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#
# Copyright 2017 Ettus Research (National Instruments)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
LMK04828 parent driver class
"""
from builtins import object
from ..mpmlog import get_logger
class LMK04828(object):
"""
Generic driver class for LMK04828 access.
"""
LMK_CHIP_ID = 6
def __init__(self, regs_iface, postfix=None):
postfix = postfix or ""
self.log = get_logger("LMK04828-{}".format(postfix))
self.regs_iface = regs_iface
assert hasattr(self.regs_iface, 'peek8')
assert hasattr(self.regs_iface, 'poke8')
self.poke8 = regs_iface.poke8
self.peek8 = regs_iface.peek8
def pokes8(self, addr_vals):
"""
Apply a series of pokes.
pokes8((0,1),(0,2)) is the same as calling poke8(0,1), poke8(0,2).
"""
for addr, val in addr_vals:
self.poke8(addr, val)
def get_chip_id(self):
"""
Read back the chip ID
"""
chip_id = self.peek8(0x03)
self.log.trace("Read chip ID: {}".format(chip_id))
return chip_id
def verify_chip_id(self):
"""
Returns True if the chip ID matches what we expect, False otherwise.
"""
chip_id = self.get_chip_id()
if chip_id != self.LMK_CHIP_ID:
self.log.error("Wrong chip id 0x{:X}".format(chip_id))
return False
return True
def check_plls_locked(self):
"""
Checks both PLLs are locked. Will throw an exception otherwise.
Returns True if both PLLs are locked, False otherwise.
"""
self.log.trace("Checking PLL lock bits...")
def check_pll_lock(pll_id, addr):
"""
pll_id -- A string defining the PLL (e.g. 'PLL1')
addr -- The address to peek to see if it's locked
"""
pll_lock_status = self.regs_iface.peek8(addr)
if (pll_lock_status & 0x7) != 0x02:
self.log.error("LMK {} did not lock. Status: {:x}".format(pll_id, pll_lock_status))
return False
return True
lock_status = \
check_pll_lock("PLL1", 0x182) and \
check_pll_lock("PLL2", 0x183)
return lock_status
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