From 1530f8cecf08becb9dfc93a79371c4c77a8d4c0d Mon Sep 17 00:00:00 2001
From: Alex Forencich <alex@alexforencich.com>
Date: Fri, 27 Feb 2026 17:11:30 -0800
Subject: [PATCH] axis: Use SV enums in AXI stream components

Signed-off-by: Alex Forencich <alex@alexforencich.com>
---
 src/axis/rtl/taxi_axis_cobs_decode.sv | 11 ++++++-----
 src/axis/rtl/taxi_axis_cobs_encode.sv | 22 ++++++++++++----------
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/src/axis/rtl/taxi_axis_cobs_decode.sv b/src/axis/rtl/taxi_axis_cobs_decode.sv
index c752055..251b043 100644
--- a/src/axis/rtl/taxi_axis_cobs_decode.sv
+++ b/src/axis/rtl/taxi_axis_cobs_decode.sv
@@ -36,12 +36,13 @@ if (m_axis.DATA_W != 8 || s_axis.DATA_W != 8)
     $fatal(0, "Error: Interface DATA_W parameter mismatch (instance %m)");
 
 // state register
-localparam [1:0]
-    STATE_IDLE = 2'd0,
-    STATE_SEGMENT = 2'd1,
-    STATE_NEXT_SEGMENT = 2'd2;
+typedef enum logic [1:0] {
+    STATE_IDLE,
+    STATE_SEGMENT,
+    STATE_NEXT_SEGMENT
+} state_t;
 
-logic [1:0] state_reg = STATE_IDLE, state_next;
+state_t state_reg = STATE_IDLE, state_next;
 
 logic [7:0] count_reg = 8'd0, count_next;
 logic suppress_zero_reg = 1'b0, suppress_zero_next;
diff --git a/src/axis/rtl/taxi_axis_cobs_encode.sv b/src/axis/rtl/taxi_axis_cobs_encode.sv
index f425b1a..cb033e6 100644
--- a/src/axis/rtl/taxi_axis_cobs_encode.sv
+++ b/src/axis/rtl/taxi_axis_cobs_encode.sv
@@ -40,19 +40,21 @@ if (m_axis.DATA_W != 8 || s_axis.DATA_W != 8)
     $fatal(0, "Error: Interface DATA_W parameter mismatch (instance %m)");
 
 // state register
-localparam [1:0]
-    INPUT_STATE_IDLE = 2'd0,
-    INPUT_STATE_SEGMENT = 2'd1,
-    INPUT_STATE_FINAL_ZERO = 2'd2,
-    INPUT_STATE_APPEND_ZERO = 2'd3;
+typedef enum logic [1:0] {
+    INPUT_STATE_IDLE,
+    INPUT_STATE_SEGMENT,
+    INPUT_STATE_FINAL_ZERO,
+    INPUT_STATE_APPEND_ZERO
+} input_state_t;
 
-logic [1:0] input_state_reg = INPUT_STATE_IDLE, input_state_next;
+input_state_t input_state_reg = INPUT_STATE_IDLE, input_state_next;
 
-localparam [0:0]
-    OUTPUT_STATE_IDLE = 1'd0,
-    OUTPUT_STATE_SEGMENT = 1'd1;
+typedef enum logic [0:0] {
+    OUTPUT_STATE_IDLE,
+    OUTPUT_STATE_SEGMENT
+} output_state_t;
 
-logic [0:0] output_state_reg = OUTPUT_STATE_IDLE, output_state_next;
+output_state_t output_state_reg = OUTPUT_STATE_IDLE, output_state_next;
 
 logic [7:0] input_count_reg = 8'd0, input_count_next;
 logic [7:0] output_count_reg = 8'd0, output_count_next;