stm32f429i-disc1: STM32Cube#

Warning

This target is in a very preliminary state and is under active development. This demo gives a preview of the direction we are heading with pw_system, but it is not yet ready for production use.

The STMicroelectronics STM32F429I-DISC1 development board is currently Pigweed’s primary target for on-device testing and development. This target configuration uses pw_system on top of FreeRTOS and the STM32Cube HAL rather than a from-the-ground-up baremetal approach.

Setup#

To use this target, Pigweed must be set up to use FreeRTOS and the STM32Cube HAL for the STM32F4 series. The supported repositories can be downloaded via pw package, and then the build must be manually configured to point to the locations the repositories were downloaded to.

pw package install nanopb
pw package install freertos
pw package install stm32cube_f4

gn gen out --export-compile-commands --args="
  dir_pw_third_party_nanopb=\"$PW_PROJECT_ROOT/environment/packages/nanopb\"
  dir_pw_third_party_freertos=\"$PW_PROJECT_ROOT/environment/packages/freertos\"
  dir_pw_third_party_stm32cube_f4=\"$PW_PROJECT_ROOT/environment/packages/stm32cube_f4\"
"

Tip

Instead of the gn gen out with args set on the command line above you can run:

gn args out

Then add the following lines to that text file:

dir_pw_third_party_nanopb = getenv("PW_PACKAGE_ROOT") + "/nanopb"
dir_pw_third_party_freertos = getenv("PW_PACKAGE_ROOT") + "/freertos"
dir_pw_third_party_stm32cube_f4 = getenv("PW_PACKAGE_ROOT") + "/stm32cube_f4"

Building and Running the Demo#

This target has an associated demo application that can be built and then flashed to a device with the following commands:

ninja -C out pw_system_demo

openocd -f targets/stm32f429i_disc1/py/stm32f429i_disc1_utils/openocd_stm32f4xx.cfg \
  -c "program out/stm32f429i_disc1_stm32cube.size_optimized/obj/pw_system/bin/system_example.elf reset exit"

Once the board has been flashed, you can connect to it and send RPC commands via the Pigweed console:

pw-system-console -d /dev/{ttyX} -b 115200 \
  --proto-globs pw_rpc/echo.proto \
  --token-databases \
    out/stm32f429i_disc1_stm32cube.size_optimized/obj/pw_system/bin/system_example.elf

Replace {ttyX} with the appropriate device on your machine. On Linux this may look like ttyACM0, and on a Mac it may look like cu.usbmodem***.

When the console opens, try sending an Echo RPC request. You should get back the same message you sent to the device.

>>> device.rpcs.pw.rpc.EchoService.Echo(msg="Hello, Pigweed!")
(Status.OK, pw.rpc.EchoMessage(msg='Hello, Pigweed!'))

You can also try out our thread snapshot RPC service, which should return a stack usage overview of all running threads on the device in Host Logs.

>>> device.snapshot_peak_stack_usage()

Example output:

20220826 09:47:22  INF  PendingRpc(channel=1, method=pw.thread.ThreadSnapshotService.GetPeakStackUsage) completed: Status.OK
20220826 09:47:22  INF  Thread State
20220826 09:47:22  INF    5 threads running.
20220826 09:47:22  INF
20220826 09:47:22  INF  Thread (UNKNOWN): IDLE
20220826 09:47:22  INF  Est CPU usage: unknown
20220826 09:47:22  INF  Stack info
20220826 09:47:22  INF    Current usage:   0x20002da0 - 0x???????? (size unknown)
20220826 09:47:22  INF    Est peak usage:  390 bytes, 76.77%
20220826 09:47:22  INF    Stack limits:    0x20002da0 - 0x20002ba4 (508 bytes)
20220826 09:47:22  INF
20220826 09:47:22  INF  ...

You are now up and running!