migrate from Travis to GHA and rework examples (#78)

* migrate from Travis to GHA

* rework examples

1 files changed, 0 insertions, 66 deletions

diff --git a/icestick/uart/hdl/uart_rx.vhd b/icestick/uart/hdl/uart_rx.vhd
deleted file mode 100755
index 5f488cc..0000000
--- a/icestick/uart/hdl/uart_rx.vhd
+++ /dev/null
@@ -1,66 +0,0 @@
-library ieee;
-  use ieee.std_logic_1164.all;
-
-entity uart_rx is
-  generic (
-    C_BITS           : integer := 8;
-    C_CYCLES_PER_BIT : integer := 104
-  );
-  port (
-    isl_clk    : in std_logic;
-    isl_data_n : in std_logic;
-    oslv_data  : out std_logic_vector(C_BITS-1 downto 0);
-    osl_valid  : out std_logic
-  );
-end entity uart_rx;
-
-architecture rtl of uart_rx is
-  signal int_cycle_cnt : integer range 0 to C_CYCLES_PER_BIT-1 := 0;
-  signal int_bit_cnt : integer range 0 to C_BITS+1 := 0;
-
-  signal slv_data : std_logic_vector(C_BITS-1 downto 0) := (others => '0');
-  signal sl_valid : std_logic := '0';
-
-  type t_state is (IDLE, INIT, RECEIVE);
-  signal state : t_state;
-
-begin
-  process(isl_clk)
-  begin
-    if rising_edge(isl_clk) then
-      case state is
-        when IDLE =>
-          sl_valid <= '0';
-          if isl_data_n = '0' then
-            -- wait for the start bit
-            state <= INIT;
-          end if;
-        
-        when INIT =>
-          int_cycle_cnt <= C_CYCLES_PER_BIT / 2;
-          int_bit_cnt <= 0;
-          state <= RECEIVE;
-
-        when RECEIVE =>
-          if int_bit_cnt < C_BITS+1 then
-            if int_cycle_cnt < C_CYCLES_PER_BIT-1 then
-              int_cycle_cnt <= int_cycle_cnt+1;
-            else
-              -- receive data bits
-              int_cycle_cnt <= 0;
-              int_bit_cnt <= int_bit_cnt+1;
-              slv_data <= not isl_data_n & slv_data(slv_data'LEFT downto 1); -- low active
-            end if;
-          elsif isl_data_n = '1' then
-            -- wait for the stop bit
-            sl_valid <= '1';
-            state <= IDLE;
-          end if;
-
-      end case;
-    end if;
-  end process;
-
-  oslv_data <= slv_data;
-  osl_valid <= sl_valid;
-end architecture rtl;