Add ability to select a device for DFU flashing

docs/en/api-guides/dfu.rst

@@ -64,6 +64,22 @@ which relies on `dfu-util <http://dfu-util.sourceforge.net/>`_. Please see :ref:
 installing ``dfu-util``. ``dfu-util`` needs additional setup for :ref:`api_guide_dfu_flash_win` or setting up an
 :ref:`api_guide_dfu_flash_udev`. Mac OS users should be able to use ``dfu-util`` without further setup.
 
+If there are more boards with the same chip connected then ``idf.py dfu-list`` can be used to list the available
+devices, for example::
+
+    Found Runtime: [303a:0002] ver=0723, devnum=4, cfg=1, intf=2, path="1-10", alt=0, name="UNKNOWN", serial="0"
+    Found Runtime: [303a:0002] ver=0723, devnum=6, cfg=1, intf=2, path="1-2", alt=0, name="UNKNOWN", serial="0"
+
+Consequently, the desired device can be selected for flashing by the ``--path`` argument. For example, the devices
+listed above can be flashed individually by the following commands::
+
+    idf.py dfu-flash --path 1-10
+    idf.py dfu-flash --path 1-2
+
+.. note::
+    The vendor and product identificators are set based on the selected chip target by the ``idf.py set-target``
+    command and it is not selectable during the ``idf.py dfu-flash`` call.
+
 See :ref:`api_guide_dfu_flash_errors` and their solutions.
 
 .. _api_guide_dfu_flash_udev:

tools/cmake/dfu.cmake

@@ -3,8 +3,12 @@
 
 function(__add_dfu_targets)
     idf_build_get_property(target IDF_TARGET)
-    if(NOT "${target}" STREQUAL "esp32s2")
+    if("${target}" STREQUAL "esp32")
         return()
+    elseif("${target}" STREQUAL "esp32s2")
+        set(dfu_pid "2")
+    else()
+        message(FATAL_ERROR "DFU PID unknown for ${target}")
     endif()
 
     idf_build_get_property(python PYTHON)
@@ -14,13 +18,21 @@ function(__add_dfu_targets)
         COMMAND ${python} ${idf_path}/tools/mkdfu.py write
         -o "${CMAKE_CURRENT_BINARY_DIR}/dfu.bin"
         --json "${CMAKE_CURRENT_BINARY_DIR}/flasher_args.json"
+        --pid "${dfu_pid}"
         DEPENDS gen_project_binary bootloader
         VERBATIM
         USES_TERMINAL)
 
+    add_custom_target(dfu-list
+        COMMAND ${CMAKE_COMMAND}
+        -D ESP_DFU_LIST="1"
+        -P ${idf_path}/tools/cmake/run_dfu_util.cmake
+        USES_TERMINAL)
+
     add_custom_target(dfu-flash
-        COMMAND dfu-util
-        -D "${CMAKE_CURRENT_BINARY_DIR}/dfu.bin"
-        VERBATIM
+        COMMAND ${CMAKE_COMMAND}
+        -D ESP_DFU_BIN="${CMAKE_CURRENT_BINARY_DIR}/dfu.bin"
+        -D ESP_DFU_PID="${dfu_pid}"
+        -P ${idf_path}/tools/cmake/run_dfu_util.cmake
         USES_TERMINAL)
 endfunction()

tools/cmake/run_dfu_util.cmake

@@ -0,0 +1,28 @@
+# A CMake script to run dfu-util from within ninja or make
+# or another cmake-based build runner
+#
+# It is recommended to NOT USE this CMake script directly
+
+cmake_minimum_required(VERSION 3.5)
+
+set(TOOL "dfu-util")
+set(CMD "${TOOL}")
+
+if(${ESP_DFU_LIST})
+    list(APPEND CMD "--list")
+else()
+    # The following works even when ESP_DFU_PID is not defined.
+    list(APPEND CMD "-d" "303a:${ESP_DFU_PID}")
+
+    if(NOT $ENV{ESP_DFU_PATH} STREQUAL "")
+        list(APPEND CMD "--path" $ENV{ESP_DFU_PATH})
+    endif()
+    list(APPEND CMD "-D" ${ESP_DFU_BIN})
+endif()
+
+message("Command list: ${CMD}")
+execute_process(COMMAND ${CMD} RESULT_VARIABLE result)
+
+if(${result})
+    message(FATAL_ERROR "${TOOL} failed")
+endif()

tools/idf_py_actions/dfu_ext.py

@@ -10,11 +10,11 @@ def action_extensions(base_actions, project_path):
         ensure_build_directory(args, ctx.info_name)
         run_target(target_name, args)
 
-    def dfu_flash_target(target_name, ctx, args):
+    def dfu_flash_target(target_name, ctx, args, path):
         ensure_build_directory(args, ctx.info_name)
 
         try:
-            run_target(target_name, args)
+            run_target(target_name, args, {"ESP_DFU_PATH": path})
         except FatalError:
             # Cannot capture the error from dfu-util here so the best advise is:
             print('Please have a look at the "Device Firmware Upgrade through USB" chapter in API Guides of the '
@@ -28,10 +28,24 @@ def action_extensions(base_actions, project_path):
                 "short_help": "Build the DFU binary",
                 "dependencies": ["all"],
             },
+            "dfu-list": {
+                "callback": dfu_target,
+                "short_help": "List DFU capable devices",
+                "dependencies": [],
+            },
             "dfu-flash": {
                 "callback": dfu_flash_target,
                 "short_help": "Flash the DFU binary",
                 "order_dependencies": ["dfu"],
+                "options": [
+                    {
+                        "names": ["--path"],
+                        "default": "",
+                        "help": "Specify path to DFU device. The default empty path works if there is just one "
+                                "ESP device with the same product identificator. See the device list for paths "
+                                "of available devices."
+                    }
+                ],
             },
         }
     }

tools/mkdfu.py

@@ -107,8 +107,6 @@ DFUSuffix = namedtuple(
     "DFUSuffix", ["bcd_device", "pid", "vid", "bcd_dfu", "sig", "len"]
 )
 ESPRESSIF_VID = 12346
-# TODO: set PID based on the chip type (add a command line argument)
-DFUSUFFIX_DEFAULT = DFUSuffix(0xFFFF, 0xFFFF, ESPRESSIF_VID, 0x0100, b"UFD", 16)
 # This CRC32 gets added after DFUSUFFIX_STRUCT
 DFUCRC_STRUCT = b"<I"
 
@@ -126,8 +124,9 @@ def pad_bytes(b, multiple, padding=b"\x00"):  # type: (bytes, int, bytes) -> byt
 
 
 class EspDfuWriter(object):
-    def __init__(self, dest_file):  # type: (typing.BinaryIO) -> None
+    def __init__(self, dest_file, pid):  # type: (typing.BinaryIO) -> None
         self.dest = dest_file
+        self.pid = pid
         self.entries = []  # type: typing.List[bytes]
         self.index = []  # type: typing.List[DFUInfo]
 
@@ -151,7 +150,8 @@ class EspDfuWriter(object):
         out_data = pad_bytes(out_data, cpio_block_size)
 
         # Add DFU suffix and CRC
-        out_data += struct.pack(DFUSUFFIX_STRUCT, *DFUSUFFIX_DEFAULT)
+        dfu_suffix = DFUSuffix(0xFFFF, self.pid, ESPRESSIF_VID, 0x0100, b"UFD", 16)
+        out_data += struct.pack(DFUSUFFIX_STRUCT, *dfu_suffix)
         out_data += struct.pack(DFUCRC_STRUCT, dfu_crc(out_data))
 
         # Finally write the entire binary
@@ -187,7 +187,7 @@ class EspDfuWriter(object):
 
 
 def action_write(args):
-    writer = EspDfuWriter(args['output_file'])
+    writer = EspDfuWriter(args['output_file'], args['pid'])
     for addr, f in args['files']:
         print('Adding {} at {:#x}'.format(f, addr))
         writer.add_file(addr, f)
@@ -205,6 +205,10 @@ def main():
                               help='Filename for storing the output DFU image',
                               required=True,
                               type=argparse.FileType("wb"))
+    write_parser.add_argument("--pid",
+                              required=True,
+                              type=lambda h: int(h, 16),
+                              help='Hexa-decimal product indentificator')
     write_parser.add_argument("--json",
                               help='Optional file for loading "flash_files" dictionary with <address> <file> items')
     write_parser.add_argument("files",
@@ -241,6 +245,7 @@ def main():
 
     cmd_args = {'output_file': args.output_file,
                 'files': files,
+                'pid': args.pid,
                 }
 
     {'write': action_write

tools/test_mkdfu/test_mkdfu.py

@@ -35,6 +35,7 @@ class TestHelloWorldExample(unittest.TestCase):
             self.addCleanup(os.unlink, f.name)
         cmd = ' '.join([sys.executable, mkdfu_path, 'write',
                         '-o', f.name,
+                        '--pid', '2',
                         add_args])
         p = pexpect.spawn(cmd, timeout=10)
         self.addCleanup(p.terminate, force=True)
@@ -81,6 +82,7 @@ class TestHelloWorldExample(unittest.TestCase):
 
         cmd = ' '.join([sys.executable, mkdfu_path, 'write',
                         '-o', output,
+                        '--pid', '2',
                         ' '.join(['0x1000', bootloader,
                                   '0x8000', os.path.join(current_dir, '1', '2.bin'),
                                   '0x10000', os.path.join(current_dir, '1', '3.bin')