User Activity

I am running USB in Mass Storage host mode. On connecting the device, USB FLASH stick, it takes around 20 seconds to change the Appli_Sate from APPLICATION_START to APPLICATION_READY in usb_host.c file. It is normal ? Can the time be reduced ?   Than...
Two devices A & B are communicating on UART. A sends data stream to B. B sends one byte data back to A to acknowldge that data has been received. I want to implement if A doesn't receive acknowledgement from B then it display Error message on LCD.Ple...
I am trying to implement application with password access and change option. Please suggest a way to store password/user data in flash memory. Are there any APIs or applicaiton note for more information? 
HelloI am trying to powerup external 8MHZ crystal on STM32F407VET6 MCU but it is completely dead. I run the LED bliking program using HSI, and it is working sucussfully. Boot 0 and Boot1 pins have been PD with 500 ohm.  I also run the same code to us...
I want to use STM32F407V in USB device MSC mode. The device has battery to run the MCU. To fetch data from device, it will be connected to LAPTOP by USB cable.Please confirm below configuration for schematic1) Connect PA9 to VBUS on USB connector,  p...