main.c

此dma 也是SBC开发板的

//LED GPIO
#define GPBCON	(*(volatile unsigned long *)0x56000010)
#define GPBDAT	(*(volatile unsigned long *)0x56000014)
#define GPBUP	(*(volatile unsigned long *)0x56000018)

// Set Uart
#define UART_CTL_BASE	0x50000000
#define	reg(i)	(*(volatile unsigned long *)(UART_CTL_BASE + i))
#define	Utrstat0	reg(0x10)
#define Utxh0	reg(0x20)
#define start_send_addr1 (*(char *)0x0)
#define start_send_addr2 (*(char *)0x31000000)

//DMA register
#define DISRC0	(*(volatile unsigned long *)0x4b000000)// source address register
#define DISRCC0	(*(volatile unsigned long *)0x4b000004)// source control register
#define DIDST0	(*(volatile unsigned long *)0x4b000008)// destination address reg
#define DIDSTC0	(*(volatile unsigned long *)0x4b00000c)// destination control reg
#define DCON0	(*(volatile unsigned long *)0x4b000010)// control register
#define DSTAT0	(*(volatile unsigned long *)0x4b000014)// staut register
#define DCSRC0	(*(volatile unsigned long *)0x4b000018)// current source addr reg
#define DCDST0	(*(volatile unsigned long *)0x4b00001c)// current destin addr reg
#define DMASKTRIG0 (*(volatile unsigned long *)0x4b000020)// trriger mask register

//data argument
#define DMA_SRC	0x30000100	//source address
#define DMA_DST	0x31000000	//destination address
#define DMA_SIZE 1024		//bytes 


void InitLed()
{
	GPBCON = (GPBCON & ~0x3fc000) | 0x154000;
	GPBUP &= ~0x780;
}

void LedPlay(int iLedVal)
{
	GPBDAT=(GPBDAT | 0x780) &( ~(( iLedVal & 0x78) << 4));
}

void Delay(int msec)
{
	int iDelay = msec * 2048;
	while(iDelay)
		iDelay--;
}



void send(char* start_address, int len)
{
	
	int i = 0;
	
	for(i = 0; i < len; i++ )
	{
		while(!(Utrstat0 & 0x4));
		Utxh0 = *(start_address + i);
	}
}


void StartDma()
{
	DISRC0 = DMA_SRC;
	DISRCC0 = (0<<1)|(0<<0);
	DIDST0 = DMA_DST;
	DIDSTC0 = (0<<1)|(0<<0);
	DCON0 = (1<<31)|(1<<30)|(1<<28)|(1<<27)|(1<<22)|(2<<20)|(DMA_SIZE/16);
	DMASKTRIG0 = (1<<1)|1;		//open chanel sent out applice software
}

int IsDmaEnd()
{
	return ((DSTAT0 & 0xfffff) == 0);
}



int Main()
{
	int i, j = 0;
	volatile int *piSrc = (int *)DMA_SRC;
	volatile int *piDst = (int *)DMA_DST;
	InitLed();
	StartDma();
	while(!IsDmaEnd());
	for(i = 0;i < DMA_SIZE/4;i++)
		if(*piSrc++ != *piDst++)
			break;
	LedPlay(0x18);
	Delay(100);
	if(i<DMA_SIZE/4)	
		LedPlay(0x38);	//three led bright failed
	else
	{	
		LedPlay(0x48);			//two led bright success
		send(start_send_addr1, 27);		// uart send 
		send(start_send_addr2, 27);		// uart send 
	}
//	send(start_send_address, 400);		// uart send 
 	
//  light led 
	while(1)
	{
		LedPlay(j);
		j++;
		Delay(10);
	}
	return 0;
}