<https://lh4.googleusercontent.com/-HKGIHkUbEBs/Uz0uGFT6tOI/AAAAAAAAAJ4/2RW_Vpai_p8/s1600/gg.png>
On Thursday, 3 April 2014 14:59:51 UTC+5:30, Jacek Radzikowski wrote:
>
> The processor's TRM has full description of the bits in the control
> registers.
>
> j.
>
>
> On Thu, Apr 3, 2014 at 5:24 AM, milkyway <muhamme...@gmail.com<javascript:>>
> wrote:
> > Thanks. In the following line it has been chosen 0x00040000 to write in
> to
> > the configuration register.
> > pinconf[0x217c/4] = pinconf[0x217c/4] & 0x0000ffff | 0x00040000; //
> > gpio_149
> >
> > How to select that value?
> >
> >
> > On Wednesday, 2 April 2014 18:19:19 UTC+5:30, Jacek Radzikowski wrote:
> >>
> >> The address is in bytes and pinconf is an array of integers, which are
> >> 4 bytes long.
> >>
> >> j.
> >>
> >>
> >> On Wed, Apr 2, 2014 at 8:02 AM, milkyway <muhamme...@gmail.com> wrote:
> >> > I am new to beagle baord. I have a doubt here. Please help.
> >> >
> >> > In the following line
> >> >
> >> > pinconf[0x217c/4] = pinconf[0x217c/4] & 0x0000ffff | 0x00040000; //
> >> > gpio_149
> >> >
> >> > Why do you need the division inside the pinconf array for indexing?
> >> >
> >> >
> >> > On Wednesday, 7 December 2011 20:26:08 UTC+5:30, dl4mea wrote:
> >> >>
> >> >> Hello,
> >> >>
> >> >> My self given task was to get a LED blinking on the Beagleboard.
> >> >>
> >> >> After getting bored from "echo 0 > brightness" and puzzling together
> >> >> some pieces of code that I found on the net, I finally got a piece
> of
> >> >> plain C code that I can cross compile on a Linux machine and play on
> >> >> the Beagleboard. The two user LEDs as well as one pin of the
> extension
> >> >> connect flash in a 1sec clock with it.
> >> >>
> >> >> No guarantee for completeness, no guarantee for functionality, but
> >> >> here it works.
> >> >>
> >> >> Enjoy!
> >> >>
> >> >> Günter (dl4mea)
> >> >>
> >> >> /* Blinking of user LEDs USR0 and USR1 and gpio_157 on Expansion
> >> >> Connector P2
> >> >> NOTE: gpio_157 is 1.8V IO, possibly not sufficient for a LED
> >> >>
> >> >> disconnect user LEDs from Linux
> >> >> echo none > /sys/class/leds/beagleboard::usr0/trigger; echo none > /
> >> >> sys/class/leds/beagleboard::usr1/trigger;
> >> >>
> >> >> compile using
> >> >> <path_to_cross>/arm-armv6-linux-gnueabi-g++ -static blink.c -o blink
> >> >>
> >> >> References: OMAP35x Applications Processor, Technical Reference
> Manual
> >> >> spruf98u.pdf
> >> >> */
> >> >>
> >> >> #include <stdio.h>
> >> >> #include <stdlib.h>
> >> >> #include <sys/types.h>
> >> >> #include <sys/stat.h>
> >> >> #include <unistd.h>
> >> >> #include <fcntl.h>
> >> >> #include <sys/mman.h>
> >> >>
> >> >> int main(void)
> >> >> {
> >> >>
> >> >> printf ("open file descriptor for PADCONFIG\n");
> >> >> int fd = open("/dev/mem", O_RDWR | O_SYNC); //O_SYNC makes the
> >> >> memory uncacheable
> >> >> if (fd < 0) {
> >> >> printf("Could not open PADCONFIG memory fd\n");
> >> >> return 0;
> >> >> }
> >> >>
> >> >> // Pad configuration
> >> >> printf ("map PINCONFIG\n");
> >> >> volatile ulong *pinconf;
> >> >> pinconf = (ulong*) mmap(NULL, 0x10000, PROT_READ | PROT_WRITE,
> >> >> MAP_SHARED, fd, 0x48000000);
> >> >> if (pinconf == MAP_FAILED) {
> >> >> printf("Pinconf Mapping failed\n");
> >> >> close(fd);
> >> >> return 0;
> >> >> }
> >> >>
> >> >> printf ("set pinconfig GPIO\n");
> >> >> pinconf[0x217c/4] = pinconf[0x217c/4] & 0x0000ffff |
> >> >> 0x00040000; // gpio_149
> >> >> pinconf[0x2180/4] = pinconf[0x2180/4] & 0xffff0000 |
> >> >> 0x00000004; // gpio_150
> >> >> pinconf[0x218c/4] = pinconf[0x218c/4] & 0x0000ffff |
> >> >> 0x00040000; // gpio_157
> >> >> close(fd);
> >> >>
> >> >> /* -------------------------------------- */
> >> >>
> >> >> printf ("open file descriptor for GPIO\n");
> >> >> int gpio_fd = open("/dev/mem", O_RDWR | O_SYNC);
> >> >> if (gpio_fd < 0) {
> >> >> printf("Could not open GPIO memory fd\n");
> >> >> return 0;
> >> >> }
> >> >>
> >> >> // GPIO configuration
> >> >> printf ("map GPIO\n");
> >> >> volatile ulong *gpio;
> >> >> gpio = (ulong*) mmap(NULL, 0x10000, PROT_READ | PROT_WRITE,
> >> >> MAP_SHARED, gpio_fd, 0x49050000);
> >> >> if (gpio == MAP_FAILED) {
> >> >> printf ("GPIO Mapping failed\n");
> >> >> close(gpio_fd);
> >> >> return 0;
> >> >> }
> >> >>
> >> >> printf ("set GPIO config\n");
> >> >>
> >> >> // Configure GPIO pins on bank 5 as output.
> >> >> // GPIO 5 is at physical address 0x49056000 = 0x49050000+0x6000
> >> >> gpio[0x6034/4] &= ~0x20600000; // set low for output
> >> >> // Also disable the wakeupenable and irqenable intertupts
> >> >> // GPIO clear_Wakeupenable is offset by 0x80 for each bank
> >> >> gpio[0x6080/4] = 0x20600000; // 0x1: Clear the
> corresponding
> >> >> bit in the GPIO_WAKEUPENABLE register
> >> >> // GPIO clear_irqenable1 is offset by 0x60 for each bank
> >> >> gpio[0x6060/4] = 0x20600000; // 0x1: Clear the
> corresponding
> >> >> bit in the GPIO_IRQENABLE1 register
> >> >> // GPIO clear_irqenable2 is offset by 0x70 for each bank
> >> >> gpio[0x6070/4] = 0x20600000; // 0x1: Clear the
> corresponding
> >> >> bit in the GPIO_IRQENABLE2 register
> >> >>
> >> >> /* -------------------------------------- */
> >> >>
> >> >> printf ("Toggle Pins\n");
> >> >>
> >> >> int j=0;
> >> >> for (j=0; j<10; j++)
> >> >> {
> >> >> printf ("j=%u\n", j);
> >> >> //clear_data_out has offset 0x90
> >> >> gpio[0x6090/4]=0x20600000;
> >> >> usleep(500000);
> >> >> //set_data_out has offset 0x94
> >> >> gpio[0x6094/4]=0x20600000;
> >> >> usleep(500000);
> >> >> }
> >> >>
> >> >> close(gpio_fd);
> >> >> }
> >> >
> >> > --
> >> > For more options, visit http://beagleboard.org/discuss
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> >>
> >>
> >> --
> >> Given a choice between two theories, take the one which is funnier
> >
> > --
> > For more options, visit http://beagleboard.org/discuss
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>
> --
> Given a choice between two theories, take the one which is funnier
>
--
For more options, visit http://beagleboard.org/discuss
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