stm32基于HAL库驱动外部SPI flash制作虚拟U盘
- 📌参考文章：
https://xiaozhuanlan.com/topic/6058234791 - 🎞实现效果演示：
- 🔖上图中的读到的
FLASH_ID所指的是针对不同容量，所对应的ID。
//W25X/Q不同容量对应不同ID关系
W25Q80 ID 0XEF13
W25Q16 ID 0XEF14
W25Q32 ID 0XEF15
W25Q64 ID 0XEF16
W25Q128 ID 0XEF17
W25Q256 ID 0XEF18
- 🔖在电脑端，支持对虚拟出来的存储器进行读写操作。
- ✨如果设计成一块PCB，可以制作成一个微小容量的移动U盘。
- 🌿基于STM32F103，HAL库生成的代码，可以移植到任意支持USB接口的STM32单片机上使用。
- 🌿程序烧录后，通过PA11/PA12 USB初次连接电脑，会弹出提示格式化窗口。之后就可以使用，包括拷贝和创建文件到盘符内，保存数据后，拔插设备，数据不丢失。
stm32cumx配置
-
🌿stm32cumx使能对应的SPI接口
-
✨串口非必须，只是方便调试时查看读取是否支持。
-
🌿使能SPI接口：（尽量将SPI速度配置低一点，防止访问和写入出错）
-
🌿配置SPI CS（片选）引脚：
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🌿使能USB外设：
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🌿时钟配置为48MHz：
- 🌿使能调试接口
- 🌿勾选中间件：
- 🌿调整堆栈区大小：
🛠Keil工程修改
- 🌿导入驱动文件：
bsp_spi_flash.c和bsp_spi_flash.h到工程对应文件夹下：
- 🌿修改
usbd_storage_if.c文件内容：
/* USER CODE BEGIN INCLUDE */
#include "bsp_spi_flash.h" //将驱动头文件包含进来
/* USER CODE END INCLUDE */
//注释掉自动生成的以下3个宏定义
//#define STORAGE_LUN_NBR 1
//#define STORAGE_BLK_NBR 0x10000
//#define STORAGE_BLK_SIZ 0x200/* USER CODE BEGIN PRIVATE_DEFINES */
//重新定义以下3个宏
#define STORAGE_LUN_NBR 1
#define STORAGE_BLK_NBR 2048 //块数量：256*8扇区=8MByte
#define STORAGE_BLK_SIZ 4096 //每个扇区4096Byte
/* USER CODE END PRIVATE_DEFINES */
- ✨这里的
STORAGE_BLK_NBR宏代表，外部SPI FLASH 容量大小，2048代表为8MB，如果spi flash容量为16MB，那么这里就是4096.以此类推，4MB spi flash就是1024
- 📑补充以下函数内容：（
usbd_storage_if.c文件内）
int8_t STORAGE_Init_FS(uint8_t lun)
{/* USER CODE BEGIN 2 */W25QXX_Init();return (USBD_OK);/* USER CODE END 2 */
}int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size)
{/* USER CODE BEGIN 3 */*block_num = STORAGE_BLK_NBR;*block_size = STORAGE_BLK_SIZ;return (USBD_OK);/* USER CODE END 3 */
}int8_t STORAGE_IsReady_FS(uint8_t lun)
{/* USER CODE BEGIN 4 */u16 flash_ID;flash_ID =W25QXX_ReadID();printf("flash_ID:%d \r\n",flash_ID);//非必须，如需要调试，包含stdio.h头文件，启用串口return (USBD_OK);/* USER CODE END 4 */
}int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{/* USER CODE BEGIN 6 */blk_addr += SPI_FLASH_START_SECTOR;SPI_FLASH_BufferRead(buf, blk_addr * SPI_FLASH_SECTOR_SIZE, blk_len * SPI_FLASH_SECTOR_SIZE);return (USBD_OK);/* USER CODE END 6 */
}
int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{/* USER CODE BEGIN 7 */uint32_t write_addr;blk_addr +=SPI_FLASH_START_SECTOR;write_addr = blk_addr * SPI_FLASH_SECTOR_SIZE;SPI_FLASH_SectorErase(write_addr);SPI_FLASH_BufferWrite((uint8_t*)buf, write_addr, blk_len * SPI_FLASH_SECTOR_SIZE);return (USBD_OK);/* USER CODE END 7 */
}int8_t STORAGE_GetMaxLun_FS(void)
{/* USER CODE BEGIN 8 */return (STORAGE_LUN_NBR - 1);/* USER CODE END 8 */
}
- main.c文件
/* USER CODE BEGIN Includes */
#include "bsp_spi_flash.h"
#include "stdio.h"//用于调试串口输出
/* USER CODE END Includes */
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_SPI1_Init();MX_USB_DEVICE_Init();MX_USART1_UART_Init();/* USER CODE BEGIN 2 */W25QXX_Init();//初始化/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}📝驱动文件
- 📗
bsp_spi_flash.h内容
#ifndef __SPI_FLASH_H
#define __SPI_FLASH_H#include "stm32f1xx.h"
#include "stm32f1xx_hal_spi.h"/* ???????? ----------------------------------------------------------------*/
#include "stm32f1xx_hal.h"typedef uint32_t u32;
typedef uint8_t u8;//
typedef uint16_t u16;#define SPI_FLASH_REBUILD 0 //1:???????????Flash??0??????????????Flash
#define SPI_FLASH_SECTOR_SIZE 4096 // ????Flash????????
#define SPI_FLASH_START_SECTOR 256*4 // ????Flash?????FatFS?????
#define SPI_FLASH_SECTOR_COUNT 256 // ????Flash?????FatFS???????????
//W25X/Q不同容量对应不同ID关系
//W25Q80 ID 0XEF13
//W25Q16 ID 0XEF14
//W25Q32 ID 0XEF15
//W25Q64 ID 0XEF16
//W25Q128 ID 0XEF17
//W25Q256 ID 0XEF18
//#define W25Q80 0XEF13
//#define W25Q16 0XEF14
//#define W25Q32 0XEF15
#define W25Q64 0XEF16
//#define W25Q128 0XEF17
//#define W25Q256 0XEF18
//#define sFLASH_ID 0XEF4017 //W25Q64
#define sFLASH_ID 0XEF16
extern SPI_HandleTypeDef hspi1;
extern u16 W25QXX_TYPE; //????W25QXX??????//#define W25QXX_CS PBout(12) //W25QXX片选引脚
#define W25QXX_CS_1 HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_SET)
#define W25QXX_CS_0 HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_RESET)#define W25X_WriteEnable 0x06
#define W25X_WriteDisable 0x04
#define W25X_ReadStatusReg1 0x05
#define W25X_ReadStatusReg2 0x35
#define W25X_ReadStatusReg3 0x15
#define W25X_WriteStatusReg1 0x01
#define W25X_WriteStatusReg2 0x31
#define W25X_WriteStatusReg3 0x11
#define W25X_ReadData 0x03
#define W25X_FastReadData 0x0B
#define W25X_FastReadDual 0x3B
#define W25X_PageProgram 0x02
#define W25X_BlockErase 0xD8
#define W25X_SectorErase 0x20
#define W25X_ChipErase 0xC7
#define W25X_PowerDown 0xB9
#define W25X_ReleasePowerDown 0xAB
#define W25X_DeviceID 0xAB
#define W25X_ManufactDeviceID 0x90
#define W25X_JedecDeviceID 0x9F
#define W25X_Enable4ByteAddr 0xB7
#define W25X_Exit4ByteAddr 0xE9void W25QXX_Init(void);
u16 W25QXX_ReadID(void); //???FLASH ID
void W25QXX_WAKEUP(void); //????
void SPI_FLASH_SectorErase(u32 SectorAddr);
void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite);
void SPI_FLASH_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead);
void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite);
#endif /* __SPI_FLASH_H */- 📓
bsp_spi_flash.c内容
#include "bsp_spi_flash.h"
//需要重新添加代码
#include "stm32f1xx_hal_gpio.h"
#include "stdio.h"u16 W25QXX_TYPE = W25Q64; //设置SPI存储器型号extern SPI_HandleTypeDef hspi1;u8 W25QXX_ReadSR(u8 regno); //??????????
void W25QXX_4ByteAddr_Enable(void); //???4???????
void W25QXX_Write_SR(u8 regno,u8 sr); //?????????
void W25QXX_Write_Enable(void); //?????
void W25QXX_Write_Disable(void); //??????
void W25QXX_Write_NoCheck(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite);
void W25QXX_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead); //???flash
void W25QXX_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite);//????flash
void W25QXX_Erase_Chip(void); //???????
void W25QXX_Erase_Sector(u32 Dst_Addr); //????????
void W25QXX_Wait_Busy(void); //???????
void W25QXX_PowerDown(void); //?????????//SPI1 读写一个字节
//TxData:要写入的字节
//返回值:读取到的字节
u8 SPI2_ReadWriteByte(u8 TxData)
{u8 Rxdata;HAL_SPI_TransmitReceive(&hspi1,&TxData,&Rxdata,1, 1000);return Rxdata; //返回收到的数据
}void SPI2_SetSpeed(u8 SPI_BaudRatePrescaler)
{assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));//判断有效性__HAL_SPI_DISABLE(&hspi1); //关闭SPIhspi1.Instance->CR1&=0XFFC7; //位3-5清零，用来设置波特率hspi1.Instance->CR1|=SPI_BaudRatePrescaler;//设置SPI速度__HAL_SPI_ENABLE(&hspi1); //使能SPI}//初始化SPI FLASH的IO口
void W25QXX_Init(void)
{u8 temp;GPIO_InitTypeDef GPIO_Initure;// __HAL_RCC_GPIOB_CLK_ENABLE(); //使能GPIOB时钟__HAL_RCC_GPIOA_CLK_ENABLE(); //使能GPIOB时钟//PA4GPIO_Initure.Pin=GPIO_PIN_4; //PA4GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP; //推挽输出GPIO_Initure.Pull=GPIO_PULLUP; //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;//高速 HAL_GPIO_Init(GPIOA,&GPIO_Initure); //初始化W25QXX_CS_1; //SPI FLASH不选中
// SPI2_Init(); //初始化SPISPI2_SetSpeed(SPI_BAUDRATEPRESCALER_2); //设置为42M时钟,高速模式W25QXX_TYPE = W25QXX_ReadID(); //读取FLASH ID.printf("flash_ID:%d \r\n",W25QXX_TYPE);
// if(W25QXX_TYPE==W25Q64) //SPI FLASH为W25Q32
// {temp=W25QXX_ReadSR(3); //读取状态寄存器3，判断地址模式if((temp&0X01)==0) //如果不是4字节地址模式,则进入4字节地址模式{W25QXX_CS_0; //选中SPI2_ReadWriteByte(W25X_Enable4ByteAddr);//发送进入4字节地址模式指令 W25QXX_CS_1; //取消片选 }
// }
}
//读取W25QXX的状态寄存器，W25QXX一共有3个状态寄存器
//状态寄存器1：
//BIT7 6 5 4 3 2 1 0
//SPR RV TB BP2 BP1 BP0 WEL BUSY
//SPR:默认0,状态寄存器保护位,配合WP使用
//TB,BP2,BP1,BP0:FLASH区域写保护设置
//WEL:写使能锁定
//BUSY:忙标记位(1,忙;0,空闲)
//默认:0x00
//状态寄存器2：
//BIT7 6 5 4 3 2 1 0
//SUS CMP LB3 LB2 LB1 (R) QE SRP1
//状态寄存器3：
//BIT7 6 5 4 3 2 1 0
//HOLD/RST DRV1 DRV0 (R) (R) WPS ADP ADS
//regno:状态寄存器号，范:1~3
//返回值:状态寄存器值
u8 W25QXX_ReadSR(u8 regno)
{u8 byte=0,command=0;switch(regno){case 1:command=W25X_ReadStatusReg1; //读状态寄存器1指令break;case 2:command=W25X_ReadStatusReg2; //读状态寄存器2指令break;case 3:command=W25X_ReadStatusReg3; //读状态寄存器3指令break;default:command=W25X_ReadStatusReg1;break;}W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(command); //发送读取状态寄存器命令byte=SPI2_ReadWriteByte(0Xff); //读取一个字节W25QXX_CS_1; //取消片选return byte;
}
//写W25QXX状态寄存器
void W25QXX_Write_SR(u8 regno,u8 sr)
{u8 command=0;switch(regno){case 1:command=W25X_WriteStatusReg1; //写状态寄存器1指令break;case 2:command=W25X_WriteStatusReg2; //写状态寄存器2指令break;case 3:command=W25X_WriteStatusReg3; //写状态寄存器3指令break;default:command=W25X_WriteStatusReg1;break;}W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(command); //发送写取状态寄存器命令SPI2_ReadWriteByte(sr); //写入一个字节W25QXX_CS_1; //取消片选
}
//W25QXX写使能
//将WEL置位
void W25QXX_Write_Enable(void)
{W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_WriteEnable); //发送写使能W25QXX_CS_1; //取消片选
}
//W25QXX写禁止
//将WEL清零
void W25QXX_Write_Disable(void)
{W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_WriteDisable); //发送写禁止指令W25QXX_CS_1; //取消片选
}//读取芯片ID
//返回值如下:
//0XEF13,表示芯片型号为W25Q80
//0XEF14,表示芯片型号为W25Q16
//0XEF15,表示芯片型号为W25Q32
//0XEF16,表示芯片型号为W25Q64
//0XEF17,表示芯片型号为W25Q128
//0XEF18,表示芯片型号为W25Q256
u16 W25QXX_ReadID(void)
{u16 Temp = 0;W25QXX_CS_0;SPI2_ReadWriteByte(0x90);//发送读取ID命令SPI2_ReadWriteByte(0x00);SPI2_ReadWriteByte(0x00);SPI2_ReadWriteByte(0x00);Temp|=SPI2_ReadWriteByte(0xFF)<<8;Temp|=SPI2_ReadWriteByte(0xFF);W25QXX_CS_1;return Temp;
}
//读取SPI FLASH
//在指定地址开始读取指定长度的数据
//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)
void W25QXX_Read(u8* pBuffer,u32 ReadAddr,u16 NumByteToRead)
{u16 i;W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_ReadData); //发送读取命令
// if(W25QXX_TYPE == W25Q256) //如果是W25Q256的话地址为4字节的，要发送最高8位
// {
// SPI2_ReadWriteByte((u8)((ReadAddr)>>24));
// }SPI2_ReadWriteByte((u8)((ReadAddr)>>16)); //发送24bit地址SPI2_ReadWriteByte((u8)((ReadAddr)>>8));SPI2_ReadWriteByte((u8)ReadAddr);for(i=0;i<NumByteToRead;i++){pBuffer[i]=SPI2_ReadWriteByte(0XFF); //循环读数}W25QXX_CS_1;
}
/**
* @brief 读取FLASH数据
* @param pBuffer，存储读出数据的指针
* @param ReadAddr，读取地址
* @param NumByteToRead，读取数据长度
* @retval 无
*/
void SPI_FLASH_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead)
{/* 选择FLASH: CS低电平 */W25QXX_CS_0;/* 发送 读 指令 */SPI2_ReadWriteByte(W25X_ReadData);/* 发送 读 地址高位 */SPI2_ReadWriteByte((ReadAddr & 0xFF0000) >> 16);/* 发送 读 地址中位 */SPI2_ReadWriteByte((ReadAddr& 0xFF00) >> 8);/* 发送 读 地址低位 */SPI2_ReadWriteByte(ReadAddr & 0xFF);/* 读取数据 */while (NumByteToRead--) /* while there is data to be read */{/* 读取一个字节*/*pBuffer = SPI2_ReadWriteByte(0xFF);/* 指向下一个字节缓冲区 */pBuffer++;}/* 停止信号 FLASH: CS 高电平 */W25QXX_CS_1;
}
#define WIP_Flag 0x01/*** @brief 等待WIP(BUSY)标志被置0，即等待到FLASH内部数据写入完毕* @param none* @retval none*/
void SPI_FLASH_WaitForWriteEnd(void)
{u8 FLASH_Status = 0;/* 选择 FLASH: CS 低 */W25QXX_CS_0;/* 发送 读状态寄存器 命令 */SPI2_ReadWriteByte(W25X_ReadStatusReg1);/* 若FLASH忙碌，则等待 */do{/* 读取FLASH芯片的状态寄存器 */FLASH_Status = SPI2_ReadWriteByte(0xFF);}while ((FLASH_Status & WIP_Flag) == SET); /* 正在写入标志 *//* 停止信号 FLASH: CS 高 */W25QXX_CS_1;
}/*** @brief 擦除FLASH扇区* @param SectorAddr：要擦除的扇区地址* @retval 无*/
void SPI_FLASH_SectorErase(u32 SectorAddr)
{/* 发送FLASH写使能命令 */W25QXX_Write_Enable();SPI_FLASH_WaitForWriteEnd();/* 擦除扇区 *//* 选择FLASH: CS低电平 */W25QXX_CS_0;/* 发送扇区擦除指令*/SPI2_ReadWriteByte(W25X_SectorErase);/*发送擦除扇区地址的高位*/SPI2_ReadWriteByte((u8)((SectorAddr)>>16)); //发送24bit地址SPI2_ReadWriteByte((u8)((SectorAddr)>>8));/* 发送擦除扇区地址的低位 */SPI2_ReadWriteByte(SectorAddr & 0xFF);/* 停止信号 FLASH: CS 高电平 */W25QXX_CS_1;/* 等待擦除完毕*/SPI_FLASH_WaitForWriteEnd();
}
/* WIP(busy)标志，FLASH内部正在写入 */#define SPI_FLASH_PageSize 256
#define SPI_FLASH_PerWritePageSize 256
/*** @brief 对FLASH按页写入数据，调用本函数写入数据前需要先擦除扇区* @param pBuffer，要写入数据的指针* @param WriteAddr，写入地址* @param NumByteToWrite，写入数据长度，必须小于等于SPI_FLASH_PerWritePageSize* @retval 无*/
void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{/* 发送FLASH写使能命令 */W25QXX_Write_Enable();/* 选择FLASH: CS低电平 */W25QXX_CS_0;/* 写页写指令*/SPI2_ReadWriteByte(W25X_PageProgram);/*发送写地址的高位*/SPI2_ReadWriteByte((WriteAddr & 0xFF0000) >> 16);/*发送写地址的中位*/SPI2_ReadWriteByte((WriteAddr & 0xFF00) >> 8);/*发送写地址的低位*/SPI2_ReadWriteByte(WriteAddr & 0xFF);if(NumByteToWrite > SPI_FLASH_PageSize){NumByteToWrite = SPI_FLASH_PerWritePageSize;//FLASH_ERROR("SPI_FLASH_PageWrite too large!");}/* 写入数据*/while (NumByteToWrite--){/* 发送当前要写入的字节数据 */SPI2_ReadWriteByte(*pBuffer);/* 指向下一字节数据 */pBuffer++;}/* 停止信号 FLASH: CS 高电平 */W25QXX_CS_1;/* 等待写入完毕*/SPI_FLASH_WaitForWriteEnd();
}//SPI在一页(0~65535)内写入少于256个字节的数据
//在指定地址开始写入最大256字节的数据
//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),该数不应该超过该页的剩余字节数!!!
void W25QXX_Write_Page(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
{u16 i;W25QXX_Write_Enable(); //SET WELW25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_PageProgram); //发送写页命令
// if(W25QXX_TYPE==W25Q256) //如果是W25Q256的话地址为4字节的，要发送最高8位
// {
// SPI2_ReadWriteByte((u8)((WriteAddr)>>24));
// }SPI2_ReadWriteByte((u8)((WriteAddr)>>16)); //发送24bit地址SPI2_ReadWriteByte((u8)((WriteAddr)>>8));SPI2_ReadWriteByte((u8)WriteAddr);for(i=0;i<NumByteToWrite;i++)SPI2_ReadWriteByte(pBuffer[i]);//循环写数W25QXX_CS_1; //取消片选SPI_FLASH_WaitForWriteEnd(); //等待写入结束
}/*** @brief 对FLASH写入数据，调用本函数写入数据前需要先擦除扇区* @param pBuffer，要写入数据的指针* @param WriteAddr，写入地址* @param NumByteToWrite，写入数据长度* @retval 无*/
void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;/*mod运算求余，若writeAddr是SPI_FLASH_PageSize整数倍，运算结果Addr值为0*/Addr = WriteAddr % SPI_FLASH_PageSize;/*差count个数据值，刚好可以对齐到页地址*/count = SPI_FLASH_PageSize - Addr;/*计算出要写多少整数页*/NumOfPage = NumByteToWrite / SPI_FLASH_PageSize;/*mod运算求余，计算出剩余不满一页的字节数*/NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;/* Addr=0,则WriteAddr 刚好按页对齐 aligned */if (Addr == 0){/* NumByteToWrite < SPI_FLASH_PageSize */if (NumOfPage == 0){SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);}else /* NumByteToWrite > SPI_FLASH_PageSize */{/*先把整数页都写了*/while (NumOfPage--){SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);WriteAddr += SPI_FLASH_PageSize;pBuffer += SPI_FLASH_PageSize;}/*若有多余的不满一页的数据，把它写完*/SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);}}/* 若地址与 SPI_FLASH_PageSize 不对齐 */else{/* NumByteToWrite < SPI_FLASH_PageSize */if (NumOfPage == 0){/*当前页剩余的count个位置比NumOfSingle小，一页写不完*/if (NumOfSingle > count){temp = NumOfSingle - count;/*先写满当前页*/SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);WriteAddr += count;pBuffer += count;/*再写剩余的数据*/SPI_FLASH_PageWrite(pBuffer, WriteAddr, temp);}else /*当前页剩余的count个位置能写完NumOfSingle个数据*/{SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);}}else /* NumByteToWrite > SPI_FLASH_PageSize */{/*地址不对齐多出的count分开处理，不加入这个运算*/NumByteToWrite -= count;NumOfPage = NumByteToWrite / SPI_FLASH_PageSize;NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;/* 先写完count个数据，为的是让下一次要写的地址对齐 */SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);/* 接下来就重复地址对齐的情况 */WriteAddr += count;pBuffer += count;/*把整数页都写了*/while (NumOfPage--){SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);WriteAddr += SPI_FLASH_PageSize;pBuffer += SPI_FLASH_PageSize;}/*若有多余的不满一页的数据，把它写完*/if (NumOfSingle != 0){SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);}}}
}//无检验写SPI FLASH
//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!
//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!
//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)
//CHECK OK
void W25QXX_Write_NoCheck(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
{u16 pageremain;pageremain=256-WriteAddr%256; //单页剩余的字节数if(NumByteToWrite<=pageremain)pageremain=NumByteToWrite;//不大于256个字节while(1){W25QXX_Write_Page(pBuffer,WriteAddr,pageremain);if(NumByteToWrite==pageremain)break;//写入结束了else //NumByteToWrite>pageremain{pBuffer+=pageremain;WriteAddr+=pageremain;NumByteToWrite-=pageremain; //减去已经写入了的字节数if(NumByteToWrite>256)pageremain=256; //一次可以写入256个字节else pageremain=NumByteToWrite; //不够256个字节了}};
}
//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!
//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)
u8 W25QXX_BUFFER[4096];
void W25QXX_Write(u8* pBuffer,u32 WriteAddr,u16 NumByteToWrite)
{u32 secpos;u16 secoff;u16 secremain;u16 i;u8 * W25QXX_BUF;W25QXX_BUF=W25QXX_BUFFER;secpos=WriteAddr/4096;//扇区地址secoff=WriteAddr%4096;//在扇区内的偏移secremain=4096-secoff;//扇区剩余空间大小//printf("ad:%X,nb:%X\r\n",WriteAddr,NumByteToWrite);//测试用if(NumByteToWrite<=secremain)secremain=NumByteToWrite;//不大于4096个字节while(1){W25QXX_Read(W25QXX_BUF,secpos*4096,4096);//读出整个扇区的内容for(i=0;i<secremain;i++)//校验数据{if(W25QXX_BUF[secoff+i]!=0XFF)break;//需要擦除}if(i<secremain)//需要擦除{W25QXX_Erase_Sector(secpos);//擦除这个扇区for(i=0;i<secremain;i++) //复制{W25QXX_BUF[i+secoff]=pBuffer[i];}W25QXX_Write_NoCheck(W25QXX_BUF,secpos*4096,4096);//写入整个扇区}else W25QXX_Write_NoCheck(pBuffer,WriteAddr,secremain);//写已经擦除了的,直接写入扇区剩余区间.if(NumByteToWrite==secremain)break;//写入结束了else//写入未结束{secpos++;//扇区地址增1secoff=0;//偏移位置为0pBuffer+=secremain; //指针偏移WriteAddr+=secremain;//写地址偏移NumByteToWrite-=secremain; //字节数递减if(NumByteToWrite>4096)secremain=4096; //下一个扇区还是写不完else secremain=NumByteToWrite; //下一个扇区可以写完了}};
}
//擦除整个芯片
//等待时间超长...
void W25QXX_Erase_Chip(void)
{W25QXX_Write_Enable(); //SET WELW25QXX_Wait_Busy();W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_ChipErase); //发送片擦除命令W25QXX_CS_1; //取消片选W25QXX_Wait_Busy(); //等待芯片擦除结束
}
//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
void W25QXX_Erase_Sector(u32 Dst_Addr)
{//监视falsh擦除情况,测试用//printf("fe:%x\r\n",Dst_Addr);Dst_Addr*=4096;W25QXX_Write_Enable(); //SET WELW25QXX_Wait_Busy();W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_SectorErase); //发送扇区擦除指令if(W25QXX_TYPE==W25Q64) //如果是W25Q256的话地址为4字节的，要发送最高8位{SPI2_ReadWriteByte((u8)((Dst_Addr)>>24));}SPI2_ReadWriteByte((u8)((Dst_Addr)>>16)); //发送24bit地址SPI2_ReadWriteByte((u8)((Dst_Addr)>>8));SPI2_ReadWriteByte((u8)Dst_Addr);W25QXX_CS_1; //取消片选W25QXX_Wait_Busy(); //等待擦除完成
}
//等待空闲
void W25QXX_Wait_Busy(void)
{while((W25QXX_ReadSR(1)&0x01)==0x01); // 等待BUSY位清空
}
//进入掉电模式
void W25QXX_PowerDown(void)
{W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_PowerDown); //发送掉电命令W25QXX_CS_1; //取消片选//delay_us(3); //等待TPD
}
//唤醒
void W25QXX_WAKEUP(void)
{W25QXX_CS_0; //使能器件SPI2_ReadWriteByte(W25X_ReleasePowerDown); // send W25X_PowerDown command 0xABW25QXX_CS_1; //取消片选//delay_us(3); //等待TRES1
}📚工程源码
链接：https://pan.baidu.com/s/164MW7mOR8fnaHZUC0dt7SQ
提取码：0nei
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