moved read16 & write16 to helper funcs in fat16.c, removed from iface

fat16.c

@@ -57,6 +57,20 @@ bool find_empty_file_slot(FAT16_FILE* file);
 
 // =========== INTERNAL FUNCTION IMPLEMENTATIONS =========
 
+
+uint16_t read16(const BLOCKDEV* dev)
+{
+	uint16_t a;
+	dev->load(&a, 2);
+	return a;
+}
+
+
+void write16(const BLOCKDEV* dev, const uint16_t val)
+{
+	dev->store(&val, 2);
+}
+
 /** Find absolute address of first boot sector. Returns 0 on failure. */
 uint32_t find_bs(const BLOCKDEV* dev)
 {
@@ -139,14 +153,14 @@ void read_bs(const BLOCKDEV* dev, Fat16BootSector* info, const uint32_t addr)
 void write_fat(const FAT16* fat, const uint16_t cluster, const uint16_t value)
 {
 	fat->dev->seek(fat->fat_addr + (cluster * 2));
-	fat->dev->write16(value);
+	write16(fat->dev, value);
 }
 
 
 uint16_t read_fat(const FAT16* fat, const uint16_t cluster)
 {
 	fat->dev->seek(fat->fat_addr + (cluster * 2));
-	return fat->dev->read16();
+	return read16(fat->dev);
 }
 
 
@@ -418,11 +432,11 @@ void write_file_header(FAT16_FILE* file, const char* fname_raw, const uint8_t at
 	}
 
 	// addr of the first file cluster
-	dev->write16(clu_start);
+	write16(dev, clu_start);
 
 	// file size (uint32_t)
-	dev->write16(0);
-	dev->write16(0);
+	write16(dev, 0);
+	write16(dev, 0);
 
 	// reopen file - load & parse the information just written
 	open_file(file->fat, file, file->clu, file->num);

fat16.h

@@ -9,12 +9,8 @@ typedef struct
 	void (*store)(const void* src, const uint16_t len);
 	// Sequential byte write
 	void (*write)(const uint8_t b);
-	// Sequential 2-byte write
-	void (*write16)(const uint16_t b);
 	// Sequential byte read
 	uint8_t (*read)(void);
-	// Sequential 2-byte read
-	uint16_t (*read16)(void);
 	// Absolute seek
 	void (*seek)(const uint32_t);
 	// Relative seek

main.c

@@ -45,11 +45,6 @@ void test_write(const uint8_t b)
 	fwrite(&b, 1, 1, testf);
 }
 
-void test_write16(const uint16_t b)
-{
-	fwrite(&b, 2, 1, testf);
-}
-
 uint8_t test_read()
 {
 	uint8_t a;
@@ -57,21 +52,11 @@ uint8_t test_read()
 	return a;
 }
 
-uint16_t test_read16()
-{
-	uint16_t a;
-	fread(&a, 2, 1, testf);
-	return a;
-}
-
 void test_open()
 {
 	test.read = &test_read;
 	test.write = &test_write;
 
-	test.read16 = &test_read16;
-	test.write16 = &test_write16;
-
 	test.load = &test_load;
 	test.store = &test_store;