Merge pull request #76 from LechevSpace/skip-wait-init-sequence

Author: thejpster

src/controller.rs

@@ -397,6 +397,8 @@ where
             _ => {
                 // Safe to unwrap, since we actually have an entry if we got here
                 let dir_entry = dir_entry.unwrap();
+                // FIXME: if 2 files are in the same cluster this will cause an error when opening
+                // a file for a first time in a different than `ReadWriteCreate` mode.
                 self.open_dir_entry(volume, dir_entry, mode)
             }
         }

src/sdmmc.rs

@@ -193,6 +193,11 @@ where
                     Err(Error::TimeoutCommand(0)) => {
                         // Try again?
                         warn!("Timed out, trying again..");
+                        // Try flushing the card as done here: https://github.com/greiman/SdFat/blob/master/src/SdCard/SdSpiCard.cpp#L170,
+                        // https://github.com/rust-embedded-community/embedded-sdmmc-rs/pull/65#issuecomment-1270709448
+                        for _ in 0..0xFF {
+                            s.send(0xFF)?;
+                        }
                         attempts -= 1;
                     }
                     Err(e) => {
@@ -299,7 +304,10 @@ where
 
     /// Perform a command.
     fn card_command(&self, command: u8, arg: u32) -> Result<u8, Error> {
-        self.wait_not_busy()?;
+        if command != CMD0 && command != CMD12 {
+            self.wait_not_busy()?;
+        }
+
         let mut buf = [
             0x40 | command,
             (arg >> 24) as u8,