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by chipace
Tue Jul 07, 2020 8:56 pm
Forum: General discussion
Topic: Overclocking past 2.147GHz on the Pi4
Replies: 16
Views: 910

Re: Overclocking past 2.147GHz on the Pi4

I am looking forward to higher frequencies for making my web browser more responsive. I just need the peak performance for brief periods of time. The next RPi needs a kick-ass DCDC converter.
by chipace
Fri Jul 03, 2020 7:02 am
Forum: General discussion
Topic: Yesterday, another 3 Pi4Bs 2GB died within 2 hours. Now it's 5 out of 20 dead.
Replies: 54
Views: 3480

Re: Yesterday, another 3 Pi4Bs 2GB died within 2 hours. Now it's 5 out of 20 dead.

Physical damage might be done to the USB-C socket. Could the boards be powered by driving 5V to the 5V pin on the 40 pin header? I am guilty of powering off my board by pulling the USB-C connector. I really should be pulling the wall adapter out.
It would be interesting to find the root cause.
by chipace
Mon Jun 29, 2020 9:57 pm
Forum: General discussion
Topic: Ds18b20 stuck reading same temperature
Replies: 10
Views: 292

Re: Ds18b20 stuck reading same temperature

viewtopic.php?t=164059

If you power the sensor with a GPIO you can toggle it to reset the sensor.
by chipace
Mon Jun 29, 2020 2:41 am
Forum: General discussion
Topic: spi and pigpio questions
Replies: 8
Views: 292

Re: spi and pigpio questions

I looked up the Pi 4 clock - looks like it's 1.5ghz, not 150mhz - correct? I'm actually doing development with a Pi 3, but my target device is the Pi zero... I was referring to the APB clock speed (sometimes called core-clock). For the Pi 3 it is 250MHz. So the divisions for the SPI clock will be s...
by chipace
Sun Jun 28, 2020 11:02 pm
Forum: General discussion
Topic: spi and pigpio questions
Replies: 8
Views: 292

Re: spi and pigpio questions

I use the RPi's SPI bus myself. Your TI part can do 32k samples per second. 4 channels with 3 bytes per sample is 12 bytes every 32kHz. 32k *12 * 8 = 3.07MHz clock. Your minimum SPI clock will need to be over 3MHz. If you want to bit-bang SPI you need to be able to average better than 3MHz. If you u...
by chipace
Fri Jun 19, 2020 5:57 pm
Forum: Compute Module
Topic: i2c not working with the GPIO pin 2 and 3
Replies: 10
Views: 429

Re: i2c not working with the GPIO pin 2 and 3

I have a RPi4b 2GB board that does the same thing. It was working for a couple of months then I see the same result as you do. I bought another and it is working well. The broken one now just does NAS/ssh/torrent and media player.
by chipace
Sun Jun 07, 2020 5:42 pm
Forum: General discussion
Topic: Future of Raspberry Pi
Replies: 37
Views: 2286

Re: Future of Raspberry Pi

Presumably you will have read and referenced the vast amounts of detail in the public Annual Reviews, Trustees' Reports and Strategy Documents published on the Raspberry Pi website and linked from the foot of this page - https://www.raspberrypi.org/about/ Here are a couple of links that can provide...
by chipace
Sun Jun 07, 2020 2:54 am
Forum: General discussion
Topic: Real time gpio functions for next Broadcom SOC
Replies: 5
Views: 272

Real time gpio functions for next Broadcom SOC

It would be really good if the next Broadcom SOC could have some new real-time functions for the GPIO pins. These would be hardware timers and pattern drivers/recorders to/from DRAM memory. I presently use a FPGA to drive and record patterns, as well as measure high and low duration on pins, and the...
by chipace
Tue Jun 02, 2020 5:57 am
Forum: General discussion
Topic: Voltage and current on a GPIO pin RPi-Arduino
Replies: 5
Views: 313

Re: Voltage and current on a GPIO pin RPi-Arduino

You could be better off with an adjustable voltage regulator (linear). They are about $2 and you need two resistors (and cap) to get your desired voltage. LM317. Buy 5 of them and one of those resistor kits with various values for a total of $20 and never be without an exact voltage ever again. http...
by chipace
Mon Jun 01, 2020 2:37 am
Forum: General discussion
Topic: STICKY: Raspberry Pi OS (64 bit) beta test version feedback
Replies: 208
Views: 26856

Re: Raspberry Pi OS (64 bit) beta test version

I2C, SPI, gpio all appear to be working fine. I was able to GVFS mount a smb drive and play mp3s using audacious with a bluetooth headset. It looks very promising, and I can't wait for this to leave beta. Running the a72 cores with a 32bit OS has been a necessary evil, but soon that will be behind u...
by chipace
Thu May 14, 2020 10:49 pm
Forum: General discussion
Topic: where to buy?
Replies: 9
Views: 471

Re: where to buy?

For US sellers: Adafruit is about $10 for tax and shipping (they charge sales tax even for out-of-state orders) PiShop is $8 shipping (I don't think they charge tax) CanaKit is $10 shipping (I don't think they charge tax) I normally buy from Adafruit as I will also pick up headers and jumper wire. P...
by chipace
Tue Apr 07, 2020 8:16 pm
Forum: General discussion
Topic: I need help Raspberry Pi Nas setup
Replies: 4
Views: 287

Re: I need help Raspberry Pi Nas setup

I moved my home NAS to my RPi4 5 months ago and I have not had any issues yet. I have 2 HDDs attached presently, one 5TB 2.5inch and one 10TB 3.5inch. The 5TB is powered thru USB and the 10TB has its own adapter. I don't use raid and I set the hardware spin down on the usb drives to be 1 hour. I use...
by chipace
Mon Apr 06, 2020 11:02 pm
Forum: General discussion
Topic: New 2711 datasheet available
Replies: 32
Views: 2348

Re: New 2711 datasheet available

I2C clock stretching fixed! Also 16bit (65k) byte limit for I2C DLEN!
Now if I could get my favorite python drivers to use the new features (smbus).
by chipace
Thu Mar 12, 2020 9:15 pm
Forum: General discussion
Topic: lower SD writes to zero, how to eventually stop jbd2
Replies: 8
Views: 568

Re: lower SD writes to zero, how to eventually stop jbd2

If you get a higher capacity SD card, won't that solve your issue with write cycles? 32GB Samsung cards are $7 on Amazon. I have yet to hit an issue with any of my RPi which are running 24/7 for 3 years.
by chipace
Wed Feb 26, 2020 5:44 pm
Forum: General discussion
Topic: Pi4 1GB Availability? US Distributor Shows It As Discontinued
Replies: 27
Views: 2362

Re: Pi4 1GB Availability? US Distributor Shows It As Discontinued

Maybe there is a new RPi4 version that will be announced on March 14th. I'm thinking even odds on that.
by chipace
Wed Feb 19, 2020 11:28 pm
Forum: Advanced users
Topic: Create an (ISO/BIN) Image
Replies: 6
Views: 410

Re: Create an (ISO/BIN) Image

It would be cool if the Raspbian included "SD Card Copier" allowed creation of an image file (the same format as the ones that can be downloaded from the official site). If a valid destination device is not present (USB drive, usb adapter with micro sd card) there is no option to write to a file. Ju...
by chipace
Fri Feb 14, 2020 8:34 pm
Forum: General discussion
Topic: What will be likely the next "value node" for the raspberry pi in 2025
Replies: 6
Views: 463

Re: What will be likely the next "value node" for the raspberry pi in 2025

Broadcom makes the silicon, so I would look at what they are selling today... and assume that it is value in 5 years. So do you want to know what ARM cores and IP Broadcom is making today?
by chipace
Tue Jan 28, 2020 11:38 pm
Forum: Advanced users
Topic: How to power up external Hard Disk
Replies: 5
Views: 597

Re: How to power up external Hard Disk

I would buy a single 8TB external drive (with wall power supply) and recycle your old internal HDDs. Less hassle for the same money spent. It is a single point of failure, you will need another backup (or 2).
I was faced with a similar choice recently, and this is the way I went.
by chipace
Mon Jan 27, 2020 6:14 pm
Forum: General discussion
Topic: dvd cd player
Replies: 4
Views: 753

Re: dvd cd player

Are you looking for a specific usb cd/dvd drive which will work with the latest raspbian software?

I saw this thread:
https://www.raspberrypi.org/forums/view ... p?t=189977

No specific recommendations made there.
by chipace
Thu Jan 23, 2020 11:13 pm
Forum: General discussion
Topic: Fail2ban not sending email notifications
Replies: 6
Views: 653

Re: Fail2ban not sending email notifications

I use msmtp to send emails from my gmail account.
I have a /etc/msmtprc file with my credentials.
by chipace
Thu Jan 23, 2020 10:24 pm
Forum: General discussion
Topic: Obvious, but you should not miss that!
Replies: 19
Views: 1571

Re: Obvious, but you should not miss that!

Imperf3kt wrote:
Wed Jan 22, 2020 11:54 pm

Personally, I always use mine on a clean, wooden surface.
I use a desk made of https://en.wikipedia.org/wiki/Quercus_robur out of respect for Eben Upton. It was blessed by a pastor from the church of raspberry pi.
by chipace
Thu Jan 23, 2020 10:11 pm
Forum: General discussion
Topic: iPad pro connection to Raspberry Pi4
Replies: 4
Views: 384

Re: iPad pro connection to Raspberry Pi4

I connect to a iphone 6s with that cable without issue.
Then i backup my photos/videos.
https://github.com/charkster/iphone_photo_backup
by chipace
Mon Jan 20, 2020 6:04 am
Forum: General discussion
Topic: Raspberry and FPGA
Replies: 17
Views: 2034

Re: Raspberry and FPGA

I looked at rev E and rev F of the board schematics, and the QSPI Flash only connects to the Zynq. I believe boundary scan is your only option. It looks like JTAG is available on one of the pin headers. As Zynq is Xilinix, the app note I listed earlier should help. If I had to program the Flash with...
by chipace
Mon Jan 20, 2020 5:31 am
Forum: General discussion
Topic: How to work around power limitations of the USB ports on the Pi4?
Replies: 9
Views: 935

Re: How to work around power limitations of the USB ports on the Pi4?

Rather than pay $20 for a new powered USB 3.0 hub, you could put the money towards a new powered USB HDD. Don't know if you need more than 512GB, but 8TB drives are a little over $100 these days. Lots of space to grow into.

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