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by okenido
Sun Jul 07, 2019 9:40 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 995
Views: 548797

Re: STICKY: The I2S sound thread.

I'm currently trying to use a 8 channel DAC the PCM1960 in TDM mode (one I2S interface to control multiple outputs) with my raspberry 3B+ : http://www.ti.com/lit/ds/symlink/pcm1690.pdf Unfortunately it's one of those requiring a Master Clock in addition to the three I2S wires, master clock has to be...
by okenido
Thu Jun 27, 2019 1:57 pm
Forum: General discussion
Topic: Why do I not see 2x speed up in sysbench?
Replies: 5
Views: 1098

Re: Why do I not see 2x speed up in sysbench?

The new cpu IS something between 2-3 times faster, because increased frequency, bigger pipeline, better branch prediction, bigger caches... but it's hard to measure with benchmarks. For example the big cache advantage may only show up on applications using large data sets and large code base (most a...
by okenido
Thu Jun 27, 2019 1:47 pm
Forum: General discussion
Topic: Will USB-C ever replace all other ports or just some?
Replies: 31
Views: 4511

Re: Will USB-C ever replace all other ports or just some?

USB-C is quite good I hope it will replace this trash USB-B connector which is just a total facepalm. USB-A is going to stay forever and my products will support it. No reason to change something that is used everywhere, is cheap and reliable. What wrong with USB-B? A nice robust solid connector th...
by okenido
Thu Jun 27, 2019 12:46 pm
Forum: General discussion
Topic: Will USB-C ever replace all other ports or just some?
Replies: 31
Views: 4511

Re: Will USB-C ever replace all other ports or just some?

USB-C is quite good I hope it will replace this trash USB-B connector which is just a total facepalm.

USB-A is going to stay forever and my products will support it. No reason to change something that is used everywhere, is cheap and reliable.
by okenido
Thu Jun 27, 2019 9:15 am
Forum: General discussion
Topic: About locking topics
Replies: 7
Views: 597

Re: About locking topics

Then create a unique topic dedicated to speculation, so when closing the separate topic moderators can link it
by okenido
Thu Jun 27, 2019 9:14 am
Forum: General discussion
Topic: Why is the RPi4 being advertised as a desktop computer?
Replies: 113
Views: 19057

Re: Why is the RPi4 being advertised as a desktop computer?

well we're playing with words, if any computery-thing laying on a desk can be called a desktop computer then a caravan or a tent is the same as a house, why bother having different words for different things :)
by okenido
Thu Jun 27, 2019 9:05 am
Forum: General discussion
Topic: About locking topics
Replies: 7
Views: 597

About locking topics

https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=243814 This post was made and just locked instantly. I think you guys needs to have some respect for the community, at least respect the author for the time he spends writing the post. Locking topics because they don't please someone shoudn't b...
by okenido
Thu Jun 27, 2019 8:59 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 945
Views: 164450

Re: Raspberry Pi 4 Thread - general discussion

The base RPi 4 B should have started off at 4 GB with a socket to add more. everyone has different needs, personnally I'd even like a 512MB version since my usage needs very little RAM. 4GB is plenty for a computer with this processing power, 8GB would be quite ridiculous, it's the amount of RAM mo...
by okenido
Wed Jun 26, 2019 3:28 pm
Forum: General discussion
Topic: Why is the RPi4 being advertised as a desktop computer?
Replies: 113
Views: 19057

Re: Why is the RPi4 being advertised as a desktop computer?

I woudn't advertise the RPI as a desktop computer (I didnt know it was), yes it could be used for that but it's a bit of a stretch. The general expectations for the word "Desktop Computer" is a powerful device used for working efficiently, you don't care much about its size or power consumption beca...
by okenido
Wed Jun 26, 2019 8:40 am
Forum: Bare metal, Assembly language
Topic: Raspberry Pi 4
Replies: 59
Views: 16040

Re: Raspberry Pi 4

Dunno why in 2019 GPU drivers/programming is still such a pain in the ass. Libraries are huge. APIs are overcomplicated. Drawing a simple 2D line is ridiculously hard if you want proper hardware acceleration... or rely on libraries like OpenVG but it seems quite slow from my experiments. I dream of ...
by okenido
Tue Jun 25, 2019 9:23 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 945
Views: 164450

Re: Raspberry Pi 4 Thread - general discussion

Hi, I have a product using the raspberry 3B+ with bare metal code... I'm using quite a lot of things currently : MMU, NEON SIMD, I2C, I2S, framebuffer access (software rendering), USB mass storage, EMMC read/write access, interrupts... How hard would it be to get it running on the raspberry 4 ? I'm ...
by okenido
Mon Jun 24, 2019 7:55 pm
Forum: Bare metal, Assembly language
Topic: Raspberry Pi 4
Replies: 59
Views: 16040

Re: Raspberry Pi 4

I'm also interested into this... super excited by this new raspberry, but I have already my product developed in bare metal around the RPI 3, wondering how hard it would be to support the new SoC.
I guess the ARM core isn't that much different but I'm more worried about the peripherals.
by okenido
Mon Jun 24, 2019 3:15 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 945
Views: 164450

Re: Raspberry Pi 4 Thread - general discussion

EMMC really isn't a very good option IMO. Less reliable than SD cards over multiple writes and you cannot replace it when it fails, like you can with an SD card. SD also allows the possibility of keeping different software configs and solutions, per SD card. Oh, and as far as controlling costs, I'm...
by okenido
Mon Jun 24, 2019 3:07 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 945
Views: 164450

Re: Raspberry Pi 4 Thread - general discussion

WOW well done the rpi team I'm so excited !! The new cpu with its much longer pipeline has the potential to be 2 times more powerful at the same frequency, and with the much bigger cache and faster memory the announced 3X performance bump seems legit ! Do you know if the I2C bug has been corrected i...
by okenido
Mon Jun 03, 2019 1:54 pm
Forum: General discussion
Topic: Why 80 pin IDE cable fried my Pi
Replies: 11
Views: 916

Re: Why 80 pin IDE cable fried my Pi

That cable WAS DESIGNED and INTENDED FOR USE with IDE drives and NOT FOR THE RPi GPIO. It was your fault for using it, that fried your RPi, not the fault of the designer of the cable. saw this in one article: "....somebody put raw eggs in a microwave oven and it exploded upon turning on....causing ...
by okenido
Mon Jun 03, 2019 1:46 pm
Forum: General discussion
Topic: Why 80 pin IDE cable fried my Pi
Replies: 11
Views: 916

Re: Why 80 pin IDE cable fried my Pi

well, no problem with that, but creating interconnections in a cable with separate pins is misleading in my opinion, such things should be done on the board so the cables stays as standard as possible... but okay !
by okenido
Mon Jun 03, 2019 1:09 pm
Forum: General discussion
Topic: Why 80 pin IDE cable fried my Pi
Replies: 11
Views: 916

Why 80 pin IDE cable fried my Pi

Hello, I know, NOW, that 80 wires IDE cables have pins 2, 19, 22, 24, 26, 30, 34 and 40 shorted together. Misleading design in my opinion... http://lyberty.com/tech/hard_drives/80-conductor-large.jpg But even knowing that, I'm not sure WHY it fried my PI. I provide 5V to pins 2 and 4, and they have ...
by okenido
Sun May 19, 2019 4:55 pm
Forum: General discussion
Topic: Atmega328p + RPI : ICSP programming providing 3.3V
Replies: 6
Views: 891

Re: Atmega328p + RPI : ICSP programming providing 3.3V

we're talking about providing 3.3V though the header pin while everything else is NOT powered -- the raspberry doesn't get its main 5V input You have lost me there. If the RPi does not get its main 5V input, where does the 3.3V output come from? sorry, i talk about providing 3.3V unintentionally wh...
by okenido
Sun May 19, 2019 1:25 pm
Forum: General discussion
Topic: Atmega328p + RPI : ICSP programming providing 3.3V
Replies: 6
Views: 891

Atmega328p + RPI : ICSP programming providing 3.3V

Hi, I made a circuit which uses a raspberry pi and an atmega328p microcontroller, which gets its power from rpi's 3.3V pin. I added an ICSP header so we can program the microcontroller directly on board after everything was assembled. Normally, I would program it before connecting the raspberry pi, ...
by okenido
Wed Apr 03, 2019 12:47 am
Forum: Bare metal, Assembly language
Topic: Setting ARM/core/RAM frequency has no effect
Replies: 2
Views: 1119

Re: Setting ARM/core/RAM frequency has no effect

Okay so it took a while to figure it out, I had literally forgot about this problem. I found it wasn't working because my RPI was undervolted ! (power supply lower than 4.8V). I knew it was undervolted so I hid the little bolt icon, but I haven't tought that it could prevent the CPU from running hig...
by okenido
Tue Feb 26, 2019 2:02 pm
Forum: General discussion
Topic: 64-bit operating system
Replies: 358
Views: 143190

Re: 64-bit operating system

I don't think 64 bit is worth for the raspberry pi 3, i did several tests in bare metal and AARCH64 was slower by 15-20%, probably due to the fact that pointers are twice the size compared to 32 bit so the memory bandwidth is more easily saturated. Even my code using NEON instructions performed wors...
by okenido
Fri Jan 18, 2019 4:54 pm
Forum: General discussion
Topic: Obfuscation thread
Replies: 34
Views: 6134

Re: Obfuscation thread

Some forums (or is that fora) have automatic locking of unloved threads after some months of them sleeping. That would so help to prevent the necroing of ancient crap on here. You're so wrong. This topic is about general things, it's never outdated or finished. Like most topics. I don't know but, y...
by okenido
Fri Jan 18, 2019 4:41 pm
Forum: General discussion
Topic: Obfuscation thread
Replies: 34
Views: 6134

Re: Obfuscation thread

Found it with a google search.
Better than re-creating the same posts over and again.
by okenido
Fri Jan 18, 2019 4:13 pm
Forum: General discussion
Topic: Obfuscation thread
Replies: 34
Views: 6134

Re: Obfuscation thread

I don't quite much agree with all of you. We know offline softwares are all crackable, but the point of obfuscation and other techniques is to make them LESS EASY to crack. If you run a business, making your product harder to reverse engineer gives you an advantage over the product which can be dupl...
by okenido
Wed Jan 09, 2019 11:56 am
Forum: Bare metal, Assembly language
Topic: Setting ARM/core/RAM frequency has no effect
Replies: 2
Views: 1119

Setting ARM/core/RAM frequency has no effect

Hello, I'm using the mailbox interface of the RPI (https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface) in a bare metal app to change frequency settings of arm/core/ram but none of them seems to make the processing faster or slower. Asking the mailbox for the current frequency re...

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