Raspberry Pi Forums

tito-t

hello, is Xlib usable for the Jessie standard GUI desktop? In my C/C++ programs I want to poll mouse position and mouse events (buttonX, buttonY, ri/le buttonClick, buttonDown, buttonUp, buttonDoubleClick) and so on. If Xlib is eventually suitable for this: How can I install it correctly including a...

tito-t

BTW,
InitShapes and FinishShapes are much better and far more comprehensible than the former
init
finish
which are really very much ambiguous by their meanings!

tito-t

ps, I actually expected to read about Dot() in the section Shapes (i.e., presumably at the top of it)...: https://github.com/paeryn/openvg/ Shapes void Line(VGfloat x1, VGfloat y1, VGfloat x2, VGfloat y2) Draw a line between (x1, y1) and (x2, y2). void Rect(VGfloat x, VGfloat y, VGfloat w, VGfloat h...

tito-t

thank you very much, now this compiles without neither (or do you say in English: either ?) moaning: ;) // first OpenVG program // Anthony Starks (ajstarks@gmail.com) // Adapted for paeryn's fork by paeryn #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include "VG/openvg.h" #include "VG...

tito-t

thank you very much for your reply! but now I get the error unbenannt.c:31:12: error: ‘Finish’ was not declared in this scope On your github site there indeed is still the lower case finsh in the examples. Also the new Dot() function has not been mentioned at the start page AFAICS. It would be very ...

tito-t

great,
but could you please post also your code for that which now works as expected ?

tito-t

hello, using openVG I get the compiler warning // first OpenVG program // Anthony Starks (ajstarks@gmail.com) // Adapted for paeryn's fork by paeryn #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include "VG/openvg.h" #include "VG/vgu.h" #include "fontinfo.h" #include "shapes.h" int mai...

tito-t

I fully agree. Unfortunately there actually ARE different example source codes posted in the web, especially if using the wiringPi libs, and so different pin numbering schemes have actually BEEN used then . I personally also would prefer the BCM scheme. Having said that, this is admittedly highly co...

tito-t

hi, for the LCD without buttons (probably different wiring scheme) I found this code, and for that purpose wiringPiSetup() is needed for initializing the GPIOs: #include <wiringPi.h> //WiringPi headers #include <lcd.h> //LCD headers from WiringPi #include <stdio.h> //Needed for the printf function b...

tito-t

Ok thx....where is the config.txt file? I didn't see it on the sd card?

it's probably the same file where you should have added the USB current setting

Code: Select all

#USB current 1.2A
max_usb_current=1

you can access that file by

Code: Select all

sudo leafpad  /boot/config.txt

tito-t

Ok so I very carefully put everything together tonight re set-up. All went smooth until I plugged the power supply in. When I did, a red light went on in the back of the board but nothing came up on the screen as it remained black. I checked the micro sd card on my computer to make sure Noobs was i...

tito-t

fruitoftheloom wrote:
tito-t wrote:is there any reasonable reason for the OP not to use the built-in SD copy tool?

(see: viewtopic.php?f=63&t=163981&p=1059678#p1059538 )
That has been discussed in this thread already, please keep up

is there, or is there not, or are you just trolling?

tito-t

is there any reasonable reason for the OP not to use the built-in SD copy tool?

(see: viewtopic.php?f=63&t=163981&p=1059678#p1059538 )

tito-t

hi, @ Thlorian : what kind of touchscreen exactly do you use? what do the specs say about power requirements (current) ? Just to mention, The power setting for 1.2A (max_usb_current=1 ) is the maximum current allowed through all 4 ports combined (!), IIRC max current at 1 single USB is always limite...

tito-t

hi,
@ 16labs :
maybe I missed that point - how old are the kids you're talking about?

tito-t

some people fixed that issue for UART by disabling Bluetooth (which is using the former UART address now). IIRC, you can enable/disable either one via the raspi-config tool. BTW, IMO it was a bad decision of the PI3 developers to change the UART address in the device tree from all former B/B+/2B Pis...

tito-t

ah, ok, I see! I was curious if you were perhaps from Germany like me, because of some German overviews I have seen (not just tutorials). But its also just for GPIOs and communications, not about a cam. (BTW, I personally would prefer a USB cam instead of the Pi cam because of another reason: IIRC, ...

tito-t

here is another topic which shows very clearly, what newbies to C and the Pi really wish to learn: again GPIO control and cam control by C commands https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=163416 And again Python tutorials with functioning applications (also perhaps using 3rd party li...

tito-t

well, for the first steps one would like to have an easy and convenient access to cam usage, guided by a tutorial (i.e., not just a link to a github repository !!). e.g., like for GPIO control by using wiringPi libs, about which there are also some nice tutorials. Using C for GPIO control as a begin...

tito-t

I also haven't found a really useful cam tutorial in C for beginners yet. The manuals and example files I found (also the ones mentioned above) don't teach anything as they don't guide how to use C commands for cam control step by step, providing good understandable explanations about what they are ...

tito-t

hi,
where are you from / which is your language?

tito-t

wonderful, thank you very much! fflush(stdout); worked from the start! 8)

BTW, I meanwhile exchanged also the miilis() thing by sleep(1);

tito-t

hello, I encountered an unexpected behaviour in a test program, writing a dot '.' each second in a proprietary pthread thread, just for monitoring that the program is still running: volatile int running = 1; void* thread1Go(void *) { unsigned long ms; ms = millis(); while(running) { if ((millis()-ms...

tito-t

if some one is doing some work for a target group he will be well adviced to ask the target group what would be wishful - and listen very carefully to the replies. Otherwise it might probably happen that a lot of work has been done but no one actually reads it and cares about it. I fully agree. +1 ...

tito-t

The website... (we are on the Raspberrypi.org website ;-) ) Repeat them ... as in repeat the website example (wrt the website I am now typing on), that they already have in place, just do it for C. I believe anyone can edit-ish and such like for the site, it just needs approval/some system for C se...

Search found 298 matches

Xlib for Jessie for GUI desktop (or a better alternative)?

Re: what means: openVG command finish() depricated?

Re: what means: openVG command finish() depricated?

Re: what means: openVG command finish() depricated?

Re: what means: openVG command finish() depricated?

Re: Raspberry Pi3 + LCD keypad shield v1.0 + wiringPi

what means: openVG command finish() depricated?

Re: Raspberry Pi3 + LCD keypad shield v1.0 + wiringPi

Re: Raspberry Pi3 + LCD keypad shield v1.0 + wiringPi

Re: Power supply for Hub?

Re: Power supply for Hub?

Re: Copy sd card to another (a bit smaller) card

Re: Copy sd card to another (a bit smaller) card

Re: Power supply for Hub?

Re: Programming for Kids

Re: Raspberry pi 3 - no serial.

Re: Control raspberry pi camera & gpio by C language

Re: The MagPi does C :-)

Re: Control raspberry pi camera & gpio by C language

Re: Control raspberry pi camera & gpio by C language

Re: Control raspberry pi camera & gpio by C language

Re: question about printf() in a pthread thread

question about printf() in a pthread thread

Re: The MagPi does C :-)

Re: The MagPi does C :-)