blink_code.asm

BLACKFIN BF533 的启动初试化程序

/******************************************************************************

(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved.

File Name:		Boot_Blink_Code.ASM

Date Modified:	7/11/03		Rev 1.0
				
Purpose:	   	This blink example is being used to explain how to create a
				loader file.  The loader file will be programmed into the flash
				on the ADSP-BF533 Ez-Kit Lite.  Upon RESET, code will be booted
				into the start of L1 memory.
				
				This example includes the use of initialization code which, in 
				the case, will be Sdram initialization.  Upon RESET, the On-Chip
				Boot Rom will load in the Init Code into internal L1 memory.  It
				will make a CALL to this code and after execution, the processor
				will jump back to the On-Chip Boot Rom for application code 
				booting.  The application code is a blink program which resides
				in Sdram Memory. 	
				
*******************************************************************************/

#include <defBF533.h>

/******************************************************************************
FLASH A Port B Controls:  0 = LED OFF; 1 = LED ON
Bit0:	LED4
Bit1:	LED5
Bit2:	LED6
Bit3:	LED7
Bit4:	LED8
Bit5:	LED9
*******************************************************************************/

#define Flash_A_Registers 	0x20270000	//Base Address for Flash A Registers
#define PortB_Data_Out 		0x00000005	//offset
#define PortB_Data_Dir 		0x00000007	//offset

#define Delay 				0x1FFFFFF	//Loop Delay

.section program;
P0.H = START;
P0.H = START;
JUMP(P0);

.section sdram;
START:

P0.H = HI(EBIU_AMGCTL);
P0.L = LO(EBIU_AMGCTL);
R0.L = W[P0];

//Enable all AMS Banks
R1 = 0xE;
R0 = R0 | R1;
W[P0] = R0.L;	

//Set all Flags as Outputs
P1.H = HI(Flash_A_Registers);
P1.L = LO(Flash_A_Registers) + PortB_Data_Dir;
R0 = 0xFF;
B[P1] = R0;

//Turn On LEDs
P1.H = HI(Flash_A_Registers);
P1.L = LO(Flash_A_Registers) + PortB_Data_Out;

R0 = 0x7;

//Initialize Loop Counter
P2.H = HI(Delay);
P2.L = LO(Delay);

Blink_Loop:
	//Write Port B
	B[P1] = R0;
	
	LSETUP(Delay_Start, Delay_End) LC0 = P2;
		Delay_Start:
		Delay_End: NOP;
		
	//Toggle LEDs
	R0 = ~R0;
JUMP Blink_Loop;

//End Label
START.END:	NOP;