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其实本身是很容易实现的，但中途遇到了一个以往较少注意到的问题：堆栈空间。
参考这个：https://www.cnblogs.com/qsyll0916/p/8013136.html
总的来说，就是因为堆空间分配不足，导致没有足够的空间给USB作缓冲。这个问题网上很多人遇到过，但是
解决这问题帖子没找到。原子的HAL例程是将FLASH当成512字节扇区进行读写的，原因是为了同时挂载SD卡（512）
而堆空间STM32默认就是0x200，512字节。所以原子哥没有遇到这问题。至于硬石的代码，我发现他的程序
误以为USB缓冲使用的是栈空间，当然，实际上使用的是堆空间。所以他修改了启动文件的堆栈大小为：
Stack_Size EQU 0x1200
Heap_Size EQU 0x200
正确应为：
Stack_Size EQU 0x200
Heap_Size EQU 0x1200
因此，硬石的教程里面没有USB串行FLASH模拟U盘的章节，我猜测他是没调通这个功能，哈哈。
言归正传，STM32CubeMX配置图：
我的FLASH是复用SPI1，PB3、4、5引脚。CS引脚为PB0
USB：选择Device Only ， Mass Storage Class这两个选项
RCC与SYS：SWD下载程序，以及选择外部晶振
PA6、PA7：这个是我板子上的两个LED的接口，不用理会。
SPI1复用PB3、4、5：先点PB3，然后在弹出的选项中选择SPI1_SCK，PB4、5方法相同
然后再在左边选项卡开启SPI1，这样SPI1就复用到PB3、4、5了。
时钟树配置：这个不贴图了，配制成正确的时钟就好。
Configuration:
首先修改SPI1的CS引脚，因为默认SPI1是软件控制的，我使用了PB0控制它：
USB Configuration
这里修改了USB读/写缓冲区的大小，设为4096。因为我的串行FLASH的扇区为4096字节。
当然，如果是SD卡，使用默认的512就可以了。
Project -> Setting
我使用的是MDK，文件名进行了修改，然后修改了堆的大小。
Code Generator：
把这个勾选上，不同外设建立不同.c .h文件。
至此，修改完成，可以生成代码了。
生成代码后，将DeBug里面，Flash Download的Reset And Run勾上，因为生成的工程默认不勾。
还有在Target里面：Use MicroLIB
使用微软的库，这个默认是勾上的。你不用它的库也可以手动取消掉。
生成的代码文件里面，主要修改："usbd_storage_if.c"
/**
******************************************************************************
* @file : usbd_storage_if.c
* @version : v1.0_Cube
* @brief : Memory management layer.
******************************************************************************
* This notice applies to any and all portions of this file
* that are not between comment pairs USER CODE BEGIN and
* USER CODE END. Other portions of this file, whether
* inserted by the user or by software development tools
* are owned by their respective copyright owners.
*
* Copyright (c) 2018 STMicroelectronics International N.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "usbd_storage_if.h"
#include "spi.h"
/* USER CODE BEGIN INCLUDE */
/* USER CODE END INCLUDE */
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
/* USER CODE END PV */
/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
* @brief Usb device.
* @{
*/
/** @defgroup USBD_STORAGE
* @brief Usb mass storage device module
* @{
*/
/** @defgroup USBD_STORAGE_Private_TypesDefinitions
* @brief Private types.
* @{
*/
/* USER CODE BEGIN PRIVATE_TYPES */
/* USER CODE END PRIVATE_TYPES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_Defines
* @brief Private defines.
* @{
*/
#define STORAGE_LUN_NBR 1
#define STORAGE_BLK_NBR 512
#define STORAGE_BLK_SIZ 4096
/* USER CODE BEGIN PRIVATE_DEFINES */
/* USER CODE END PRIVATE_DEFINES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_Macros
* @brief Private macros.
* @{
*/
/* USER CODE BEGIN PRIVATE_MACRO */
/* USER CODE END PRIVATE_MACRO */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_Variables
* @brief Private variables.
* @{
*/
/* USER CODE BEGIN INQUIRY_DATA_FS */
/** USB Mass storage Standard Inquiry Data. */
const int8_t STORAGE_Inquirydata_FS[] = {/* 36 */
/* LUN 0 */
0x00,
0x80,
0x02,
0x02,
(STANDARD_INQUIRY_DATA_LEN - 5),
0x00,
0x00,
0x00,
'S', 'T', 'M', ' ', ' ', ' ', ' ', ' ', /* Manufacturer : 8 bytes */
'P', 'r', 'o', 'd', 'u', 'c', 't', ' ', /* Product : 16 Bytes */
' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
'0', '.', '0' ,'1' /* Version : 4 Bytes */
};
/* USER CODE END INQUIRY_DATA_FS */
/* USER CODE BEGIN PRIVATE_VARIABLES */
/* USER CODE END PRIVATE_VARIABLES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Exported_Variables
* @brief Public variables.
* @{
*/
extern USBD_HandleTypeDef hUsbDeviceFS;
/* USER CODE BEGIN EXPORTED_VARIABLES */
/* USER CODE END EXPORTED_VARIABLES */
/**
* @}
*/
/** @defgroup USBD_STORAGE_Private_FunctionPrototypes
* @brief Private functions declaration.
* @{
*/
static int8_t STORAGE_Init_FS(uint8_t lun);
static int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size);
static int8_t STORAGE_IsReady_FS(uint8_t lun);
static int8_t STORAGE_IsWriteProtected_FS(uint8_t lun);
static int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len);
static int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len);
static int8_t STORAGE_GetMaxLun_FS(void);
/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */
/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */
/**
* @}
*/
USBD_StorageTypeDef USBD_Storage_Interface_fops_FS =
{
STORAGE_Init_FS,
STORAGE_GetCapacity_FS,
STORAGE_IsReady_FS,
STORAGE_IsWriteProtected_FS,
STORAGE_Read_FS,
STORAGE_Write_FS,
STORAGE_GetMaxLun_FS,
(int8_t *)STORAGE_Inquirydata_FS
};
/* Private functions ---------------------------------------------------------*/
/**
* @brief Initializes over USB FS IP
* @param lun:
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Init_FS(uint8_t lun)
{
/* USER CODE BEGIN 2 */
return (USBD_OK);
/* USER CODE END 2 */
}
/**
* @brief .
* @param lun: .
* @param block_num: .
* @param block_size: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
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 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_IsReady_FS(uint8_t lun)
{
if(SPI_FLASH_ReadID() == FLASH_ID)
return (USBD_OK);
else
return -1;
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_IsWriteProtected_FS(uint8_t lun)
{
/* USER CODE BEGIN 5 */
return (USBD_OK);
/* USER CODE END 5 */
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
SPI_FLASH_BufferRead(buf, blk_addr*STORAGE_BLK_SIZ, blk_len*STORAGE_BLK_SIZ);
return (USBD_OK);
}
/**
* @brief .
* @param lun: .
* @retval USBD_OK if all operations are OK else USBD_FAIL
*/
int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
SPI_FLASH_SectorErase(blk_addr*STORAGE_BLK_SIZ);
SPI_FLASH_BufferWrite(buf, blk_addr*STORAGE_BLK_SIZ,blk_len*STORAGE_BLK_SIZ);
return (USBD_OK);
}
/**
* @brief .
* @param None
* @retval .
*/
int8_t STORAGE_GetMaxLun_FS(void)
{
/* USER CODE BEGIN 8 */
return (STORAGE_LUN_NBR - 1);
/* USER CODE END 8 */
}
/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */
/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
底层的SPI FLASH的函数，需要自己构建，我的代码如下：
/**
******************************************************************************
* File Name : SPI.c
* Description : This file provides code for the configuration
* of the SPI instances.
******************************************************************************
* This notice applies to any and all portions of this file
* that are not between comment pairs USER CODE BEGIN and
* USER CODE END. Other portions of this file, whether
* inserted by the user or by software development tools
* are owned by their respective copyright owners.
*
* Copyright (c) 2018 STMicroelectronics International N.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "spi.h"
#include "gpio.h"
#define SPI_FLASH_PageSize 256
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
SPI_HandleTypeDef hspi1;
uint8_t d_read,d_send;
/* SPI1 init function */
void MX_SPI1_Init(void)
{
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 10;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(spiHandle->Instance==SPI1)
{
/* USER CODE BEGIN SPI1_MspInit 0 */
/* USER CODE END SPI1_MspInit 0 */
/* SPI1 clock enable */
__HAL_RCC_SPI1_CLK_ENABLE();
/**SPI1 GPIO Configuration
PB3 ------> SPI1_SCK
PB4 ------> SPI1_MISO
PB5 ------> SPI1_MOSI
*/
GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN SPI1_MspInit 1 */
/* USER CODE END SPI1_MspInit 1 */
}
}
void HAL_SPI_MspDeInit(SPI_HandleTypeDef* spiHandle)
{
if(spiHandle->Instance==SPI1)
{
/* USER CODE BEGIN SPI1_MspDeInit 0 */
/* USER CODE END SPI1_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_SPI1_CLK_DISABLE();
/**SPI1 GPIO Configuration
PB3 ------> SPI1_SCK
PB4 ------> SPI1_MISO
PB5 ------> SPI1_MOSI
*/
HAL_GPIO_DeInit(GPIOB, GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5);
/* USER CODE BEGIN SPI1_MspDeInit 1 */
/* USER CODE END SPI1_MspDeInit 1 */
}
}
/********************************************FLASH API********************************************************/
//函数功能: 从串行Flash读取一个字节数据
uint8_t SPI_FLASH_ReadByte(void)
{
if(HAL_SPI_TransmitReceive(&hspi1,&d_send,&d_read,1,0xFFFFFF)!=HAL_OK)
d_read=0xff;
return d_read;
}
// 函数功能: 往串行Flash读取写入一个字节数据并接收一个字节数据
uint8_t SPI_FLASH_SendByte(uint8_t byte)
{
if(HAL_SPI_TransmitReceive(&hspi1,&byte,&d_read,1,0xFFFFFF)!=HAL_OK)
return 1;
return 0;
}
//读取Flash ID
uint32_t SPI_FLASH_ReadID(void)
{
uint32_t Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;
/* 选择串行FLASH: CS低电平 */
FLASH_L
/* 发送命令：读取芯片型号ID */
SPI_FLASH_SendByte(0x9F);
Temp0 = SPI_FLASH_ReadByte();
Temp1 = SPI_FLASH_ReadByte();
Temp2 = SPI_FLASH_ReadByte();
/* 禁用串行Flash：CS高电平 */
FLASH_H
Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;
return Temp;
}
//从Flash读取数据
void SPI_FLASH_BufferRead(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
{
FLASH_L
SPI_FLASH_SendByte(0x03);
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
SPI_FLASH_SendByte((ReadAddr & 0xFF00) >> 8);
SPI_FLASH_SendByte(ReadAddr & 0xFF);
while (NumByteToRead--) /* 读取数据 */
{
*pBuffer = SPI_FLASH_ReadByte();
pBuffer++;
}
FLASH_H
}
void SPI_FLASH_PageWrite(uint8_t* pBuffer,uint32_t addr,uint16_t NumByteToRead)
{
uint16_t i;
SPI_FLASH_WriteEnable(); //SET WEL
FLASH_L
SPI_FLASH_SendByte(0x02);
SPI_FLASH_SendByte((uint8_t)((addr)>>16)); //发送24bit地址
SPI_FLASH_SendByte((uint8_t)((addr)>>8));
SPI_FLASH_SendByte((uint8_t)addr);
for(i=0;i
{
SPI_FLASH_SendByte(pBuffer[i]);//循环写数
}
FLASH_H //取消片选
SPI_FLASH_WaitForWriteEnd(); //等待写入结束
}
//FLASH写函数
void SPI_FLASH_BufferWrite(uint8_t* pBuffer,uint32_t WriteAddr,uint32_t NumByteToWrite)
{
uint32_t 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)
{
SPI_FLASH_PageWrite(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
}
}
}
/* 函数功能: 擦除扇区 */
void SPI_FLASH_SectorErase(uint32_t SectorAddr)
{
SPI_FLASH_WriteEnable();
SPI_FLASH_WaitForWriteEnd();
FLASH_L
SPI_FLASH_SendByte(0x20);
SPI_FLASH_SendByte((SectorAddr & 0xFF0000) >> 16);
SPI_FLASH_SendByte((SectorAddr & 0xFF00) >> 8);
SPI_FLASH_SendByte(SectorAddr & 0xFF);
FLASH_H
SPI_FLASH_WaitForWriteEnd();
}
/* 函数功能: 擦除整个芯片 */
void SPI_FLASH_BulkErase(void)
{
SPI_FLASH_WriteEnable();
FLASH_L
SPI_FLASH_SendByte(0xC7);
FLASH_H
SPI_FLASH_WaitForWriteEnd();
}
//写使能
void SPI_FLASH_WriteEnable(void)
{
FLASH_L
SPI_FLASH_SendByte(0x06);
FLASH_H
}
//等待写入完毕
void SPI_FLASH_WaitForWriteEnd(void)
{
uint8_t FLASH_Status = 0;
FLASH_L
SPI_FLASH_SendByte(0x05);
do
{
FLASH_Status = SPI_FLASH_ReadByte();
}
while ((FLASH_Status & 0x01) == SET);
FLASH_H
}
/**
* 函数功能: 进入掉电模式
* 输入参数: 无
* 返 回 值: 无
* 说 明：无
*/
void SPI_Flash_PowerDown(void)
{
FLASH_L
SPI_FLASH_SendByte(0xB9);
FLASH_H
}
/**
* 函数功能: 唤醒串行Flash
* 输入参数: 无
* 返 回 值: 无
* 说 明：无
*/
void SPI_Flash_WAKEUP(void)
{
FLASH_L
SPI_FLASH_SendByte(0xAB);
FLASH_H
}
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
SPI.H：
/**
******************************************************************************
* File Name : SPI.h
* Description : This file provides code for the configuration
* of the SPI instances.
******************************************************************************
* This notice applies to any and all portions of this file
* that are not between comment pairs USER CODE BEGIN and
* USER CODE END. Other portions of this file, whether
* inserted by the user or by software development tools
* are owned by their respective copyright owners.
*
* Copyright (c) 2018 STMicroelectronics International N.V.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __spi_H
#define __spi_H
#ifdef __cplusplus
extern "C" {
#endif
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
#include "main.h"
#define FLASH_ID 0xEF4015
#define FLASH_L GPIOB->BSRR = GPIO_PIN_0<<16U;
#define FLASH_H GPIOB->BSRR = GPIO_PIN_0;
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
extern SPI_HandleTypeDef hspi1;
/* USER CODE BEGIN Private defines */
/* USER CODE END Private defines */
extern void _Error_Handler(char *, int);
void MX_SPI1_Init(void);
/* USER CODE BEGIN Prototypes */
/* USER CODE END Prototypes */
#ifdef __cplusplus
}
#endif
#endif /*__ spi_H */
/***************FLASH API******************/
uint32_t SPI_FLASH_ReadID(void);
void SPI_FLASH_BufferWrite(uint8_t* pBuffer,uint32_t WriteAddr,uint32_t NumByteToWrite);
void SPI_FLASH_BufferRead(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead);
void SPI_FLASH_PageWrite(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
void SPI_FLASH_SectorErase(uint32_t SectorAddr);
void SPI_FLASH_BulkErase(void);
void SPI_FLASH_WriteEnable(void);
void SPI_FLASH_WaitForWriteEnd(void);
void SPI_Flash_PowerDown(void);
void SPI_Flash_WAKEUP(void);
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
SPI代码，大部分用的是硬石的。我自己也有写，但就是想试试别人的代码。当然他代码也存在一些问题，他没有将
uint8_t SPI_FLASH_ReadByte(void);
uint8_t SPI_FLASH_SendByte(uint8_t byte);
的功能区分开，导致这两个函数实现一样的功能（SPI寄存器数据回环），我修改了一下，使它们读写功能分开，
而且更精简一些。
void SPI_FLASH_BufferWrite(uint8_t* pBuffer,uint32_t WriteAddr,uint32_t NumByteToWrite);
这个函数的是原子的，因为硬石写得太啰嗦 - . -
修改完SPI以及"usbd_storage_if.c"，编译过后烧写进芯片。
烧写完后需要重新插拔USB，然后就会弹出新的U盘，你U盘中没有文件系统的话，会要求你格式化的。结果如图：
我的FLASH是W25Q16，所以显示2MB容量。
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