Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/ATSAM4S4B/UDP/RST_EP#0x0
Reset Endpoint Register
Reset Endpoint 0
Reset Endpoint 1
Reset Endpoint 2
Reset Endpoint 3
Reset Endpoint 4
Reset Endpoint 5
Reset Endpoint 6
Reset Endpoint 7
https://github.com/cmsis-svd/cmsis-svd-data