diff options
| author | djepson1 <daniel.jepson@ni.com> | 2017-06-29 10:58:50 -0500 |
|---|---|---|
| committer | Martin Braun <martin.braun@ettus.com> | 2017-12-22 15:04:00 -0800 |
| commit | d15b55481db6c2704a78f6677fc1ca99f4681bfb (patch) | |
| tree | 76a0e2c3acb4662e328b580781212d5acca01e72 /mpm | |
| parent | ba11bf2d699957e9a5d9b587de045162d2fce3e3 (diff) | |
| download | uhd-d15b55481db6c2704a78f6677fc1ca99f4681bfb.tar.gz uhd-d15b55481db6c2704a78f6677fc1ca99f4681bfb.tar.bz2 uhd-d15b55481db6c2704a78f6677fc1ca99f4681bfb.zip | |
eiscat: Fixing a sequencing issue with channel enables for signal integrity reasons
Diffstat (limited to 'mpm')
| -rw-r--r-- | mpm/python/usrp_mpm/dboard_manager/eiscat.py | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/mpm/python/usrp_mpm/dboard_manager/eiscat.py b/mpm/python/usrp_mpm/dboard_manager/eiscat.py index 7580da3b0..cc0dddaaf 100644 --- a/mpm/python/usrp_mpm/dboard_manager/eiscat.py +++ b/mpm/python/usrp_mpm/dboard_manager/eiscat.py @@ -514,12 +514,6 @@ class EISCAT(DboardManagerBase): self.log.info("Radio-register UIO object successfully generated!") self._spi_ifaces = _init_spi_devices() # Chips don't have power yet! self.log.info("Loaded SPI interfaces!") - # We toggle power in order to hard-reset the ADCs. This has proven - # necessary to avoid failures of JESD204B link bringups, even though - # it's not lined out in the data sheets. If power was never on, this'll - # just delay initialization a little. - self._deinit_power(self.radio_regs) - time.sleep(.100) # This time is arbitrarily assigned and seems to work well. self._init_power(self.radio_regs) # Now, we can talk to chips via SPI self.dboard_clk_control = _init_clock_control(self.radio_regs) self.lmk = _init_lmk( @@ -653,20 +647,23 @@ class EISCAT(DboardManagerBase): After this function, we should never touch this group again (other than turning it off, maybe). """ + # Enable all channels first due to a signal integrity issue when enabling them + # after the LNA enable is asserted. + self.log.trace("Enabling power to the daughterboard...") + regs.poke32(self.DB_CH_ENABLES, 0x000000FF) regs.poke32(self.DB_ENABLES, 0x01000000) regs.poke32(self.DB_ENABLES, 0x00010101) regs.poke32(self.ADC_CONTROL, 0x00010000) time.sleep(0.100) - regs.poke32(self.DB_CH_ENABLES, 0x000000FF) # Enable all channels def _deinit_power(self, regs): """ Turn off power to the dboard. Sequence is reverse of init_power. """ self.log.trace("Disabling power to the daughterboard...") - regs.poke32(self.DB_CH_ENABLES, 0x00000000) # Disable all channels regs.poke32(self.ADC_CONTROL, 0x00100000) regs.poke32(self.DB_ENABLES, 0x10101010) + regs.poke32(self.DB_CH_ENABLES, 0x00000000) # Disable all channels (last) def update_ref_clock_freq(self, freq): """ |