Fix SDIO buffer alignment (#21396)

3 years ago · e9618f1ba2
1 changed files with 6 additions and 1 deletions
--- 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  {