STM32F4 & F7 : How to speed up the data transmission in USB

[mohammed-ismail]

Posted on June 26, 2016 at 13:30

Hello everyone,

I'm actually using the Discovery F4 and F7 to understand and use the USB stack from ST,but actually I can't speed more than 400 kB/s with the F4 (Full-Speed USB) and 2.1 MB/s with the F7 (ULPI HS USB). I'm using the CDC class and examples. (for the F7 i'm using the Keil example.) I've already changed the EP FIFO and the send and receive buffer for the specific application,but it don't change anymore the speed. - For the F4 : I'm using example from this website : http://stm32f4-discovery.net/2015/08/hal-library-21-multi-purpose-usb-library-for-stm32fxxx/ My application needs a high performance transmission (In full-speed the objective is 1.3 MB/s and in High-speed 10 MB/s) but i don't know where to modify the code to speed up the speed of tranmission. Did someone achieve to have a good transmission  speed on the STM32 Discovery F7 or F4 ? Best Regards, Ismail

[Tesla DeLorean]

Posted on June 26, 2016 at 17:47

[DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/STM32F4%20%20F7%20%20How%20to%20speed%20up%20the%20data%20transmission%20in%20USB&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/AllItems.aspx&currentviews=12]dupe

Getting 1.3MBps from Full-Speed USB seems a little fanciful.