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coredevice/shiftreg: add get method

This commit is contained in:
Sebastien Bourdeauducq 2019-12-20 18:58:50 +08:00
parent c8b8f7a4be
commit 59e8b77fca
1 changed files with 18 additions and 1 deletions
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19
artiq/coredevice/shiftreg.py
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@ -6,13 +6,15 @@ class ShiftReg:
"""Driver for shift registers/latch combos connected to TTLs"""
kernel_invariants = {"dt", "n"}
def __init__(self, dmgr, clk, ser, latch, n=32, dt=10*us):
def __init__(self, dmgr, clk, ser, latch, n=32, dt=10*us, ser_in=None):
self.core = dmgr.get("core")
self.clk = dmgr.get(clk)
self.ser = dmgr.get(ser)
self.latch = dmgr.get(latch)
self.n = n
self.dt = dt
if ser_in is not None:
self.ser_in = dmgr.get(ser_in)
@kernel
def set(self, data):
@ -34,3 +36,18 @@ class ShiftReg:
delay(self.dt)
self.latch.off()
delay(self.dt)
@kernel
def get(self):
delay(-2*(self.n + 1)*self.dt)
data = 0
for i in range(self.n):
data <<= 1
if self.ser_in.sample_input():
data |= 1
delay(self.dt)
self.clk.on()
delay(self.dt)
self.clk.off()
delay(self.dt)
return data