The SDU library for Uno R4

libraries/SDU/examples/Usage/Usage.ino

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+/*
+ Usage
+ This example demonstrates how to use the UNO R4 SDU library to update a
+ sketch on an Arduino UNO R4 (WiFi, Minima) board using an
+ SD card. It prints out the date and time the sketch was compiled at 
+ to both Serial and Serial1.
+
+ Circuit:
+ * Arduino UNO R4 Minima or WiFi board
+ * SD shield or breakout connected with CS pin of 4
+ * SD card
+
+ Non-Arduino UNO R4 board are NOT supported.
+ Steps to update sketch via SD card:
+
+ 1) Upload this sketch or another sketch that includes the SDU library
+    via #include <SDU.h>
+
+ 2) Update the sketch as desired. For this example the sketch prints out
+    the compiled date and time so no updates are needed.
+
+ 3) In the IDE select: Sketch -> Export Compiled Binary
+
+ 4) Copy the .bin file from the sketch's folder to the SD card and rename
+    the file to UPDATE.bin. Eject the SD card from your PC.
+
+ 5) Insert the SD card into the board, shield or breakout and press the
+    reset button or power cycle the board. The SDU library will then update
+    the sketch on the board with the contents of UPDATE.bin
+
+ created 23 March 2017
+ by Sandeep Mistry
+*/
+
+/*
+ Include the SDU library 
+
+ This will add some code to the sketch before setup() is called
+ to check if an SD card is present and UPDATE.bin exists on the
+ SD card.
+
+ If UPDATE.bin is present, the file is used to update the sketch
+ running on the board. After this UPDATE.bin is deleted from the
+ SD card.
+*/
+#include <SDU.h>
+
+String message;
+
+void setup() {
+  Serial.begin(115200);
+
+  // Wait for Serial Monitor connection
+  while (!Serial.available()) {
+    Serial.println("Send any key.");
+    delay(1000);
+  }
+
+  message += "Sketch compile date and time: ";
+  message += __DATE__;
+  message += " ";
+  message += __TIME__;
+
+  // print out the sketch compile date and time on the serial port
+  Serial.println(message);
+}
+
+void loop() {
+  // add you own code here
+}
+

libraries/SDU/extras/SDUBoot/SDUBoot.ino

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+/*
+ * This sketch is a modified version of the SDUBoot example from the SDU
+ * library in the Arduino SAMD core.
+ *
+ * SDUBoot.ino is converted with build.sh into HEX values in a .h file
+ * in 'boot' folder of the SDU library. The SDU library with support of
+ * the linker script inserts the binary representation of this sketch
+ * before the actual sketch. This way this sketch acts as a second stage
+ * bootloader always uploaded with the sketch's binary.
+ *
+ * To make this second stage bootloader as small as possible while it is
+ * still an Arduino sketch, it can't be built with standard boards
+ * configurations of UNO R4 Minima or Wifi.
+ * Additionally the libfsp.a is built without code flash writing support
+ * and this sketch needs it.
+ *
+ * I created a custom board definition to build this sketch to a binary
+ * size less than 0x6000 bytes.
+ * https://github.com/JAndrassy/my_boards/tree/master/renesas-uno
+ * The custom unor4_sdu variant has peripherals support removed with many
+ * 'HOWMANY' settings in pins_arduino.h set to 0 to make the SDUBoot sketch
+ * bin even smaller.
+ * The bin size reduction for libfsp.a and the sketch is described here
+ * https://github.com/arduino/ArduinoCore-renesas/discussions/118
+ */
+
+#include <SD.h>
+#include <r_flash_lp.h>
+
+#define SDU_START    0x4000
+#define SDU_SIZE    0x6000
+
+#define SKETCH_START (uint32_t*)(SDU_START + SDU_SIZE)
+
+#ifndef SDCARD_SS_PIN
+#define SDCARD_SS_PIN 4
+#endif
+
+#define UPDATE_FILE "UPDATE.BIN"
+
+flash_lp_instance_ctrl_t ctrl;
+flash_cfg_t cfg;
+
+void stopAgt(); //add to core/time.cpp as { main_timer.close();}
+
+void setup() {
+
+  delay(1);
+
+  if (SD.begin(SDCARD_SS_PIN) && SD.exists(UPDATE_FILE)) {
+
+    File updateFile = SD.open(UPDATE_FILE);
+    uint32_t updateSize = updateFile.size();
+    bool updateFlashed = false;
+
+    if (updateSize > SDU_SIZE) {
+      // skip the SDU section
+      updateFile.seek(SDU_SIZE);
+      updateSize -= SDU_SIZE;
+
+      cfg.data_flash_bgo = false;
+      cfg.p_callback = nullptr;
+      cfg.p_context = nullptr;
+      cfg.ipl = (BSP_IRQ_DISABLED);
+      cfg.irq = FSP_INVALID_VECTOR;
+
+      fsp_err_t rv = R_FLASH_LP_Open(&ctrl, &cfg);
+      if (rv == FSP_SUCCESS) {
+
+        uint32_t flashAddress = (uint32_t) SKETCH_START;
+
+        // erase the pages
+        __disable_irq();
+        rv = R_FLASH_LP_Erase(&ctrl, flashAddress, (updateSize / BSP_FEATURE_FLASH_LP_CF_BLOCK_SIZE) + 1);
+        __enable_irq();
+        if (rv == FSP_SUCCESS) {
+
+          uint8_t buffer[32 * BSP_FEATURE_FLASH_LP_CF_WRITE_SIZE];
+
+          // write the pages
+          for (uint32_t i = 0; i < updateSize; i += sizeof(buffer)) {
+            updateFile.read(buffer, sizeof(buffer));
+            __disable_irq();
+            R_FLASH_LP_Write(&ctrl, (uint32_t) &buffer, flashAddress, sizeof(buffer));
+            __enable_irq();
+            flashAddress += sizeof(buffer);
+          }
+
+          updateFlashed = true;
+        }
+
+        R_FLASH_LP_Close(&ctrl);
+      }
+
+      updateFile.close();
+
+      if (updateFlashed) {
+        SD.remove(UPDATE_FILE);
+      }
+    }
+  }
+
+  stopAgt();
+
+  SysTick->CTRL = 0;
+
+  // Disable MSP monitoring.
+  R_MPU_SPMON->SP[0].CTL = 0;
+
+  // jump to the sketch
+  __set_MSP(*SKETCH_START);
+
+  //Reset vector table address
+  SCB->VTOR = ((uint32_t) (SKETCH_START ) & SCB_VTOR_TBLOFF_Msk);
+
+  // address of Reset_Handler is written by the linker at the beginning of the .text section (see linker script)
+  uint32_t resetHandlerAddress = (uint32_t) *(SKETCH_START + 1);
+  // jump to reset handler
+  asm("bx %0"::"r"(resetHandlerAddress));
+}
+
+void loop() {
+}

libraries/SDU/extras/SDUBoot/build.sh

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+#!/bin/sh -x
+
+ARDUINO=arduino-cli
+SKETCH_NAME="SDUBoot.ino"
+SKETCH="$PWD/$SKETCH_NAME"
+BUILD_PATH="$PWD/build"
+OUTPUT_PATH="../../src/boot"
+
+buildSDUBootSketch() {
+	BOARD=$1
+	DESTINATION=$2
+
+	$ARDUINO compile -b $BOARD --output-dir="$BUILD_PATH" "$SKETCH"
+	cat "$BUILD_PATH/$SKETCH_NAME.bin" | xxd -i > $DESTINATION
+	rm -rf "$BUILD_PATH"
+}
+
+mkdir -p "$OUTPUT_PATH"
+
+buildSDUBootSketch "my_boards:renesas_uno:unor4_sdu" "$OUTPUT_PATH/unor4.h"
+

libraries/SDU/library.properties

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+name=SDU
+version=1.0.0
+author=Arduino
+maintainer=Arduino <[email protected]>
+sentence=Update the sketch on your board from an SD card
+paragraph=Requires an SD card
+category=Other
+url=http://www.arduino.cc/en/Reference/SDU
+architectures=renesas,renesas_uno

libraries/SDU/src/SDU.cpp

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+/*
+  Copyright (c) 2017 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
+*/
+
+#include <Arduino.h>
+
+#include "SDU.h"
+
+__attribute__ ((section(".sketch_boot")))
+unsigned char sduBoot[0x6000] = {
+#if defined(ARDUINO_ARCH_RENESAS_UNO)
+  #include "boot/unor4.h"
+#else
+  #error "Unsupported board!"
+#endif
+};

libraries/SDU/src/SDU.h

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+/*
+  Copyright (c) 2017 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 _SDU_H_INCLUDED
+#define _SDU_H_INCLUDED
+
+// nothing for now
+
+#endif