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basemod: add coredevice driver

This commit is contained in:
Sebastien Bourdeauducq 2019-12-21 14:18:10 +08:00
parent 106d25b32a
commit d4e039cede
1 changed files with 45 additions and 0 deletions

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from artiq.language.core import kernel, delay
from artiq.language.units import us, ms
from artiq.coredevice.shiftreg import ShiftReg
class BaseModAtt:
def __init__(self, dmgr, rst_n, clk, le, mosi, miso):
self.rst_n = dmgr.get(rst_n)
self.shift_reg = ShiftReg(dmgr,
clk=clk, ser=mosi, latch=le, ser_in=miso, n=8*4)
@kernel
def reset(self):
# HMC's incompetence in digital design an interfaces means that
# the HMC542 needs a level low on RST_N and then a rising edge
# on Latch Enable. Their "latch" isn't a latch but a DFF.
# Of course, it also powers up with a random attenuation, and
# that cannot be fixed with simple pull-ups/pull-downs.
self.rst_n.off()
self.shift_reg.latch.off()
delay(1*us)
self.shift_reg.latch.on()
delay(1*us)
self.shift_reg.latch.off()
self.rst_n.on()
delay(1*us)
@kernel
def set_mu(self, att0, att1, att2, att3):
word = (
(att0 << 2) |
(att1 << 10) |
(att2 << 18) |
(att3 << 26)
)
self.shift_reg.set(word)
@kernel
def get_mu(self):
word = self.shift_reg.get()
att0 = (word >> 2) & 0x3f
att1 = (word >> 10) & 0x3f
att2 = (word >> 18) & 0x3f
att3 = (word >> 26) & 0x3f
return att0, att1, att2, att3