又是4天，昨晚师兄说进度太慢，今天一天开挂，终于把FLASH搞定了http://www/uc/myshow/blog/misc/gif/E___6702EN00SIGG.gif。spi代码很短，一晚就写完，但是debug就用了两天多。
  觉得最大的问题是在FLASH上，本以为flash和eeprom一样。其实flash有很大不同，首先是通信的协议不同，eeprom是i2c，而flash是spi；其次eeprom传设备地址就可以直接读写，需要应答，单双工。flash 不需要设备地址，但需要先传一个8位命令，然后再进行一系列操作。再flash还有很多保护机制，写之前要enable write；
flash 的储存模式以不同，flash 写的时候只能写0，1就不用写，所以一开始要先擦除（erase），使所有位都变成1.擦除是又有4种模式，4k,32k,64k和全部擦除（chip erase）。

（测试： mcu:msp430f149 , flash:W25Q64BV ；对应引脚已在文件说明）
以下是代码：




















 //SPI MODE = 3

#ifndef SPI_H_
#define SPI_H_


#include <msp430x14x.h>
        
#define SI_1 (P6OUT |= BIT7)
#define SI_0 (P6OUT &= ~BIT7)        //P6.7

#define SO_1 (P6OUT |= BIT5)
#define SO_0 (P6OUT &= ~BIT5)        //P6.5      

#define SCK_1 (P2OUT |= BIT2)
#define SCK_0 (P2OUT &= ~BIT2)        //P6.5 


#define SS_1 (P6OUT |= BIT6)
#define SS_0 (P6OUT &= ~BIT6)        //P6.6

void Delay(void);
void Init_SPI(void);
void Writebyte(unsigned char wdata);
unsigned char Readbyte(void);

#endif


















#include <msp430x14x.h>
#include "SPI.h"

void Init_SPI(void)
{
    P6DIR |= (BIT6 + BIT7);         //P6.6 ncs2,P6.7 SI
    P6DIR &= ~BIT5;                 //SO
    P6OUT  |= BIT7;                    //SI
    P2DIR |= BIT2 + BIT3 + BIT4;    //SCK,NSC1,NSC3
    P2OUT |= BIT3 + BIT4;   
    SS_1;                            //nsc2
    SCK_1;                            //
   
   
}




void Delay(void)
{
    unsigned char i;
    for( i=0; i<20; i++)
    {
        _NOP();
    }
}




void Writebyte(unsigned char wdata)
{
    unsigned char i;

    for (i=0; i<8; i++)
    {
        SCK_0;
        if (wdata & BIT7)
        {
            SI_1;
        }
        else
        {
            SI_0;
        }
       
        wdata<<=1;
        SCK_1;

    }
}





unsigned char Readbyte (void)
{
    unsigned char i,rdata;

    for (i=0; i<8; i++)
    {
        SCK_1;
        rdata<<=1;
        if (P6IN&BIT5)
        {
            rdata |= 0x01;
        }
       
        SCK_0;
    }
  return rdata;
}















#ifndef W25Q64B_H_
#define W25Q64B_H_


void ReadNbyte(unsigned char Haddr,unsigned char Maddr,unsigned char Laddr,unsigned char *rbuff, unsigned int n);
void Erase(unsigned char era,unsigned char Haddr,unsigned char Maddr,unsigned char Laddr);
void WriteNbyte(unsigned char Haddr,unsigned char Maddr,unsigned char Laddr,unsigned char *wbuff,unsigned int n);

#endif



















#include "SPI.h"
#include "w25q64b.h"




void WriteNbyte (unsigned char Haddr,unsigned char Maddr,unsigned char Laddr,unsigned char *wbuff,unsigned int n)
{
    unsigned int i;
   
    SS_0;  
    Writebyte(0x06);
    SS_1;

    SS_0;
    SCK_1;
   
    Writebyte(0x02);
    Writebyte(Haddr);
    Writebyte(Maddr);
    Writebyte(Laddr);

    for (i=0; i<n; i++)
    {
        Writebyte(wbuff[i]);
    }

    SS_1;
}




void ReadNbyte (unsigned char Haddr,unsigned char Maddr,unsigned char Laddr,unsigned char *rbuff,unsigned int n)
{
    unsigned int i;

    SS_0;
    SCK_1;
    Writebyte(0x03);
    Writebyte(Haddr);
    Writebyte(Maddr);
    Writebyte(Laddr);

    SCK_0;

    for (i=0; i<n; i++)
    {
        rbuff[i] = Readbyte();
    }

    SS_1;
}




void Erase(unsigned char era,unsigned char Haddr,unsigned char Maddr,unsigned char Laddr)
{
    SS_0;
    SCK_1;
    Writebyte(0x06);
    SS_1;
   
    SS_0;
    SCK_1;
   
    Writebyte(era);
    Writebyte(Haddr);
    Writebyte(Maddr);
    Writebyte(Laddr);
       
    SS_1;
}
















#include <msp430x14x.h>
#include "SPI.h"
#include "w25q64b.h"

unsigned char Rbuff[10];    //receive data

void Init_clk(void)            //initialization clock
{
    unsigned char j;
    BCSCTL1 &= ~XT2OFF;

    do
    {
        IFG1 &= ~ OFIFG;
        for ( j = 0xff ; j>0 ; j--){
            _NOP();
        }
    }
    while ((IFG1&OFIFG)!=0);

    BCSCTL2 |= SELM_2 + SELS;

}
void main()
{
    unsigned char i,write_data[10];
   
    WDTCTL = WDTPW + WDTHOLD;            //close watchdot
   
    for (i=0; i<9; i++)                    //assignment
    {
        write_data[i] = 97 + i;
    }
   
    Init_clk();
    Init_SPI();
   
    while (1)
    {
    Erase(0x20,0x00,0x00,0x00);   // Sector Erase (20h) 
    Delay();
   
    ReadNbyte(0x00,0x00,0x00,Rbuff,9);  //read data(9 char)
   
    WriteNbyte(0x00,0x00,0x00,write_data,9);  //write data(9 char)
   
    ReadNbyte(0x00,0x00,0x00,Rbuff,9);        //read data(9 char)
   
    }

}