1. The microcontroller stm32l052c6t6 is flashed through jtag. The microcontroller with the downloaded firmware through jtag transmits and receives data on uart1 and the LED flashes.
2. After switching to boot mode, the LED goes out, but the microcontroller is not flushed through uart1.
3. On the oscillogram there is a request to the microcontroller 0x7f, but the microcontroller does not respond
4. apply the scheme