diff options
| -rw-r--r-- | mpm/python/usrp_mpm/dboard_manager/magnesium.py | 80 |
1 files changed, 77 insertions, 3 deletions
diff --git a/mpm/python/usrp_mpm/dboard_manager/magnesium.py b/mpm/python/usrp_mpm/dboard_manager/magnesium.py index aba810288..1b87368da 100644 --- a/mpm/python/usrp_mpm/dboard_manager/magnesium.py +++ b/mpm/python/usrp_mpm/dboard_manager/magnesium.py @@ -19,6 +19,7 @@ magnesium dboard implementation module """ from __future__ import print_function +import os import struct import time from six import iteritems @@ -29,7 +30,7 @@ from ..uio import UIO from ..mpmlog import get_logger from .lmk_mg import LMK04828Mg from usrp_mpm.cores import ClockSynchronizer - +from ..sysfs_gpio import SysFSGPIO def create_spidev_iface(dev_node): """ Create a regs iface from a spidev node @@ -84,6 +85,46 @@ def create_spidev_iface_phasedac(dev_node): 0, # Write flag ) +class TCA6408(object): + """ + Abstraction layer for the port/gpio expander + """ + pins = ( + 'PWR-GOOD-3.6V', #3.6V + 'PWR-EN-3.6V', #3.6V + 'PWR-GOOD-1.5V', #1.5V + 'PWR-EN-1.5V', #1.5V + 'PWR-GOOD-5.5V', #5.5V + 'PWR-EN-5.5V', #5.5V + '6', + 'LED', + ) + + def __init__(self, i2c_dev): + if i2c_dev is None: + raise RuntimeError("Need to specify i2c device to use the TCA6408") + self._gpios = SysFSGPIO('tca6408', 0xBF, 0xAA, 0xAA, i2c_dev) + + def set(self, name, value=None): + """ + Assert a pin by name + """ + assert name in self.pins + self._gpios.set(self.pins.index(name), value=value) + + def reset(self, name): + """ + Deassert a pin by name + """ + self.set(name, value=0) + + def get(self, name): + """ + Read back a pin by name + """ + assert name in self.pins + return self._gpios.get(self.pins.index(name)) + class Magnesium(DboardManagerBase): """ Holds all dboard specific information and methods of the magnesium dboard @@ -94,7 +135,8 @@ class Magnesium(DboardManagerBase): # See DboardManagerBase for documentation on these fields ######################################################################### pids = [0x150] - + #file system path to i2c-adapter/mux + base_i2c_adapter = '/sys/class/i2c-adapter' # Maps the chipselects to the corresponding devices: spi_chipselect = {"cpld": 0, "lmk": 1, "mykonos": 2, "phase_dac": 3} @staticmethod @@ -118,6 +160,8 @@ class Magnesium(DboardManagerBase): "mykonos": create_spidev_iface, "phase_dac": create_spidev_iface_phasedac, } + # Map I2C channel to slot index + i2c_chan_map = {0: 'i2c-9', 1: 'i2c-10'} # DAC is initialized to midscale automatically on power-on: 16-bit DAC, so midpoint # is at 2^15 = 32768. However, the linearity of the DAC is best just below that @@ -131,13 +175,43 @@ class Magnesium(DboardManagerBase): func.__doc__ = mykfunc.__doc__ return func + def _get_i2c_dev(self): + " Return the I2C path for this daughterboard " + import pyudev + context = pyudev.Context() + i2c_dev_path = os.path.join( + self.base_i2c_adapter, + self.i2c_chan_map[self.slot_idx] + ) + return pyudev.Devices.from_sys_path(context, i2c_dev_path) + + def _power_on(self): + " Turn on power to daughterboard " + self.log.trace("Powering on slot_idx={}...".format(self.slot_idx)) + i2c_dev = self._get_i2c_dev() + self._port_expander = TCA6408(i2c_dev) + self._port_expander.set("PWR-EN-3.6V") + self._port_expander.set("PWR-EN-1.5V") + self._port_expander.set("PWR-EN-5.5V") + self._port_expander.set("LED") + + def _power_off(self): + " Turn off power to daughterboard " + self.log.trace("Powering off slot_idx={}...".format(self.slot_idx)) + i2c_dev = self._get_i2c_dev() + self._port_expander = TCA6408(i2c_dev) + self._port_expander.reset("PWR-EN-3.6V") + self._port_expander.reset("PWR-EN-1.5V") + self._port_expander.reset("PWR-EN-5.5V") + self._port_expander.reset("LED") + def __init__(self, slot_idx, **kwargs): super(Magnesium, self).__init__(slot_idx, **kwargs) self.log = get_logger("Magnesium-{}".format(slot_idx)) self.log.trace("Initializing Magnesium daughterboard, slot index {}".format(self.slot_idx)) self.ref_clock_freq = 10e6 # TODO: make this not fixed - + self._power_on() self.log.debug("Loading C++ drivers...") self._device = lib.dboards.magnesium_manager( self._spi_nodes['mykonos'], |