Merge pull request #433 from HiFiPhile/sof

Disable SOF in dcd_stm32_fsdev

src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c

@@ -144,6 +144,12 @@
 #  define DCD_STM32_BTABLE_LENGTH (PMA_LENGTH - DCD_STM32_BTABLE_BASE)
 #endif
 
+// Since TinyUSB doesn't use SOF for now, and this interrupt too often (1ms interval)
+// We disable SOF for now until needed later on
+#ifndef USE_SOF
+#  define USE_SOF     0
+#endif
+
 /***************************************************
  * Checks, structs, defines, function definitions, etc.
  */
@@ -235,7 +241,7 @@ void dcd_init (uint8_t rhport)
     pcd_set_endpoint(USB,i,0u);
   }
 
-  USB->CNTR |= USB_CNTR_RESETM | USB_CNTR_SOFM | USB_CNTR_ESOFM | USB_CNTR_CTRM | USB_CNTR_SUSPM | USB_CNTR_WKUPM;
+  USB->CNTR |= USB_CNTR_RESETM | (USE_SOF ? USB_CNTR_SOFM : 0) | USB_CNTR_ESOFM | USB_CNTR_CTRM | USB_CNTR_SUSPM | USB_CNTR_WKUPM;
   dcd_handle_bus_reset();
   
   // Data-line pull-up is left disconnected.
@@ -542,10 +548,12 @@ void dcd_int_handler(uint8_t rhport) {
     dcd_event_bus_signal(0, DCD_EVENT_SUSPEND, true);
   }
 
+#if USE_SOF
   if(int_status & USB_ISTR_SOF) {
     reg16_clear_bits(&USB->ISTR, USB_ISTR_SOF);
     dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
   }
+#endif 
 
   if(int_status & USB_ISTR_ESOF) {
     if(remoteWakeCountdown == 1u)