from artiq.language.core import kernel, delay
from artiq.language.units import us
[docs]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, 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)
[docs] @kernel
def set(self, data):
"""Sets the values of the latch outputs. This does not
advance the timeline and the waveform is generated before
`now`."""
delay(-2*(self.n + 1)*self.dt)
for i in range(self.n):
if (data >> (self.n-i-1)) & 1 == 0:
self.ser.off()
else:
self.ser.on()
self.clk.off()
delay(self.dt)
self.clk.on()
delay(self.dt)
self.clk.off()
self.latch.on()
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
self.ser_in.sample_input()
if self.ser_in.sample_get():
data |= 1
delay(self.dt)
self.clk.on()
delay(self.dt)
self.clk.off()
delay(self.dt)
return data