cerplum

Re:FPGA dev board that's cheap, simple and supported by OSS toolchain on Monday January 11, 2021 @11:56AM (#25731708)

One potential shortcut is if you install their CubeMX and take a look in it's data files there are XML files for each distinct peripheral. So there'll be something like RTC_v1.0.xml and RTC_v2.0.xml. Someone uploaded an old copy of them [1] if you just want a quick look.

Then there's also device & device family xml files that link to the various peripherals they have [2].

There's probably no guarantees but in my experience if two devices link to the same version xml file their peripheral registers at least will be identical. Quirks and silicon bugs, you are on your own of course... but then the ref manual doesn't help with that either!

[1] https://github.com/esden/stm32cube-database/tree/master/db/m...

[2] https://github.com/esden/stm32cube-database/tree/master/db/m...

Re:ESP32-C3 WiFi and BLE RISC-V processor is pin-to-pin compatible wit... on Sunday November 22, 2020 @06:32PM (#25182093)

https://www.tindie.com/products/kdcircuits/trigboard-ultra-l...

That one has extra circuitry to shut the esp down completely and wake it on either an external trigger or RTC based alarm. It claims 1.5uA sleep current.

The creator has a YouTube channel with lots of info about low power and other interesting tidbits https://www.youtube.com/user/kdarrah1234

Ask HN: Is it worth building a map overlay creation service (heatmaps etc)?

Posted by cerplum on Tuesday July 28, 2015 @09:08AM
from the ask-hn dept.

A while back I made an iOS app that displays crime data as a heatmap.There were relatively few tools for producing good quality overlays, especially with large datasets. Google maps overlays are great but limited to ~10,000 points which forces you to summarize and split the data.I made a few apps that pull the dataset from S3, create the heatmap overlays (100,000+ pngs), optimize them, zip into...

( Read More... | no comments | on HN )

Re:Ask HN: Is there ever a reason to use ActiveX? on Friday February 27, 2015 @07:29PM (#9122235)

In a previous job we had to make a plugin that could access win32 APIs for a bass ackwards set of companies who were determinedly sticking with IE6 or IE8. Their lockdown prevented the installation of proper desktop apps/services but allowed the installation of activeX (totally safe and secure, obviously). All the devs vehemently objected to ActiveX but couldn't actually come up with any viable alternatives other than turning down the business... If they had chrome or ff we could have probably gotten all we needed from the OS without directly using win32 (mostly desktop screenshot capture) or if they'd allowed us to ship them an msi to push to their machines we could have done a variety of other solutions... But alas, no.

So, I guess if your customers are in some insane semi-enterprise technology wasteland with impenetrable beurocracy and inscrutable "IT security" then yea, ActiveX might be a viable solution.

I quit after the plugin was repositioned to be our main offering above a semi-decent SAAS web service we offered. All aboard he ActiveX train! "The CEO can install ActiveX on his iPad right?"