spi_flash(stm32spi_flash的編程)

1、本帖最后由orange-208 于 2012-5-28 10:05 編輯void SPI_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)SPI_FLASH_Write_SR(0x02);/ 使能狀態(tài)寄存器中的寫存儲器SST25V_DBSY();SPI_FLASH_Write_SR(0x02);/ 使能狀態(tài)寄存器中的寫存儲器SST25V_DBSY();實驗?zāi)康模簩?shù)據(jù)寫入外部FLASH 中，然后再讀出來顯示在LCD 上實驗平臺：基于STM32F103C8T6 的彩屏開發(fā)板FLASH ： SST25VF016B flash_SST

2、.c#include "flash_SST.h"#include "spi.h"#include "delay.h"/4Kbytes 為一個 Sector/16 個扇區(qū)為1 個 Block/SST25VF016B容量為2M字節(jié)，共有32個Block(塊),512個Sector (扇區(qū))/初始化SPI FLASH 的 IO 口/修改狀態(tài)寄存器，允許芯片存儲器被寫void SPI_Flash_Init(void)RCC->APB2ENR|=1<<2; /PORTA 時鐘使能GPIOA->CRH&=0XFFF

3、FFF0F;GPIOA->CRH|=0X00000030;/PA9 推挽GPIOA->ODR|=1<<9;/PA9 上拉SPIx_Init();/初始化SPISPI_FLASH_Write_SR(0x02); / 使能狀態(tài)寄存器中的寫存儲器SST25V_DBSY();/讀取SPI_FLASH 的狀態(tài)寄存器/BIT7 65 4 3 2 1 0/SPR RV TB BP2 BP1 BP0 WEL BUSY/SPR:默認0,狀態(tài)寄存器保護位，配合WP使用/TB,BP2,BP1,BP0:FLASH 區(qū)域?qū)懕Ｗo設(shè)置/WEL: 寫使能鎖定/BUSY: 忙標記位(1,忙 ;0,空閑)

4、/默認:0x00u8 SPI_Flash_ReadSR(void) u8 byte=0;SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_ReadStatusReg); /發(fā)送讀取狀態(tài)寄存器命令 byte=SPIx_ReadWriteByte(0Xff);/讀取一個字節(jié)SPI_FLASH_CS=1;/取消片選return byte; /寫 SPI_FLASH 狀態(tài)寄存器/只有SPR,TB,BP2,BP1,BP0(bit 7,5,4,3,2) 可以寫 !void SPI_FLASH_Write_SR(u8 sr) SPI_FLASH_CS=0;/片選SPI

5、x_ReadWriteByte(SST25_EnableWriteStatusReg); / 使能寫狀態(tài)寄存器命令SPI_FLASH_CS=1;/取消片選SPI_FLASH_CS=0;/片選SPIx_ReadWriteByte(SST25_WriteStatusReg); /發(fā)送寫取狀態(tài)寄存器命令SPIx_ReadWriteByte(sr);/寫入一個字節(jié)SPI_FLASH_CS=1;/取消片選/SPI_FLASH 寫使能/將 WEL 置位void SPI_FLASH_Write_Enable(void)SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_

6、WriteEnable); /發(fā)送寫使能SPI_FLASH_CS=1;/取消片選 /SPI_FLASH 寫禁止/將 WEL 清零void SPI_FLASH_Write_Disable(void)SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_WriteDisable); /發(fā)送寫禁止指令SPI_FLASH_CS=1;/取消片選/讀取芯片ID SST25VF016 的是 0XBF41u16 SPI_Flash_ReadID(void)14u16 Temp = 0;SPI_FLASH_CS=0;/發(fā)送讀取ID 命令SPIx_ReadWriteByte(0

7、x90);/發(fā)送24 位的地址SPIx_ReadWriteByte(0x00);SPIx_ReadWriteByte(0x00);SPIx_ReadWriteByte(0x00);/讀取返回的16 位值Temp=SPIx_ReadWriteByte(0xFF)<<8; / 高 8 位數(shù)據(jù)Temp+=SPIx_ReadWriteByte(0xFF);/底八位數(shù)據(jù)SPI_FLASH_CS=1;return Temp;/讀取SPI FLASH/在指定地址開始讀取指定長度的數(shù)據(jù)/pBuffer: 數(shù)據(jù)存儲區(qū)/ReadAddr: 開始讀取的地址(24bit)/NumByteToRead: 要

8、讀取的字節(jié)數(shù)(最大65535 即 64k)void SPI_Flash_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead)u16 i;SPI_FLASH_CS=0;/使能器件SPIx_ReadWriteByte(SST25_ReadData);/發(fā)送讀取命令/發(fā)送24bit 地址SPIx_ReadWriteByte(u8)(ReadAddr)>>16);SPIx_ReadWriteByte(u8)(ReadAddr)>>8);SPIx_ReadWriteByte(u8)ReadAddr);for(i=0;i<NumBy

9、teToRead;i+)pBuffer=SPIx_ReadWriteByte(0XFF);/循環(huán)讀數(shù)SPI_FLASH_CS=1;/取消片選/地址自動增加的寫數(shù)據(jù)Avoid AutoAddressIncrement_WordProgramA(u8 Byte1, u8 Byte2, u32 Addr) SPI_FLASH_Write_Enable();SPI_FLASH_CS=0;SPIx_ReadWriteByte(SST25_AAI_WordProgram);/輸入所要寫數(shù)據(jù)的起始地址SPIx_ReadWriteByte(Addr & 0xFF0000) >> 16);S

10、PIx_ReadWriteByte(Addr & 0xFF00) >> 8);SPIx_ReadWriteByte(Addr & 0xFF);/發(fā)送最初的兩個數(shù)據(jù)SPIx_ReadWriteByte(Byte1);SPIx_ReadWriteByte(Byte2);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();/地址自動增加的寫數(shù)據(jù)Bvoid AutoAddressIncrement_WordProgramB(u8 state,u8 Byte1, u8 Byte2)SPI_FLASH_Write_Enable();SPI_FLASH_CS

11、=0;SPIx_ReadWriteByte(SST25_AAI_WordProgram);SPIx_ReadWriteByte(Byte1);SPIx_ReadWriteByte(Byte2);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();if(state=1)SPI_FLASH_Write_Disable();SPI_Flash_Wait_Busy();/結(jié)合AB 構(gòu)成的地址自動增加的連續(xù)數(shù)據(jù)的寫入/具有先擦除待寫區(qū)域的功能/pBuffer ：為待寫數(shù)據(jù)組/WriteAddr ：所寫數(shù)據(jù)的起始地址/NumByteToWrite ：所要寫的數(shù)據(jù)的長度void SPI

12、_Flash_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)u16 i,temp;u32 secpos;u16 secoff;u16 secremain;/以下代碼為擦除待寫區(qū)域的代碼SST25VF016secpos=WriteAddr/4096;/扇區(qū)(4K)地址 0511 forsecoff=WriteAddr96;secremain=4096-secoff;if(NumByteToWrite<secremain)temp=1;elsei=NumByteToWrite-secremain;if(i%96=0)temp=i/409

13、6+1;elsetemp=i/4096+2;for(i=0;i<temp;i+)SPI_Flash_Erase_Sector(secpos+i)*4096);/以下代碼為將數(shù)據(jù)寫入指定地址的代碼if(NumByteToWrite%2=0)temp=NumByteToWrite/2-1;else/在扇區(qū)內(nèi)的偏移/扇區(qū)剩余空間大小/剩余空間大于所存數(shù)據(jù)/剩余空間小于所存數(shù)據(jù)/判斷還占了幾個扇區(qū)/擦除將要寫入數(shù)據(jù)的扇區(qū)temp=NumByteToWrite/2;/開AutoAddressIncrement_WordProgramA(pBuffer0, pBuffer1,WriteAddr );

14、 始寫數(shù)據(jù)for(i=1;i<temp;i+)AutoAddressIncrement_WordProgramB(0,pBuffer2*i, pBuffer2*i+1);if(NumByteToWrite%2=0)/結(jié)束AutoAddressIncrement_WordProgramB(1,pBufferNumByteToWrite-2, pBufferNumByteToWrite-1);寫數(shù)據(jù)else/結(jié)AutoAddressIncrement_WordProgramB(1,pBufferNumByteToWrite-1,0);束寫數(shù)據(jù)/寫入1Byte 數(shù)據(jù)/pBuffer: 待寫的數(shù)

15、據(jù)/WriteAddr ：待寫數(shù)據(jù)的地址void Flash_WriteByte(u8* pBuffer,u32 WriteAddr) u32 secpos;secpos=WriteAddr/4096;SPI_Flash_Erase_Sector(secpos);SPI_FLASH_Write_Enable();SPI_FLASH_CS=0;SPIx_ReadWriteByte(SST25_ByteProgram );/發(fā)送24bit 地址SPIx_ReadWriteByte(u8)(WriteAddr)>>16);SPIx_ReadWriteByte(u8)(WriteAddr)

16、>>8);SPIx_ReadWriteByte(u8)WriteAddr);SPIx_ReadWriteByte(pBuffer0);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();/擦除整個芯片/整片擦除時間:/W25X16:25s/W25X32:40s/W25X64:40s/等待時間超長.void SPI_Flash_Erase_Chip(void)SPI_FLASH_Write_Enable();SPI_Flash_Wait_Busy();SPI_FLASH_CS=0;SPIx_ReadWriteByte(SST25_ChipErase);SPI_F

17、LASH_CS=1;SPI_Flash_Wait_Busy();/擦除一個扇區(qū)/Dst_Addr: 扇區(qū)地址0511 for w25x16/擦除一個山區(qū)的最少時間:150msvoid SPI_Flash_Erase_Sector(u32 Dst_Addr)SPI_FLASH_Write_Enable();SPI_Flash_Wait_Busy();/扇區(qū)地址0511 for w25x16 4096=4k/擦除這個扇區(qū)/SET WEL/使能器件/發(fā)送寫頁命令/發(fā)送待寫的數(shù)據(jù)/等待寫完成/SET WEL/使能器件/發(fā)送片擦除命令/取消片選/等待芯片擦除結(jié)束/SET WELSPI_FLASH_CS=

18、0;SPIx_ReadWriteByte(SST25_4KByte_BlockERASE);/使能器件/發(fā)送扇區(qū)擦除指令SPIx_ReadWriteByte(u8)(Dst_Addr)>>16);SPIx_ReadWriteByte(u8)(Dst_Addr)>>8);SPIx_ReadWriteByte(u8)Dst_Addr);SPI_FLASH_CS=1;SPI_Flash_Wait_Busy();/發(fā)送 24bit 地址/取消片選/等待擦除完成/等待空閑void SPI_Flash_Wait_Busy(void)while (SPI_Flash_ReadSR()

19、&0x01)=0x01);/ 等待 BUSY 位清空void SST25V_EBSY(void)SPI_FLASH_CS=0;SPIx_ReadWriteByte( SST25_EBSY);SPI_FLASH_CS=1;void SST25V_DBSY(void)SPI_FLASH_CS=0;SPIx_ReadWriteByte( SST25_DBSY);SPI_FLASH_CS=1;Flash.h#ifndef _FLASH_SST_H#define _FLASH_SST_H#include "sys.h"#defineSPI_FLASH_CS PAout(9)/

20、選中FLASH#define FLASHID 0XBF41/SST25VF016 讀寫/指令表#define SST25_ReadData0x03#define SST25_FastReadData0x0B#define SST25_4KByte_BlockERASE0x20#define SST25_32KByte_BlockErase0x52#define SST25_64KByte_BlockErase0xD8#define SST25_ChipErase0xC7#define SST25_ByteProgram0x02#define SST25_AAI_WordProgram0xAD#

21、define SST25_ReadStatusReg0x05#define SST25_EnableWriteStatusReg0x50#define SST25_WriteStatusReg0x01#define SST25_WriteEnable0x06#define SST25_WriteDisable0x04#define SST25_ManufactDeviceID0x90#define SST25_JedecDeviceID0x9F#define SST25_EBSY0x70#define SST25_DBSY0x80 void SPI_Flash_Init(void);u16 S

22、PI_Flash_ReadID(void);/讀取FLASH IDu8 SPI_Flash_ReadSR(void);/讀取狀態(tài)寄存器void SPI_FLASH_Write_SR(u8 sr);/寫狀態(tài)寄存器void SPI_FLASH_Write_Enable(void);/寫使能void SPI_FLASH_Write_Disable(void);/寫保護void SPI_Flash_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead); /讀取 flashvoid SPI_Flash_Erase_Chip(void);/整片擦除void SP

23、I_Flash_Erase_Sector(u32 Dst_Addr);/扇區(qū)擦除void SPI_Flash_Wait_Busy(void);/等待空閑void SST25V_EBSY(void);void SST25V_DBSY(void);void Flash_WriteByte(u8* pBuffer,u32 WriteAddr);/寫入 1Byte 數(shù)據(jù)void AutoAddressIncrement_WordProgramA(u8 Byte1, u8 Byte2, u32 Addr); / 地址自動增加的寫數(shù)據(jù)Avoid AutoAddressIncrement_WordProgr

24、amB(u8 state,u8 Byte1, u8 Byte2);/地址自動增加的寫數(shù)據(jù)Bvoid SPI_Flash_Write(u8 pBuffer,u32 WriteAddr,u16 NumByteToWrite);/結(jié)合AB 構(gòu)成的地址自動增加的連續(xù)數(shù)據(jù)的寫入#endif main.c主函數(shù)：#include<stm32f10x_lib.h>#include"common.h"#include"TFTLCD.h"#include"spi.h"#include"key.h"#include&quo

25、t;flash.h"const u8 TEXT_Buffer="Chen An SST25VF"#define SIZE sizeof(TEXT_Buffer)int main(void)/待寫入flash 的數(shù)據(jù)/計算待寫入數(shù)據(jù)的長度u8 key;u8 datatempSIZE;Stm32_Clock_Init(9);delay_init(72);LCD_Init();KEY_Init();SPI_Flash_Init();POINT_COLOR=RED;while(SPI_Flash_ReadID()!=FLASH_ID)/開辟空間用于存放從flash 讀回的數(shù)據(jù)/系統(tǒng)時鐘初始化/延時函數(shù)的初始化/LCD 初始化/按鍵初始化/SPI 關(guān)于 flash 的硬件接口初始化/設(shè)置字體顏色/檢驗 flash 是否存在LCD_ShowString(60,130,"SST25VF Check Failed!"); delay_ms(500);LCD_ShowString(60,130,"SST25VF Ready!");LCD_ShowString