Recent Posts

1

FPGA / Re: Reverse engineering Anlogic AL3_10 FPGA

« Last post by pcprogrammer on Today at 05:33:37 pm »

Hi Atlan,

I looked at what you changed and the reduction of the clock divider widths should not make a difference in the working and only reduce the number of logic cells used.

The other change, where you invert the adc1_encA and adc2_encA signals should also not make a difference to what the original code did.

Keep in mind that in HDL actions are taken in parallel in this case. So with the code as it was the two encA registers are set to what the encB registers were before the clock pulse and the encB registers are inverted on the clock pulse. In simulation it works as intended.

With your setup it inverts all four of the signals instead of copying. Internally it most likely is just a difference in the routing.

I have not tested it on the scope as it will do just the same as what I tested 2 years ago.

Also be aware that the original design is as crap as can be. There can be clock domain crossing and meta stability issues with it. If your intent is to improve things, my advice is to start over and make your own design.

Some useful threads might be:
https://www.eevblog.com/forum/fpga/beginner-questions/msg4646935/#msg4646935
https://www.eevblog.com/forum/fpga/what-is-a-beter-write-enable/msg4074163/#msg4074163
https://www.eevblog.com/forum/fpga/why-does-this-dds-code-fail/msg4066636/#msg4066636

BrianHG is very good and helped me quite a bit.

Or take a look at the projects on fpga4fun:
https://www.fpga4fun.com/digitalscope.html

2

Test Equipment / Re: Hacking the Rigol DHO800/900 Scope

« Last post by ebourg on Today at 05:33:21 pm »

Another suggestion for the measurements: what about removing the channel indication "(C1)" and instead painting the label (Vmin, Vmax, etc) in the color of the channel? That would save a few pixels horizontally. Also the down arrow could be moved to the same line as the text, that would reduce the height of each measurement.

3

Microcontrollers / Re: ST's gdb server, probe-rs, JLink, BlackMagic differences between them?

« Last post by voltsandjolts on Today at 05:28:20 pm »

Breakpoints in FLASH are done by replacing code there with a jump instruction to some handler code.

I'm well aware of flash breakpoints, but you said "unlimited hardware breakpoints in FLASH", which is nonsensical. There are hardware breakpoints and there are flash breakpoints. You conflated two different mechanisms.

I looked at Ozone and was not impressed with the clunky thing

I find ozone to be very capable and prefer it to the ide debuggers I've tried.
Also provides a familiar debugger interface for use across different vendor mcus.

4

General Technical Chat / Re: Ahhhh!!! Terrifying! The UK just deployed the country alert system

« Last post by coppice on Today at 05:26:41 pm »

Windy.com Wind chart for Ireland around 9am if the link doesn't work.
I see 128km/h winds.

Dublin - no any syrens, no alert messages, just falling roofs 

I assume this was one of the gently sloped roof sections we see in the background. I've often looked at roofs like that, and wondered how much lift you could get from a strong wind in the right direction.

5

Test Equipment / Re: Hacking the Rigol DHO800/900 Scope

« Last post by ebourg on Today at 05:25:58 pm »

The panel with measurements is now without a background and all items in it are pressed down. This allows you to see the oscillogram better when only 3-4 measurements are active.

Very nice. Maybe you could push the measurements up by a few pixels to avoid overlapping the time scale.

6

Beginners / Re: Transceiver: injecting a tone

« Last post by Crambone on Today at 05:25:09 pm »

OK thanks everyone great info!

7

Test Equipment / Re: Has anyone ever megged a multimeter ? (HV testing)

« Last post by Aldo22 on Today at 05:23:24 pm »

And that is absolutely fine. But it’s irresponsible to tell everyone else here that they don’t need to observe CAT ratings either, and it’s absurd to basically insult people who try to take a more nuanced position.

I am not insulting anyone.
I just think that CAT ratings are irrelevant for most electronics hobbyists and that a budget meter can have other advantages and you shouldn't reject these devices simply because of their (dubious) CAT ratings.
And I also clearly stated that you should buy professional gear beyond CAT II.
Let's not get carried away.

8

Test Equipment / Re: New Zoyi multimeter+oscilloscopes - ZT-70xS, Generator

« Last post by Gibsonmb on Today at 05:21:18 pm »

Problem. In Output (F4 key of menu)  the up down arrows will not move me to the Freq, Vpp or duty fields and I cannot therefore set the amplitude level. The menu button when pressed, will allow me to set the signal type, sine square etc. it is the same for the 'more apps' generator and the "Output Setting". I can only get to the "Output field" but not the "Freq", "Vpp" or "Duty" fields in the Output Generator. The exit button (F4) will not allow me to exit either. In the "More apps" generator I can adjust Frequency, signal type and duty cycle but not amplitude as the buttons F1-F4 never offer amplitude to be adjusted. I am on V1.4.2 of firmware. How do you adjust the amplitude (Vpp) on the More apps Generator? Vpp seems fixed at 2.5V. Pretty useless.

Maybe I'm just doing it wrong. Really like some help.

9

General Technical Chat / Re: Ahhhh!!! Terrifying! The UK just deployed the country alert system

« Last post by xvr on Today at 05:18:05 pm »

Windy.com Wind chart for Ireland around 9am if the link doesn't work.
I see 128km/h winds.

Dublin - no any syrens, no alert messages, just falling roofs 

10

Test Equipment / Re: BNC protector caps

« Last post by joeqsmith on Today at 05:16:21 pm »

That's why I have some without a center pin, which you don't need if you just want to protect the jacks from dust.
Amazon

Much better setup.