Raspberry Pi Forums

hendrixjl

Doh! I knew that!
Thanks a bunch!

hendrixjl

Frustration.
I tried each option. If the link succeeded, _start, et. al. wasn't there.
If the link failed, it said, "can't find c_irq_handler"

Thanks for the help.

hendrixjl

jnc100 helped me get my bare metal code at https://github.com/hendrixjl/rPi/blob/master/Makefile linking, but now... I need _start (in .text.boot section) to appear at address 08000, but it is not showing up *anywhere* now when I build. It is at the top of libbare_metal.a, and the linker script has ...

hendrixjl

Thanks a bunch!
I see you also fixed my divide issue by including libgcc.
That helps a lot.
John

hendrixjl

That was from the "desperately trying anything" department. Sometimes, I've noticed that libraries that come early in the link list can't get all of their undefined symbols from later in the link list. I've never understood it, mind you.

But that doesn't apply in this situation.

hendrixjl

For what it is worth: $ arm-none-eabi-nm bare_metal/libbare_metal.a kmain.o: U init_bars 00000000 T kmain U _Z16maneuver_programv stdout.o: U uart_put U uart_putc U uart_puts 00000000 T _Z5writec 00000034 T _Z5writePKc 00000060 T _Z5writePKvj timeUtils.o: U busyloop 00000000 T udelay bootstrap.o: 00...

hendrixjl

I gave it a try (declaring the whole function within extern "C"). Same problem.
I'm pretty sure that the pattern I used works to force the C++ compiler to not mangle the function name when it is actually defined. Which is to say, I think mine and your definition syntax do the same thing.

hendrixjl

I've been working a project at https://github.com/hendrixjl/rPi to do some simple stuff with my Pi and a Rock Crawler (TM). I've reached a point where I can compile it for the Pi's linux using: make CC=gcc CPP=g++ AS=g++ LD=g++ and run it just fine. It is meant to compile and run bare metal using: m...

hendrixjl

Does someone make a lightweight "turntable-like" thing that you could mount a camera (or other sensor) on and programmatically swivel it around clockwise-counterclockwise in two dimensions?

hendrixjl

Just curious techpaul: what did you use to draw those diagrams?
Thanks,

hendrixjl

No, I never got it working.

hendrixjl

Thanks for all of the replies and all of the information.

I have another goal of keeping weight down. I guess I need to regroup on this one.

Let me ask, Does anyone think 6 AAs in series would be able to run the Pi + WiFi?

I'm also interested in a lower-power digital rf link for tty.

hendrixjl

Thanks for the info. I didn't know anything about the resistor "in front". What does "in front" mean?

hendrixjl

Yea, it was 7805A. You were right, of course; I'm not getting 5. My voltmeter is wobbly (analog), but I seem to be around 3.5v. The 7805 is pretty warm.... could I get better voltage if I put two 7805's in parallel so that that they have to support less amperage? As you might have guessed, I'm not e...

hendrixjl

I can get my raspberry pi to come up under battery power - for instance, I'm currently using a 6volt "lantern" battery (the big one). One thing I can't get to work is the USB WiFi under battery power. I'm running the 6 volts through a 7508A 5-volt voltage regulator (which should support up...

hendrixjl

It started acting up again. I first noticed files in /usr/include/boost with ".dpkg.new" at the end, instead of what was supposed to be there.
I'm setting up a new SD Card for my Pi.

hendrixjl

I made the changes again tonight (they were "forgotten" from last night). This time I typed "sync" for good measure. I've rebooted a couple of times and the changes seem to be sticking now.
Oh well.
I'm suspicious of my SD card. Think I'll set up a backup.
John

hendrixjl

I used sudo reboot last night. That should not require a sync by me.
I'll play with it some more when I get home from work.

hendrixjl

Yesterday I posted a problem with apt-get, today..... Between reboots, my raspberry pi (linux) disk goes back to original state. I've been happily using my Pi for a while. Yesterday, apparently, I entered the twilight zone. I install boost program options. When I turn it off and back on, they are no...

hendrixjl

Any ideas? Is it safe to just delete /var/lib/dpkg/status and try again? $ sudo apt-get update Hit http://mirrordirector.raspbian.org wheezy InRelease Hit http://archive.raspberrypi.org wheezy InRelease Hit http://mirrordirector.raspbian.org wheezy/main armhf Packages Hit http://archive.raspberrypi....

hendrixjl

Thanks for the replies, but I'm asking about bus 0 on connector P5 (rev 2 board) pins 2 and 3. I wanted to open up another i2c bus.

hendrixjl

To be more clear.... I would like to be able to use the i2c libraries under linux. For instance, I would like to do
i2cdetect -y 0
and detect it.

hendrixjl

I understand that GPIO 28 and 29 (on P5) have ALT0 configuration of i2c sda0 and scl0 (rev 2 boards). How - under the raspbian linux with the GPIO configuration - can I select the ALT0 function for these two pins?

hendrixjl

I'm desperately looking for a description of the primary and alternate functions for gpio 28, 29, 30 and 31 which are on the rev 2 board P5 connector. Can someone help? Is this the right forum?
Thanks,
John

hendrixjl

I bought a Rock Crawler like this one ( http://www.toysrus.com/product/index.jsp?productId=11892055&CAWELAID=1064647239&pla=plat&cagpspn=pla ) at Dirt Cheap and thought, "I could attach a Pi to that!" So, I've started a project that may lead no where. I've started blogging it, ...

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