upload update uf2 separately in release

Add USB connect timeout for app reset to UF2 or Serial via GPREGRET

.github/workflows/githubci.yml

@@ -66,7 +66,7 @@ jobs:
         # 9.3.1-1.2.1 is xpack modified version which significantly increased compiled size to 6-7KB and cause flash overflow.
         # Skip this version for now, we will try again with next official release from ARM
         xpm install --global @xpack-dev-tools/arm-none-eabi-gcc@9.3.1-1.1.1
-        echo `echo $HOME/opt/xPacks/@xpack-dev-tools/arm-none-eabi-gcc/*/.content/bin` >> $GITHUB_PATH
+        echo `echo $HOME/.local/xPacks/@xpack-dev-tools/arm-none-eabi-gcc/*/.content/bin` >> $GITHUB_PATH
     
     - name: Build
       run: |
@@ -78,12 +78,11 @@ jobs:
         name: ${{ matrix.board }}
         path: _bin/${{ matrix.board }}
 
-    - name: Creat Release Asset
+    - name: Create Release Asset
       if: ${{ github.event_name == 'release' }}
       run: zip -jr ${{ matrix.board }}_bootloader-${{ github.event.release.tag_name }}.zip _bin/${{ matrix.board }}
 
     - name: Upload Release Asset
-      id: upload-release-asset
       uses: actions/upload-release-asset@v1
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -94,3 +93,13 @@ jobs:
         asset_name: ${{ matrix.board }}_bootloader-${{ github.event.release.tag_name }}.zip
         asset_content_type: application/zip
       
+    - name: Upload Release Asset for Self-Update
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      if: ${{ github.event_name == 'release' }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: _bin/${{ matrix.board }}/update-${{ matrix.board }}_bootloader-${{ github.event.release.tag_name }}_nosd.uf2
+        asset_name: update-${{ matrix.board }}_bootloader-${{ github.event.release.tag_name }}_nosd.uf2
+        asset_content_type: application/x-binary

README.md

@@ -57,6 +57,14 @@ There are two pins, `DFU` and `FRST` that bootloader will check upon reset/power
 - The `GPREGRET` register can also be set to force the bootloader can enter any of above modes (plus a CDC-only mode for Arduino).
 `GPREGRET` is set by the application before performing a soft reset.
 
+```c
+#include "nrf_nvic.h"
+void reset_to_uf2(void) {
+  NRF_POWER->GPREGRET = 0x57; // 0xA8 OTA, 0x4e Serial
+  NVIC_SystemReset();         // or sd_nvic_SystemReset();
+}
+```
+
 On the Nordic PCA10056 DK board, `DFU` is connected to **Button1**, and `FRST` is connected to **Button2**.
 So holding down **Button1** while clicking **RESET** will put the board into USB bootloader mode, with UF2 and CDC support.
 Holding down **Button2** while clicking **RESET** will put the board into OTA (over-the-air) bootloader mode.
@@ -69,7 +77,7 @@ For other boards, please check the board definition for details.
 
 ### Making your own UF2
 
-To create your own UF2 DFU update image, simply use the [Python conversion script](https://github.com/Microsoft/uf2/blob/master/utils/uf2conv.py) on a .bin file or .hex file, specifying the family as **0xADA52840**. If using a .bin file with the conversion script you must specify application address with the -b switch, this address depend on the SoftDevice size/version e.g S140 v6 is 0x26000 
+To create your own UF2 DFU update image, simply use the [Python conversion script](https://github.com/Microsoft/uf2/blob/master/utils/uf2conv.py) on a .bin file or .hex file, specifying the family as **0xADA52840**. If using a .bin file with the conversion script you must specify application address with the -b switch, this address depend on the SoftDevice size/version e.g S140 v6 is 0x26000
 
 To create a UF2 image from a .bin file:
 ```
@@ -105,6 +113,15 @@ You must have have a J-Link available to "unbrick" your device.
 Prerequisites
 
 - ARM GCC
+
+To install for macos
+
+```bash
+brew tap ArmMbed/homebrew-formulae
+brew install arm-none-eabi-gcc
+brew link --overwrite arm-none-eabi-gcc # if a prior version was present
+```
+
 - Nordic's [nRF5x Command Line Tools](https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Command-Line-Tools)
 - [Python IntelHex](https://pypi.org/project/IntelHex/)
 
@@ -148,7 +165,7 @@ Makefile:90: *** BOARD not defined.  Stop
 If you get the following error ...
 
 ```
-$ make BOARD=feather_nrf52840_express all 
+$ make BOARD=feather_nrf52840_express all
 Compiling file: main.c
 /bin/sh: /usr/bin/arm-none-eabi-gcc: No such file or directory
 make: *** [_build/main.o] Error 127
@@ -160,6 +177,8 @@ the variable `CROSS_COMPILE` as below:
 $ make CROSS_COMPILE=/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi- BOARD=feather_nrf52832 all
 ```
 
+For other compile errors, check the gcc version with `arm-none-eabi-gcc --version` to insure it is at least 9.x.
+
 #### 2. `ModuleNotFoundError: No module named 'intelhex'`
 
 Install python-intelhex with
@@ -169,9 +188,6 @@ pip install intelhex
 ```
 
 
-
-
-
 #### 3. `make: nrfjprog: No such file or directory`
 
 Make sure that `nrfjprog` is available from the command-line. This binary is

changelog.md

@@ -1,5 +1,10 @@
 # Adafruit nRF52 Bootloader Changelog
 
+## 0.4.1 - 2021.02.17
+
+- Add USB connect timeout for app reset to UF2 or Serial via GPREGRET
+- Fix pollution of REGOUT0 reserved bits
+
 ## 0.4.0 - 2021.01.19
 
 - Decouple bootloader and softdevice i.e bootloader will always work with and/or without softdevice present. This allows application to pack firmware + softdevice into an uf2/serial for DFU.

src/boards/boards.c

@@ -94,11 +94,13 @@ void board_init(void)
 //     #define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3
 // in board.h when using that power configuration.
 #ifdef UICR_REGOUT0_VALUE
-  if (NRF_UICR->REGOUT0 != UICR_REGOUT0_VALUE) 
+  if ((NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk) !=
+      (UICR_REGOUT0_VALUE << UICR_REGOUT0_VOUT_Pos))
   {
       NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
       while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
-      NRF_UICR->REGOUT0 = UICR_REGOUT0_VALUE;
+      NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |
+                          (UICR_REGOUT0_VALUE << UICR_REGOUT0_VOUT_Pos);
 
       NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
       while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

src/main.c

@@ -170,9 +170,10 @@ int main(void)
 
   // Serial only mode
   bool serial_only_dfu = (NRF_POWER->GPREGRET == DFU_MAGIC_SERIAL_ONLY_RESET);
+  bool uf2_dfu = (NRF_POWER->GPREGRET == DFU_MAGIC_UF2_RESET);
 
   // start either serial, uf2 or ble
-  bool dfu_start = _ota_dfu || serial_only_dfu || (NRF_POWER->GPREGRET == DFU_MAGIC_UF2_RESET) ||
+  bool dfu_start = _ota_dfu || serial_only_dfu || uf2_dfu ||
                     (((*dbl_reset_mem) == DFU_DBL_RESET_MAGIC) && (NRF_POWER->RESETREAS & POWER_RESETREAS_RESETPIN_Msk));
 
   // Clear GPREGRET if it is our values
@@ -251,7 +252,7 @@ int main(void)
     }
 
     // Initiate an update of the firmware.
-    if (APP_ASKS_FOR_SINGLE_TAP_RESET())
+    if (APP_ASKS_FOR_SINGLE_TAP_RESET() || uf2_dfu || serial_only_dfu)
     {
       // If USB is not enumerated in 3s (eg. because we're running on battery), we restart into app.
       APP_ERROR_CHECK( bootloader_dfu_start(_ota_dfu, 3000, true) );