Add basic support for ED64 X series

Only loads ROM's

Makefile

@@ -30,6 +30,7 @@ SRCS = \
 	flashcart/64drive/64drive.c \
 	flashcart/flashcart_utils.c \
 	flashcart/flashcart.c \
+	flashcart/ed64x/ed64x.c \
 	flashcart/sc64/sc64_ll.c \
 	flashcart/sc64/sc64.c \
 	libs/libspng/spng/spng.c \

src/flashcart/ed64x/ed64x.c

@@ -0,0 +1,160 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <fatfs/ff.h>
+#include <libdragon.h>
+
+#include "utils/fs.h"
+#include "utils/utils.h"
+
+#include "../flashcart_utils.h"
+#include "ed64x_ll.h"
+#include "ed64x.h"
+
+typedef enum {
+    ED64_X5 = 5,
+    ED64_X7 = 7,
+    ED64_UKNOWN = 0,
+} ed64x_device_variant_t;
+
+/* ED64 save location base address  */
+#define SRAM_ADDRESS (0xA8000000)
+/* ED64 ROM location base address  */
+#define ROM_ADDRESS  (0xB0000000)
+
+static flashcart_err_t ed64x_init (void) {
+
+    return FLASHCART_OK;
+}
+
+static flashcart_err_t ed64x_deinit (void) {
+
+    return FLASHCART_OK;
+}
+
+static ed64x_device_variant_t get_cart_model() {
+    // Currently either X5 or X7
+    return true; // FIXME: check cart model.
+}
+
+static bool ed64x_has_feature (flashcart_features_t feature) {
+    bool is_model_x7 = get_cart_model(); 
+    switch (feature) {
+        case FLASHCART_FEATURE_RTC: return is_model_x7 ? true : false;
+        case FLASHCART_FEATURE_USB: return is_model_x7 ? true : false;
+        case FLASHCART_FEATURE_AUTO_CIC: return true;
+        case FLASHCART_FEATURE_64DD: return false;
+        default: return false;
+    }
+}
+
+static flashcart_err_t ed64x_load_rom (char *rom_path, flashcart_progress_callback_t *progress) {
+    FIL fil;
+    UINT br;
+
+    if (f_open(&fil, strip_fs_prefix(rom_path), FA_READ) != FR_OK) {
+        return FLASHCART_ERR_LOAD;
+    }
+
+    fatfs_fix_file_size(&fil);
+
+    size_t rom_size = f_size(&fil);
+
+    if (rom_size > MiB(64)) {
+        f_close(&fil);
+        return FLASHCART_ERR_LOAD;
+    }
+
+    size_t sdram_size = MiB(64);
+
+    size_t chunk_size = KiB(128);
+    for (int offset = 0; offset < sdram_size; offset += chunk_size) {
+        size_t block_size = MIN(sdram_size - offset, chunk_size);
+        if (f_read(&fil, (void *) (ROM_ADDRESS + offset), block_size, &br) != FR_OK) {
+            f_close(&fil);
+            return FLASHCART_ERR_LOAD;
+        }
+        if (progress) {
+            progress(f_tell(&fil) / (float) (f_size(&fil)));
+        }
+    }
+    if (f_tell(&fil) != rom_size) {
+        f_close(&fil);
+        return FLASHCART_ERR_LOAD;
+    }
+
+    if (f_close(&fil) != FR_OK) {
+        return FLASHCART_ERR_LOAD;
+    }
+
+    return FLASHCART_OK;
+}
+
+static flashcart_err_t ed64x_load_file (char *file_path, uint32_t rom_offset, uint32_t file_offset) {
+    FIL fil;
+    UINT br;
+
+    if (f_open(&fil, strip_fs_prefix(file_path), FA_READ) != FR_OK) {
+        return FLASHCART_ERR_LOAD;
+    }
+
+    fatfs_fix_file_size(&fil);
+
+    size_t file_size = f_size(&fil) - file_offset;
+
+    if (file_size > (MiB(64) - rom_offset)) {
+        f_close(&fil);
+        return FLASHCART_ERR_ARGS;
+    }
+
+    if (f_lseek(&fil, file_offset) != FR_OK) {
+        f_close(&fil);
+        return FLASHCART_ERR_LOAD;
+    }
+
+    if (f_read(&fil, (void *) (ROM_ADDRESS + rom_offset), file_size, &br) != FR_OK) {
+        f_close(&fil);
+        return FLASHCART_ERR_LOAD;
+    }
+    if (br != file_size) {
+        f_close(&fil);
+        return FLASHCART_ERR_LOAD;
+    }
+
+    if (f_close(&fil) != FR_OK) {
+        return FLASHCART_ERR_LOAD;
+    }
+
+    return FLASHCART_OK;
+}
+
+static flashcart_err_t ed64x_load_save (char *save_path) {
+
+
+    return FLASHCART_OK;
+}
+
+static flashcart_err_t ed64x_set_save_type (flashcart_save_type_t save_type) {
+    
+
+    return FLASHCART_OK;
+}
+
+static flashcart_t flashcart_ed64x = {
+    .init = ed64x_init,
+    .deinit = ed64x_deinit,
+    .has_feature = ed64x_has_feature,
+    .load_rom = ed64x_load_rom,
+    .load_file = ed64x_load_file,
+    .load_save = ed64x_load_save,
+    .load_64dd_ipl = NULL,
+    .load_64dd_disk = NULL,
+    .set_save_type = ed64x_set_save_type,
+    .set_save_writeback = NULL,
+};
+
+
+flashcart_t *ed64x_get_flashcart (void) {
+    return &flashcart_ed64x;
+}

src/flashcart/ed64x/ed64x.h

@@ -0,0 +1,24 @@
+/**
+ * @file ed64x.h
+ * @brief ED64 Xseries flashcart support
+ * @ingroup flashcart 
+ */
+
+#ifndef FLASHCART_ED64X_H__
+#define FLASHCART_ED64X_H__
+
+
+#include "../flashcart.h"
+
+
+/**
+ * @addtogroup ED64_Xseries
+ * @{
+ */
+
+flashcart_t *ed64x_get_flashcart (void);
+
+/** @} */ /* ed64x */
+
+
+#endif

src/flashcart/ed64x/ed64x_ll.h

@@ -0,0 +1,14 @@
+/**
+ * @file ed64x_ll.h
+ * @brief ed64x flashcart low level access
+ * @ingroup flashcart
+ */
+
+#ifndef FLASHCART_ED64X_LL_H__
+#define FLASHCART_ED64X_LL_H__
+
+
+/** @} */ /* ed64x */
+
+
+#endif

src/flashcart/flashcart.c

@@ -11,6 +11,7 @@
 #include "flashcart_utils.h"
 
 #include "64drive/64drive.h"
+#include "ed64x/ed64x.h"
 #include "sc64/sc64.h"
 
 
@@ -108,10 +109,11 @@ flashcart_err_t flashcart_init (const char **storage_prefix) {
             flashcart = d64_get_flashcart();
             break;
 
-        case CART_EDX:  // Series X EverDrive-64
+        case CART_EDX:  // Official EverDrive 64 Series X 
+            flashcart = ed64x_get_flashcart();
             break;
 
-        case CART_ED:   // Original EverDrive-64
+        case CART_ED:   // Series V EverDrive-64 or clone
             break;
 
         case CART_SC:   // SummerCart64