Updated reboot strategy for SU1

module_usb_audio/reboot.xc

@@ -1,6 +1,7 @@
 #include <xs1.h>
 #include <platform.h>
 #include <xs1_su.h>
+#include <print.h>
 
 #define XS1_SU_PERIPH_USB_ID 0x1
 
@@ -10,8 +11,13 @@ void device_reboot_implementation(chanend spare)
 #ifdef ARCH_S
     /* Disconnect from bus */
     unsigned data[] = {4};
+    unsigned x;
     write_periph_32(xs1_su, XS1_SU_PERIPH_USB_ID, XS1_SU_PER_UIFM_FUNC_CONTROL_NUM, 1, data);
-#endif
+
+    /* Ideally we would reset SU1 here but then we loose power to the xcore and therefore the DFU flag */
+    /* Disable USB and issue reset to xcore only - not analogue chip */
+    write_node_config_reg(xs1_su, XS1_SU_CFG_RST_MISC_NUM,0b10);
+#else
 
     outct(spare, XS1_CT_END);   // have to do this before freeing the chanend
     inct(spare);                // Receive end ct from usb_buffer to close down in both directions
@@ -28,4 +34,6 @@ void device_reboot_implementation(chanend spare)
        write_sswitch_reg_no_ack(tile_id^0x8000, 6, pllVal);
        write_sswitch_reg_no_ack(tile_id, 6, pllVal);
     }
+#endif
+
 }