bf533_ez-kit_flash_setup.asm

ADI BLACKFIN BF533 的IIC驱动程序

/******************************************************************************/
//
// Name: 	BF533 EZ-KIT video ITU-656 receive mode (8bit) for the Omnivision chip OV6630
//
/*****************************************************************************************

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

File Name:				BF533_EZ-KIT_flash_setup.asm

Date Modified:			01/08/07		TL		Rev 2.0

Software:       		VisualDSP++4.5, Assembler 1.1.0.2, Linker 3.8.0.2

Hardware:				BF533 EZ-KIT Board (rev 1.2), Blackfin EZ-Extender (rev 1.2)

Chip:					ADSP-BF533 REV 0.2

Special Connections:  None

Purpose:		To configure the flash for video devices 
				
				
Program Parameters:

*********************************************************************************/
#include <defBF533.h>

/*****************************************************************************************/
// Global and extern subroutines
/*****************************************************************************************/

.global BF533_EZ_KIT_flash_setup;


/*****************************************************************************************/
// Program Define Section
/*****************************************************************************************/

//Setup of flash A on the EZ-KIT
// set asynch mem timing registers

//all banks enabled
#define en_async_mem 0xf

//all banks are configured in: 
//4 cycles transition time; 3 cycles setup time; 2 cycles hold time; 
//11 cycles read access time; 7 cycles write access time
#define amb0_timing 0x7bb0
#define amb1_timing 0x7bb0
#define amb2_timing 0x7bb0
#define amb3_timing 0x7bb0

#define flashA_sram 0x20240000	// base addr
#define flashA_csio 0x20270000	// base addr
#define portA_data_out 0x04	// offset
#define portB_data_out 0x05	// offset
#define portA_data_dir 0x06	// offset
#define portB_data_dir 0x07	// offset

/*****************************************************************************************/
// Program Variable Section
/*****************************************************************************************/

/*****************************************************************************************/
// Program
/*****************************************************************************************/
.section L1_code;
BF533_EZ_KIT_flash_setup:

	//Async Memory Bank Control Register
    p0.h = hi(EBIU_AMBCTL0);
	p0.l = lo(EBIU_AMBCTL0);
	r0.l = amb0_timing;
	r0.h = amb1_timing;
	[p0] = r0;

	p0.h = hi(EBIU_AMBCTL1);
	p0.l = lo(EBIU_AMBCTL1);
	r0.l = amb2_timing;
	r0.h = amb3_timing;
	[p0] = r0;

	//Async Memory Global Control Register
	p0.h = hi(EBIU_AMGCTL);
	p0.l = lo(EBIU_AMGCTL);
	r0.l = w[p0];
	r1 = en_async_mem;
	r0 = r0 | r1;
	w[p0] = r0;		
	ssync;

	
	//Initialize flash A csio regs (port A)

    // clear data registers
	p1.h = hi(flashA_csio);
	p1.l = lo(flashA_csio) + portA_data_out;
	r0 = 0x0;
	w[p1] = r0;
	
    // direction control registers
	p1.h = hi(flashA_csio);
	p1.l = lo(flashA_csio) + portA_data_dir;
	r0 = 0xFFFF(Z);      // set dir=output
	w[p1] = r0;

BF533_EZ_KIT_flash_setup.END:
RTS;
/**************************************************************************/