Transmit two stop bits to RS232 uart.

1 files changed, 8 insertions, 2 deletions

diff --git a/hdl/rs232.sv b/hdl/rs232.sv
index 03378ef..41403a6 100644
--- a/hdl/rs232.sv
+++ b/hdl/rs232.sv
@@ -17,7 +17,8 @@ module rs232_tx
     (* syn_encoding = "one-hot" *) enum int unsigned
         {   START
         ,   DATA
-        ,   STOP
+        ,   STOP1
+        ,   STOP2
         } state;
 
     bit [$clog2(`UART_BYTE_BITS):0] data_bits;
@@ -53,7 +54,12 @@ module rs232_tx
                             ++data_bits;
                     end
 
-                    STOP: begin
+                    STOP1: begin
+                        tx = 1;
+                        state = state.next;
+                    end
+
+                    STOP2: begin
                         hold_valid = 0;
                         tx = 1;
                         state = state.next;