Minor fixes.

Author: xC0000005

cores/arduino/board.h

@@ -10,6 +10,7 @@
 #include "clock.h"
 #include "core_callback.h"
 #include "digital_io.h"
+#include "dma.h"
 #include "dwt.h"
 #include "hw_config.h"
 #include "low_power.h"

libraries/DMA/src/DMATransfer.cpp

@@ -8,16 +8,20 @@
   */
 void DMATransferClass::prepare(dmatransfer_t *settings) {
   if (!_prepared) {
+    // TODO - figure out which DMA to enable the clock for.
     __HAL_RCC_DMA1_CLK_ENABLE();
+    
+    memcpy(&_transfer_settings, settings, sizeof(dmatransfer_t));
 
-    _transfer_settings.dma_settings.Init.Direction = DMA_MEMORY_TO_PERIPH;
+    _transfer_settings.dma_settings.Init.Direction = transfer_direction;
     _transfer_settings.dma_settings.Init.PeriphInc = DMA_PINC_DISABLE;
     _transfer_settings.dma_settings.Init.MemInc = DMA_MINC_DISABLE;
     _transfer_settings.dma_settings.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
     _transfer_settings.dma_settings.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
     _transfer_settings.dma_settings.Init.Mode = settings.circular ? DMA_CIRCULAR : DMA_NORMAL;
     _transfer_settings.dma_settings.Init.Priority = DMA_PRIORITY_VERY_HIGH;
     _transfer_settings.dma_settings.Instance = settings.channel_stream;
+    // TODO - intialize the callbacks.
 
     // Perform HAL Initialization first.
     HAL_DMA_Init(&dmaUpdate);

libraries/DMA/src/DMATransfer.h

@@ -17,6 +17,7 @@ struct dmatransfer_s {
      */
   DMA_HandleTypeDef *dma_settings;
   DMA_CS_Selection channel_stream;
+  uint32_t transfer_direction;
   boolean circular;
   void (*transferComplete)(DMA_HandleTypeDef *);
   void (*transferHalfComplete)(DMA_HandleTypeDef *);