lambdasoc/test/_wishbone.py

   1 def wb_read(bus, addr, sel, timeout=32):
   2     yield bus.cyc.eq(1)
   3     yield bus.stb.eq(1)
   4     yield bus.adr.eq(addr)
   5     yield bus.sel.eq(sel)
   6     yield
   7     cycles = 0
   8     while not (yield bus.ack):
   9         yield
  10         if cycles >= timeout:
  11             raise RuntimeError("Wishbone transaction timed out")
  12         cycles += 1
  13     data = (yield bus.dat_r)
  14     yield bus.cyc.eq(0)
  15     yield bus.stb.eq(0)
  16     return data
  17
  18 def wb_write(bus, addr, data, sel, timeout=32):
  19     yield bus.cyc.eq(1)
  20     yield bus.stb.eq(1)
  21     yield bus.adr.eq(addr)
  22     yield bus.we.eq(1)
  23     yield bus.sel.eq(sel)
  24     yield bus.dat_w.eq(data)
  25     yield
  26     cycles = 0
  27     while not (yield bus.ack):
  28         yield
  29         if cycles >= timeout:
  30             raise RuntimeError("Wishbone transaction timed out")
  31         cycles += 1
  32     yield bus.cyc.eq(0)
  33     yield bus.stb.eq(0)
  34     yield bus.we.eq(0)