Hi,
I have written a c code for GPIO toggling in USRP B205mini-i board.
The pin should be high for 1microseconds and low for 1milliseconds. I
have given the c code to verify whether it is correct or not?

  while(1)
  {
      uhd_usrp_get_time_now(usrp, mboard, &full_secs, &frac_secs);
      uhd_usrp_set_command_time(usrp, full_secs , frac_secs + 1e-6,

mboard);

mboard);
uhd_usrp_clear_command_time(usrp, 0);
uhd_usrp_get_time_now(usrp, mboard, &full_secs, &frac_secs);
uhd_usrp_set_command_time(usrp, full_secs , frac_secs + 1e-3,
mboard);

      error = uhd_usrp_set_gpio_attr(usrp, bank, "OUT", 0x00, mask1,

mboard);
uhd_usrp_clear_command_time(usrp, 0);
}

On Mon, Feb 24, 2025 at 10:42 AM kavinraj@atindriya.co.in wrote:

Hi,
I have written a c code for GPIO toggling in USRP B205mini-i
board.
The pin should be high for 1microseconds and low for 1milliseconds.
I
have given the c code to verify whether it is correct or not?

while(1)
{
uhd_usrp_get_time_now(usrp, mboard, &full_secs,
&frac_secs);
uhd_usrp_set_command_time(usrp, full_secs , frac_secs +
1e-6,
mboard);

This won't work, you need to set this in the future from "time now".

error = uhd_usrp_set_gpio_attr(usrp, bank, "OUT", 0x01,
mask1,
mboard);
uhd_usrp_clear_command_time(usrp, 0);
uhd_usrp_get_time_now(usrp, mboard, &full_secs,
&frac_secs);
uhd_usrp_set_command_time(usrp, full_secs , frac_secs +
1e-3,
mboard);

Same here.

error = uhd_usrp_set_gpio_attr(usrp, bank, "OUT", 0x00,
mask1,
mboard);
uhd_usrp_clear_command_time(usrp, 0);
}

Get the time "now" outside of the loop, and use that as a base
reference. When you've fixed that, I recommend you connect it to an
oscilloscope for verification.

--M

USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com