added dcd_dma_descriptor_t typdef

reorganize test project, multiple test projects each is specifically for an MCU

tinyusb/device/dcd_lpc175x_6x.c

@@ -51,6 +51,7 @@
 //--------------------------------------------------------------------+
 // MACRO CONSTANT TYPEDEF
 //--------------------------------------------------------------------+
+STATIC_ dcd_dma_descriptor_t* dcd_udca[32] ATTR_ALIGNED(128) TUSB_CFG_ATTR_USBRAM;
 
 //--------------------------------------------------------------------+
 // INTERNAL OBJECT & FUNCTION DECLARATION

tinyusb/device/dcd_lpc175x_6x.h

@@ -46,11 +46,49 @@
 #ifndef _TUSB_DCD_LPC175X_6X_H_
 #define _TUSB_DCD_LPC175X_6X_H_
 
+#include "common/common.h"
+
 #ifdef __cplusplus
  extern "C" {
 #endif
 
 
+typedef struct
+{
+	//------------- Word 0 -------------//
+	uint32_t next;
+
+	//------------- Word 1 -------------//
+	uint16_t mode            : 2; // either normal or ATLE(auto length extraction)
+	uint16_t is_next_valid   : 1;
+	uint16_t                 : 1;
+	uint16_t is_isochronous  : 1; // is an iso endpoint
+	uint16_t max_packet_size : 11;
+	volatile uint16_t buffer_length;
+
+	//------------- Word 2 -------------//
+	volatile uint8_t* buffer_start_addr;
+
+	//------------- Word 3 -------------//
+	volatile uint16_t is_retired                   : 1; // initialized to zero
+	volatile uint16_t status                       : 4;
+	volatile uint16_t iso_last_packet_valid        : 1;
+	volatile uint16_t atle_is_lsb_extracted        : 1;	// used in ATLE mode
+	volatile uint16_t atle_is_msb_extracted        : 1;	// used in ATLE mode
+	volatile uint16_t atle_message_length_position : 6; // used in ATLE mode
+	uint16_t                                       : 2;
+	volatile uint16_t present_count; // The number of bytes transferred by the DMA engine. The DMA engine updates this field after completing each packet transfer.
+
+	//------------- Word 4 -------------//
+//	uint32_t iso_packet_size_addr;		// iso only, can be omitted for non-iso
+} ATTR_ALIGNED(4) dcd_dma_descriptor_t;
+
+#define DCD_DD_NUM 10 // TODO scale with configure
+typedef struct {
+  dcd_dma_descriptor_t dd[DCD_DD_NUM];
+
+}dcd_data_t;
+
 #ifdef __cplusplus
  }
 #endif