stmhal: Expose flash and SD card as proper objects with block protocol.

You can now create (singleton) objects representing the flash and SD
card, using:

    flash = pyb.Flash()
    sdcard = pyb.SDCard()

These objects provide the block protocol.

1 files changed, 82 insertions, 1 deletions

diff --git a/stmhal/storage.c b/stmhal/storage.c
index 29d373e60f..7bd55a2b20 100644
--- a/stmhal/storage.c
+++ b/stmhal/storage.c
@@ -26,9 +26,12 @@
 
 #include <stdint.h>
 #include <string.h>
-#include STM32_HAL_H
 
 #include "py/obj.h"
+#include "py/runtime.h"
+#include "lib/fatfs/ff.h"
+#include "extmod/fsusermount.h"
+
 #include "systick.h"
 #include "led.h"
 #include "flash.h"
@@ -306,3 +309,81 @@ bool storage_write_block(const uint8_t *src, uint32_t block) {
         return true;
     }
 }
+
+mp_uint_t storage_read_blocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
+    for (size_t i = 0; i < num_blocks; i++) {
+        if (!storage_read_block(dest + i * FLASH_BLOCK_SIZE, block_num + i)) {
+            return 1; // error
+        }
+    }
+    return 0; // success
+}
+
+mp_uint_t storage_write_blocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
+    for (size_t i = 0; i < num_blocks; i++) {
+        if (!storage_write_block(src + i * FLASH_BLOCK_SIZE, block_num + i)) {
+            return 1; // error
+        }
+    }
+    return 0; // success
+}
+
+/******************************************************************************/
+// MicroPython bindings
+//
+// Expose the flash as an object with the block protocol.
+
+// there is a singleton Flash object
+STATIC const mp_obj_base_t pyb_flash_obj = {&pyb_flash_type};
+
+STATIC mp_obj_t pyb_flash_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    // check arguments
+    mp_arg_check_num(n_args, n_kw, 0, 0, false);
+
+    // return singleton object
+    return (mp_obj_t)&pyb_flash_obj;
+}
+
+STATIC mp_obj_t pyb_flash_readblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_WRITE);
+    mp_uint_t ret = storage_read_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FLASH_BLOCK_SIZE);
+    return MP_OBJ_NEW_SMALL_INT(ret);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(pyb_flash_readblocks_obj, pyb_flash_readblocks);
+
+STATIC mp_obj_t pyb_flash_writeblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
+    mp_uint_t ret = storage_write_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FLASH_BLOCK_SIZE);
+    return MP_OBJ_NEW_SMALL_INT(ret);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(pyb_flash_writeblocks_obj, pyb_flash_writeblocks);
+
+STATIC mp_obj_t pyb_flash_ioctl(mp_obj_t self, mp_obj_t cmd_in, mp_obj_t arg_in) {
+    mp_int_t cmd = mp_obj_get_int(cmd_in);
+    switch (cmd) {
+        case 1: storage_init(); return MP_OBJ_NEW_SMALL_INT(0); // INIT
+        case 2: storage_flush(); return MP_OBJ_NEW_SMALL_INT(0); // DEINIT; TODO properly
+        case 3: storage_flush(); return MP_OBJ_NEW_SMALL_INT(0); // SYNC
+        case 4: return MP_OBJ_NEW_SMALL_INT(storage_get_block_count()); // SEC_COUNT
+        case 5: return MP_OBJ_NEW_SMALL_INT(storage_get_block_size()); // SEC_SIZE
+        default: return mp_const_none;
+    }
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(pyb_flash_ioctl_obj, pyb_flash_ioctl);
+
+STATIC const mp_map_elem_t pyb_flash_locals_dict_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR_readblocks), (mp_obj_t)&pyb_flash_readblocks_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_writeblocks), (mp_obj_t)&pyb_flash_writeblocks_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_ioctl), (mp_obj_t)&pyb_flash_ioctl_obj },
+};
+
+STATIC MP_DEFINE_CONST_DICT(pyb_flash_locals_dict, pyb_flash_locals_dict_table);
+
+const mp_obj_type_t pyb_flash_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Flash,
+    .make_new = pyb_flash_make_new,
+    .locals_dict = (mp_obj_t)&pyb_flash_locals_dict,
+};