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#uart

2 posts2 participants0 posts today

Figured out my SA818 programming problem: I had the tx and rx lines backwards. I was under the impression that in UART, the tx pin on the first device was connected to the rx pin on the second. However, the cheap Chinese USB adapter I have wants tx to tx 🤦‍♂️

Good thing the description on the website is written in passable English, it had enough to get me on the right track.

#HamRadio#uart#vhf

Say I am debugging an #ethernet project on the #ice40 #fpga of pico-ice board. I want to know the contents of some registers down in my design (which destination MAC address my #hardware tried to transmit). I don't want to use manufacturer specific ILAs and don't want to hand route a bunch of debug signals to my top level for external #debug equipment I don't have.

In PipelineC just assign to a globally visible #UART debug probe wire:
github.com/JulianKemmerer/Pipe

Anyone know enough about the ATmega328 to know if the UART can cope with something else disabling interrupts for ~2mS...?

That sounds like quite a lot to me.

This is for handling MIDI, so I think at 31250 that would be enough for up to two complete 3-byte messages to have gone past...

Am about to pile into the datasheet, but the UART was always a bit of "mystery magic that just worked" for me...

Continued thread
Every time I do some project "for fun" (= not for work) I try to learn something new, in that way i can say the time needed is not wasted.
So, this time I decided to try #wirewrapping . This is a very simple circuit, with no board, so it's a very very simple case, but I tried and I liked it!

Here a photo while connecting the #esp8266 (already flashed with #zimodem and configured to connect to my wifi) with the #UART to #RS232 adapter.
I'm going to build a #wifi #serial #modem for my #amstrad PPC640. Something like #theoldnet 's wifi modem, but I'll use #zimodem on an #esp8266 , because it worked ok with my #commodore64 and now I have some experience with it...
The idea is having the esp emulate an #hayes modem on the #UART pins and convert it to rs232 using a #max3232 module.
I also will need to solder a 9 to 25 pin #rs232 adapter, because I absolutely don't remember where mine is (used last time a couple of home moves ago... 😅)

#dos #bbs #internet

Neuer Blogpost zu Nutzung von #Logic-Analyzern und der Software #PulseView, um einen Hardware-Bus wie #I2C, #SPI oder #UART zu belauschen. Wenn bei #IoT-Geräten mit Sensorik und Aktorik herausgefunden werden muss, ob der Fehler Software oder Hardware betrifft, entpuppen sich günstige #Logic-Analyzer mit dem #OpenSource Programm #PulseView als wahre Tausendsassa. Einstieg, die Protokollanalyse folgt in späterem Artikel oer-informatik.de/logicanalyze #elektronik #arduino #microcontroller

OER Informatik · Digitale Signale mit PulseView und einem Logic-Analyzer untersuchen – OER InformatikUm zu prüfen, ob ein Problem auf Hardware- oder auf Softwareseite besteht, ist es manchmal nötig, die Signale direkt zu messen. Logic-Analyzer bieten die Möglic