Fix SDIO buffer alignment (MarlinFirmware#21396)

Tymek · Apr 26, 2021 · 4e57d26 · 4e57d26
1 parent bff4bd4
commit 4e57d26
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/Marlin/src/feature/binary_stream.h b/Marlin/src/feature/binary_stream.h
@@ -51,7 +51,12 @@ inline int bs_read_serial(const uint8_t index) {
 
 #if ENABLED(BINARY_STREAM_COMPRESSION)
   static heatshrink_decoder hsd;
-  static uint8_t decode_buffer[512] = {};
+  #ifdef BOTH(ARDUINO_ARCH_STM32F1, SDIO_SUPPORT)
+    // STM32 requires a word-aligned buffer for SD card transfers via DMA
+    static __attribute__((aligned(sizeof(size_t)))) uint8_t decode_buffer[512] = {};
+  #else
+    static uint8_t decode_buffer[512] = {};
+  #endif
 #endif
 
 class SDFileTransferProtocol  {