port/fsdev: log error when USBFS clock divider has no match

Report an error through USB_LOG_ERR when SystemCoreClock does not match
any supported 48/96/144/192/240 MHz divider case, instead of silently
leaving the USBFS prescaler unconfigured.

1 files changed, 2 insertions, 0 deletions

diff --git a/port/fsdev/usb_glue_nation.c b/port/fsdev/usb_glue_nation.c
index ef190dd8..0ab539a2 100644
--- a/port/fsdev/usb_glue_nation.c
+++ b/port/fsdev/usb_glue_nation.c
@@ -100,6 +100,8 @@ static void Set_USBClock(void)
         break;
 
     default:
+        USB_LOG_ERR("Unsupported system clock %u Hz for USBFS 48 MHz clock (supported: 48/96/144/192/240 MHz)\r\n",
+                    (unsigned int)SystemCoreClock);
         break;
     }
 }