nrf: Change types to size_t for all uses of mp_obj_str_get_data.

ports/nrf/boards/microbit/modules/microbitdisplay.c

@@ -90,7 +90,7 @@ mp_obj_t microbit_display_show_func(mp_uint_t n_args, const mp_obj_t *pos_args,
 
     if (mp_obj_is_str(image)) {
         // arg is a string object
-        mp_uint_t len;
+        size_t len;
         const char *str = mp_obj_str_get_data(image, &len);
         if (len == 0) {
             // There are no chars; do nothing.
@@ -297,7 +297,7 @@ static void draw_object(mp_obj_t obj) {
     } else if (mp_obj_get_type(obj) == &microbit_image_type) {
         microbit_display_show(display, (microbit_image_obj_t *)obj);
     } else if (mp_obj_is_str(obj)) {
-        mp_uint_t len;
+        size_t len;
         const char *str = mp_obj_str_get_data(obj, &len);
         if (len == 1) {
             microbit_display_show(display, microbit_image_for_char(str[0]));
@@ -415,7 +415,7 @@ mp_obj_t microbit_display_scroll_func(mp_uint_t n_args, const mp_obj_t *pos_args
     microbit_display_obj_t *self = (microbit_display_obj_t*)pos_args[0];
     mp_arg_val_t args[MP_ARRAY_SIZE(scroll_allowed_args)];
     mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(scroll_allowed_args), scroll_allowed_args, args);
-    mp_uint_t len;
+    size_t len;
     const char* str = mp_obj_str_get_data(args[0].u_obj, &len);
     mp_obj_t iterable = scrolling_string_image_iterable(str, len, args[0].u_obj, args[3].u_bool /*monospace?*/, args[4].u_bool /*loop*/);
     microbit_display_animate(self, iterable, args[1].u_int /*delay*/, false/*clear*/, args[2].u_bool/*wait?*/);

ports/nrf/boards/microbit/modules/microbitimage.c

@@ -216,7 +216,7 @@ STATIC mp_obj_t microbit_image_make_new(const mp_obj_type_t *type_in, mp_uint_t
         case 1: {
             if (mp_obj_is_str(args[0])) {
                 // arg is a string object
-                mp_uint_t len;
+                size_t len;
                 const char *str = mp_obj_str_get_data(args[0], &len);
                 // make image from string
                 if (len == 1) {
@@ -880,7 +880,7 @@ static mp_obj_t string_image_facade_subscr(mp_obj_t self_in, mp_obj_t index_in,
     if (value == MP_OBJ_SENTINEL) {
         // Fill in image
         string_image_facade_t *self = (string_image_facade_t *)self_in;
-        mp_uint_t len;
+        size_t len;
         const char *text = mp_obj_str_get_data(self->string, &len);
         mp_uint_t index = mp_get_index(self->base.type, len, index_in, false);
         microbit_image_set_from_char(self->image, text[index]);
@@ -935,7 +935,7 @@ mp_obj_t microbit_string_facade(mp_obj_t string) {
 
 static mp_obj_t microbit_facade_iter_next(mp_obj_t iter_in) {
     facade_iterator_t *iter = (facade_iterator_t *)iter_in;
-    mp_uint_t len;
+    size_t len;
     const char *text = mp_obj_str_get_data(iter->string, &len);
     if (iter->index >= len) {
         return MP_OBJ_STOP_ITERATION;

ports/nrf/modules/music/modmusic.c

@@ -126,7 +126,7 @@ void microbit_music_tick(void) {
             music_data->async_state = ASYNC_MUSIC_STATE_NEXT_NOTE;
         } else {
             // a note
-            mp_uint_t note_len;
+            size_t note_len;
             const char *note_str = mp_obj_str_get_data(note, &note_len);
             uint32_t delay_on = start_note(note_str, note_len, music_data->async_pin);
             music_data->async_wait_ticks = ticks + delay_on;

ports/nrf/modules/uos/microbitfs.c

@@ -377,7 +377,7 @@ STATIC file_descriptor_obj *microbit_file_descriptor_new(uint8_t start_chunk, bo
 }
 
 STATIC mp_obj_t microbit_remove(mp_obj_t filename) {
-    mp_uint_t name_len;
+    size_t name_len;
     const char *name = mp_obj_str_get_data(filename, &name_len);
     mp_uint_t index = microbit_find_file(name, name_len);
     if (index == 255) {
@@ -487,7 +487,7 @@ STATIC mp_obj_t microbit_file_list(void) {
 }
 
 STATIC mp_obj_t microbit_file_size(mp_obj_t filename) {
-    mp_uint_t name_len;
+    size_t name_len;
     const char *name = mp_obj_str_get_data(filename, &name_len);
     uint8_t chunk = microbit_find_file(name, name_len);
     if (chunk == 255) {
@@ -659,7 +659,7 @@ mp_obj_t uos_mbfs_open(size_t n_args, const mp_obj_t *args) {
     int read = -1;
     int text = -1;
     if (n_args == 2) {
-        mp_uint_t len;
+        size_t len;
         const char *mode = mp_obj_str_get_data(args[1], &len);
         for (mp_uint_t i = 0; i < len; i++) {
             if (mode[i] == 'r' || mode[i] == 'w') {
@@ -677,7 +677,7 @@ mp_obj_t uos_mbfs_open(size_t n_args, const mp_obj_t *args) {
             }
         }
     }
-    mp_uint_t name_len;
+    size_t name_len;
     const char *filename = mp_obj_str_get_data(args[0], &name_len);
     file_descriptor_obj *res = microbit_file_open(filename, name_len, read == 0, text == 0);
     if (res == NULL) {