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gateware.spi: rework wb bus sequence

This commit is contained in:
Robert Jördens 2016-02-29 22:22:08 +01:00
parent 12252abc8f
commit da22ec73df
1 changed files with 12 additions and 11 deletions
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21
artiq/gateware/spi.py
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@ -292,14 +292,12 @@ class SPIMaster(Module):
data_width, clock_width=len(config.div_read),
bits_width=len(xfer.read_length))
wb_we = Signal()
pending = Signal()
cs = Signal.like(xfer.cs)
data_read = Signal.like(spi.reg.data)
data_write = Signal.like(spi.reg.data)
self.comb += [
wb_we.eq(bus.cyc & bus.stb & bus.we & (~pending | spi.done)),
bus.dat_r.eq(
Array([data_read, xfer.raw_bits(), config.raw_bits()
])[bus.adr]),
@ -310,13 +308,6 @@ class SPIMaster(Module):
spi.div_read.eq(config.div_read),
]
self.sync += [
bus.ack.eq(bus.cyc & bus.stb & (~bus.we | ~pending | spi.done)),
If(wb_we,
Array([data_write, xfer.raw_bits(), config.raw_bits()
])[bus.adr].eq(bus.dat_w)
),
config.active.eq(spi.cs),
config.pending.eq(pending),
If(spi.done,
data_read.eq(spi.reg.data),
),
@ -327,9 +318,19 @@ class SPIMaster(Module):
spi.reg.data.eq(data_write),
pending.eq(0),
),
If(wb_we & (bus.adr == 0), # data register
bus.ack.eq(bus.cyc & bus.stb & (~bus.we | ~pending | spi.done)),
If(bus.ack,
bus.ack.eq(0),
),
If(bus.we & bus.ack,
Array([data_write, xfer.raw_bits(), config.raw_bits()
])[bus.adr].eq(bus.dat_w),
If(bus.adr == 0, # data register
pending.eq(1),
),
),
config.active.eq(spi.cs),
config.pending.eq(pending),
]
# I/O