable, modular, and bears loads of certifications for export. You can't ask much more from a PSU. https://media.rs-online.com/t_large/F9098135-01.jpg ...which is why we're super bummed we can't use for it for a cur...

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