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Double deploy required to flash Swan_R5 #1495

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@zfields

Description

@zfields

Describe the bug
When deploying a sketch to the Swan (STM32L4xx), the first deploy seems to hang in the bootloader and the sketch will not load. If a redeploy is attempted, then the sketch will load as expected. This reoccurs every time a change is made to the sketch code.

To Reproduce
Use the Blink example from the Arduino Examples folder.

Steps to reproduce the behavior:

  1. Using the Swan (or perhaps any Generic STM32L4xx)
  2. Flash the Blink app using the Arduino IDE or VSCode
  3. See error (no blinking)

Expected behavior
I would expect the device to start the sketch once it has been programmed.

Desktop (please complete the following information):

  • OS: Verified on Mac, Linux and Windows
  • Arduino IDE version: 1.8.13
  • STM32 core version: 2.0.0 (@ master)
  • Tools menu settings if not the default: C Runtime Library - Newlib Nano (default), Debug Symbols - Enabled (-g), Optimize - Debug (-Og), USB Speed - Low/Full Speed, USB Support - CDC (generic Serial supercede U(S)ART), U(S)ART support: - Enabled (generic Serial),
  • Upload method: SWD

Board (please complete the following information):

  • Name: Generic STM32L4 series
  • Hardware Revision: Swan R5

Additional context
Modifying line 5070 of ~/.arduino15/packages/STMicroelectronics/hardware/stm32/2.0.0/boards.txt, to read:

GenL4.menu.upload_method.swdMethod.upload.protocol=10

opposed to the original:

GenL4.menu.upload_method.swdMethod.upload.protocol=0

... seems to have fixed the problem.

Can you explain what is happening and explain if there is a better and/or more targeted option for the Swan?

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