[Horus] Attempt to fix the problem with some files after a massstorage session

radio/src/disk_cache.cpp

@@ -71,6 +71,11 @@ void DiskCacheBlock::free(DWORD sector, UINT count)
   }
 }
 
+void DiskCacheBlock::free()
+{
+  endSector = 0;
+}
+
 bool DiskCacheBlock::empty() const
 {
   return (endSector == 0);
@@ -84,6 +89,16 @@ DiskCache::DiskCache():
   blocks = new DiskCacheBlock[DISK_CACHE_BLOCKS_NUM];
 }
 
+void DiskCache::clear()
+{
+  lastBlock = 0;
+  stats.noHits = 0;
+  stats.noMisses = 0;
+  for (int n=0; n<DISK_CACHE_BLOCKS_NUM; ++n) {
+    blocks[n].free();
+  }
+}
+
 DRESULT DiskCache::read(BYTE drv, BYTE * buff, DWORD sector, UINT count)
 {
   // TODO: check if not caching first sectors would improve anything

radio/src/disk_cache.h

@@ -37,6 +37,7 @@ public:
   bool read(BYTE* buff, DWORD sector, UINT count);
   DRESULT fill(BYTE drv, BYTE* buff, DWORD sector, UINT count);
   void free(DWORD sector, UINT count);
+  void free();
   bool empty() const;
 
 private:
@@ -53,14 +54,15 @@ struct DiskCacheStats
 
 class DiskCache
 {
-public:
+  public:
     DiskCache();
-
     DRESULT read(BYTE drv, BYTE* buff, DWORD sector, UINT count);
     DRESULT write(BYTE drv, const BYTE* buff, DWORD sector, UINT count);
     const DiskCacheStats & getStats() const;
     int getHitRate() const;
-private:
+    void clear();
+    
+  private:
     DiskCacheStats stats;
     uint32_t lastBlock;
     DiskCacheBlock * blocks;

radio/src/targets/horus/diskio.cpp

@@ -308,6 +308,8 @@ void sdMount()
 {
   TRACE("sdMount");
   
+  diskCache.clear();
+  
   if (f_mount(&g_FATFS_Obj, "", 1) == FR_OK) {
     // call sdGetFreeSectors() now because f_getfree() takes a long time first time it's called
     sdGetFreeSectors();