zx0: added the license to more files

Update the source to include the full license block.

.drone.yml

@@ -0,0 +1,40 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+kind: pipeline
+name: default
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+  - name: fetch
+    image: alpine/git
+    failure: ignore
+    commands:
+      - git fetch --tags
+
+  - name: build
+    image: python
+    commands:
+      - pip3 install -r requirements.txt
+      - python3 setup.py bdist
+
+  - name: test
+    image: python
+    commands:
+      - pip3 install -r requirements.txt
+      - pip3 install pytest flake8
+      - flake8 hf2i2c

.gitignore

@@ -0,0 +1,7 @@
+build/
+dist/
+.vscode/
+.eggs/
+\#*
+*~
+*.egg-info/

CMakeLists.txt

@@ -1,8 +1,17 @@
+# Copyright 2021 Google LLC
 #
-# Copyright (c) 2021 Google LLC.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
 #
-# SPDX-License-Identifier: Apache-2.0
+#      http://www.apache.org/licenses/LICENSE-2.0
 #
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 cmake_minimum_required(VERSION 3.13.1)
 
 list(APPEND BOARD_ROOT ${CMAKE_CURRENT_SOURCE_DIR})

CONTRIBUTING.md

@@ -0,0 +1,16 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution;
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.

LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+   you may not use this file except in compliance with the License.
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+       http://www.apache.org/licenses/LICENSE-2.0
+
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+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

README.md

@@ -0,0 +1,9 @@
+# ZX0 bootloader
+
+This is an I2C based bootloader for the SAMD21. It implements the [Microsoft HF2][hf2] protocol over I2C and uses the same double-tap-for-bootloader and magic as the Adafruit UF2 bootloader.
+
+The bootloader is written in C++ and uses Zephyr for the drivers. It should be easy to adapt to the SAMD51 and other devices supported by Zephyr but each will need a custom I2C client driver.
+
+-- Michael Hope <mlhx@google.com> <michaelh@juju.nz>
+
+[hf2]: https://github.com/microsoft/uf2/blob/master/hf2.md

boards/arm/zx0/CMakeLists.txt

@@ -1,4 +1,16 @@
-# SPDX-License-Identifier: Apache-2.0
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 if(CONFIG_PINMUX_SAM0)
   zephyr_library()

boards/arm/zx0/Kconfig.board

@@ -1,6 +1,6 @@
-# Arduino Zero Board configuration
+# ZX0 Board configuration
 
-# Copyright (c) 2017 Google LLC.
+# Copyright (c) 2021 Google LLC.
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD_ZX0

boards/arm/zx0/Kconfig.defconfig

@@ -1,6 +1,6 @@
-# Arduino Zero board configuration
+# ZX0 board configuration
 
-# Copyright (c) 2017 Google LLC.
+# Copyright (c) 2021 Google LLC.
 # SPDX-License-Identifier: Apache-2.0
 
 config BOARD

boards/arm/zx0/board.cmake

@@ -1,4 +1,15 @@
-# Copyright (c) 2017 Google LLC.
-# SPDX-License-Identifier: Apache-2.0
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)

boards/arm/zx0/pinmux.c

@@ -1,7 +1,17 @@
 /*
- * Copyright (c) 2018 Google LLC.
+ * Copyright 2021 Google LLC
  *
- * SPDX-License-Identifier: Apache-2.0
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 #include <drivers/pinmux.h>

boards/arm/zx0/support/openocd.cfg

@@ -1,8 +1,6 @@
-# source [find interface/cmsis-dap.cfg]
 source [find interface/jlink.cfg]
 transport select swd
 
-# chip name
 set CHIPNAME at91samd21e18
 set ENDIAN little
 set CPUTAPID 0x0bc11477

boards/arm/zx0/zx0.dts

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 Google LLC.
+ * Copyright (c) 2021 Google LLC.
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -19,7 +19,6 @@
 		zephyr,code-partition = &boot_partition;
 	};
 
-	/* These aliases are provided for compatibility with samples */
 	aliases {
 		led0 = &led0;
 		led1 = &led1;
@@ -79,15 +78,5 @@
 			reg = <0x2000 DT_SIZE_K(256-8-16)>;
 			read-only;
 		};
-
-		/*
-		 * The final 16 KiB is reserved for the application.
-		 * Storage partition will be used by FCB/LittleFS/NVS
-		 * if enabled.
-		 */
-		storage_partition: partition@3c000 {
-			label = "storage";
-			reg = <0x0003c000 DT_SIZE_K(16)>;
-		};
 	};
 };

boards/arm/zx0/zx0.yaml

@@ -1,21 +0,0 @@
-identifier: zx0
-name: ZX0
-type: mcu
-arch: arm
-ram: 32
-flash: 256
-toolchain:
-  - zephyr
-  - gnuarmemb
-  - xtools
-supported:
-  - adc
-  - counter
-  - dma
-  - gpio
-  - hwinfo
-  - pinmux
-  - spi
-  - uart
-  - usb_device
-  - watchdog

boards/arm/zx0/zx0_defconfig

@@ -9,7 +9,3 @@ CONFIG_UART_CONSOLE=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_SERIAL=y
 CONFIG_PINMUX=y
-CONFIG_SOC_ATMEL_SAMD_XOSC32K=y
-CONFIG_SOC_ATMEL_SAMD_XOSC32K_AS_MAIN=y
-CONFIG_BOOTLOADER_BOSSA=y
-CONFIG_BOOTLOADER_BOSSA_ADAFRUIT_UF2=y

hf2i2c/__init__.py

@@ -0,0 +1,14 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+

hf2i2c/app.py

@@ -0,0 +1,201 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Host side programmer for the ZX0 bootloader.
+
+The bootloader implements the HF2 protocol. See https://github.com/microsoft/uf2/blob/master/hf2.md for the definition including the protocol level values.
+"""
+
+import enum
+from dataclasses import dataclass
+import random
+import struct
+from typing import List, Optional, Sequence
+
+import click
+import smbus
+import intelhex
+from crccheck.crc import Crc16Xmodem
+
+FILL = 0xFF
+
+
+class Command(enum.IntEnum):
+    BININFO = 0x0001
+    INFO = 0x0002
+    RESET_INTO_APP = 0x0003
+    RESET_INTO_BOOTLOADER = 0x0004
+    START_FLASH = 0x0005
+    WRITE_FLASH_PAGE = 0x0006
+    CHKSUM_PAGES = 0x0007
+    READ_WORDS = 0x0008
+    WRITE_WORDS = 0x0009
+    DMESG = 0x0010
+
+
+class Flag(enum.IntFlag):
+    SERIAL_OUT = 0x80
+    SERIAL_ERR = 0xC0
+    CMDPKT_LAST = 0x40
+    CMDPKT_BODY = 0x00
+    FLAG_MASK = 0xC0
+    SIZE_MASK = 63
+
+
+class Status(enum.IntEnum):
+    OK = 0
+    INVALID_CMD = 1
+    ERROR = 2
+
+
+@dataclass
+class BinInfo:
+    mode: int
+    flash_page_size: int
+    flash_num_pages: int
+    max_message_size: int
+    family_id: int
+
+
+class Error(Exception):
+    pass
+
+
+class HF2:
+    """Implements the HF2 flashing protocol over I2C."""
+
+    # Maximum number of bytes per packet. Must fit within the 32 bytes of a Linux write.
+    MAX_PACKET = 31
+
+    def __init__(self, bus: smbus.SMBus, address: int, command: int):
+        self._bus = bus
+        self._address = address
+        self._command = command
+
+        self._tag = random.randint(0, 30000)
+
+    def send(self, command: Command, args: Optional[bytes] = None) -> None:
+        self._tag = (self._tag + 1) & 0xFFFF
+        msg = struct.pack('<IHBB', command, self._tag, 0, 0)
+        if args:
+            msg += args
+
+        for i in range(0, len(msg), self.MAX_PACKET):
+            remain = len(msg) - i
+            take = min(remain, self.MAX_PACKET)
+            header = take
+            final = (i + self.MAX_PACKET >= len(msg))
+            if final:
+                header |= Flag.CMDPKT_LAST
+            packet = [header] + list(msg[i:i + take])
+            self._bus.write_i2c_block_data(self._address, self._command,
+                                           packet)
+
+    def exec(self, command: Command, args: Optional[bytes] = None) -> bytes:
+        self.send(command, args)
+        got = bytes(self._bus.read_block_data(self._address, self._command))
+        header, tag, status, status_info = struct.unpack_from('<BHBB', got, 0)
+
+        if (header & Flag.FLAG_MASK) != Flag.CMDPKT_LAST:
+            raise Error(
+                'Target returned a header {header:x}, want the last packet')
+        if tag != self._tag:
+            raise Error(
+                f'Target returned the wrong tag. Want {self._tag}, got {tag}')
+        if status != Status.OK:
+            raise Error(f'Target returned status {status}: {status_info}')
+
+        return got[5:]
+
+    def get_bininfo(self) -> BinInfo:
+        data = self.exec(Command.BININFO)
+        return BinInfo(*struct.unpack_from('<IIIII', data, 0))
+
+    def write_flash_page(self, address: int, data: bytes) -> None:
+        args = struct.pack('<I', address) + data
+        self.exec(Command.WRITE_FLASH_PAGE, args)
+
+    def chksum_pages(self, address: int, num_pages: int = 1) -> Sequence[int]:
+        args = struct.pack('<II', address, num_pages)
+        got = self.exec(Command.CHKSUM_PAGES, args)
+        return [
+            struct.unpack_from('<H', got, x)[0] for x in range(0, len(got), 2)
+        ]
+
+    def read_words(self, address: int, num_words: int = 1) -> Sequence[int]:
+        args = struct.pack('<II', address, num_words)
+        got = self.exec(Command.READ_WORDS, args)
+        return [
+            struct.unpack_from('<I', got, x)[0] for x in range(0, len(got), 4)
+        ]
+
+    def reset_into_app(self) -> None:
+        self.send(Command.RESET_INTO_APP)
+
+
+def _show_address(v) -> str:
+    if v is None:
+        return ''
+    return '%x' % v
+
+
+@click.command()
+@click.option('--bus', default=3, help='I2C bus')
+@click.option('--address', default=0x22, help='Device address')
+@click.option('--command', default=0xFE, help='HF2 command')
+@click.option('--program',
+              type=click.File(),
+              help='Hex file to program to the device')
+@click.option('--start',
+              is_flag=True,
+              help='Start the application running after any other operations')
+def main(bus: int, address: int, command: int, program: str, start: bool):
+    b = smbus.SMBus(bus)
+    h = HF2(b, address, command)
+
+    info = h.get_bininfo()
+    click.echo(f'Found a device with {info.flash_num_pages} pages of '
+               f'{info.flash_page_size} bytes')
+
+    if program:
+        hex = intelhex.IntelHex()
+        hex.fromfile(program, format='hex')
+
+        page = info.flash_page_size
+        addresses: List[int] = []
+        for start, end in hex.segments():
+            addresses.extend(range(start, end, page))
+
+        with click.progressbar(addresses,
+                               label='Program',
+                               item_show_func=_show_address) as bar:
+            for address in bar:
+                data = [
+                    hex[x] for x in range(address, min(address + page, end))
+                ]
+                data += [FILL] * (page - len(data))
+                assert len(data) == page
+                h.write_flash_page(address, bytes(data))
+                got, want = h.chksum_pages(address)[0], Crc16Xmodem.calc(data)
+                if got != want and address >= 16384:
+                    raise Error(f'Program error at address {address:x}. '
+                                f'Want CRC {want:x}, got {got:x}')
+
+    if start:
+        click.echo('Starting app')
+        h.reset_into_app()
+
+
+if __name__ == '__main__':
+    main()

requirements.txt

@@ -0,0 +1,4 @@
+click>=8.0
+smbus>=1.1
+intelhex>=2.3.0
+crccheck>=1.0

setup.py

@@ -0,0 +1,31 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from setuptools import find_packages, setup
+
+setup(
+    name='hf2i2c',
+    version_format='{tag}.dev{commitcount}+{gitsha}',
+    setup_requires=['setuptools-git-version'],
+    url='https://juju.nz/src/michaelh/zx0-bootloader',
+    author='Michael Hope',
+    author_email='michaelh@juju.nz',
+    description='hf2i2c programmer',
+    zip_safe=True,
+    packages=find_packages(),
+    entry_points='''
+[console_scripts]
+hf2i2c=hf2i2c.app:main
+    ''',
+)

src/hal.cpp

@@ -1,8 +1,17 @@
-/*
- * Copyright (c) 2021 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include "hal.h"
 
 #include <drivers/gpio.h>

src/hal.h

@@ -1,8 +1,17 @@
-/*
- * Copyright (c) 2021 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #pragma once
 
 #include <device.h>

src/hf2.cpp

@@ -1,8 +1,17 @@
-/*
- * Copyright (c) 2021 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include "hf2.h"
 
 #include <drivers/flash.h>

src/hf2.h

@@ -1,8 +1,19 @@
 /*
- * Copyright (c) 2021 Google LLC.
+ * Copyright 2021 Google LLC
  *
- * SPDX-License-Identifier: Apache-2.0
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
+
 #pragma once
 
 #include <device.h>

src/i2c_sam0.cpp

@@ -1,8 +1,17 @@
-/*
- * Copyright (c) 2021 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include "i2c_sam0.h"
 
 static constexpr uint8_t kCommand = 0xFE;

src/i2c_sam0.h

@@ -1,8 +1,17 @@
-/*
- * Copyright (c) 2021 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #pragma once
 
 #include <soc.h>

src/main.cpp

@@ -1,8 +1,17 @@
-/*
- * Copyright (c) 2021 Google LLC.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include "hal.h"
 #include "hf2.h"
 #include "i2c_sam0.h"