Raspberry Pi Forums

lilzz

Not sure what the third define is - have you copied it correctly? But the other two simple define A to be (1) and B to be (2) - remember the preprocessor is a direct text substitution. The second question ,sysconf returns a long int, that's probably a 64 bit value but it depends on the build IRC. _...

lilzz

DougieLawson wrote:The edimax driver in Linux/Raspbian does NOT support ad-hoc.

You need a special driver to support running an edimax as an access point. AFAIK there is no ad-hoc driver available.

so if it supports it. iwlist AP should list its capability ?

lilzz

#define A (1) #define B (2) #define C(32) what does that means? It's not a dimension of the array. PageSize = sysconf(_SC_PAGESIZE); PageMask = (~(PageSize-1)); addr_start = IO_BASE & PageMask; addr_offset = IO_BASE & ~PageMask; So the sysconf function finds out the system's page size. But what's a...

lilzz

I have one the Edimax wifi adapter and on spec it says it support adhoc.

I did

Code: Select all

 iwlist AP

Nothing is shown. Can adhoc ability be shown programmatically?

lilzz

ShiftPlusOne wrote:As with the other thread, please provide context. Are you trying to get support for a pi-like knock-off sbc?

just for learning process as I look at other stuffs and I do comparison. I don't have any other system on hand besides the Pi.

lilzz

https://github.com/raspberrypi/linux/blob/rpi-3.12.y/arch/arm/mach-bcm2708/bcm2708_gpio.c thanks, if that bcm2708_gpio.c is not available, can I use the generic gpiolib instead under the drivers/gpio folder? this is a general question because I see a lot of chipsets outside of broad com do not prov...

lilzz

I see a folder named boot/ contains gzrom.bin, initrd.pz, ramdisk.tar.gz, vmlinux /bootloader contains pmon.tgz, u-boot.tar.gz /kernel contains linux-2.6.21.5.tar.gz and linux-2.6.32-20140325.tar.gz /os contains minisys.tar.gz questions, 1) which one get boot first? in boot folder or boot loader fol...

lilzz

https://github.com/raspberrypi/linux/tr ... ivers/gpio

I don't see any gpio specifically for the pi?

lilzz

I am looking at the Pi kernel and see this

https://github.com/raspberrypi/linux/tr ... /bcm2835.c

when does pi use that file? Not at at the booting stage because at booting it uses boot code.bin.

lilzz

import matplotlib # Force matplotlib to not use any Xwindows backend. matplotlib.use('Agg') from matplotlib import pyplot from matplotlib import dates fig = pyplot.figure() ax = fig.add_subplot(111) ax.xaxis.set_major_locator(dates.HourLocator(interval=6)) ax.xaxis.set_major_formatter(hfmt) pylab.x...

lilzz

max-load-1=24
reboot the device if the load goes over 24 over 1 minute. you would have needed 24 Raspberry Pi to complete that task in 1 minute

what does that means?

lilzz

if the pi is unresponsive then I like the circuit to pulse a reset signal to the pi.

the question, how should I check for the Pi is non responsive software wise?
And LM335 watchdog timer would be used to generate the reset pulse ?

lilzz

RaTTuS wrote:http://www.raspberrypi.org/forums/viewforum.php?f=98
is going to be the best you can do.
unless you are ordering millions you will not get access to the SOC

is there a computer module that use the same SOC as the Pi?

lilzz

if i use DDR3 memory instead of DDR2 or vice versa that means I need to program the memory registers. But I do not have source of boot code.bin to tweak those memory register timings so I guess its not possible then? The memory is PoP stacked on top of the SOC: http://en.wikipedia.org/wiki/Package_...

lilzz

if i use DDR3 memory instead of DDR2 or vice versa that means I need to program the memory registers. But I do not have source of boot code.bin to tweak those memory register timings so I guess its not possible then?

lilzz

No, I am not using a 78xx regulator I am using a 12VDC to 5VDC step down LM2576H-5V which is supposedly over 90% efficient, its switching regulator not a linear regulator and it gets hot.

I couldn't think of anything else besides getting the Pi consumes lower power.

lilzz

I have Pi unit running remotely by SSH into it. I do not need GPU therefore I like Pi to disable to converse power.

I have a custom voltage generator generates 5V to supply the Pi but voltage regulator is awfully hot as now.

I like to disable GPU and hopefully regulator gets less hot.

lilzz

Broadcom Intellectual Property Rights It's nothing more than init their chipset SOC, broadcom's business is selling chipsets. No point in hiding those code. They got no use outside of the specific chipset. In fact, most companies give away their chipset specific driver codes so to enable widespread...

lilzz

The whole Pi project is for learning. Why need to cover them up?

lilzz

gordon@drogon.net wrote: ioremap is a Linux kernel call AIUI. mmap works from userland.

Is the MIPS code you're looking at running in the Kernel or a user program?

-Gordon

End goal is I want to use it in the user land.
So, is that means I can adopt the ARM code for the MIPS ?

lilzz

For Pi ARM GPIO is accessed through memory mapped gpio_map = (uint32_t *)mmap( (caddr_t)gpio_mem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, mem_fd, GPIO_BASE); *(gpio_map+offset) =value where gpio_map is virtual address. different GPIO is accessed through different offset. For MIPS the...

lilzz

I like study the Pi boot up sequence from Kernel Source
Where I should get start

Bootup , and register initialization of SOC I like to find out more about that.

what's sequence of files I should study under the kernel source?

lilzz

#define GPIO_CHIP(_bank) { \ .irq_base = IRQ_GPIO_BASE_ ## _bank, \ .gpio_chip = { \ .label = "Bank " # _bank, \ .owner = THIS_MODULE, \ .set = gpio_set_value, \ .get = gpio_get_value, \ .direction_output =gpio_direction_output, \ .direction_input = gpio_direction_input, \ .base = GPIO_BASE_ ## _ba...

lilzz

Install a tool called Fing. That runs on windows, Mac, android, Linux (including Raspbian) and will scan your network and identify your RPi. Once you find your RPi you can SSH in to run raspi-config. This is assuming Pi getting IP address successfully all by itself without any assistance. What if t...

lilzz

I put the OS into the SDCard and I do not have a monitor to hook to the Pi. How to run rasp-config on Pi without monitor? I don't know the IP address of Pi so I don't know how SSH into it. http://www.raspberrypi.org/documentation/remote-access/README.md You were given this link in your other thread...

Search found 411 matches

Re: The following defines and linux codes

Re: iwlist finding out Wifi adaptor's adhoc ability

The following defines and linux codes

iwlist finding out Wifi adaptor's adhoc ability

Re: Does Pi use gpio driver?

Re: Does Pi use gpio driver?

linux, how does this work ?

Does Pi use gpio driver?

When the Pi use bcm2835.c?

matplotlib plot not showing up.

/etc/watchdog.conf

how to design a dead man switch for pi

Re: possible to design own version of pi?

Re: possible to design own version of pi?

possible to design own version of pi?

Re: Howto disable GPU manually to converse power?

Howto disable GPU manually to converse power?

Re: Why the boot code.bin and Start.elf aren't open sourced?

Why the boot code.bin and Start.elf aren't open sourced?

Re: ARM versus MIP GPIO.

ARM versus MIPS GPIO.

Boot Sequence from Kernel Source

what's this linux structure?

Re: How to setup Pi first time without monitor?

Re: How to setup Pi first time without monitor?