1. Purpose
STM32WB0x application like BLE_Beacon configures the STM32WB0 series device in order to enter Deepstop mode when allowed.
When the STM32WB0 series device is in Deepstop mode, the SWD port is disabled. As a consequence, SWD access is disabled and the chip cannot be accessed. In this context, the user can activate the device UART bootloader by setting the PA10 pin to a high value and perform a reset cycle of the device (keeping PA10 at a high value).
For example, when using a NUCLEO-WB09KE board, the user can simply fit jumper JP1 in bootloader position and perform a hardware reset through button B4. This allows the activation of the UART bootloader and programs a new application through the SWD. After programming, the user must remove the JP1 jumper.
| NUCLEO-WB09KE Debug Tips with active low power mode |
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An alternative approach is to perform a mass erase of the device using the STM32CubeProgrammer tool in
UART mode, and then program a new application through the SWD.