__flash.c

C语言版的USB单片机固件源代码

//===================================================================//
//     Project Name : ZBoard
//      Module Name : Master Firmware Program
//     Product Type : License
//      OS/Dev Tool : At89C52, uVision 2
//  Original Author : Ray Yang
//     Organization : YBWork.com
//    Original Date : July, 25, 2001
//             Addr : Room 402, No. 131, Meilong No. 9
//              TEL : [phone]
//            EMail : [e-mail]
//          Website : http://www.ybwork.com
//		  Copyright : Copyright (L) YBWork.com, 2001
//         Comments : 
//                    
//					<< History >> 
//					July, 25, 2001		The first release
//===================================================================//

#include "FLASH.H"
#include "HAL.H"
#include "USBD12.H"
#include "VDOR.H"

extern unsigned char idata GenBuf[GENBUF_LENGH];
extern CODE_DATA idata CodeData;

void FlashDisableSDP(void)
{
	// 1st command
	outportb(0x5555, 0xaa);
	// 2nd command
	outportb(0x2aaa, 0x55);
	// 3th command
	outportb(0x5555, 0x80);
	// 4th command
	outportb(0x5555, 0xaa);
	// 5th command
	outportb(0x2aaa, 0x55);
	// 6th command
	outportb(0x5555, 0x20);
}

void FlashGetSPMI(unsigned char nMID, unsigned char nDID)
{
	ENABLE_FLASH;

	// 1st command
	outportb(0x5555, 0xaa);
	// 2nd command
	outportb(0x2aaa, 0x55);
	// 3th command
	outportb(0x5555, 0x90);
	// Pause 10 ms
	DelayMs(10);
	// Get manufaturer code
	nMID = inportb(0);
	// Get device ID code
	nDID = inportb(1);
	// 4th command
	outportb(0x5555, 0xaa);
	// 5th command
	outportb(0x2aaa, 0x55);
	// 6th command
	outportb(0x5555, 0xf0);
	// Pause 10 ms
	DelayMs(10);

	DISABLE_FLASH;
}

void FlashCHipErase(void)
{
	DISABLE_FLASH;
	// Pause
	Delay(10);
	// 1st 0xaa -> 0x5555
	ENABLE_FLASH;
	outportb(0x5555, 0xaa);
	DISABLE_FLASH;
	// 2nd 0x55 -> 0x2aaa
	ENABLE_FLASH;
	outportb(0x2aaa, 0x55);
	DISABLE_FLASH;
	// 3rd 0x80 -> 0x5555
	ENABLE_FLASH;
	outportb(0x5555, 0x80);
	DISABLE_FLASH;
	// 4th 0xaa -> 0x5555
	ENABLE_FLASH;
	outportb(0x5555, 0xaa);
	DISABLE_FLASH;
	// 5th 0x55 -> 0x2aaa
	ENABLE_FLASH;
	outportb(0x2aaa, 0x55);
	DISABLE_FLASH;
	// 6th 0x10 -> 0x5555
	ENABLE_FLASH;
	outportb(0x5555, 0x10);
	DISABLE_FLASH;
	// Pause 20 ms
	DelayMs(20);
}

unsigned char FlashWrite(unsigned char idata* pSrc, unsigned char xdata* pDst, unsigned char nLen)
{
	unsigned char i, j;

	// performs 3 steps of SDP sequence
	// 1st 0xaa -> 0x5555
	ENABLE_FLASH;
	outportb(0x5555, 0xaa);
	DISABLE_FLASH;
	// 2nd 0x55 -> 0x2aaa
	ENABLE_FLASH;
	outportb(0x2aaa, 0x55);
	DISABLE_FLASH;
	// 3rd 0xa0 -> 0x05555
	ENABLE_FLASH;
	outportb(0x5555, 0xa0);
	DISABLE_FLASH;

	// First, Write every bytes in GenBuf to the flash
	for(i=0; i<nLen; i++)
	{
		ENABLE_FLASH;
		outportb(pDst + i, *(pSrc + i));
		DISABLE_FLASH;
	}

	// Pause 20 ms for programming cycle
	DelayMs(200);
	
	return j;
}

void FlashRead(unsigned char xdata* pSrc, unsigned char idata* pDst, unsigned char nLen)
{
	unsigned char i;

	ENABLE_FLASH;
	for(i=0; i<nLen; i++)
		*(pDst + i) = inportb(pSrc + i);

	DISABLE_FLASH;
	
}