From 4042a319fd29bd5be7b28ce7d3383a2eccaeb7b8 Mon Sep 17 00:00:00 2001 From: Michael West Date: Mon, 7 Oct 2019 16:41:15 -0700 Subject: N3xx: Remove close-in noise on TX Some close-in noise was observed on TX when using external references. This change reduces the noise by changing U19 to select the GPSDO when references are set to external. Also included is a change to properly read and apply settings from the configuration file. This allows the user to further quiet the transmission by adding 'enable_gps=False' to the configuration file in order to power off the GPSDO. Signed-off-by: Michael West --- mpm/python/usrp_mpm/periph_manager/n3xx.py | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'mpm/python/usrp_mpm') diff --git a/mpm/python/usrp_mpm/periph_manager/n3xx.py b/mpm/python/usrp_mpm/periph_manager/n3xx.py index cdc58b8cc..2695dbfba 100644 --- a/mpm/python/usrp_mpm/periph_manager/n3xx.py +++ b/mpm/python/usrp_mpm/periph_manager/n3xx.py @@ -225,6 +225,7 @@ class n3xx(ZynqComponents, PeriphManagerBase): # Init peripherals # these peripherals are specific to mboard and # need to configured before applying fpga overlay + args = self._update_default_args(args) self._gpios = TCA6424(int(self.mboard_info['rev'])) self.log.trace("Enabling power of MGT156MHZ clk") self._gpios.set("PWREN-CLK-MGT156MHz") @@ -669,9 +670,9 @@ class n3xx(ZynqComponents, PeriphManagerBase): self._gpios.set("CLK-MAINSEL-GPS") else: # external self._gpios.reset("CLK-MAINSEL-EX_B") - self._gpios.reset("CLK-MAINSEL-GPS") + self._gpios.set("CLK-MAINSEL-GPS") # SKY13350 needs to be in known state - self._gpios.set("CLK-MAINSEL-25MHz") + self._gpios.reset("CLK-MAINSEL-25MHz") self._clock_source = clock_source self.log.debug("Reference clock source is: {}" \ .format(self._clock_source)) -- cgit v1.2.3