#define SDMA_SEL (*((volatile unsigned long *)0x7E00F110))
#define DMACIntTCClear (*((volatile unsigned long *)0x7DB00008))
#define DMACIntErrClr (*((volatile unsigned long *)0x7DB00010))
#define DMACConfiguration (*((volatile unsigned long *)0x7DB00030))
#define DMACSync (*((volatile unsigned long *)0x7DB00034))
#define DMACC0SrcAddr (*((volatile unsigned long *)0x7DB00100))
#define DMACC0DestAddr (*((volatile unsigned long *)0x7DB00104))
#define DMACC0Control0 (*((volatile unsigned long *)0x7DB0010c))
#define DMACC0Control1 (*((volatile unsigned long *)0x7DB00110))
#define DMACC0Configuration (*((volatile unsigned long *)0x7DB00114))
#define UTXH0 (volatile unsigned long *)0x7F005020
char src[100] = "\n\rHello World-> This is a test!\n\r";
void dma_init()
{
//DMA控制器选择(SDMA0)
SDMA_SEL = 0;
//DMA控制器使能
DMACConfiguration = 1;
//初始化源地址
DMACC0SrcAddr = (unsigned int)src;
//初始化目的地址
DMACC0DestAddr = (unsigned int)UTXH0;
//对寄存器进行配置
/*
源地址自增
目的地址固定
目标主机选择AHB主机2
源主机选择AHB主机1
*/
DMACC0Control0 = (1 << 25) | (1 << 26) | (1 << 31);
DMACC0Control1 = 0x64;
/*
流控制和传输类型:MTP 为 001
目标外设:DMA_UART0_1,源外设:DMA_MEM
通道有效: 1
*/
DMACC0Configuration = (1<<6) | (1<<11) | (1<<14) | (1<<15);
}
void dma_start()
{
//开启channel0 DMA
DMACC0Configuration = 1;
}