[roll third_party/pigweed] pw_chrono_freertos: Update SystemTimer comments

After further research, it was determined that there was no race
condition. The actual issue is that xTimerIsTimerActive is unreliable in
certain circumstances in FreeRTOS before
https://github.com/FreeRTOS/FreeRTOS-Kernel/pull/305.

Original-Bug: b/291346908
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/159231

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1c86969fd424fe4..e7488c09099a958
Roller-URL: https://ci.chromium.org/b/8774565687234102497
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9aba8b7d0257ac007d8980f96fba2b85fa730941
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/159333
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
1 file changed
tree: db1efc51e76e90a7aa4f3974befcd3828673c599
  1. applications/
  2. build_overrides/
  3. infra/
  4. pw_async_bench/
  5. pw_board_led/
  6. pw_board_led_arduino/
  7. pw_board_led_host/
  8. pw_board_led_mimxrt595_evk/
  9. pw_board_led_pico/
  10. pw_board_led_stm32cube/
  11. pw_board_led_stm32f429i_disc1/
  12. pw_board_led_stm32f769i_disc0/
  13. pw_digital_io_arduino/
  14. pw_digital_io_null/
  15. pw_digital_io_pico/
  16. pw_digital_io_stm32cube/
  17. pw_display_driver/
  18. pw_display_driver_ili9341/
  19. pw_display_driver_imgui/
  20. pw_display_driver_mipi/
  21. pw_display_driver_null/
  22. pw_display_driver_st7735/
  23. pw_display_driver_st7789/
  24. pw_graphics/
  25. pw_mipi_dsi/
  26. pw_mipi_dsi_mcuxpresso/
  27. pw_pixel_pusher/
  28. pw_spi_arduino/
  29. pw_spi_pico/
  30. pw_spi_stm32cube/
  31. pw_spin_delay/
  32. pw_spin_delay_arduino/
  33. pw_spin_delay_host/
  34. pw_spin_delay_mcuxpresso/
  35. pw_spin_delay_pico/
  36. pw_spin_delay_stm32cube/
  37. pw_spin_delay_stm32f429i_disc1/
  38. pw_spin_delay_stm32f769i_disc0/
  39. pw_sys_io_baremetal_stm32f769/
  40. targets/
  41. third_party/
  42. tools/
  43. .gitattributes
  44. .gitignore
  45. .gitmodules
  46. .gn
  47. activate.bat
  48. banner.txt
  49. bootstrap.bat
  50. bootstrap.sh
  51. BUILD.gn
  52. BUILDCONFIG.gn
  53. navbar.md
  54. OWNERS
  55. pigweed.json
  56. README.md
README.md

Pigweed Experimental

This repository contains experimental pigweed modules.

Repository setup

Clone this repo with --recursive to get all required submodules.

git clone --recursive https://pigweed.googlesource.com/pigweed/experimental

This will pull the Pigweed source repository into third_party/pigweed. If you already cloned but forgot to --recursive run git submodule update --init to pull all submodules.

pw_graphics

The //pw_graphics folder contains some libraries for drawing to an RGB565 framebuffer and displaying it on various platforms.

The demo applications that make use of these libraries are:

Build instructions

First time setup:

git clone --recursive https://pigweed.googlesource.com/pigweed/experimental
cd experimental
. ./bootstrap.sh
pw package install imgui
pw package install glfw
pw package install stm32cube_f4
pw package install pico_sdk

STM32F429-DISC1

Compile:

gn gen out --export-compile-commands --args="
  dir_pw_third_party_stm32cube_f4=\"$PW_PROJECT_ROOT/environment/packages/stm32cube_f4\"
"
ninja -C out

Flash:

openocd -f third_party/pigweed/targets/stm32f429i_disc1/py/stm32f429i_disc1_utils/openocd_stm32f4xx.cfg -c "program out/stm32f429i_disc1_stm32cube_debug/obj/applications/terminal_display/bin/terminal_demo.elf verify reset exit"

STM32F769-DISC0

First time setup:

pw package install stm32cube_f7

Compile:

gn gen out --export-compile-commands --args="
  dir_pw_third_party_stm32cube_f7=\"//environment/packages/stm32cube_f7\"
"
ninja -C out

Flash:

openocd -f targets/stm32f769i_disc0/py/stm32f769i_disc0_utils/openocd_stm32f7xx.cfg \
  -c "program out/stm32f769i_disc0_debug/obj/applications/blinky/bin/blinky.elf verify reset exit"

Linux, Windows or Mac

Compile:

gn gen out --export-compile-commands --args="
  dir_pw_third_party_imgui=\"$PW_PROJECT_ROOT/environment/packages/imgui\"
  dir_pw_third_party_glfw=\"$PW_PROJECT_ROOT/environment/packages/glfw\"
"
ninja -C out

Run:

out/host_debug/obj/applications/terminal_display/bin/terminal_demo

Raspberry Pi Pico Connected to an external SPI display

Working displays:

Compile:

gn gen out --export-compile-commands --args="
  PICO_SRC_DIR=\"$PW_PROJECT_ROOT/environment/packages/pico_sdk\"
"
ninja -C out

Flash:

  • Using a uf2 file:

    ./out/host_debug/obj/targets/rp2040/bin/elf2uf2 ./out/rp2040/obj/applications/terminal_display/bin/terminal_demo.elf ./out/rp2040/obj/applications/terminal_display/bin/terminal_demo.uf2
    

    Copy ./out/rp2040/obj/applications/terminal_display/bin/terminal_demo.uf2 to your Pi Pico.

  • Using a Pico Probe and openocd:

    This requires installing the Raspberry Pi foundation's OpenOCD fork for the Pico probe. More details including how to connect the two Pico boards is available at Raspberry Pi Pico and RP2040 - C/C++ Part 2: Debugging with VS Code

    Install RaspberryPi's OpenOCD Fork:

    git clone https://github.com/raspberrypi/openocd.git \
      --branch picoprobe \
      --depth=1 \
      --no-single-branch \
      openocd-picoprobe
    
    cd openocd-picoprobe
    
    ./bootstrap
    ./configure --enable-picoprobe --prefix=$HOME/apps/openocd --disable-werror
    make -j2
    make install
    

    Setup udev rules (Linux only):

    cat <<EOF > 49-picoprobe.rules
    SUBSYSTEMS=="usb", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="0004", MODE:="0666"
    KERNEL=="ttyACM*", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="0004", MODE:="0666"
    EOF
    sudo cp 49-picoprobe.rules /usr/lib/udev/rules.d/49-picoprobe.rules
    sudo udevadm control --reload-rules
    

    Flash the Pico:

    ~/apps/openocd/bin/openocd -f ~/apps/openocd/share/openocd/scripts/interface/picoprobe.cfg -f ~/apps/openocd/share/openocd/scripts/target/rp2040.cfg -c 'program out/rp2040/obj/applications/terminal_display/bin/terminal_demo.elf verify reset exit'
    

MIMXRT595-EVK Connected to an external MIPI display

Setup NXP SDK:

  1. Build a NXP SDK
  2. Download SDK
  3. Extract SDK's zip file to //environment/SDK_2_12_1_EVK-MIMXRT595

Compile:

gn gen out --export-compile-commands --args="
  pw_MIMXRT595_EVK_SDK=\"//environment/SDK_2_12_1_EVK-MIMXRT595\"
  pw_target_mimxrt595_evk_MANIFEST=\"//environment/SDK_2_12_1_EVK-MIMXRT595/EVK-MIMXRT595_manifest_v3_10.xml\"
  pw_third_party_mcuxpresso_SDK=\"//targets/mimxrt595_evk:mimxrt595_sdk\"
"

ninja -C out

Flash the MIMXRT595-EVK:

Follow the instructions to flash the MIMXRT595-EVK with the SEGGER J-Link firmware and using arm-none-eabi-gdb at https://pigweed.dev/targets/mimxrt595_evk/target_docs.html#running-and-debugging.

Teensy 4.1

https://www.pjrc.com/teensy/loader_cli.html

brew install teensy_loader_cli
OBJCOPY=/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-objcopy
INFILE=out/arduino_debug/obj/applications/terminal_display/bin/terminal_demo.elf
OUTFILE=foo.hex
$OBJCOPY -O ihex -R .eeprom -R .fuse -R .lock -R .signature $INFILE $OUTFILE
teensy_loader_cli --mcu=TEENSY41 -w -v $OUTFILE