1 files changed, 26 insertions, 0 deletions
diff --git a/supervisor/shared/filesystem.c b/supervisor/shared/filesystem.c
index 0ef978ef2..68c6f4749 100644
--- a/supervisor/shared/filesystem.c
+++ b/supervisor/shared/filesystem.c
@@ -37,6 +37,30 @@
 static mp_vfs_mount_t _mp_vfs;
 static fs_user_mount_t _internal_vfs;
 
+static volatile uint32_t filesystem_flush_interval_ms = CIRCUITPY_FILESYSTEM_FLUSH_INTERVAL_MS;
+volatile bool filesystem_flush_requested = false;
+
+void filesystem_background(void) {
+    if (filesystem_flush_requested) {
+        filesystem_flush();
+        filesystem_flush_requested = false;
+    }
+}
+
+inline void filesystem_tick(void) {
+    if (filesystem_flush_interval_ms == 0) {
+        // 0 means not turned on.
+        return;
+    }
+    if (filesystem_flush_interval_ms == 1) {
+        filesystem_flush_requested = true;
+        filesystem_flush_interval_ms = CIRCUITPY_FILESYSTEM_FLUSH_INTERVAL_MS;
+    } else {
+        filesystem_flush_interval_ms--;
+    }
+}
+
+
 static void make_empty_file(FATFS *fatfs, const char *path) {
     FIL fp;
     f_open(fatfs, &fp, path, FA_WRITE | FA_CREATE_ALWAYS);
@@ -91,6 +115,8 @@ void filesystem_init(bool create_allowed, bool force_create) {
 }
 
 void filesystem_flush(void) {
+    // Reset interval before next flush.
+    filesystem_flush_interval_ms = CIRCUITPY_FILESYSTEM_FLUSH_INTERVAL_MS;
     supervisor_flash_flush();
 }