system.h

此为ＡＤＳＰ＿ＢＦ５３３＿ＥＺ＿ＫＩＴ中ＡＤ９２４作DA用时的驱动程序

#ifndef  __SYSTEM_DEFINED
#define __SYSTEM_DEFINED

#include <cdefBF533.h>
#include <sys\exception.h>


/********************************************************************************/
/***** Symbolic constants													*****/
/********************************************************************************/


// SYSTEM CONSTANTS  
#define Number_of_DAC_bits		   	14
#define Number_of_DAC_channels   	1
#define Number_of_Samples   		1024		// Block size of words/channel to be DMA'd to DAC
#define Word_Size  					2			// data transfer size in Bytes
												// memory requirement for buffer is
												// Number_of_Samples * Number_of_DAC_channels * Word_Size * 2 BYTES
												// (because of double buffer ping-pong scheme) 

//TEST signals for buffer

//#define LINEAR			// if linear data is desired
#define SINES				// if sinewave should be generated

#define AMPLITUDE	(1<<14)	// amplitude   (max 2^15-1)
#define FREQ_RATIO	1		// number of periods per block


												
												
// EZKIT and external FLASH constants
#define EZ_KIT


#define FLASHA_SRAM 			0x20240000		// base addr for memory space
#define FLASHA_CSIO 			0x20270000		// base addr for programmable IO ports
#define PORTA_DATA_OUT 			0x04			// offset
#define PORTB_DATA_OUT 			0x05			// offset
#define PORTA_DATA_DIR 			0x06			// offset
#define PORTB_DATA_DIR 			0x07			// offset
#define PPI_EXTENDER_CLK_BIT	5				// offset



/********************************************************************************/
/***** Prototypes															*****/
/********************************************************************************/
void InitInterrupts(void);
void InitPPI(void);
void InitPPI_Timer(void);
void StartPPI(void);
void InitSDRAM(void);
void InitFlash(void);
EX_INTERRUPT_HANDLER(PPI_TX_Isr);

/********************************************************************************/
/***** Global variables														*****/
/***** All global variables are declared in main.c							*****/
/********************************************************************************/
extern volatile short sPPI_TxBuffer[];
extern short Ping_Pong;
extern short DMA_completed_Transmission;
extern int interruptLatch;

struct sDMA_descriptor {struct sDMA_descriptor* next_descriptor;
					    volatile short *start_address;
};
typedef struct sDMA_descriptor tDMA_descriptor;

extern tDMA_descriptor DMA_TX_first; // declaration



#endif