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#include "W25Q128_Ins.h"
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#include "MYSPI.h"
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#include "SysTick.h"
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#include "USART.h"
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u16 W25QXX_TYPE=W25Q128; //型号W25Q128，4K字节为一个扇区，16个扇区为1个块，容量为16M字节,共128个块,4096个扇区//
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//初始化SPI FLASH的IO口//
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void W25QXX_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );//PORTB时钟使能
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; // PB12，对应该闪存的CS引脚//
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出//
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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GPIO_SetBits(GPIOA,GPIO_Pin_4); //PB12置高电平//
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W25QXX_CS=1; //SPI FLASH不选中，其实跟上一行代码实现功能一样//
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SPI1_Init(); //初始化SPI//
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SPI1_SetSpeed(SPI_BaudRatePrescaler_2); //重新设置波特率为18M时钟,高速模式//
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W25QXX_TYPE=W25QXX_ReadID(); //读取FLASH ID//
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}
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//编写读取W25QXX的状态寄存器函数，这里只读取S0-S7位的值//
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u8 W25QXX_ReadSR(void)
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{
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u8 byte=0;
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_ReadStatusReg); //发送读取状态寄存器指令，W25X_ReadStatusReg=0x05，可忽略接收值//
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byte=SPI1_ReadWriteByte(0Xff); //读取一个字节，发送0xff，读取回来的值传至byte//
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W25QXX_CS=1; //取消片选
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return byte;
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}
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//编写写入W25QXX状态寄存器函数，这里只有SPR,TB,BP2,BP1,BP0(bit 7,5,4,3,2)可以写？？？//
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void W25QXX_Write_SR(u8 sr)
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{
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_WriteStatusReg);//发送写入状态寄存器指令，W25X_WriteStatusReg=0x01，忽略接收值//
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SPI1_ReadWriteByte(sr); //写入一个字节，忽略接收值//
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W25QXX_CS=1; //取消片选//
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}
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//W25QXX写入使能，将WEL置1//
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void W25QXX_Write_Enable(void)
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{
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W25QXX_CS=0; //W25QXX_CS对应PBout(12)，即PB12置0//
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SPI1_ReadWriteByte(W25X_WriteEnable); //写入使能，W25X_WriteEnable的指令为0x06//
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W25QXX_CS=1; //取消片选，即PB12置1//
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}
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//W25QXX写入禁止，将WEL清零，即置0//
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void W25QXX_Write_Disable(void)
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{
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_WriteDisable); //发送写入禁止指令，W25X_WriteDisable为0x04//
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W25QXX_CS=1; //取消片选//
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}
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//读取芯片ID，本开发版返回值0XEF17,表示芯片型号为W25Q128//
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u16 W25QXX_ReadID(void)
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{
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u16 Temp = 0;
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W25QXX_CS=0;
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SPI1_ReadWriteByte(0x90); //发送读取ID命令，即0x90//
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SPI1_ReadWriteByte(0x00); //后面跟一个24位0x000000地址//
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SPI1_ReadWriteByte(0x00);
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SPI1_ReadWriteByte(0x00);
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Temp|=SPI1_ReadWriteByte(0xFF)<<8; //读取Manufacturer ID号，即0xEF//
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Temp|=SPI1_ReadWriteByte(0xFF); //读取Device ID号，即0x17//
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W25QXX_CS=1;
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return Temp;
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}
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//pBuffer:数据存储区，ReadAddr:开始读取的地址(24bit)，NumByteToRead:要读取的字节数(最大65535)//
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void W25QXX_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead)
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{
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u16 i;
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_ReadData); //发送读取指令,W25X_ReadData为0x03//
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SPI1_ReadWriteByte((u8)((ReadAddr)>>16)); //发送24bit地址，最低的8位//
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SPI1_ReadWriteByte((u8)((ReadAddr)>>8)); //发送24bit地址，次低的8位//
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SPI1_ReadWriteByte((u8)ReadAddr); //发送24bit地址，高8位//
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for(i=0;i<NumByteToRead;i++)
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{
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pBuffer[i]=SPI1_ReadWriteByte(0XFF); //循环读数，每次读1个字节//
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}
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W25QXX_CS=1;
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}
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//SPI在一页(0~65535个字节)内写入少于256个字节的数据//
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//pBuffer:数据存储区，WriteAddr:开始写入的地址(24bit)，NumByteToWrite:要写入的字节数(最大256),不应超过该页的剩余字节数//
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void W25QXX_Write_Page(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
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{
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u16 i;
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W25QXX_Write_Enable(); //SET WEL//
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_PageProgram); //发送写页命令，W25X_PageProgram为0x02//
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SPI1_ReadWriteByte((u8)((WriteAddr)>>16)); //发送24bit地址，最低的8位//
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SPI1_ReadWriteByte((u8)((WriteAddr)>>8)); //发送24bit地址，次低的8位//
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SPI1_ReadWriteByte((u8)WriteAddr); //发送24bit地址，高8位//
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for(i=0;i<NumByteToWrite;i++)
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SPI1_ReadWriteByte(pBuffer[i]); //循环写数,每次写1个字节//
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W25QXX_CS=1; //取消片选//
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W25QXX_Wait_Busy(); //等待写入结束//
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}
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//无检验写入SPI FLASH，确保所写地址范围内的数据全部为0XFF,否则在非0XFF处写入的数据将失败//
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//具有自动换页功能，在指定地址开始写入指定长度的数据,但是要确保地址不越界//
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//pBuffer:数据存储区，WriteAddr:开始写入的地址(24bit)，NumByteToWrite:要写入的字节数(最大65535)//
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void W25QXX_Write_NoCheck(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
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{
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u16 pageremain;
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pageremain=256-WriteAddr%256; //单页剩余的字节数//
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if(NumByteToWrite<=pageremain) //判断要写入的字节数是否小于单页剩余的字节数//
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pageremain=NumByteToWrite; //如果小于，就将NumByteToWrite值赋给pageremain//
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while(1)
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{
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W25QXX_Write_Page(pBuffer,WriteAddr,pageremain); //一次写入少于256个字节的数据//
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if(NumByteToWrite==pageremain)break; //如果写入字节数小于剩余字节数，则写完//
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else
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{
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pBuffer+=pageremain;
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WriteAddr+=pageremain;
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NumByteToWrite-=pageremain; //减去已经写入了的字节数//
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if(NumByteToWrite>256)pageremain=256; //一次可以写入256个字节//
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else pageremain=NumByteToWrite; //不够256个字节//
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}
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};
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}
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//写SPI FLASH，在指定地址开始写入指定长度的数据，该函数带擦除操作//
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//pBuffer:数据存储区，WriteAddr:开始写入的地址(24bit)，NumByteToWrite:要写入的字节数(最大65535)//
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u8 W25QXX_BUFFER[4096]; //4096个字节为一个扇区，扇区是最小的擦除单位//
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void W25QXX_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
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{
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u32 secpos;
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u16 secoff;
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u16 secremain;
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u16 i;
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u8 *W25QXX_BUF;
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W25QXX_BUF=W25QXX_BUFFER;
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secpos=WriteAddr/4096; //扇区起始地址//
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secoff=WriteAddr%4096; //在该扇区内的偏移量//
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secremain=4096-secoff; //扇区剩余空间大小//
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if(NumByteToWrite<=secremain)
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secremain=NumByteToWrite; //不大于4096个字节//
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while(1)
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{
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W25QXX_Read(W25QXX_BUF,secpos*4096,4096); //读出整个扇区的内容，保存在W25QXX_BUF里//
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for(i=0;i<secremain;i++) //校验数据
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{
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if(W25QXX_BUF[secoff+i]!=0XFF)break; //判断是否需要擦除//
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}
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if(i<secremain)
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{
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W25QXX_Erase_Sector(secpos); //擦除这个扇区//
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for(i=0;i<secremain;i++)
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{
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W25QXX_BUF[i+secoff]=pBuffer[i]; //把要写的数据写到W25QXX_BUF缓存中//
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}
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W25QXX_Write_NoCheck(W25QXX_BUF,secpos*4096,4096); //一次性吧缓存W25QXX_BUFFER的数据写到对应的sector//
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}
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else
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W25QXX_Write_NoCheck(pBuffer,WriteAddr,secremain); //写已经擦除了的,直接写入扇区剩余区间//
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if(NumByteToWrite==secremain)break; //写入结束了//
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else //写入未结束//
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{
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secpos++; //扇区地址增1//
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secoff=0; //偏移位置为0//
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pBuffer+=secremain; //指针偏移//
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WriteAddr+=secremain; //写地址偏移//
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NumByteToWrite-=secremain; //字节数递减//
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if(NumByteToWrite>4096)
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secremain=4096; //下一个扇区还是写不完//
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else
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secremain=NumByteToWrite; //下一个扇区可以写完//
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}
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};
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}
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//擦除整个芯片，等待时间超长//
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void W25QXX_Erase_Chip(void)
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{
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W25QXX_Write_Enable(); //SET WEL//
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W25QXX_Wait_Busy();
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_ChipErase); //发送片擦除命令,W25X_ChipErase为0xC7//
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W25QXX_CS=1; //取消片选//
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W25QXX_Wait_Busy(); //等待芯片擦除结束//
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}
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//擦除一个扇区，Dst_Addr:扇区地址 根据实际容量设置，擦除一个扇区的最少时间:150ms//
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void W25QXX_Erase_Sector(u32 Dst_Addr)
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{
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Dst_Addr*=4096;
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W25QXX_Write_Enable(); //SET WEL//
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W25QXX_Wait_Busy();
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_SectorErase); //发送扇区擦除指令,W25X_SectorErase为0x20//
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SPI1_ReadWriteByte((u8)((Dst_Addr)>>16)); //发送24bit地址//
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SPI1_ReadWriteByte((u8)((Dst_Addr)>>8));
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SPI1_ReadWriteByte((u8)Dst_Addr);
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W25QXX_CS=1; //取消片选//
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W25QXX_Wait_Busy(); //等待擦除完成//
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}
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//等待空闲函数，只有当状态寄存器的S0位（BUSY）置0时，循环结束//
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void W25QXX_Wait_Busy(void)
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{
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while((W25QXX_ReadSR()&0x01)==0x01);
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}
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//进入掉电模式//
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void W25QXX_PowerDown(void)
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{
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_PowerDown); //发送掉电命令，W25X_PowerDown为0xB9//
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W25QXX_CS=1; //取消片选//
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delay_us(3); //等待tDP//
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}
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//唤醒，释放掉电模式//
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void W25QXX_WAKEUP(void)
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{
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W25QXX_CS=0; //使能器件//
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SPI1_ReadWriteByte(W25X_ReleasePowerDown); //发生释放掉电指令，ReleasePowerDown为0xAB//
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W25QXX_CS=1; //取消片选//
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delay_us(3); //等待TRES1//
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}
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