mirror of https://github.com/m-labs/artiq.git
rtio/dma: fix endianness
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c6ba0f3cf4
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@ -11,6 +11,26 @@ def _reverse_bytes(s, g):
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return Cat(reversed(list(s[i*g:(i+1)*g] for i in range(len(s)//g))))
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def reverse_bytes(s):
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n = (len(s) + 7)//8
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return Cat(*[s[i*8:min((i + 1)*8, len(s))]
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for i in reversed(range(n))])
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def convert_signal(signal):
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assert len(signal) % 8 == 0
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nbytes = len(signal)//8
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assert nbytes % 4 == 0
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nwords = nbytes//4
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signal_words = []
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for i in range(nwords):
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signal_bytes = []
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for j in range(4):
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signal_bytes.append(signal[8*(j+i*4):8*((j+i*4)+1)])
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signal_words.extend(reversed(signal_bytes))
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return Cat(*signal_words)
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class WishboneReader(Module):
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def __init__(self, bus):
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self.bus = bus
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@ -37,7 +57,7 @@ class WishboneReader(Module):
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If(self.source.ack, data_reg_loaded.eq(0)),
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If(bus.ack,
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data_reg_loaded.eq(1),
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self.source.data.eq(bus.dat_r),
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self.source.data.eq(convert_signal(bus.dat_r)),
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self.source.eop.eq(self.sink.eop)
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)
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]
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