Re: [beagleboard] Re: GPIO (LED) access using mmap
Thanks. In the following line it has been chosen 0x0004 to write in to
the configuration register.
pinconf[0x217c/4] = pinconf[0x217c/4] 0x | 0x0004; //
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.comjavascript:
wrote:
I am new to beagle baord. I have a doubt here. Please help.
In the following line
pinconf[0x217c/4] = pinconf[0x217c/4] 0x | 0x0004; //
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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0x4800);
if (pinconf == MAP_FAILED) {
printf(Pinconf Mapping failed\n);
close(fd);
return 0;
}
printf (set pinconfig GPIO\n);
pinconf[0x217c/4] = pinconf[0x217c/4] 0x |
0x0004; // gpio_149
pinconf[0x2180/4] = pinconf[0x2180/4] 0x |
0x0004; // gpio_150
pinconf[0x218c/4] = pinconf[0x218c/4] 0x |
0x0004; // 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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, gpio_fd, 0x4905);
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 = 0x4905+0x6000
gpio[0x6034/4] = ~0x2060; // set low for output
// Also disable the wakeupenable and irqenable intertupts
// GPIO clear_Wakeupenable is offset by 0x80 for each bank
gpio[0x6080/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_WAKEUPENABLE register
// GPIO clear_irqenable1 is offset by 0x60 for each bank
gpio[0x6060/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_IRQENABLE1 register
// GPIO clear_irqenable2 is offset by 0x70 for each bank
gpio[0x6070/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_IRQENABLE2 register
/* -- */
printf (Toggle Pins\n);
int j=0;
for (j=0; j10; j++)
{
printf (j=%u\n, j);
//clear_data_out has offset 0x90
gpio[0x6090/4]=0x2060;
usleep(50);
//set_data_out has offset 0x94
gpio[0x6094/4]=0x2060;
usleep(50);
}
close(gpio_fd);
}
--
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Re: [beagleboard] Re: GPIO (LED) access using mmap
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 muhammednouf...@gmail.com wrote:
Thanks. In the following line it has been chosen 0x0004 to write in to
the configuration register.
pinconf[0x217c/4] = pinconf[0x217c/4] 0x | 0x0004; //
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] 0x | 0x0004; //
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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0x4800);
if (pinconf == MAP_FAILED) {
printf(Pinconf Mapping failed\n);
close(fd);
return 0;
}
printf (set pinconfig GPIO\n);
pinconf[0x217c/4] = pinconf[0x217c/4] 0x |
0x0004; // gpio_149
pinconf[0x2180/4] = pinconf[0x2180/4] 0x |
0x0004; // gpio_150
pinconf[0x218c/4] = pinconf[0x218c/4] 0x |
0x0004; // 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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, gpio_fd, 0x4905);
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 = 0x4905+0x6000
gpio[0x6034/4] = ~0x2060; // set low for output
// Also disable the wakeupenable and irqenable intertupts
// GPIO clear_Wakeupenable is offset by 0x80 for each bank
gpio[0x6080/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_WAKEUPENABLE register
// GPIO clear_irqenable1 is offset by 0x60 for each bank
gpio[0x6060/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_IRQENABLE1 register
// GPIO clear_irqenable2 is offset by 0x70 for each bank
gpio[0x6070/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_IRQENABLE2 register
/* -- */
printf (Toggle Pins\n);
int j=0;
for (j=0; j10; j++)
{
printf (j=%u\n, j);
//clear_data_out has offset 0x90
gpio[0x6090/4]=0x2060;
usleep(50);
//set_data_out has offset 0x94
gpio[0x6094/4]=0x2060;
usleep(50);
}
close(gpio_fd);
}
--
For more options, visit http://beagleboard.org/discuss
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Re: [beagleboard] Re: GPIO (LED) access using mmap
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Re: [beagleboard] Re: GPIO (LED) access using mmap
https://lh4.googleusercontent.com/-HKGIHkUbEBs/Uz0uGFT6tOI/AJ4/2RW_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.comjavascript:
wrote:
Thanks. In the following line it has been chosen 0x0004 to write in
to
the configuration register.
pinconf[0x217c/4] = pinconf[0x217c/4] 0x | 0x0004; //
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] 0x | 0x0004; //
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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0x4800);
if (pinconf == MAP_FAILED) {
printf(Pinconf Mapping failed\n);
close(fd);
return 0;
}
printf (set pinconfig GPIO\n);
pinconf[0x217c/4] = pinconf[0x217c/4] 0x |
0x0004; // gpio_149
pinconf[0x2180/4] = pinconf[0x2180/4] 0x |
0x0004; // gpio_150
pinconf[0x218c/4] = pinconf[0x218c/4] 0x |
0x0004; // 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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, gpio_fd, 0x4905);
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 = 0x4905+0x6000
gpio[0x6034/4] = ~0x2060; // set low for output
// Also disable the wakeupenable and irqenable intertupts
// GPIO clear_Wakeupenable is offset by 0x80 for each bank
gpio[0x6080/4] = 0x2060; // 0x1: Clear the
corresponding
bit in the GPIO_WAKEUPENABLE register
// GPIO clear_irqenable1 is offset by 0x60 for each bank
gpio[0x6060/4] = 0x2060; // 0x1: Clear the
corresponding
bit in the GPIO_IRQENABLE1 register
// GPIO clear_irqenable2 is offset by 0x70 for each bank
gpio[0x6070/4] = 0x2060; // 0x1: Clear the
corresponding
bit in the GPIO_IRQENABLE2 register
/* -- */
printf (Toggle Pins\n);
int j=0;
for (j=0; j10; j++)
{
printf (j=%u\n,
Re: [beagleboard] Re: GPIO (LED) access using mmap
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 muhammednouf...@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] 0x | 0x0004; //
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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0x4800);
if (pinconf == MAP_FAILED) {
printf(Pinconf Mapping failed\n);
close(fd);
return 0;
}
printf (set pinconfig GPIO\n);
pinconf[0x217c/4] = pinconf[0x217c/4] 0x |
0x0004; // gpio_149
pinconf[0x2180/4] = pinconf[0x2180/4] 0x |
0x0004; // gpio_150
pinconf[0x218c/4] = pinconf[0x218c/4] 0x |
0x0004; // 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, 0x1, PROT_READ | PROT_WRITE,
MAP_SHARED, gpio_fd, 0x4905);
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 = 0x4905+0x6000
gpio[0x6034/4] = ~0x2060; // set low for output
// Also disable the wakeupenable and irqenable intertupts
// GPIO clear_Wakeupenable is offset by 0x80 for each bank
gpio[0x6080/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_WAKEUPENABLE register
// GPIO clear_irqenable1 is offset by 0x60 for each bank
gpio[0x6060/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_IRQENABLE1 register
// GPIO clear_irqenable2 is offset by 0x70 for each bank
gpio[0x6070/4] = 0x2060; // 0x1: Clear the corresponding
bit in the GPIO_IRQENABLE2 register
/* -- */
printf (Toggle Pins\n);
int j=0;
for (j=0; j10; j++)
{
printf (j=%u\n, j);
//clear_data_out has offset 0x90
gpio[0x6090/4]=0x2060;
usleep(50);
//set_data_out has offset 0x94
gpio[0x6094/4]=0x2060;
usleep(50);
}
close(gpio_fd);
}
--
For more options, visit http://beagleboard.org/discuss
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