memdma_main.asm

ADI公司BF533读取SDRAM数据

#include "defBF533.h"


#define N 0x100// number of elements to transfer 

.extern memdma_init;
.extern activate_dma_engine;
.extern memdma_move1D;

.section L1_data_a;
.align 4;

.global input_buffer;
input_buffer:
.byte _input_buffer[N] = "input_data.dat"; // load in 256 values from a test file
input_buffer.end:

.section sdram_mem;
.align 4;
.global output_buffer;  // output buffer 
output_buffer:
.byte _output_buffer[N];
output_buffer.end:

.section L1_code;
.align 4;
.global _main;

_main:
	call memdma_init;
	
/*****************************************************************************************
	r0 -> src address
	r1 -> XCNT/XMOD
	r3 -> Dst Addr
******************************************************************************************/

	r0.h = input_buffer;		//source address
	r0.l = input_buffer;
	r1.l = N >> 2;			//XCNT 
	r1.h = 4;				//XMOD = 4bytes
							// XMOD has to be at least 4 since 32-bit transfers are used
							
	r3.h = output_buffer;	//Destination Address for first descriptor
	r3.l = output_buffer;
	
	call memdma_move1D;		//setup 1D to 1D L1->L1 descriptor
	
	call activate_dma_engine;
	

stop_here:
	
jump stop_here;
_main.end: