fix concurrent mass storage test conflict, use pyfatfs to access disk…

… dev by usb id instead of mounted in /media/

test/hil/hil_test.py

@@ -33,8 +33,8 @@
 import subprocess
 import json
 import glob
-import platform
 from multiprocessing import Pool
+import fs
 
 ENUM_TIMEOUT = 30
 
@@ -53,9 +53,8 @@ def get_serial_dev(id, vendor_str, product_str, ifnum):
         return port_list[0]
 
 
-# Currently not used, left as reference
+# get usb disk by id
 def get_disk_dev(id, vendor_str, lun):
-    # get usb disk by id
     return f'/dev/disk/by-id/usb-{vendor_str}_Mass_Storage_{id}-0:{lun}'
 
 
@@ -72,34 +71,34 @@ def open_serial_dev(port):
                 # slight delay since kernel may occupy the port briefly
                 time.sleep(0.5)
                 timeout = timeout - 0.5
-                ser = serial.Serial(port, timeout=1)
+                ser = serial.Serial(port, timeout=2)
                 break
             except serial.SerialException:
                 pass
         time.sleep(0.5)
         timeout = timeout - 0.5
-    assert timeout, 'Device not available or Cannot open port'
+
+    assert timeout, f'Cannot open port f{port}' if os.path.exists(port) else f'Port {port} not existed'
     return ser
 
 
-def read_disk_file(id, fname):
-    # on different self-hosted, the mount point is different
-    file_list = [
-        f'/media/blkUSB_{id[-8:]}.02/{fname}',
-        f'/media/{os.getenv("USER")}/TinyUSB MSC/{fname}'
-    ]
+def read_disk_file(uid, lun, fname):
+    # open_fs("fat://{dev}) require 'pip install pyfatfs'
+    dev = get_disk_dev(uid, 'TinyUSB', lun)
     timeout = ENUM_TIMEOUT
     while timeout:
-        for file in file_list:
-            if os.path.isfile(file):
-                with open(file, 'rb') as f:
-                    data = f.read()
-                    return data
-
+        if os.path.exists(dev):
+            fat = fs.open_fs(f'fat://{dev}')
+            try:
+                assert fat.exists(fname), f'File {fname} not found in {dev}'
+                with fat.open(fname, 'rb') as f:
+                    return f.read()
+            finally:
+                fat.close()
         time.sleep(1)
         timeout = timeout - 1
 
-    assert timeout, 'Device not available'
+    assert timeout, f'Storage {dev} not existed'
     return None
 
 
@@ -238,7 +237,7 @@ def test_cdc_msc(board):
     assert ser.read(100) == str, 'CDC wrong data'
 
     # Block test
-    data = read_disk_file(uid, 'README.TXT')
+    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\
@@ -397,6 +396,7 @@ def test_board(board):
 
     return err_count
 
+
 def main():
     """
     Hardware test on specified boards