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jcphillips
Associate
July 17, 2026
Question

STLINK-V3MODS VCP + BRIDGE VCP get half throughput

  • July 17, 2026
  • 0 replies
  • 7 views

I’m having an issue with throughput on the STLINK-V3MODS VCP when used with the second BRIDGE UART.  If I set both the VCP and 2nd VCP for 115200 baud, I am only able to simultaneously send 5.76 KiB/s through each (half throughput).  If I use only the VCP at 115200, I’m able to send 11.52 KiB/s (full throughput).

I saw no mention of any such limitation in the documentation.  Am I doing something wrong?

STLINK-V3MODS firmware 3.17.11
Windows 11 version 25H2 (OS Build 26200.8875)