fixed usb serial not working after reconnect (#2196)

* fixed usb serial not working after reconnect

* added restart for sd over usb disconnect

* improved usb serial fix

* fixed formatting

firmware/baseband/sd_over_usb/proc_sd_over_usb.cpp

@@ -22,13 +22,23 @@
 
 #include "ch.h"
 #include "hal.h"
+#include <libopencm3/lpc43xx/usb.h>
 
 extern "C" {
 void start_usb(void);
 void irq_usb(void);
 void usb_transfer(void);
 
+extern volatile bool scsi_running;
+
 CH_IRQ_HANDLER(Vector60) {
+    const uint32_t status = USB0_USBSTS_D & USB0_USBINTR_D;
+    if (status & USB0_USBSTS_D_SLI) {
+        // USB reset received.
+        if (scsi_running) {
+            LPC_RGU->RESET_CTRL[0] = (1 << 0);
+        }
+    }
     irq_usb();
 }
 }

firmware/baseband/sd_over_usb/sd_over_usb.c

@@ -23,7 +23,7 @@
 #include "sd_over_usb.h"
 #include "scsi.h"
 
-bool scsi_running = false;
+volatile bool scsi_running = false;
 
 usb_request_status_t report_max_lun(
     usb_endpoint_t* const endpoint,