print hello world on UART

pull/1/head
parent b2bcbd7048
commit ca0707fa88
  1. 0
      examples/helloworld.nix
  2. 13
      examples/helloworld.py

@ -20,13 +20,24 @@ class Top:
m.submodules.clock = Instance("IBUFGDS",
i_I=self.clk156_p, i_IB=self.clk156_n, o_O=cd_sync.clk)
string = "Hello World!\r\n"
mem = Memory(width=8, depth=len(string),
init=[ord(c) for c in string])
m.submodules.rdport = rdport = mem.read_port(synchronous=False)
tx = uart.RS232TX(round(2**32*self.baudrate/self.clk_freq))
m.submodules.tx = tx
m.d.comb += [
tx.stb.eq(1),
tx.data.eq(ord("A")),
tx.data.eq(rdport.data),
self.serial_tx.eq(tx.tx)
]
with m.If(tx.ack):
with m.If(rdport.addr == len(string) - 1):
m.d.sync += rdport.addr.eq(0)
with m.Else():
m.d.sync += rdport.addr.eq(rdport.addr + 1)
return m
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