3 wrap existing clashcores uart transmit in packetstream protocol :)

clash-eth.cabal

@@ -87,6 +87,7 @@ library
     Clash.Cores.Ethernet.RGMII
     Clash.Cores.Ethernet.PacketStream
     Clash.Lattice.ECP5.Prims
+    Clash.Lattice.ECP5.UART
     Clash.Lattice.ECP5.Colorlight.CRG
   default-language: Haskell2010
   build-depends:

src/Clash/Lattice/ECP5/UART.hs

@@ -0,0 +1,31 @@
+{-#language FlexibleContexts #-}
+
+module Clash.Lattice.ECP5.UART
+    (uartTxC) where
+
+import Data.Maybe
+
+import Clash.Prelude
+import Clash.Cores.Ethernet.PacketStream
+import Clash.Cores.UART
+import Protocols
+import Protocols.Internal
+
+
+convertToTx :: Signal dom (Maybe (PacketStreamM2S 1 ())) -> Signal dom (Maybe (BitVector 8))
+convertToTx = fmap $ fmap $ (head . _data)
+
+uartTxC
+  :: forall (dom :: Domain)
+            (baud :: Nat)
+   . HiddenClockResetEnable dom
+  => ValidBaud dom baud
+  => SNat baud
+  -- ^ The UART baud
+  -> Circuit (PacketStream dom 1 ()) (CSignal dom Bit)
+  -- ^ This component receives a PacketStream and converts it to the UART transmitter input while relaying backpressure from the UART
+uartTxC baud = fromSignals ckt
+  where
+    ckt (fwd, _) =  (PacketStreamS2M <$> ack, CSignal txBit)
+      where
+        (txBit, ack) = uartTx baud (convertToTx fwd)