Envie: port doom :)

Need to preflash utils/doom.fat.dump in external QSPI with

/home/martino/.arduino15/packages/arduino/tools/dfu-util/0.9.0-arduino1/dfu-util --device 0x2341:0x005b -a1 -D utils/doom.fat.dump --dfuse-address=0x90000000

Author: facchinm

examples/Doom/Doom.ino

@@ -0,0 +1,43 @@
+#include "QSPIFBlockDevice.h"
+#include "FATFileSystem.h"
+#include "doomgeneric.h"
+
+QSPIFBlockDevice block_device(PD_11, PD_12, PF_7, PD_13,
+                              PF_10, PG_6, QSPIF_POLARITY_MODE_1, MBED_CONF_QSPIF_QSPI_FREQ);
+
+mbed::FATFileSystem fs("fs");
+
+extern "C" int main_wrapper(int argc, char **argv);
+char*argv[] = {"/fs/doom", "-iwad", "/fs/DOOM1.WAD"};
+
+void setup() {
+  // put your setup code here, to run once:
+  delay(2000);
+  int err =  fs.mount(&block_device);
+  if (err) {
+    // Reformat if we can't mount the filesystem
+    // this should only happen on the first boot
+    printf("No filesystem found, formatting... ");
+    fflush(stdout);
+    err = fs.reformat(&block_device);
+  }
+  DIR *dir;
+  struct dirent *ent;
+  printf("try to open dir\n");
+  if ((dir = opendir("/fs")) != NULL) {
+    /* print all the files and directories within directory */
+    while ((ent = readdir (dir)) != NULL) {
+      printf ("%s\n", ent->d_name);
+    }
+    closedir (dir);
+  } else {
+    /* could not open directory */
+    printf ("error\n");
+  }
+  main_wrapper(3, argv);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}