Raspberry Pi Forums

pixelpop

Your original code worked fine for me. Here is what I ended up with: #!/bin/bash for ((i=0; i<20; i++));do sleep 15 [ -f /media/wpa_supplicant.conf ] && { cp /media/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf break echo "Process completed" } done This runs the for loop 20 times befor...

pixelpop

Thanks, but I have rapidly transitioned into the "if-it-ain't-broke-don't-fix-it" zone. But I am definitely bookmarking this thread and I'm sure I'll need help again with something. So don't go anywhere!

pixelpop

That worked perfectly! I didn't realize how similar bash is to C. Thanks so much to everyone that contributed to this. You guys are a terrific community!

pixelpop

According to ShellCheck, I need to learn more about variable declarations and assignments. :-) I have some work to on this because I also need to add an accumulator that tracks how many times it goes thru the loop and exits after a certain number (probably 20 because that would be 5 minutes at 15s)....

pixelpop

I really appreciate the time you guys are giving me on this. Patching some things together, would this work? #!/bin/bash DIR="/media/pi/WIFI_CONFIG" until $USB_Ready = "ready" do sleep 15; done if [ -d "$DIR" ]; then USB_Ready=ready fi done cp /media/pi/WIFI_CONFIG/config-test.txt /home/pi/config-te...

pixelpop

Using a sleep 5m did work and I can live with it, but it seems kind of kludgy. Is there a way to detect when boot is complete? I've researched it and everything I've seen looks pretty kludgy too. I did see this but not sure what that's all about: On a debian system, you can specify the order somethi...

pixelpop

Well, at least it didn't crash...but it didn't work either. Both the .log and .err files are empty, so I assume the script is running correctly. Which probably means the USB device has not been mounted yet when the script is run. I think my options are preceding the USB check in the script with a 'm...

pixelpop

Fantastic!! Thank you and Merry Christmas to all!!

pixelpop

OK, I have the script running when manually tested and I'm ready (I think) to put it into the crontab. Here is what I have so far: #!/bin/bash if [[ -d /media/pi/WIFI_CONFIG ]]; then cp /media/pi/WIFI_CONFIG/config-test.txt /home/pi/config-test.txt fi then: $ sudo crontab -e ------------------------...

pixelpop

Maybe you can use something like this script: #!/bin/bash if [[ -d /media/pi/target ]]; then cp /some/where/some/file /media/pi/target fi Where target is the volume label of the USB thumb stick and it mounts in /media/pi In combination with @reboot in crontab. Have a look at bash commands here: htt...

pixelpop

The USB device will already be inserted in the Pi when it is turned on, so mounting does not seem to be a problem. But that could change if the Cron (or .sh or whatever it turns out to be) runs at the start of boot-up. But the more I read about how it might be done, the more lost I get.

pixelpop

I am a very noobish Linux guy, so please bear with me. I have a situation where I need to check for the presence of a specific USB device (by volume label) and, if found, copy a specific file from the USB device to a specific location on the SD card. And it needs to do this as part of the boot seque...

pixelpop

LOL...I've had the multi-terminal "doh" moment way too many times.

: homer-computer-doh.jpg (10.91 KiB) Viewed 567 times

pixelpop

Well, I forgot about one other constant that was involved in these issues besides Windows...the operator! :shock: To make a long story short and to limit my humiliation, I had checked my router for connected devices and forgot about my media server being on a Pi. So the whole time I was trying to ch...

pixelpop

This has happened with different cards, different Pi's and different img files. Beats the heck out of me what's going on. I'm still overwriting this current card (man, it takes forever!) and I'll report back what the results are. At this point I'm wondering if it's something with Windows 10, the onl...

pixelpop

Yeah, it has me stumped too. I know the original img file is being written because any changes I made previously to config.txt have to be made again after reflashing. I always use SD Card Formatter to format the card before reflashing, but this time I am going to use the overwrite option to see what...

pixelpop

Nope. I wrote a text file to the /home/pi directory and unplugged the Pi. The booted it back up. The file is still there. BTW, I have also seen this on other Pi's that I have. For instance, I'll change the log-in from pi/raspberry to pi/somethingelse. At some point I need to re-flash the original im...

pixelpop

I'm not even sure if my topic is clear, but I am totally confused. This has happened more than once and today I figure it's time to ask for help. So I needed to install OctoPi from scratch, new img file, format the SD card, write the image using Etcher and boot using the freshly written image. But I...

pixelpop

That $34.99 price is probably about right. I just grabbed the full setup on eBay for $37.39. That hat, cable and cable I/F board can't cost more than a couple of dollars. I'd still be curious (and will try to drill down) about who the first-level manufacturer is. If Waveshare is selling the screen f...

pixelpop

I got a 7" LCD from Wavefront ... Maybe you mean Waveshare? Yes, sorry...I did mean Waveshare. The screen in your pic is the one I have. But I am caught between two scenarios. My design is dependent upon using the RGB LCD HAT interface, but I can find a lot of these screens for less than Waveshare ...

pixelpop

mikronauts wrote: ↑
Fri Nov 15, 2019 10:48 pm
dpi24 is the driver

hdmi_cvt is similar to an x configuration mode line

basically you need electrically matching lcd's that can be configured via the dtoverlay dpi24 dpi_* and hdmi_cvt variables.

Thanks! I learned something today about the Pi. Now I know what to keep my eyes out for!

pixelpop

When you say "driver" I guess I'm thinking of drivers in the traditional sense. And the RGB LCD HAT scenario doesn't have a "driver," per se. The instructions indicate modding the config.txt file to add: dtoverlay=dpi24 enable_dpi_lcd=1 display_default_lcd=1 dpi_group=2 dpi_mode=87 dpi_output_format...

pixelpop

Thanks for the good info. Looks like I have some work to do.

Just FYI, I have attached the schematic for the RGB LCD HAT, but I think your suggestion is probably the best one--settle on a display and then find an adapter based on the display model number.

pixelpop

The Gert doesn't really look much like the RGB LCD HAT image that I posted. My HAT uses a 40-pin GPIO ribbon cable for connecting to the LCD, not a VGA connector. About the only thing the Gert and the HAT have in common is the GPIO connector. I've attached another picture showing the opposite side (...

pixelpop

I got a 7" LCD from Wavefront that comes with an small junction board, an FPC cable and a "RGB LCD HAT" card (pic attached). I know the 50-pin cable is something called a "reverse" or "flipped" FPC cable (meaning that the ends of the cable are flipped...not blue/blue-bare/bare but blue/bare-bare-blu...

Search found 94 matches

Re: USB Find and File Copy on Boot

Re: USB Find and File Copy on Boot

Re: USB Find and File Copy on Boot

Re: USB Find and File Copy on Boot

Re: USB Find and File Copy on Boot

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Re: USB Find and File Copy on Boot

USB Find and File Copy on Boot

Re: Data Persistence Between Flashes

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Data Persistence Between Flashes

Re: LCD GPIO Interface

Re: LCD GPIO Interface

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Re: LCD GPIO Interface

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LCD GPIO Interface