From b7bf1d9835b0fab2da581df8d81686509d155e15 Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Sat, 22 Nov 2025 01:03:37 +0700
Subject: [PATCH] hil stress test cdc

---
 src/common/tusb_fifo.c |  4 +--
 test/hil/hil_test.py   | 63 +++++++++++++++++++++++++++---------------
 2 files changed, 43 insertions(+), 24 deletions(-)

diff --git a/src/common/tusb_fifo.c b/src/common/tusb_fifo.c
index 463a059f0..f09fcbafa 100644
--- a/src/common/tusb_fifo.c
+++ b/src/common/tusb_fifo.c
@@ -38,13 +38,13 @@
 
 #if OSAL_MUTEX_REQUIRED
 
-TU_ATTR_ALWAYS_INLINE static inline void _ff_lock(osal_mutex_t mutex) {
+TU_ATTR_ALWAYS_INLINE static inline void ff_lock(osal_mutex_t mutex) {
   if (mutex != NULL) {
     osal_mutex_lock(mutex, OSAL_TIMEOUT_WAIT_FOREVER);
   }
 }
 
-TU_ATTR_ALWAYS_INLINE static inline void _ff_unlock(osal_mutex_t mutex) {
+TU_ATTR_ALWAYS_INLINE static inline void ff_unlock(osal_mutex_t mutex) {
   if (mutex != NULL) {
     osal_mutex_unlock(mutex);
   }
diff --git a/test/hil/hil_test.py b/test/hil/hil_test.py
index 3a11cee13..aabf8a449 100755
--- a/test/hil/hil_test.py
+++ b/test/hil/hil_test.py
@@ -41,6 +41,7 @@ import fs
 import hashlib
 import ctypes
 from pymtp import MTP
+import string
 
 ENUM_TIMEOUT = 30
 
@@ -395,39 +396,57 @@ def test_device_cdc_dual_ports(board):
     ]
     ser = [open_serial_dev(p) for p in port]
 
-    str_test = [ b"test_no1", b"test_no2" ]
-    # Echo test write to each port and read back
-    for i in range(len(str_test)):
-        s = str_test[i]
-        l = len(s)
-        ser[i].write(s)
-        ser[i].flush()
-        rd = [ ser[i].read(l) for i in range(len(ser)) ]
-        assert rd[0] == s.lower(), f'Port1 wrong data: expected {s.lower()} was {rd[0]}'
-        assert rd[1] == s.upper(), f'Port2 wrong data: expected {s.upper()} was {rd[1]}'
+    def rand_ascii(length):
+        return "".join(random.choices(string.ascii_letters + string.digits, k=length)).encode("ascii")
+
+    sizes = [32, 64, 128, 256, 512, random.randint(2000, 5000)]
+
+    def write_and_check(writer, payload):
+        size = len(payload)
+        for s in ser:
+            s.reset_input_buffer()
+        ser[writer].write(payload)
+        ser[writer].flush()
+        rd0 = ser[0].read(size)
+        rd1 = ser[1].read(size)
+        assert rd0 == payload.lower(), f'Port0 wrong data ({size}): expected {payload.lower()[:16]}... was {rd0[:16]}'
+        assert rd1 == payload.upper(), f'Port1 wrong data ({size}): expected {payload.upper()[:16]}... was {rd1[:16]}'
+
+    for size in sizes:
+        payload0 = rand_ascii(size)
+        write_and_check(0, payload0)
+
+        payload1 = rand_ascii(size)
+        write_and_check(1, payload1)
     ser[0].close()
     ser[1].close()
 
 
 def test_device_cdc_msc(board):
     uid = board['uid']
-    # Echo test
+    # CDC Echo test
     port = get_serial_dev(uid, 'TinyUSB', "TinyUSB_Device", 0)
     ser = open_serial_dev(port)
 
-    test_str = b"test_str"
-    ser.write(test_str)
-    ser.flush()
-    rd_str = ser.read(len(test_str))
-    ser.close()
-    assert  rd_str == test_str, f'CDC wrong data: expected: {test_str} was {rd_str}'
+    def rand_ascii(length):
+        return "".join(random.choices(string.ascii_letters + string.digits, k=length)).encode("ascii")
 
-    # Block test
-    data = read_disk_file(uid,0,'README.TXT')
+    sizes = [32, 64, 128, 256, 512, random.randint(2000, 5000)]
+    for size in sizes:
+        test_str = rand_ascii(size)
+        ser.write(test_str)
+        ser.flush()
+        rd_str = ser.read(len(test_str))
+        assert rd_str == test_str, f'CDC wrong data ({size} bytes): expected: {test_str[:16]}... was {rd_str[:16]}'
+
+    ser.close()
+
+    # MSC Block test
+    data = read_disk_file(uid, 0, 'README.TXT')
     readme = \
-    b"This is tinyusb's MassStorage Class demo.\r\n\r\n\
-If you find any bugs or get any questions, feel free to file an\r\n\
-issue at github.com/hathach/tinyusb"
+        b"This is tinyusb's MassStorage Class demo.\r\n\r\n\
+      If you find any bugs or get any questions, feel free to file an\r\n\
+      issue at github.com/hathach/tinyusb"
 
     assert data == readme, 'MSC wrong data'