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Re: RPi C Development
¿ªÔÆÌåÓýJack - Linux isn't that hard.? I've just about had it up to
you-know-where with the sloppyware from Washington state.? I am
about to give all their software the boot.? This email is being
sent by the Linux? Thunderbird Gerry Sent by the Thunderbird On 2021-05-25 12:27 p.m., Jack, W8TEE
via groups.io wrote:
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Re: RPi C Development
Vince Vielhaber
Odd, I programmed on a MicroVAX with VMS 4.7 for years and never had that problem. Both C and Fortran. The documentation sucked tho and a lot of the function names were even too long for the compiler to accept.
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Vince - K8ZW. On 05/25/2021 01:35 PM, jerry@... wrote:
Many moons ago, I did a project on a MicroVax, running VMS. I remember --
K8ZW |
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Re: RPi C Development
Many moons ago, I did a project on a MicroVax, running VMS. I remember *hating* the serial driver - it was way too smart. It knew about things
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that were really application business. It was serious effort to dumb it down to just "send the characters I want you to send and give me verbatim whatever you receive". - Jerry On 2021-05-25 10:27, Jack, W8TEE via groups.io wrote:
Jerry. Arv: |
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Re: RPi C Development
Jack, W8TEE
Thanks, Farhan. I think I can find the make file for it using gcc. Jack, W8TEE
On Tuesday, May 25, 2021, 12:10:57 PM EDT, Ashhar Farhan <farhanbox@...> wrote:
Jack, You write using your favourite editor, mine is vim. Then, there is a batch file called build that compiles it with gcc. For debugging you can use gdb. It is standard gnu C toolchain. - f On Tue 25 May, 2021, 8:59 PM Jack, W8TEE via , <jjpurdum=[email protected]> wrote:
-- Jack, W8TEE |
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Re: RPi C Development
Jack, W8TEE
Jerry. Arv: I haven't used Linux at all recently. The last time I was on a VAX machine, we had a version of Unix running, but that was decades ago. There would be a very steep learning curve for this old dog. Jack, W8TEE
On Tuesday, May 25, 2021, 12:00:48 PM EDT, Arv Evans <arvid.evans@...> wrote:
Jack The Pi is just another computer that is capable of running all the Linux programs and even some of the Windows applications.? Any of the coding environments that are available in Linux, or any of the other UNIX derivatives, will work on a Pi.? There is even talk of running Microsoft Windows on a Raspberry Pi. That discussion involves questions regarding whether to run Windows on top of Linux, or Linux on top of Windows...or whether to use multi-boot to select which one you want to run. Arv _._ On Tue, May 25, 2021 at 9:29 AM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
-- Jack, W8TEE |
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Re: No CAT
Yes, MMBT3904.
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On Tue, May 25, 2021 at 09:56 AM, Shaun Scannell wrote: it looks like this is MMBT3904 in SOT-23 package.? Unless I'm doing something wrong here. |
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Re: No CAT
Yes, Q90 is a 2n3904.
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If it is surface mount (I believe that is true of all uBitx versions), then the correct part number is MMBT3904, in a SOT-23 package. You could remove a surface mount MMBT3904 (perhaps just clip the leads), and replace it with a leaded 2n3904 by soldering the wire leads to nearby caps and resistors. Jerry, KE7ER On Tue, May 25, 2021 at 09:42 AM, Shaun Scannell wrote: Thanks for al =l the responses.? Thanks again Evan for your most valuable input.? It looks like you are right about Q90.? Looks like Base / Collector short. Basically 12 volts on each with mike button pressed.? Is this still a 2N3904?? I'm not sure what the package is called.? Maybe someone could enlighten me please? |
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Re: No CAT
Thanks for al =l the responses.? Thanks again Evan for your most valuable input.? It looks like you are right about Q90.? Looks like Base / Collector short. Basically 12 volts on each with mike button pressed.? Is this still a 2N3904?? I'm not sure what the package is called.? Maybe someone could enlighten me please?
73 Shaun G3ZSU |
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Re: RPi C Development
The Arduino IDE also uses the gcc compiler.
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The big advance of Arduino was to provide consistent ways to easily talk to low level? hardware across a number of different processors. They try to make it easier for noobies to do simple things by automating a few minor details, which makes it more difficult for everybody else to do not-so-simple things. In my opinion, Arduino should have aimed at being more transparent about what was going on. Which, in my opinion, means they really screwed up by going with C++ instead of vanilla C. I find it a great relief to move back to a unix/linux shell prompt and direct access to the gcc tool chain after doing battle with Arduino. Jack has 50 years experience with C, none of the above is news to him. He is more comfortable with Arduino and C++ than I. His opinions likely differ. Jerry, KE7ER On Tue, May 25, 2021 at 09:17 AM, jerry@... wrote:
C code is generally compiled with gcc. I just edited a file: tryit.c |
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Re: Cheap Chinese Linear LPF
Glad you're working on those low pass filters.? Last year I build multiple?bandpass filters for our field day efforts.....WOW that turned out to be a huge pain in the rear, and I never realized how difficult it can be to get a lumped constant filter to work the way you want.? ?Either my capacitors or my inductors or the data I was given were seriously out of whack.....but eventually I had multiple?filters done, including an 80m CW and 75M phone that provided reasonable separation.? ? Gordon Hello, |
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Re: RPi C Development
C code is generally compiled with gcc. I just edited a file: tryit.c
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---------snip------------ #include <stdio.h> int main() { printf( "hello, world\n" ); } ------------ endsnip -------- At the command line, I said "gcc tryit.c". The output file was called "a.out". I typed "a.out" ( the standard output file of gcc ) ...and it answered "hello, world"; To analyze source, I use a tool called "cscope", which was written by ATT approximately 1 zillion years ago. To debug: gdb. There are also a few graphical-based tools that run on top of gdb. Haven't even scratched the surface. As I said, Linux programming is a vast world. - Jerry KF6VB On 2021-05-25 08:54, jerry@... wrote:
Jack, |
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Re: RPi C Development
Jack, You write using your favourite editor, mine is vim. Then, there is a batch file called build that compiles it with gcc. For debugging you can use gdb. It is standard gnu C toolchain. - f On Tue 25 May, 2021, 8:59 PM Jack, W8TEE via , <jjpurdum=[email protected]> wrote:
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Re: RPi C Development
Jack,
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Raspberry pi coding environment - it's a Linux machine. There is a vast wealth of programming possibilities. Every language you could imagine. I generally connect to my Linux boxes via SSH, and write programs on a text editor. There are text-based debuggers, graphics-based debuggers. And much etc. It's a far bigger programming world than Arduino/teensy/PIC etc. - Jerry KF6VB On 2021-05-25 08:29, Jack, W8TEE via groups.io wrote:
In Farhan's talk, he showed some C code that he wrote for the RPi. I |
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Re: RPi C Development
Jack The Pi is just another computer that is capable of running all the Linux programs and even some of the Windows applications.? Any of the coding environments that are available in Linux, or any of the other UNIX derivatives, will work on a Pi.? There is even talk of running Microsoft Windows on a Raspberry Pi. That discussion involves questions regarding whether to run Windows on top of Linux, or Linux on top of Windows...or whether to use multi-boot to select which one you want to run. Arv _._ On Tue, May 25, 2021 at 9:29 AM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
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Cheap Chinese Linear LPF
Hello,
Adventure continues on my cheap Chinese linear - a necessity for the ubitx - because nobody hears me without it. Spending some time this morning characterizing the switchable LPF on a NanoVNA. Good news and bad news: 80M - pretty hosed. Filter knee is below 3.5MHz. By 4MHz it's 3 db down. And input SWR varies from 4:1 to 7:1 across the band. 40M - perfect. Filter knee is around 8MHz, and input SWR nearly 1:1 across the band. Rejection is -28dB at the second harmonic 20M - overly broad. Filter knee is around 22MHz. Good in-band SWR. Only -10dB at the second harmonic. 10/15M - filter knee at 28MHz. Input SWR starts to climb at 26MHz, 2:1 at 29.5MHz. - Jerry KF6VB |
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Re: Farhan to give sBITX talk at FDIM
Now that¡¯s music to my ears! You did mention that one could use a mouse or a keyboard to control, so I figured that this wouldn¡¯t be difficult. The one disadvantage to the Pi is the long boot time, but people who are smarter than I am tell me that this is mostly due to sanity checks and such, most of which can be avoided to make the boot time faster. Exciting stuff!
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Buddy Brannan, KB5ELV - Erie, PA Email: buddy@... Mobile: (814) 431-0962 On May 25, 2021, at 1:54 AM, Ashhar Farhan <farhanbox@...> wrote: |
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Re: Farhan to give sBITX talk at FDIM
Buddy, I didn't have the time to say this.- at it's core, the sbitx is entirely a text based sdr. all the commands between the GUI and the sdr core are in text strings. I thought of it right at the beginning and structured it that way. with a small keyboard (or if someone cal write a keyer to ascii converter) you can pretty much operate it entirely from the keyboar. That's how i test it anyway. -f On Tue, May 25, 2021 at 10:26 AM Buddy Brannan <buddy@...> wrote: I was sort of listening to all of these while doing other things, but it seems to me that I was able to follow quite a lot of this, slides or no. I¡¯m blind, so that I was able to follow the presentations mostly says either 1) I have no idea what I¡¯m doing (not impossible), or 2) people do a good job of explaining without a lot of ¡°As you can see by this thing over here¡± kinds of explanations. Anyway, using a Pi to do a lot of the grunt work means more room for accessibility extensions, like things that talk and extra buttons in place of touch screen icons, or something. I suppose this means I should probably try to learn something useful and get going. ¡ |
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