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doc: document core device driver. Closes #119

This commit is contained in:
Sebastien Bourdeauducq 2015-10-06 18:12:57 +08:00
parent 3cf53667c8
commit 5f89d1a78f
2 changed files with 24 additions and 3 deletions

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@ -46,10 +46,22 @@ def _no_debug_unparse(label, node):
class Core:
def __init__(self, dmgr, ref_period=8*ns, external_clock=False):
self.comm = dmgr.get("comm")
"""Core device driver.
:param ref_period: period of the reference clock for the RTIO subsystem.
On platforms that use clock multiplication and SERDES-based PHYs,
this is the period after multiplication. For example, with a RTIO core
clocked at 125MHz and a SERDES multiplication factor of 8, the
reference period is 1ns.
The time machine unit is equal to this period.
:param external_clock: whether the core device should switch to its
external RTIO clock input instead of using its internal oscillator.
:param comm_device: name of the device used for communications.
"""
def __init__(self, dmgr, ref_period=8*ns, external_clock=False, comm_device="comm"):
self.ref_period = ref_period
self.external_clock = external_clock
self.comm = dmgr.get(comm_device)
self.first_run = True
self.core = self
@ -120,10 +132,13 @@ class Core:
@kernel
def get_rtio_counter_mu(self):
"""Return the current value of the hardware RTIO counter."""
return syscall("rtio_get_counter")
@kernel
def break_realtime(self):
"""Set the timeline to the current value of the hardware RTIO counter
plus a margin of 125000 machine units."""
min_now = syscall("rtio_get_counter") + 125000
if now_mu() < min_now:
at_mu(min_now)

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@ -1,7 +1,13 @@
Core drivers reference
======================
These drivers are for peripherals closely integrated into the core device, which do not use the controller mechanism.
These drivers are for the core device and the peripherals closely integrated into it, which do not use the controller mechanism.
:mod:`artiq.coredevice.core` module
-----------------------------------
.. automodule:: artiq.coredevice.core
:members:
:mod:`artiq.coredevice.ttl` module
-----------------------------------