define the function to go in bootloader and moved in a separate heade…

…r boot.h

cores/arduino/boot.cpp

@@ -0,0 +1,12 @@
+#include "boot.h"
+
+
+/* call this function when you want to force the board to go in bootloader */
+void goBootloader() {
+   R_SYSTEM->PRCR = (uint16_t) BSP_PRV_PRCR_PRC1_UNLOCK;
+   BOOT_DOUBLE_TAP_DATA = DOUBLE_TAP_MAGIC;
+   R_SYSTEM->PRCR = (uint16_t) BSP_PRV_PRCR_LOCK;
+   ((R_USB_FS0_Type*)R_USB_FS0_BASE)->SYSCFG_b.DPRPU = 0;
+   NVIC_SystemReset();
+   while (1); // WDT will fire here
+}

cores/arduino/boot.h

@@ -0,0 +1,21 @@
+#include "Arduino.h"
+
+#ifndef BOOTLOADER_INCLUDE_H
+#define BOOTLOADER_INCLUDE_H
+
+/* Key code for writing PRCR register. */
+#define BSP_PRV_PRCR_KEY                 (0xA500U)
+#define BSP_PRV_PRCR_PRC1_UNLOCK          ((BSP_PRV_PRCR_KEY) | 0x2U)
+#define BSP_PRV_PRCR_LOCK                ((BSP_PRV_PRCR_KEY) | 0x0U)
+
+#ifdef NO_BACKUP_REGISTERS
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *)0x20007FF0))
+#else
+#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *) &R_SYSTEM->VBTBKR[0]))
+#endif
+#define DOUBLE_TAP_MAGIC                  0x07738135
+
+
+/* call this function when you want to force the board to go in bootloader */
+void goBootloader();
+#endif

cores/arduino/usb/SerialUSB.cpp

@@ -1,6 +1,6 @@
-
 #include "SerialUSB.h"
 #include "tusb.h"
+#include "boot.h"
 
 #ifndef DISABLE_USB_SERIAL
 // Ensure we are installed in the USB chain
@@ -133,17 +133,7 @@ _SerialUSB::operator bool() {
     return rv;
 }
 
-/* Key code for writing PRCR register. */
-#define BSP_PRV_PRCR_KEY	              (0xA500U)
-#define BSP_PRV_PRCR_PRC1_UNLOCK          ((BSP_PRV_PRCR_KEY) | 0x2U)
-#define BSP_PRV_PRCR_LOCK	              ((BSP_PRV_PRCR_KEY) | 0x0U)
 
-#ifdef NO_BACKUP_REGISTERS
-#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *)0x20007FF0))
-#else
-#define BOOT_DOUBLE_TAP_DATA              (*((volatile uint32_t *) &R_SYSTEM->VBTBKR[0]))
-#endif
-#define DOUBLE_TAP_MAGIC                  0x07738135
 
 int _SerialUSB::_bps, _SerialUSB::_bits, _SerialUSB::_parity, _SerialUSB::_stop;
 bool _SerialUSB::_dtr, _SerialUSB::_rts;
@@ -154,12 +144,7 @@ static void CheckSerialReset() {
     #endif
 
     if ((_SerialUSB::_bps == 1200) && (! _SerialUSB::_dtr)) {
-        R_SYSTEM->PRCR = (uint16_t) BSP_PRV_PRCR_PRC1_UNLOCK;
-        BOOT_DOUBLE_TAP_DATA = DOUBLE_TAP_MAGIC;
-        R_SYSTEM->PRCR = (uint16_t) BSP_PRV_PRCR_LOCK;
-        ((R_USB_FS0_Type*)R_USB_FS0_BASE)->SYSCFG_b.DPRPU = 0;
-        NVIC_SystemReset();
-        while (1); // WDT will fire here
+        goBootloader();
     }
 }
 
@@ -223,4 +208,4 @@ void arduino::serialEventRun(void) {
     if (serialEvent && SerialUSB.available()) {
         serialEvent();
     }
-}
+}