How to solve the problem of "No target connected" when KEIL is displayed-EEWORLD

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When learning with STM32F051Disconvery, when configuring GPIOA, I accidentally configured both ports connected to the SWD bus as outputs. This is terrible. I can no longer use SWD to simulate or download programs. The solution is as follows:

1. First make sure the target board is powered on.

2. First, press and hold the reset button on the target board, then click Settings, and then release the reset button on the target board.

3. At this time, KEIL opens the Settings dialog box. Please confirm the content in the red circle before proceeding to the next step.

4. Power off the STM32F051Disconvery board and then power it back on.

5. First, long press the reset button of STM32F051Disconvery, then click the simulation or download button, and then release the reset button.
Note: Clicking simulation to releasing the reset button here is not always successful. The time from clicking the simulation button to releasing the reset button is different each time. At a certain point, you can enter the simulation or download program. The board will return to normal. But it should be noted that you must avoid the configuration of GPIO13\GPIO14 in the program.

Summarize:

GPIO13\GPIO14 are configured in the program.

I used a multimeter to measure the reset pin of the STM32F051R8T6 on the target board. When I clicked on the simulation, there was a momentary level change. I analyzed that it should be the reset action of the target board, but why is the configuration status of GPIOA not reset? There is one thing I don't understand. The manual says that the value of GPIOA_MODER after reset is: 0x2800 0000, that is, GPIO13\14 is configured as multiplexing mode, but why does the program configure GPIO13\14 as output and cause the SWD simulation and download problems when the target chip is reset?

Keywords：KEIL target connected Reference address：How to solve the problem of "No target connected" when KEIL is displayed

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