Add Bangle.js 2, JDI memory displays and ACeP epd

This 2-in-1 PR started with the goal of support the Bangle.js 2
smartwatch with *no USB*.
* Adds "secure" DFU build support with a committed private key.
* Adds 3-bit color support with one dummy bit for the JDI memory display
* Allows nrf boards to have a board_background_task() run in RUN_BACKGROUND_TASK.
  This is needed because the Bangle.js 2 uses the watchdog to reset.
* Renamed port_background_task() to port_background_tick() to indicate it
  runs on tick, not RUN_BACKGROUND_TASK.
* Marks serial connected when the display terminal is inited. This means
  that safe mode messages show up on the display.

ACep, 7-color epaper displays also pack 3 bits in 4. So, I added that
support as well.
* Adds 3-bit ACeP color support for 7-color e-paper displays. (Not
  watch related but similar due to color depth.)
* Allows a refresh sequence instead of a single int command. The 7" ACeP
  display requires a data byte for refresh.
* Adds optional delay after resetting the display. The ACeP displays
  need this. (Probably to load LUTs from flash.)
* Adds a cleaning phase for ACeP displays before the real refresh.

For both:
* Add dither support to Palette.
* Palette no longer converts colors when set. Instead, it caches
  converted colors at each index.
* ColorConverter now caches the last converted color. It should make
  conversions faster for repeated colors (not dithering.)

Author: tannewt

.github/actions/deps/external/action.yml

@@ -37,7 +37,7 @@ runs:
 
     # arm
     - name: Get arm toolchain
-      if: inputs.platform == 'aarch' || inputs.platform == 'arm'
+      if: inputs.platform == 'aarch' || inputs.platform == 'arm' || inputs.platform == 'nrf'
       uses: carlosperate/arm-none-eabi-gcc-action@v1
       with:
         release: '10-2020-q4'
@@ -65,6 +65,22 @@ runs:
         echo >> $GITHUB_PATH "$PATH"
       shell: bash
 
+    # nrf
+    - name: Get nrfutil 7+
+      if: inputs.platform == 'nrf'
+      run: |
+        wget https://developer.nordicsemi.com/.pc-tools/nrfutil/x64-linux/nrfutil
+        chmod +x nrfutil
+        ./nrfutil install nrf5sdk-tools
+        mkdir -p $HOME/.local/bin
+        mv nrfutil $HOME/.local/bin
+        echo "$HOME/.local/bin" >> $GITHUB_PATH
+      shell: bash
+    - name: Print nrfutil version
+      if: inputs.platform == 'nrf'
+      run: nrfutil -V
+      shell: bash
+
     # riscv
     - name: Get riscv toolchain
       if: inputs.platform == 'riscv'

.github/workflows/build.yml

@@ -25,6 +25,7 @@ jobs:
       boards-aarch: ${{ steps.set-matrix.outputs.boards-aarch }}
       boards-arm: ${{ steps.set-matrix.outputs.boards-arm }}
       boards-esp: ${{ steps.set-matrix.outputs.boards-esp }}
+      boards-nrf: ${{ steps.set-matrix.outputs.boards-nrf }}
       boards-riscv: ${{ steps.set-matrix.outputs.boards-riscv }}
       boards-rpi: ${{ steps.set-matrix.outputs.boards-rpi }}
       cp-version: ${{ steps.set-up-submodules.outputs.version }}
@@ -252,6 +253,16 @@ jobs:
       boards: ${{ needs.scheduler.outputs.boards-esp }}
       cp-version: ${{ needs.scheduler.outputs.cp-version }}
 
+  nrf:
+    needs: [scheduler, mpy-cross, tests]
+    if: ${{ needs.scheduler.outputs.boards-nrf != '[]' }}
+    uses: ./.github/workflows/build-boards.yml
+    secrets: inherit
+    with:
+      platform: nrf
+      boards: ${{ needs.scheduler.outputs.boards-nrf }}
+      cp-version: ${{ needs.scheduler.outputs.cp-version }}
+
   riscv:
     needs: [scheduler, mpy-cross, tests]
     if: ${{ needs.scheduler.outputs.boards-riscv != '[]' }}

data/nvm.toml

@@ -202,10 +202,6 @@ msgstr ""
 msgid "%q out of range"
 msgstr ""
 
-#: ports/atmel-samd/common-hal/microcontroller/Pin.c
-msgid "%q pin invalid"
-msgstr ""
-
 #: py/objrange.c py/objslice.c shared-bindings/random/__init__.c
 msgid "%q step cannot be zero"
 msgstr ""
@@ -1210,9 +1206,11 @@ msgid "Internal watchdog timer expired."
 msgstr ""
 
 #: py/argcheck.c shared-bindings/digitalio/DigitalInOut.c
+#: shared-bindings/displayio/EPaperDisplay.c
 msgid "Invalid %q"
 msgstr ""
 
+#: ports/atmel-samd/common-hal/microcontroller/Pin.c
 #: shared-bindings/microcontroller/Pin.c
 msgid "Invalid %q pin"
 msgstr ""

locale/circuitpython.pot

@@ -57,5 +57,8 @@ void port_finish_background_task(void) {
 }
 #endif
 
+void port_background_tick(void) {
+}
+
 void port_background_task(void) {
 }

ports/atmel-samd/background.c

@@ -52,6 +52,10 @@ uint8_t stop_sequence[] = {
     0x02, 0x80, 0xf0  // Power off
 };
 
+uint8_t refresh_sequence[] = {
+    0x12, 0x00
+};
+
 void board_init(void) {
     busio_spi_obj_t *spi = &displays[0].fourwire_bus.inline_bus;
     common_hal_busio_spi_construct(spi, &pin_PB13, &pin_PB15, NULL, false);
@@ -74,6 +78,7 @@ void board_init(void) {
         bus,
         start_sequence,
         sizeof(start_sequence),
+        0, // start up time
         stop_sequence,
         sizeof(stop_sequence),
         300, // width
@@ -92,13 +97,15 @@ void board_init(void) {
         NO_COMMAND, // write_color_ram_command (can add this for grayscale eventually)
         false, // color_bits_inverted
         0x000000, // highlight_color
-        0x12, // refresh_display_command
+        refresh_sequence, // refresh_display_sequence
+        sizeof(refresh_sequence),
         40, // refresh_time
         &pin_PA01, // busy_pin
         false, // busy_state
         5, // seconds_per_frame
         false, // chip_select (don't always toggle chip select)
         false, // grayscale
+        false, // acep
         false); // two_byte_sequence_length
 }
 

ports/atmel-samd/boards/openbook_m4/board.c

@@ -53,3 +53,10 @@ CIRCUITPY_DISPLAY_FONT = $(TOP)/ports/atmel-samd/boards/ugame10/brutalist-6.bdf
 
 # Override optimization to keep binary small
 OPTIMIZATION_FLAGS = -Os
+
+# We don't have room for the fonts for terminalio for certain languages,
+# so turn off terminalio and force a clean build.
+ifneq (,$(filter $(TRANSLATION),ja ko ru))
+CIRCUITPY_TERMINALIO = 0
+RELEASE_NEEDS_CLEAN_BUILD = 1
+endif

ports/atmel-samd/boards/pewpew_m4/mpconfigboard.mk

@@ -211,5 +211,5 @@ mcu_pin_function_t *mcu_find_pin_function(mcu_pin_function_t *table, const mcu_p
             return table;
         }
     }
-    mp_raise_ValueError_varg(translate("%q pin invalid"), name);
+    mp_raise_ValueError_varg(translate("Invalid %q pin"), name);
 }

ports/atmel-samd/common-hal/microcontroller/Pin.c

@@ -33,5 +33,8 @@ void port_start_background_task(void) {
 void port_finish_background_task(void) {
 }
 
+void port_background_tick(void) {
+}
+
 void port_background_task(void) {
 }

ports/broadcom/background.c

@@ -30,6 +30,8 @@
 #include "supervisor/filesystem.h"
 #include "supervisor/shared/stack.h"
 
+void port_background_tick(void) {
+}
 void port_background_task(void) {
 }
 void port_start_background_task(void) {