main.asm

BF533 上面Multiple DXE启动代码

/******************************************************************************
**																			 **
**	 Name: 	BF533 EZ-KIT Blink LEDs 										 **
**																			 ** 
*******************************************************************************

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

File Name:		BF533_EZ-KIT_BlinkLeds.asm

Date Modified:	3/27/03		Szy		
				
Software:       VisualDSP++3.1

Hardware:		ADSP-BF533 EZ-KIT Board Rev. 1.1
				ADSP-BF533 Rev. 0.1 Silicon

Special Connections:  SW9 on EZ-KIT Board, pins 1-4 should be ON.

Purpose:		Toggle LEDs on the EZ-KIT
				
				
********************************************************************************/

#include <defBF533.h>
#include "startup.h"

.section L1_code;
.global _main;
.extern Flash_Setup;


#define PF_DIR 0x0000     // PF8-11 inputs
#define PF_POL 0x0000     // all PF active high
#define PF_INEN 0x0f00    // PF8-11 inputs to enable
#define SW7 0x0100        // switch SW7, LED pattern 0 (PF8)
#define SW6 0x0200        // switch SW6, LED pattern 1 (PF9)
#define SW4 0x0400        // switch SW4, LED pattern 2 (PF10)
#define SW5 0x0800        // switch SW5, stop (PF11)

#define led_pattern0 0x15  // initial LED pattern (also SW7)
#define led_pattern1 0x3f  // LED pattern after pressing SW6
#define led_pattern2 0x33  // LED pattern after pressing SW4

#define delay 0x3800000

_main:

	//initialize the flash as the flash pins are linked to the LEDs 
	//instead of the DSPs PF pins.
	CALL Flash_Setup;


// configure programmable flags
    // set PF dir reg
    p0.l = lo(FIO_DIR);
    p0.h = hi(FIO_DIR);
    r0.l = PF_DIR;
    w[p0] = r0;
    ssync;
    
    // set PF polarity reg
    p0.l = lo(FIO_POLAR);
    p0.h = hi(FIO_POLAR);
    r0 = PF_POL;
    w[p0] = r0;
    ssync;
    
    // enable PF inputs    
    p0.l = lo(FIO_INEN);
    p0.h = hi(FIO_INEN);
    r0 = w[p0](z);
    r1.l = PF_INEN;
    r0 = r0 | r1;
    w[p0] = r0;
    ssync;
// flash A csio reg (portB data reg)
	p1.h = hi(flashA_csio);
	p1.l = lo(flashA_csio) + portB_data_out;
	r4 = b[p1](z);     // read portB
	r3 = 0xc0;         // mask of bits 5-0
    r4 = r4 & r3;      // preserve bits 7-6 in r4
	r3 = 0x3f;         // mask of bits 7-6
	r2 = led_pattern0; // set initial LED pattern
	
loop1:
	r2 = r2 & r3;      // mask of bits 7-6
	r2 = r4 | r2;      // set portB content in r2
	b[p1] = r2;        // write flash A portB
	ssync;
	r2 = ~r2;          // togglem LED
	r5 = 0x0;          // clear the stop flag
	call DELAY;
	
jump loop1;
/*	
// check push button sw7 (led_pattern0)
read_pf:
	p0.l = lo(FIO_FLAG_D);
	p0.h = hi (FIO_FLAG_D);
	r0 = w[p0](z);           // read PF data reg
	
sw7_check:
	r1 = SW7;
	r1 = r0 & r1;
	cc = r1 == 0x0;
	if cc jump sw6_check;    // sw7 not asserted
    r2 = led_pattern0;       // sw7 asserted (change LED pattern)
    r5 = 0x0;                // clear the stop flag
    
// check push button sw6 (led_pattern1)
sw6_check:
    r1 = SW6;
	r1 = r0 & r1;
	cc = r1 == 0x0;
	if cc jump sw4_check;    // sw6 not asserted
    r2 = led_pattern1;       // sw6 asserted (change LED pattern)
    r5 = 0x0;                // clear the stop flag

// check push button sw4 (led_pattern2) 
sw4_check:
    r1 = SW4;
	r1 = r0 & r1;
	cc = r1 == 0x0;
	if cc jump sw5_check;    // sw4 not asserted
    r2 = led_pattern2;       // sw4 asserted (change LED pattern)
    r5 = 0x0;                // cleat the stop flag 

// check push button sw5 (stop)	
sw5_check:
	r1 = SW5;
	r1 = r0 & r1;
	cc = r1 == 0x0;
	if !cc jump stop_flag;   // sw5 asserted
	// if here then no switch has been pressed;
	cc = r5 == 0x0;          // check stop flag status
	if cc jump loop1;        // stop flag = OFF 
	jump read_pf;            // stop flag = ON
stop_flag:
    r5 = 0x1;                // set the stop  flag
	jump read_pf;            // check switches from start

*/

DELAY:
	p2.l = lo(delay);
	p2.h = hi(delay);
	lsetup(delay_loop, delay_loop) lc0=p2;
	delay_loop: nop;
	rts;
	
	
	
_main.END: