Mix format charlists

Author: fhunleth

lib/uart/enumerator.ex

@@ -2,7 +2,7 @@ defmodule Circuits.UART.Enumerator do
   @moduledoc false
 
   def enumerate() do
-    executable = :code.priv_dir(:circuits_uart) ++ '/circuits_uart'
+    executable = :code.priv_dir(:circuits_uart) ++ ~c"/circuits_uart"
 
     port =
       Port.open({:spawn_executable, executable}, [

test/basic_uart_test.exs

@@ -58,10 +58,10 @@ defmodule BasicUARTTest do
     assert :ok = UART.open(uart1, UARTTest.port1(), active: false)
     assert :ok = UART.open(uart2, UARTTest.port2(), active: false)
 
-    assert :ok = UART.write(uart1, 'B')
+    assert :ok = UART.write(uart1, ~c"B")
     assert {:ok, "B"} = UART.read(uart2)
 
-    assert :ok = UART.write(uart1, ['AB', ?C, 'D', "EFG"])
+    assert :ok = UART.write(uart1, [~c"AB", ?C, ~c"D", "EFG"])
 
     # Wait for everything to be received in one call
     :timer.sleep(100)