Add SBU_LoadLZSS.ino sketch + support for LZSS encoding

Author: giulcioffi

libraries/SBU/examples/SBU_LoadLZSS/SBU_LoadLZSS.ino

@@ -0,0 +1,83 @@
+#include <MKRNB.h>
+#include <SBU.h>
+#include <FlashStorage.h>
+
+#include "lzss.h"
+
+FlashClass mcu_flash;
+
+static char const BINARY[] =
+{
+#include "Binary.h"
+};
+
+static char const CHECK_FILE[] =
+{
+  "OK"
+};
+
+static constexpr char CHECK_FILE_NAME[] = "UPDATE.OK";
+constexpr char UPDATE_FILE_NAME[] = "UPDATE.BIN.LZSS";
+
+NBFileUtils fileUtils;
+bool update_available = false;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial) { }
+
+  unsigned long const start = millis();
+  for (unsigned long now = millis(); !Serial && ((now - start) < 5000); now = millis()) { };
+
+  Serial.print("Accessing SARA Filesystem... ");
+  if (!fileUtils.begin(false)) {
+    Serial.println("failed.");
+    return;
+
+  }
+  Serial.println("OK");
+
+  uint32_t bytes_to_write = sizeof(BINARY);
+  Serial.print("Size of BINARY.H: ");
+  Serial.println(bytes_to_write);
+
+  Serial.print("Encoding \"BINARY.H\" into \"UPDATE.BIN.LZSS\" and writing it into the Sara-R410M module ... ");
+
+  /*
+   * Set the lzss parameter in the following way:
+   * - 0, false          : you want to perform a LZSS encoding (.H -> .LZSS)
+   * - SKETCH_START, true: you want to perform a LZSS decoding (.LZSS -> .H)
+   */
+  lzss_init(0, false);
+  
+  //Encode into .lzss and write to the Sara modem
+  int bytes_written = lzss_encode(BINARY, bytes_to_write);
+
+  if (bytes_written == 0) {
+    Serial.println("something went wrong!");
+  } else {
+    Serial.println("OK!");
+  }
+
+  Serial.print("Size of UPDATE.BIN.LZSS: ");
+  Serial.println(bytes_written);
+
+  auto status = 0;
+  while (status != 2) {
+    status = fileUtils.createFile(CHECK_FILE_NAME, CHECK_FILE, 2);
+    delay(100);
+  }
+
+  Serial.println("Please type \"restart\" to apply the update");
+  update_available = true;
+}
+
+
+void loop() {
+  if (update_available == true) {
+    String command = Serial.readStringUntil('\n');
+    if (command.indexOf("restart") >= 0) {
+      NVIC_SystemReset();
+    }
+  }
+}

libraries/SBU/examples/SBU_LoadLZSS/lzss.cpp

@@ -0,0 +1 @@
+../../extras/SBUBoot/lzss.cpp

libraries/SBU/examples/SBU_LoadLZSS/lzss.h

@@ -0,0 +1 @@
+../../extras/SBUBoot/lzss.h

libraries/SBU/extras/SBUBoot/SBUBoot.ino

@@ -52,20 +52,20 @@ int main()
   // Try to update only if update file
   // has been download successfully.
 
-  if (fileUtils.existFile(CHECK_FILE_NAME)) 
+  if (fileUtils.listFile(CHECK_FILE_NAME)) 
   {
     /*This is for LZSS compressed binaries. */
-    if (fileUtils.existFile(UPDATE_FILE_NAME_LZSS)) 
+    if (fileUtils.listFile(UPDATE_FILE_NAME_LZSS)) 
     {
-      /* Erase the complete flash starting from the SSU forward
+      /* Erase the complete flash starting from the SBU forward
        * because we've got no possibility of knowing how large
        * the decompressed binary will finally be.
        */
       mcu_flash.erase((void*)SKETCH_START, 0x40000 - (uint32_t)SKETCH_START);
       /* Initialize the lzss module with the data which
        * it requires.
        */
-      lzss_init((uint32_t)SKETCH_START);
+      lzss_init((uint32_t)SKETCH_START, true);
       /* During the process of decoding UPDATE.BIN.LZSS
        * is decompressed and stored as UPDATE.BIN.
        */