print hello world on UART
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b2bcbd7048
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@ -20,13 +20,24 @@ class Top:
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m.submodules.clock = Instance("IBUFGDS",
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i_I=self.clk156_p, i_IB=self.clk156_n, o_O=cd_sync.clk)
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string = "Hello World!\r\n"
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mem = Memory(width=8, depth=len(string),
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init=[ord(c) for c in string])
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m.submodules.rdport = rdport = mem.read_port(synchronous=False)
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tx = uart.RS232TX(round(2**32*self.baudrate/self.clk_freq))
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m.submodules.tx = tx
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m.d.comb += [
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tx.stb.eq(1),
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tx.data.eq(ord("A")),
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tx.data.eq(rdport.data),
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self.serial_tx.eq(tx.tx)
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]
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with m.If(tx.ack):
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with m.If(rdport.addr == len(string) - 1):
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m.d.sync += rdport.addr.eq(0)
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with m.Else():
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m.d.sync += rdport.addr.eq(rdport.addr + 1)
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return m
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