Such as title, STM32F407 via USB HS plus external PHY USB3300, to write data, USB drive directly on the electric operation can't write data to the U dish, hardware simulation (keil MDK) environment, discovery is Appli_state couldn't enter the APPLICATION_READY (with cube mx generated program, used should know) only to the state, once, once in a while, after hardware emulation environment manual step several times while (1) cycle, then click the run at full speed, it can into the ready!!! Inquire about