Hi. I'm developing a custom board using STM32WB09TEF7TR microcontroller.
I had a problem re-accessing the microcontroller using SWD once I finished programming one time.
I found that it is due to the SPI3 (PA3) and one GPIO pin (PA2) sharing the pin for SWD (SWCLK and SWDIO).
So, I want to control this microcontroller with two stages, "operation mode" / "programming mode", that change the pin setting from SPI3 / GPIO_out to not assigned pin for SWD.
Could you tell me what I can do about this?
I failed to change the pin setting using the function below.
void enter_SWD_mode(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = SYNC_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(SYNC_GPIO_Port, &GPIO_InitStruct);
APP_DBG_MSG("SWD Mode activated.\r\n");
}
