fixed sai redefinition issues (#29)

* fixed stm32h7xx_hal.h dependendy issue

Also changed all imports from hal with double quotes to angle brackets. This should indicate the source of these imports a little better (i.e. not local files).

This addresses the problem raised in #27.

The example sketches build fine on my system (Linux / Ubuntu), and I doubt any other users will encounter platform-specific issues.

* removed temporary caching fix

src/utility/audio.cpp

@@ -444,12 +444,6 @@ void AudioHandle::Impl::InternalCallback(int32_t* in, int32_t* out, size_t size)
             default: break;
         }
     }
-
-	//temporary bandaid until the cache fix is released via stm32duino
-	for(int i = 0; i < kAudioMaxChannels / 2; i++){
-		dsy_dma_invalidate_cache_for_buffer(dsy_audio_rx_buffer[i], kAudioMaxBufferSize);
-		dsy_dma_clear_cache_for_buffer(dsy_audio_tx_buffer[i], kAudioMaxBufferSize);
-	}
 
 }
 

src/utility/hal_map.h

@@ -2,7 +2,7 @@
 #ifndef DSY_HAL_MAP_H
 #define DSY_HAL_MAP_H
 
-#include "stm32h7xx_hal.h"
+#include <stm32h7xx_hal.h>
 #include "daisy_core.h"
 
 

src/utility/sai.h

@@ -4,7 +4,8 @@
 
 #include "daisy_core.h"
 
-#include "stm32h7xx_hal_sai.h"
+#include <stm32h7xx_hal.h>
+#include <stm32h7xx_hal_sai.h>
 
 namespace daisy
 {

src/utility/sdram.c

@@ -1,4 +1,4 @@
-#include "stm32h7xx_hal.h"
+#include <stm32h7xx_hal.h>
 #include "sdram.h"
 #include "hal_map.h"
 //#include "libdaisy.h"