Arduino ATmega328+；高速闪速存储器

前言：这个问题是关于我与大学教授合作的一个项目。这不是为了分数，但我在这位教授身上的声誉确实很重要。所以，虽然我在这个项目上的成功对我来说很重要，但我并不认为从堆栈溢出中寻求帮助是不公平的

这就是说，这里是我的项目的高层次概述。我有一个ATmega328微控制器。我有一个微芯片SST64Mbit闪存卡。ATmega具有SPI的硬件实现。闪存具有SPI的硬件实现

我的目标是在SPI主模式下使用ATmega从闪存芯片读取数据并将数据写入闪存芯片。内存被组织在一个多覆盖结构中，这对于擦除来说很好，但是对于我来说，它基本上只有32768页，每个页256字节

写数据的基本思想是发送一个指令字节，然后是起始地址，然后是数据。读取数据的基本思想是，我先发送一个指令字节，然后是起始地址，然后是一个伪字节，然后它开始向我发送数据

以下是数据表：

#include <SPI.h>
#include <Peggy2.h>

#define SS_PIN  16

Peggy2 frame1;
byte toDisp = 0;
byte checker = 0;

void setup()
{
    frame1.HardwareInit();
    pinMode(SS_PIN,OUTPUT); //set pin16 to output, SS pin
    SPI.setClockDivider(SPI_CLOCK_DIV2); //set the SPI clock to f/2, fastest possible
    SPI.begin();    //SPI lib function which sets ddr for SCK and MOSI pin
                    //MISO is auto input
                    //see SPI.cpp for more info

}

void loop()
{

    if(!checker){
                enableProgramming();
        programData();
        toDisp = receiveByte(0);
        checker = 1;
        frame1.WriteRow(0,toDisp);
    }
    frame1.RefreshAll(2);

}

byte receiveByte(unsigned long startAddress)
{
    //Begin High Speed Read Instruction
    //See p. 10 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x0B); //high speed read instruction
    SPI.transfer(0x00); //next 3 transfers are address bits A32 - A0
    SPI.transfer(0x00); //So this will read the first byte on the chip
    SPI.transfer(0x00); //last address bits
    SPI.transfer(0xFF); //dummy byte is required to start sending data back to uP
    SPI.transfer(0xFF); //I'm hoping that if I transfer a bullshit byte, the flash
                        //chip will transfer it's data to me in the same time
    digitalWrite(SS_PIN,HIGH);
    //End High Speed Read Instruction   
    return SPDR;    
}

//will perform the read instruction starting from
//startAddress and will receive numOfBytes bytes in
//succession
void receiveBytes(int numOfBytes, unsigned long startAddress)
{
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x0B);//high speed read instruction

}

//will perform:
// 1) Chip Erase
// and loop through:
// 1) Page Program
// 2) increment Page
//until the data has finished **note this can loop and over write beginning of memory
void programData(){
    //Begin ChipErase Instruction
    //See p. 17 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x60);//chip erase instruction
    digitalWrite(SS_PIN,HIGH);
    delay(50);//spec'd time for CE to finish
                //don't bother polling because time to program is irrelevant
    //End ChipErase Instruction

        //Begin WREN Instruction
    //See p. 18 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x06);//write enable instruction
    digitalWrite(SS_PIN,HIGH);
    //End WREN Instruction

    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x02); //page program instruction
    SPI.transfer(0x00); //first 8 address bits
    SPI.transfer(0x00); //2nd 8 address bits
    SPI.transfer(0x00); //3rd 8 address bits
    SPI.transfer(0xAA); //10101010 is the byte I should be writing
    digitalWrite(SS_PIN,HIGH);
    delayMicroseconds(3000); //wait 3 ms for page program


    /*
    //Begin Page-Program Instruction
    //see p. 13 of SST data sheet
    byte firstAddress = 0;
    byte secondAddress = 0;
    //this loop will write to every byte in the chips memory
    //32,768 pages of 256 bytes = 8,388,608 bytes
    for(unsigned int i = 0; i < 32,768; ++i) //long variable is number of pages
    {
        digitalWrite(SS_PIN,LOW);
        ++secondAddress; //cycles from 0 to 255, counts pages
        firstAddress = i>>8; // floor(i/256)

        SPI.transfer(0x02);//Page-Program instruction byte
        SPI.transfer(firstAddress); //increments every 256 pages i.e. at page 256 this should be 1
        SPI.transfer(secondAddress); //increments every 256 bytes, i.e every page
        SPI.transfer(0x00); //beginning of a page boundary
        for(int j = 0; j < 256; ++j) //number of bytes per page
        {
            SPI.transfer(2program[(256*i) + j]);//data byte transfer            
        }
        digitalWrite(SS_PIN,HIGH);
        delayMicroseconds(2500); //2500us (2.5ms) delay for each page-program instruction to execute
    }
    //End Page-Program Instruction
    */
}

//Will prepare the chip for writing by performing:
// 1) arm the status register
// 2) Write Enable instruction
//Only needs to be performed once!
void enableProgramming(){
    //Begin EWSR & WRSR Instructions
    //See p. 20 of SST data sheet for more info
    digitalWrite(SS_PIN,LOW); //lower the SS pin
    SPI.transfer(0x50); //enable write status register instruction
    digitalWrite(SS_PIN,HIGH); //raise the SS pin
    delay(10);
    digitalWrite(SS_PIN,LOW); //lower the SS pin
    SPI.transfer(0x01); //write the status register instruction
    SPI.transfer(0x00);//value to write to register
                //xx0000xx will remove all block protection
    digitalWrite(SS_PIN,HIGH);
    //End EWSR & WRSR Instructions

    //Begin WREN Instruction
    //See p. 18 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x06);//write enable instruction
    digitalWrite(SS_PIN,HIGH);
    //End WREN Instruction

}

微控制器：

闪光：

代码：

#include <SPI.h>
#include <Peggy2.h>

#define SS_PIN  16

Peggy2 frame1;
byte toDisp = 0;
byte checker = 0;

void setup()
{
    frame1.HardwareInit();
    pinMode(SS_PIN,OUTPUT); //set pin16 to output, SS pin
    SPI.setClockDivider(SPI_CLOCK_DIV2); //set the SPI clock to f/2, fastest possible
    SPI.begin();    //SPI lib function which sets ddr for SCK and MOSI pin
                    //MISO is auto input
                    //see SPI.cpp for more info

}

void loop()
{

    if(!checker){
                enableProgramming();
        programData();
        toDisp = receiveByte(0);
        checker = 1;
        frame1.WriteRow(0,toDisp);
    }
    frame1.RefreshAll(2);

}

byte receiveByte(unsigned long startAddress)
{
    //Begin High Speed Read Instruction
    //See p. 10 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x0B); //high speed read instruction
    SPI.transfer(0x00); //next 3 transfers are address bits A32 - A0
    SPI.transfer(0x00); //So this will read the first byte on the chip
    SPI.transfer(0x00); //last address bits
    SPI.transfer(0xFF); //dummy byte is required to start sending data back to uP
    SPI.transfer(0xFF); //I'm hoping that if I transfer a bullshit byte, the flash
                        //chip will transfer it's data to me in the same time
    digitalWrite(SS_PIN,HIGH);
    //End High Speed Read Instruction   
    return SPDR;    
}

//will perform the read instruction starting from
//startAddress and will receive numOfBytes bytes in
//succession
void receiveBytes(int numOfBytes, unsigned long startAddress)
{
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x0B);//high speed read instruction

}

//will perform:
// 1) Chip Erase
// and loop through:
// 1) Page Program
// 2) increment Page
//until the data has finished **note this can loop and over write beginning of memory
void programData(){
    //Begin ChipErase Instruction
    //See p. 17 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x60);//chip erase instruction
    digitalWrite(SS_PIN,HIGH);
    delay(50);//spec'd time for CE to finish
                //don't bother polling because time to program is irrelevant
    //End ChipErase Instruction

        //Begin WREN Instruction
    //See p. 18 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x06);//write enable instruction
    digitalWrite(SS_PIN,HIGH);
    //End WREN Instruction

    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x02); //page program instruction
    SPI.transfer(0x00); //first 8 address bits
    SPI.transfer(0x00); //2nd 8 address bits
    SPI.transfer(0x00); //3rd 8 address bits
    SPI.transfer(0xAA); //10101010 is the byte I should be writing
    digitalWrite(SS_PIN,HIGH);
    delayMicroseconds(3000); //wait 3 ms for page program


    /*
    //Begin Page-Program Instruction
    //see p. 13 of SST data sheet
    byte firstAddress = 0;
    byte secondAddress = 0;
    //this loop will write to every byte in the chips memory
    //32,768 pages of 256 bytes = 8,388,608 bytes
    for(unsigned int i = 0; i < 32,768; ++i) //long variable is number of pages
    {
        digitalWrite(SS_PIN,LOW);
        ++secondAddress; //cycles from 0 to 255, counts pages
        firstAddress = i>>8; // floor(i/256)

        SPI.transfer(0x02);//Page-Program instruction byte
        SPI.transfer(firstAddress); //increments every 256 pages i.e. at page 256 this should be 1
        SPI.transfer(secondAddress); //increments every 256 bytes, i.e every page
        SPI.transfer(0x00); //beginning of a page boundary
        for(int j = 0; j < 256; ++j) //number of bytes per page
        {
            SPI.transfer(2program[(256*i) + j]);//data byte transfer            
        }
        digitalWrite(SS_PIN,HIGH);
        delayMicroseconds(2500); //2500us (2.5ms) delay for each page-program instruction to execute
    }
    //End Page-Program Instruction
    */
}

//Will prepare the chip for writing by performing:
// 1) arm the status register
// 2) Write Enable instruction
//Only needs to be performed once!
void enableProgramming(){
    //Begin EWSR & WRSR Instructions
    //See p. 20 of SST data sheet for more info
    digitalWrite(SS_PIN,LOW); //lower the SS pin
    SPI.transfer(0x50); //enable write status register instruction
    digitalWrite(SS_PIN,HIGH); //raise the SS pin
    delay(10);
    digitalWrite(SS_PIN,LOW); //lower the SS pin
    SPI.transfer(0x01); //write the status register instruction
    SPI.transfer(0x00);//value to write to register
                //xx0000xx will remove all block protection
    digitalWrite(SS_PIN,HIGH);
    //End EWSR & WRSR Instructions

    //Begin WREN Instruction
    //See p. 18 of SST data sheet
    digitalWrite(SS_PIN,LOW);
    SPI.transfer(0x06);//write enable instruction
    digitalWrite(SS_PIN,HIGH);
    //End WREN Instruction

}

#包括
#包括
#定义SS_引脚16
Peggy2框架1；
字节toDisp=0；
字节检查器=0；
无效设置（）
{
frame1.HardwareInit（）；
pinMode（SS_引脚，输出）；//将引脚16设置为输出，SS引脚
setClockDivider（SPI_CLOCK_DIV2）；//以尽可能快的速度将SPI时钟设置为f/2
SPI.begin（）；//为SCK和MOSI引脚设置ddr的SPI lib函数
//味噌是自动输入的
//有关更多信息，请参见SPI.cpp
}
void循环（）
{
如果（！checker）{
使能编程（）；
编程数据（）；
toDisp=接收字节（0）；
检查器=1；
frame1.WriteRow（0，toDisp）；
}
框架1.刷新所有（2）；
}
字节接收字节（无符号长起始地址）
{
//开始高速读取指令
//见SST数据表第10页
数字写入（SS_引脚，低电平）；
SPI.transfer（0x0B）；//高速读取指令
SPI.transfer（0x00）；//接下来的3次传输是地址位A32-A0
SPI.transfer（0x00）；//因此这将读取芯片上的第一个字节
SPI.transfer（0x00）；//最后的地址位
SPI.transfer（0xFF）；//开始向上发送数据需要伪字节
SPI.transfer（0xFF）；//我希望如果我传输一个垃圾字节，闪存
//芯片会同时把它的数据传送给我
数字写入（SS_引脚，高电平）；
//结束高速读取指令
返回SPDR；
}
//将从开始执行读取指令
//startAddress并将在中接收numobytes字节
//继承
void receiveBytes（整数numobytes，无符号长起始地址）
{
数字写入（SS_引脚，低电平）；
SPI.transfer（0x0B）；//高速读取指令
}
//将执行：
//1）芯片擦除
//并循环通过：
//1）页面程序
//2）增量页
//直到数据完成**注意，这可以循环并覆盖内存的开始
无效程序数据（）{
//开始芯片擦除指令
//见SST数据表第17页
数字写入（SS_引脚，低电平）；
SPI.transfer（0x60）；//芯片擦除指令
数字写入（SS_引脚，高电平）；
延迟（50）；//指定CE完成的时间
//不要费心投票，因为编程时间无关紧要
//结束芯片擦除指令
//开始鹪鹩指令
//见SST数据表第18页
数字写入（SS_引脚，低电平）；
SPI.transfer（0x06）；//写启用指令
数字写入（SS_引脚，高电平）；
//末端扳手指令
数字写入（SS_引脚，低电平）；
SPI.transfer（0x02）；//页面程序指令
SPI.transfer（0x00）；//前8个地址位
SPI.transfer（0x00）；//第二个8地址位
SPI.transfer（0x00）；//第三个8地址位
SPI.transfer（0xAA）；//10101010是我应该写入的字节
数字写入（SS_引脚，高电平）；
延迟微秒（3000）；//等待页面程序3毫秒
/*
//起始页程序指令
//见SST数据表第13页
字节firstAddress=0；
字节第二地址=0；
//这个循环将写入芯片内存中的每个字节
//32768页共256字节=8388608字节
for（unsigned int i=0；i<32768；++i）//long变量是页数
{
数字写入（SS_引脚，低电平）；
++secondAddress；//从0到255的周期，计算页数
firstAddress=i>>8；//楼层（i/256）
SPI.transfer（0x02）；//页程序指令字节
SPI.transfer（firstAddress）；//每256页递增一次，即在第256页，该值应为1
SPI.transfer（secondAddress）；//每256字节递增一次，即每页递增一次
SPI.transfer（0x00）；//页面边界的开头
对于（int j=0；j<256；++j）//每页的字节数
{
SPI.transfer（2program[（256*i）+j]）；//数据字节传输
}
数字写入（SS_引脚，高电平）；
delayMicroseconds（2500）；//2500us（2.5ms）执行每个页面程序指令的延迟
}
//结束页程序指令
*/
}
//将通过执行以下操作准备芯片进行写入：
//1）启用状态寄存器
//2）写使能指令
//只需要执行一次！
void enableProgramming（）{
//开始EWSR和WRSR说明
//更多信息请参见SST数据表第20页
digitalWrite（SS_引脚，低）；//降低SS引脚
SPI.transfer（0x50）；//启用写入状态寄存器指令
digitalWrite（不锈钢管脚，高）；//抬起不锈钢管脚
延迟（10）；
digitalWrite（SS_引脚，低）；//降低SS引脚
SPI.transfer（0x01）；//写入状态寄存器指令
SPI.transfer（0x00）；//要写入寄存器的值
//xx0000xx将删除所有块保护
数字写入（SS_引脚，高电平）；
//结束EWSR和WRSR说明
//开始鹪鹩指令
//见SST数据表第18页
数字写入（SS_引脚，低电平）；
SPI.transfer（0x06）；//写启用指令