support for nano33iot without breaking legacy

libraries/SDU/extras/SDUBoot/Board.h

@@ -0,0 +1,51 @@
+/*
+  Copyright (c) 2021 Arduino LLC.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BOARD_H_INCLUDED
+#define _BOARD_H_INCLUDED
+
+
+/*SDU_SIZE is not specifically for nano 33 iot but it's core version dependent.
+  From 1.8.11 the core footprint is too big to fit 0x4000.
+  If you need to recompile SDUBoot.ino for */
+
+
+#ifdef ARDUINO_SAM_ZERO
+#define SDU_START    0x4000
+#else
+#define SDU_START    0x2000
+#endif
+#if defined(ARDUINO_SAMD_NANO_33_IOT)
+#define SDU_SIZE  0x6000
+#else
+#define SDU_SIZE  0x4000
+#endif
+
+#define SKETCH_START (uint32_t*)(SDU_START + SDU_SIZE)
+
+#define UPDATE_FILE "UPDATE.BIN"
+
+#if defined(USE_ARDUINO_MKR_PIN_LAYOUT)
+#ifndef SDCARD_SS_PIN
+#define SDCARD_SS_PIN 4
+#endif
+#else
+#define SDCARD_SS_PIN 10
+#endif
+
+#endif

libraries/SDU/extras/SDUBoot/SDUBoot.ino

@@ -15,25 +15,10 @@
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
-
+#include "Board.h"
 #include <SD.h>
 #include <FlashStorage.h>
 
-#ifdef ARDUINO_SAM_ZERO
-#define SDU_START    0x4000
-#else
-#define SDU_START    0x2000
-#endif
-#define SDU_SIZE     0x4000
-
-#define SKETCH_START (uint32_t*)(SDU_START + SDU_SIZE)
-
-#ifndef SDCARD_SS_PIN
-#define SDCARD_SS_PIN 4
-#endif
-
-#define UPDATE_FILE "UPDATE.BIN"
-
 FlashClass flash;
 
 // Initialize C library
@@ -93,5 +78,3 @@ int main() {
   // jump to reset handler
   asm("bx %0"::"r"(resetHandlerAddress));
 }
-
-

libraries/SDU/src/SDU.cpp

@@ -17,11 +17,10 @@
 */
 
 #include <Arduino.h>
-
 #include "SDU.h"
 
 __attribute__ ((section(".sketch_boot")))
-unsigned char sduBoot[0x4000] = {
+unsigned char sduBoot[SDU_SIZE] = {
 #if defined(ARDUINO_SAMD_ZERO)
   #include "boot/zero.h"
 #elif defined(ARDUINO_SAMD_MKR1000)
@@ -40,6 +39,8 @@ unsigned char sduBoot[0x4000] = {
   #include "boot/mkrnb1500.h"
 #elif defined(ARDUINO_SAM_ZERO)
   #include "boot/mzero.h"
+#elif defined(ARDUINO_SAMD_NANO_33_IOT)
+  #include "boot/nano33iot.h"
 #else
   #error "Unsupported board!"
 #endif

libraries/SDU/src/SDU.h

@@ -18,7 +18,5 @@
 
 #ifndef _SDU_H_INCLUDED
 #define _SDU_H_INCLUDED
-
-// nothing for now
-
+#include "../extras/Board.h"
 #endif