I build a uC/OS project with keil5.12 , and my cpu is stm32f429zi serial .I am using STMicroelectronics STM32F429Discovery board . when i want to DEBUG , keil also become no response , but i can download to the board by j-link . The program can run correctly on board, but i want to DEBUG.what should i do to avoid this situation , If necessary i can provide the project.Please help me!!!