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pdq2: use 16 bit data, buffered read_mem()

This commit is contained in:
Robert Jördens 2017-04-13 20:49:46 +02:00
parent 90cf11994e
commit 534e681d0b
1 changed files with 17 additions and 14 deletions
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31
artiq/coredevice/pdq2.py
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@ -100,29 +100,32 @@ class PDQ2:
((adr & 0x00ff) << 16) | (adr & 0xff00))
delay_mu(-self.bus.write_period_mu-3*self.bus.ref_period_mu)
self.bus.set_xfer(self.chip_select, 16, 0)
for i in range(len(data)//2):
self.bus.write((data[2*i] << 24) | (data[2*i + 1] << 16))
for i in data:
self.bus.write(i << 16)
delay_mu(-self.bus.write_period_mu)
delay_mu(self.bus.write_period_mu + self.bus.ref_period_mu)
# get to 20ns min cs high
@kernel
def read_mem(self, mem, adr, data, board=0xf):
def read_mem(self, mem, adr, data, board=0xf, buffer=8):
n = len(data)
if not n:
return
self.bus.set_xfer(self.chip_select, 24, 8)
self.bus.write((_PDQ2_CMD(board, 1, mem, 0) << 24) |
((adr & 0x00ff) << 16) | (adr & 0xff00))
delay_mu(-self.bus.write_period_mu-3*self.bus.ref_period_mu)
self.bus.set_xfer(self.chip_select, 0, 16)
for i in range(len(data)//2):
for i in range(n):
self.bus.write(0)
delay_mu(-self.bus.write_period_mu-3*self.bus.ref_period_mu)
self.bus.read_async()
d = self.bus.input_async()
data[2*i] = (d >> 8) & 0xff
data[2*i + 1] = d & 0xff
return int(self.bus.input_async() & 0xff) # FIXME: m-labs/artiq#713
delay_mu(self.bus.write_period_mu + self.bus.ref_period_mu)
# get to 20ns min cs high
delay_mu(-self.bus.write_period_mu)
if i > 0:
delay_mu(-3*self.bus.ref_period_mu)
self.bus.read_async()
if i > buffer:
data[i - 1 - buffer] = self.bus.input_async() & 0xffff
delay_mu(self.bus.write_period_mu)
self.bus.set_xfer(self.chip_select, 16, 0)
pass
self.bus.read_async()
for i in range(max(0, n - buffer - 1), n):
data[i] = self.bus.input_async() & 0xffff