On 05/02/2012 08:16 AM, Sameh Yassin wrote: > Dear P. Balister, > I found that tutorial which explains very well how to create a GPIO folder > and set its direction > http://www.avrfreaks.net/wiki/index.php/Documentation:Linux/GPIO#gpio-sysfs > > > I searched for the misc GPIOs to make sure they are free and I'm pretty sure > that over_gpio0 and overo_gpio170 are free. the are not used at all inside > the code. I connected them to debug led0 and debug_led1 and used echo 1> > /sys/class/gpio/gpio0/value after setting the direction but nothing at all, > the two debug leds are off. >
What version of the e100 image are you using. Can you start by making sure you are using the latest? http://code.ettus.com/redmine/ettus/projects/usrpe1xx/wiki/FAQ#How-do-I-create-re-create-E1xx-SD-Card-Images I think earler images will not have access to gpio0 due to some pinmux stuff in u-boot. I need to double check 170 pinmuxing also. there should be some free gpios in the 20's with the current image. > Another question, what is the difference between gpio0 and gpiochip0 found at > /sys/class/gpio I think the gpiochip entries represent the various banks of gpios. Philip > > > Regards, > S. Yassin > HW Engineer > DLECS > > > ________________________________ > From: Philip Balister <phi...@balister.org> > To: Sameh Yassin <sameh_yassi...@yahoo.com> > Cc: GNURADIO <discuss-gnuradio@gnu.org> > Sent: Wednesday, May 2, 2012 1:33 PM > Subject: Re: [Discuss-gnuradio] E100 - Interface between OMAP3 and FPGA > > On 05/01/2012 04:28 AM, Sameh Yassin wrote: >> Hello Dear , >> >> I used the first link to use overo GPIOs on the E100 to communicate with the >> SPARTN3AN FPGA. >> >> I'm doing the following: >> 1- I chose an empty GPIO input to the FPGA (for example overo_gpio22). >> 2- I modified the FPGA image so that debug_led1 = over_gpio220 >> 3- I'll set and clear overo GPIO using the bash shell as I read in the first >> link that u recommended. >> >> The problem: >> Although the following gpios are free on the FPGA. There are other gpios >> valid on the overo. Srictly speaking >> >> The free GPIOs on the overo >> $ root@usrp-e1xx:/sys/class/gpio# ls >> >> exportgpio16 gpio168 gpiochip128 gpiochip192 gpiochip64 unexport >> gpio15gpio164 gpiochip0 gpiochip160 gpiochip32 gpiochip96 > > It looks like you are running an older version of uhd, which suggests an > older kernel version. The older driver claimed a few extra gpio's for > testing purposes. > > I see: > > root@usrp-e1xx:~# ls /sys/class/gpio/ > export gpio16@ gpio173@ gpiochip128@ gpiochip32@ unexport > gpio114@ gpio164@ gpio175@ gpiochip160@ gpiochip64@ > gpio15@ gpio168@ gpiochip0@ gpiochip192@ gpiochip96@ > > Note the extra gpio's exposed to user space. These are used by uhd for > signaling and configuring the clock generator. > > Philip > >> >> >> The free gpios at the FPGA found at u1e.v >> input overo_gpio0, input overo_gpio14, input overo_gpio21, input >> overo_gpio22, // Misc GPIO >> >> input overo_gpio23, input overo_gpio64, input overo_gpio127, // Misc GPIO >> input overo_gpio176, input overo_gpio163, input overo_gpio170, // Misc GPIO >> >> Is that normal of I did something wrong at the kernel at the overo? >> >> Regards, >> S. Yassin >> HW Engineer >> DLECS >> >> >> ________________________________ >> From: Philip Balister <phi...@balister.org> >> To: Sameh Yassin <sameh_yassi...@yahoo.com> >> Cc: "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org> >> Sent: Saturday, April 28, 2012 2:18 PM >> Subject: Re: [Discuss-gnuradio] E100 - Interface between OMAP3 and FPGA >> >> On 04/28/2012 08:07 AM, Sameh Yassin wrote: >>> Dear all, >>> >>> I need to send data from the OMAP3 to the Spartan3an FPGA. As I understand >>> ,from the wiki and presentations, there are two ways to communicate >>> namely; using setting_reg and GPIO. The second way seems easier so I'll >>> try it first. >>> >>> I intend to set or clear the free GPIOS on the Spartan FPGA such as >>> over_gpio_22. I added the following code to the example tx_waveforms.cpp. >>> >>> static struct gpio gpio_test = { 22, GPIOF_OUT_INIT_LOW, >>> "OVERO_GPIO_22" }; >>> gpio_set_value(22,1); >>> //set gpio22 which is connected to pin IO_L30N_0 >>> >>> >>> I tried to compile then I got the error that can't find GPIO.h. >>> >>> My question: did I use the correct high level function or I used a "lower >>> level" that is used to implement the function? >> >> This is the easiest way to toggle gpio's from userspace. >> >> http://wiki.gumstix.org/index.php?title=GPIO#Accessing_GPIO.27s_from_userland >> >> Also: >> >> http://elinux.org/GPIO >> >> The kernel on the e100 already supports the sysfs entries for gpio's. >> (UHD uses it) >> >> Philip >> >>> >>> >>> >>> Regards, >>> S. Yassin >>> >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
