375 lines
9.5 KiB
C
375 lines
9.5 KiB
C
#include "stm32f4xx.h"
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#include "base.h"
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#include "w25qxx.h"
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static void (*p_delay_us)(u32);
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static int (*p_printf)(const char *,...);
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static u8 (*p_writeReadByte)(u8);
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static void (*p_csPointHigh)(void) ;
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static void (*p_csPointLow)(void);
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static u8 W25Q_INITED=0;
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static u16 W25QXX_TYPE=W25Q128; //默认是W25Q128
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//4Kbytes为一个Sector
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//16个扇区为1个Block
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//W25Q128
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//容量为16M字节,共有128个Block,4096个Sector
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//初始化SPI FLASH的IO口
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int W25QXX_Init(W25QXX_InitStruct *init)
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{
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if (init->writeReadByte&&init->csPointHigh&&init->csPointLow)
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{
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p_delay_us=init->delay_us;
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p_printf=init->printf;
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p_writeReadByte=init->writeReadByte;
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p_csPointHigh=init->csPointHigh;
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p_csPointLow=init->csPointLow;
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W25Q_INITED=1;
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}
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else
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{
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W25Q_INITED=0;
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return -1;
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}
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p_csPointHigh();
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W25QXX_TYPE=W25QXX_ReadID();//读取FLASH ID.
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return 0;
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}
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//读取W25QXX的状态寄存器
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//BIT7 6 5 4 3 2 1 0
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//SPR RV TB BP2 BP1 BP0 WEL BUSY
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//SPR:默认0,状态寄存器保护位,配合WP使用
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//TB,BP2,BP1,BP0:FLASH区域写保护设置
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//WEL:写使能锁定
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//BUSY:忙标记位(1,忙;0,空闲)
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//默认:0x00
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u8 W25QXX_ReadSR(void)
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{
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u8 byte=0;
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if (W25Q_INITED==0) return 0;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_ReadStatusReg); //发送读取状态寄存器命令
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byte=p_writeReadByte(0Xff); //读取一个字节
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p_csPointHigh(); //取消片选
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return byte;
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}
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//写W25QXX状态寄存器
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//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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if (W25Q_INITED==0) return ;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_WriteStatusReg); //发送写取状态寄存器命令
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p_writeReadByte(sr); //写入一个字节
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p_csPointHigh(); //取消片选
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}
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//W25QXX写使能
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//将WEL置位
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void W25QXX_Write_Enable(void)
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{
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if (W25Q_INITED==0) return ;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_WriteEnable); //发送写使能
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p_csPointHigh(); //取消片选
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}
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//W25QXX写禁止
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//将WEL清零
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void W25QXX_Write_Disable(void)
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{
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if (W25Q_INITED==0) return ;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_WriteDisable); //发送写禁止指令
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p_csPointHigh(); //取消片选
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}
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//读取芯片ID
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//返回值如下:
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//0XEF13,表示芯片型号为W25Q80
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//0XEF14,表示芯片型号为W25Q16
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//0XEF15,表示芯片型号为W25Q32
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//0XEF16,表示芯片型号为W25Q64
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//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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if (W25Q_INITED==0) return 0;
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p_csPointLow();
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p_writeReadByte(0x90);//发送读取ID命令
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p_writeReadByte(0x00);
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p_writeReadByte(0x00);
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p_writeReadByte(0x00);
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Temp|=p_writeReadByte(0xFF)<<8;
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Temp|=p_writeReadByte(0xFF);
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p_csPointHigh();
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return Temp;
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}
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//读取SPI FLASH
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//在指定地址开始读取指定长度的数据
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//pBuffer:数据存储区
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//ReadAddr:开始读取的地址(24bit)
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//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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if (W25Q_INITED==0) return ;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_ReadData); //发送读取命令
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p_writeReadByte((u8)((ReadAddr)>>16)); //发送24bit地址
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p_writeReadByte((u8)((ReadAddr)>>8));
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p_writeReadByte((u8)ReadAddr);
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for(i=0;i<NumByteToRead;i++)
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{
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pBuffer[i]=p_writeReadByte(0XFF); //循环读数
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}
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p_csPointHigh();
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}
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//SPI在一页(0~65535)内写入少于256个字节的数据
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//在指定地址开始写入最大256字节的数据
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//pBuffer:数据存储区
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//WriteAddr:开始写入的地址(24bit)
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//NumByteToWrite:要写入的字节数(最大256),该数不应该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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if (W25Q_INITED==0) return ;
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W25QXX_Write_Enable(); //SET WEL
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_PageProgram); //发送写页命令
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p_writeReadByte((u8)((WriteAddr)>>16)); //发送24bit地址
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p_writeReadByte((u8)((WriteAddr)>>8));
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p_writeReadByte((u8)WriteAddr);
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for(i=0;i<NumByteToWrite;i++)p_writeReadByte(pBuffer[i]); //循环写数
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p_csPointHigh(); //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SPI FLASH
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//必须确保所写的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
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//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
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//WriteAddr:开始写入的地址(24bit)
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//NumByteToWrite:要写入的字节数(最大65535)
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//CHECK OK
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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)pageremain=NumByteToWrite; //不大于256个字节
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while(1)
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{
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W25QXX_Write_Page(pBuffer,WriteAddr,pageremain);
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if(NumByteToWrite==pageremain)break; //写入结束了
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else //NumByteToWrite>pageremain
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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个字节了
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}
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};
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}
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static u8 *W25QXX_BUFFER;
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//设置工作区，至少4KB
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//成功返回0，失败返回-1
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int W25QXX_SetWorkSpace(void *buff,u32 size)
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{
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if (buff&&(size>=4096))
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{
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W25QXX_BUFFER=buff;
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return 0;
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}
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else
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{
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return -1;
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}
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}
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//清除工作区
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void W25QXX_ClearWorkSpace(void)
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{
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W25QXX_BUFFER=0;
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}
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//写SPI FLASH
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//在指定地址开始写入指定长度的数据
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//该函数带擦除操作!
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//pBuffer:数据存储区
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//WriteAddr:开始写入的地址(24bit)
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//NumByteToWrite:要写入的字节数(最大65535)
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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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if (p_writeReadByte==0) return;
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W25QXX_BUF=W25QXX_BUFFER;
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if (W25QXX_BUF==0) return;
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secpos=WriteAddr/4096;//扇区地址
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secoff=WriteAddr%4096;//在扇区内的偏移
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secremain=4096-secoff;//扇区剩余空间大小
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//printf("ad:%X,nb:%X\r\n",WriteAddr,NumByteToWrite);//测试用
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if(NumByteToWrite<=secremain)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
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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;//需要擦除
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}
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if(i<secremain)//需要擦除
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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++) //复制
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{
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W25QXX_BUF[i+secoff]=pBuffer[i];
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}
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W25QXX_Write_NoCheck(W25QXX_BUF,secpos*4096,4096);//写入整个扇区
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}else 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)secremain=4096;//下一个扇区还是写不完
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else secremain=NumByteToWrite; //下一个扇区可以写完了
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}
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};
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}
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//擦除整个芯片
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//等待时间超长...
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void W25QXX_Erase_Chip(void)
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{
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if (W25Q_INITED==0) return ;
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W25QXX_Write_Enable(); //SET WEL
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W25QXX_Wait_Busy();
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_ChipErase); //发送片擦除命令
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p_csPointHigh(); //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
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//Dst_Addr:扇区地址 根据实际容量设置
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//擦除一个山区的最少时间:150ms
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void W25QXX_Erase_Sector(u32 Dst_Addr)
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{
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//监视falsh擦除情况,测试用
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if (W25Q_INITED==0) return ;
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if (p_printf) p_printf("fe:%x\r\n",Dst_Addr);
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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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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_SectorErase); //发送扇区擦除指令
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p_writeReadByte((u8)((Dst_Addr)>>16)); //发送24bit地址
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p_writeReadByte((u8)((Dst_Addr)>>8));
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p_writeReadByte((u8)Dst_Addr);
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p_csPointHigh(); //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
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void W25QXX_Wait_Busy(void)
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{
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while((W25QXX_ReadSR()&0x01)==0x01); // 等待BUSY位清空
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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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if (W25Q_INITED==0) return ;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_PowerDown); //发送掉电命令
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p_csPointHigh(); //取消片选
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if (p_delay_us)
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p_delay_us(3); //等待TPD
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}
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//唤醒
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void W25QXX_WAKEUP(void)
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{
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if (p_writeReadByte==0) return;
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p_csPointLow(); //使能器件
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p_writeReadByte(W25X_ReleasePowerDown); // send W25X_PowerDown command 0xAB
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p_csPointHigh(); //取消片选
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if (p_delay_us)
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p_delay_us(3); //等待TRES1
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}
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//获取存储芯片的类型
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u16 W25QXX_GetType (void)
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{
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return W25QXX_TYPE;
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}
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u32 W25QXX_GetFlashSize(void)
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{
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switch (W25QXX_TYPE)
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{
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case W25Q80:
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return 1<<20;
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case W25Q16:
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return 2<<20;
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case W25Q32:
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return 4<<20;
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case W25Q64:
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return 8<<20;
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case W25Q128:
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return 16<<20;
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}
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return 0;
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}
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