1.第一次写博客，如有错误，请及时指正，如有表达不通顺的地方，敬请谅解。
2.本篇文章主要描述如何使用STM32cube配置USB，使用的主控为STM32F072，Flash为W25Q32，使用的主控RAM只有16K，所以不使用太多外设，也没有使用文件系统。
3.此段说明制作U盘的目的，不感兴趣可以忽略。由于主控ROM只有128K（项目需要，不可更换），需要将图片、字库等内容存储在W25Q32中，仅有一个串口，还被WiFi模块占用。因此上网查询资料，查询到了很多关于U盘制作的资料。有的使用原子的编程方式（看不懂）；有的使用标准库（我需要使用的是HAL库）；有的是STMF1+文件系统+Flash（F1不合适，并且整个工程太大，16KRAM不够用）。综上，选择自己造轮子，别人家法拉利的轮子太奢华，不能装在自家的拖拉机上。不管别人家的轮子多么好看，不适合自己就是不适合自己。但是很感谢这些造轮子的人，让我有了造拖拉机轮子的思路，文末将会贴上他们文章的链接，多看多写多想。
打开cube软件，芯片选择STM32F072CBT6。
使用内部8M晶振，所以不进行配置RCC。不进行调试，USART也不配置
配置USB
配置USB_DEVICE
时钟树设置
生成文件
没有进行spi配置，毕竟还要加入flash扇区擦除、缓冲区写入等函数。spi控制程序选择野火的，在此感谢野火。
野火的程序都可以在淘宝下载，还有很多资料，有很大的参考价值。
STORAGE_BLK_SIZ 扇区大小为4096
STORAGE_BLK_NBR 总共有1024个扇区
每次写入数据前，需将对应的扇区进行擦除
main.c
int main(void)
{
SystemClock_Config();
MX_GPIO_Init(); //usb引脚使用了PA口
FLASH_GPIO_Init();
SPI_FLASH_Init();
MX_USB_DEVICE_Init();
while(1)
{
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSI48;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
stm32f0xx_it.h
/* External variables --------------------------------------------------------*/
extern PCD_HandleTypeDef hpcd_USB_FS;
/**
* @brief This function handles USB global interrupt / USB wake-up interrupt through EXTI line 18.
*/
void USB_IRQHandler(void)
{
/* USER CODE BEGIN USB_IRQn 0 */
/* USER CODE END USB_IRQn 0 */
HAL_PCD_IRQHandler(&hpcd_USB_FS);
/* USER CODE BEGIN USB_IRQn 1 */
/* USER CODE END USB_IRQn 1 */
}
/* Includes ------------------------------------------------------------------*/
#include "usbd_storage_if.h"
#include "bsp_spi_flash.h"
//#define STORAGE_LUN_NBR 1
//#define STORAGE_BLK_NBR 0x10000
//#define STORAGE_BLK_SIZ 0x2000
#define STORAGE_LUN_NBR 1
#define STORAGE_BLK_NBR 1024
#define STORAGE_BLK_SIZ 4096
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 */
};
extern USBD_HandleTypeDef hUsbDeviceFS;
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);
/**
* @}
*/
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)
{
/* USER CODE BEGIN 4 */
// if(SPI_FLASH_ReadID() == sFLASH_ID)
return (USBD_OK);
// else
// return -1;
/* USER CODE END 4 */
}
/**
* @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)
{
/* USER CODE BEGIN 6 */
SPI_FLASH_BufferRead(buf, blk_addr*STORAGE_BLK_SIZ, blk_len*STORAGE_BLK_SIZ);
return (USBD_OK);
/* USER CODE END 6 */
}
/**
* @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)
{
/* USER CODE BEGIN 7 */
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);
/* USER CODE END 7 */
}
/**
* @brief .
* @param None
* @retval .
*/
int8_t STORAGE_GetMaxLun_FS(void)
{
/* USER CODE BEGIN 8 */
return (STORAGE_LUN_NBR - 1);
/* USER CODE END 8 */
}
缩减篇幅，删除了一些cube生成的无关注释
spi.c
#include "bsp_spi_flash.h"
SPI_HandleTypeDef SpiHandle;
static __IO uint32_t SPITimeout = SPIT_LONG_TIMEOUT;
static uint16_t SPI_TIMEOUT_UserCallback(uint8_t errorCode);
/**
* @brief SPI MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* - Peripheral's GPIO Configuration
* @param hspi: SPI handle pointer
* @retval None
*/
void FLASH_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
/*##-1- Enable peripherals and GPIO Clocks #################################*/
/* Enable GPIO TX/RX clock */
SPIx_SCK_GPIO_CLK_ENABLE();
SPIx_MISO_GPIO_CLK_ENABLE();
SPIx_MOSI_GPIO_CLK_ENABLE();
SPIx_CS_GPIO_CLK_ENABLE();
/* Enable SPI clock */
SPIx_CLK_ENABLE();
/*##-2- Configure peripheral GPIO ##########################################*/
/* SPI SCK GPIO pin configuration */
GPIO_InitStruct.Pin = SPIx_SCK_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStruct);
/* SPI MISO GPIO pin configuration */
GPIO_InitStruct.Pin = SPIx_MISO_PIN;
HAL_GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStruct);
/* SPI MOSI GPIO pin configuration */
GPIO_InitStruct.Pin = SPIx_MOSI_PIN;
HAL_GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStruct);
GPIO_InitStruct.Pin = FLASH_CS_PIN ;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
HAL_GPIO_Init(FLASH_CS_GPIO_PORT, &GPIO_InitStruct);
SPI_FLASH_CS_HIGH();
}
void SPI_FLASH_Init(void)
{
SpiHandle.Instance = SPIx;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
SpiHandle.Init.CLKPhase = SPI_PHASE_2EDGE;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_HIGH;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
SpiHandle.Init.Mode = SPI_MODE_MASTER;
HAL_SPI_Init(&SpiHandle);
__HAL_SPI_ENABLE(&SpiHandle);
}
/**
* @brief 擦除FLASH扇区
* @param SectorAddr：要擦除的扇区地址
* @retval 无
*/
void SPI_FLASH_SectorErase(uint32_t SectorAddr)
{
/* 发送FLASH写使能命令 */
SPI_FLASH_WriteEnable();
SPI_FLASH_WaitForWriteEnd();
/* 擦除扇区 */
/* 选择FLASH: CS低电平 */
SPI_FLASH_CS_LOW();
/* 发送扇区擦除指令*/
SPI_FLASH_SendByte(W25X_SectorErase);
/*发送擦除扇区地址的高位*/
SPI_FLASH_SendByte((SectorAddr & 0xFF0000) >> 16);
/* 发送擦除扇区地址的中位 */
SPI_FLASH_SendByte((SectorAddr & 0xFF00) >> 8);
/* 发送擦除扇区地址的低位 */
SPI_FLASH_SendByte(SectorAddr & 0xFF);
/* 停止信号 FLASH: CS 高电平 */
SPI_FLASH_CS_HIGH();
/* 等待擦除完毕*/
SPI_FLASH_WaitForWriteEnd();
}
/**
* @brief 擦除FLASH扇区，整片擦除
* @brief 页为编程单位，可以一次性编程1个到256个字节
* @brief 超过256个字节要分次写入
* @brief 写入数据之前，必须对对应的区域进行擦除操作
* @brief 擦除的最小单位是“扇区”
* @param 无
* @retval 无
*/
void SPI_FLASH_BulkErase(void)
{
/* 发送FLASH写使能命令 */
SPI_FLASH_WriteEnable();
/* 整块 Erase */
/* 选择FLASH: CS低电平 */
SPI_FLASH_CS_LOW();
/* 发送整块擦除指令*/
SPI_FLASH_SendByte(W25X_ChipErase);
/* 停止信号 FLASH: CS 高电平 */
SPI_FLASH_CS_HIGH();
/* 等待擦除完毕*/
SPI_FLASH_WaitForWriteEnd();
}
/**
* @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(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
{
/* 发送FLASH写使能命令 */
SPI_FLASH_WriteEnable();
/* 选择FLASH: CS低电平 */
SPI_FLASH_CS_LOW();
/* 写页写指令*/
SPI_FLASH_SendByte(W25X_PageProgram);
/*发送写地址的高位*/
SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
/*发送写地址的中位*/
SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);
/*发送写地址的低位*/
SPI_FLASH_SendByte(WriteAddr & 0xFF);
if(NumByteToWrite > SPI_FLASH_PerWritePageSize)
{
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 */
SPI_FLASH_SendByte(*pBuffer);
/* 指向下一字节数据 */
pBuffer++;
}
/* 停止信号 FLASH: CS 高电平 */
SPI_FLASH_CS_HIGH();
/* 等待写入完毕*/
SPI_FLASH_WaitForWriteEnd();
}
/**
* @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(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
{
uint8_t 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，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;
SPI_FLASH_PageWrite(pBuffer, WriteAddr, count);
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);
}
}
}
}
/**
* @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(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
{
/* 选择FLASH: CS低电平 */
SPI_FLASH_CS_LOW();
/* 发送 读 指令 */
SPI_FLASH_SendByte(W25X_ReadData);
/* 发送 读 地址高位 */
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
/* 发送 读 地址中位 */
SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
/* 发送 读 地址低位 */
SPI_FLASH_SendByte(ReadAddr & 0xFF);
/* 读取数据 */
while (NumByteToRead--)
{
*pBuffer = SPI_FLASH_ReadByte();
/* 指向下一个字节缓冲区 */
pBuffer++;
}
/* 停止信号 FLASH: CS 高电平 */
SPI_FLASH_CS_HIGH();
}
/**
* @brief 读取FLASH ID
* @param 无
* @retval FLASH ID
*/
uint32_t SPI_FLASH_ReadID(void)
{
uint32_t Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;
/* 开始通讯：CS低电平 */
SPI_FLASH_CS_LOW();
/* 发送JEDEC指令，读取ID */
SPI_FLASH_SendByte(W25X_JedecDeviceID);
/* 读取一个字节数据 */
Temp0 = SPI_FLASH_ReadByte();
/* 读取一个字节数据 */
Temp1 = SPI_FLASH_ReadByte();
/* 读取一个字节数据 */
Temp2 = SPI_FLASH_ReadByte();
/* 停止通讯：CS高电平 */
SPI_FLASH_CS_HIGH();
/*把数据组合起来，作为函数的返回值*/
Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;
return Temp;
}
/**
* @brief 读取FLASH Device ID
* @param 无
* @retval FLASH Device ID
*/
uint32_t SPI_FLASH_ReadDeviceID(void)
{
uint32_t Temp = 0;
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "RDID " instruction */
SPI_FLASH_SendByte(W25X_DeviceID);
SPI_FLASH_SendByte(Dummy_Byte);
SPI_FLASH_SendByte(Dummy_Byte);
SPI_FLASH_SendByte(Dummy_Byte);
/* Read a byte from the FLASH */
Temp = SPI_FLASH_ReadByte();
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
return Temp;
}
/*******************************************************************************
* Function Name : SPI_FLASH_StartReadSequence
* Description : Initiates a read data byte (READ) sequence from the Flash.
* This is done by driving the /CS line low to select the device,
* then the READ instruction is transmitted followed by 3 bytes
* address. This function exit and keep the /CS line low, so the
* Flash still being selected. With this technique the whole
* content of the Flash is read with a single READ instruction.
* Input : - ReadAddr : FLASH's internal address to read from.
* Output : None
* Return : None
*******************************************************************************/
void SPI_FLASH_StartReadSequence(uint32_t ReadAddr)
{
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "Read from Memory " instruction */
SPI_FLASH_SendByte(W25X_ReadData);
/* Send the 24-bit address of the address to read from -----------------------*/
/* Send ReadAddr high nibble address byte */
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
/* Send ReadAddr medium nibble address byte */
SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
/* Send ReadAddr low nibble address byte */
SPI_FLASH_SendByte(ReadAddr & 0xFF);
}
/**
* @brief 使用SPI读取一个字节的数据
* @param 无
* @retval 返回接收到的数据
*/
uint8_t SPI_FLASH_ReadByte(void)
{
uint8_t data = 0xFF;
// SPITimeout = SPIT_FLAG_TIMEOUT;
// /* 等待接收缓冲区非空，RXNE事件 */
// while (__HAL_SPI_GET_FLAG( &SpiHandle, SPI_FLAG_RXNE ) == RESET)
// {
// if((SPITimeout--) == 0) return SPI_TIMEOUT_UserCallback(1);
// }
/* 读取数据寄存器，获取接收缓冲区数据 */
HAL_SPI_Receive(&SpiHandle,&data,1,0xFFFF);
return data;
}
/**
* @brief 使用SPI发送一个字节的数据
* @param byte：要发送的数据
* @retval 返回接收到的数据
*/
uint8_t SPI_FLASH_SendByte(uint8_t byte)
{
// SPITimeout = SPIT_FLAG_TIMEOUT;
// /* 等待发送缓冲区为空，TXE事件 */
// while (__HAL_SPI_GET_FLAG( &SpiHandle, SPI_FLAG_TXE ) == RESET)
// {
// if((SPITimeout--) == 0) return SPI_TIMEOUT_UserCallback(0);
// }
/* 写入数据寄存器，把要写入的数据写入发送缓冲区 */
HAL_SPI_Transmit(&SpiHandle,&byte,1,0xFFFF);
return NULL;
}
/*******************************************************************************
* Function Name : SPI_FLASH_SendHalfWord
* Description : Sends a Half Word through the SPI interface and return the
* Half Word received from the SPI bus.
* Input : Half Word : Half Word to send.
* Output : None
* Return : The value of the received Half Word.
*******************************************************************************/
//uint16_t SPI_FLASH_SendHalfWord(uint16_t HalfWord)
//{
//
// SPITimeout = SPIT_FLAG_TIMEOUT;
// /* Loop while DR register in not emplty */
// while (__HAL_SPI_GET_FLAG( &SpiHandle, SPI_FLAG_TXE ) == RESET)
// {
// if((SPITimeout--) == 0) return SPI_TIMEOUT_UserCallback(2);
// }
// /* Send Half Word through the SPIx peripheral */
// WRITE_REG(SpiHandle.Instance->DR, HalfWord);
// SPITimeout = SPIT_FLAG_TIMEOUT;
// /* Wait to receive a Half Word */
// while (__HAL_SPI_GET_FLAG( &SpiHandle, SPI_FLAG_RXNE ) == RESET)
// {
// if((SPITimeout--) == 0) return SPI_TIMEOUT_UserCallback(3);
// }
// /* Return the Half Word read from the SPI bus */
// return READ_REG(SpiHandle.Instance->DR);
//}
/**
* @brief 向FLASH发送 写使能 命令
* @param none
* @retval none
*/
void SPI_FLASH_WriteEnable(void)
{
/* 通讯开始：CS低 */
SPI_FLASH_CS_LOW();
/* 发送写使能命令*/
SPI_FLASH_SendByte(W25X_WriteEnable);
/*通讯结束：CS高 */
SPI_FLASH_CS_HIGH();
}
/**
* @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)
{
uint8_t FLASH_Status = 0;
/* 选择 FLASH: CS 低 */
SPI_FLASH_CS_LOW();
/* 发送 读状态寄存器 命令 */
SPI_FLASH_SendByte(W25X_ReadStatusReg);
SPITimeout = SPIT_FLAG_TIMEOUT;
/* 若FLASH忙碌，则等待 */
do
{
/* 读取FLASH芯片的状态寄存器 */
FLASH_Status = SPI_FLASH_ReadByte();
{
if((SPITimeout--) == 0)
{
SPI_TIMEOUT_UserCallback(4);
return;
}
}
}
while ((FLASH_Status & WIP_Flag) == SET); /* 正在写入标志 */
/* 停止信号 FLASH: CS 高 */
SPI_FLASH_CS_HIGH();
}
//进入掉电模式
void SPI_Flash_PowerDown(void)
{
/* 选择 FLASH: CS 低 */
SPI_FLASH_CS_LOW();
/* 发送 掉电 命令 */
SPI_FLASH_SendByte(W25X_PowerDown);
/* 停止信号 FLASH: CS 高 */
SPI_FLASH_CS_HIGH();
}
//唤醒
void SPI_Flash_WAKEUP(void)
{
/*选择 FLASH: CS 低 */
SPI_FLASH_CS_LOW();
/* 发上 上电 命令 */
SPI_FLASH_SendByte(W25X_ReleasePowerDown);
/* 停止信号 FLASH: CS 高 */
SPI_FLASH_CS_HIGH(); //等待TRES1
}
/**
* @brief 等待超时回调函数
* @param None.
* @retval None.
*/
static uint16_t SPI_TIMEOUT_UserCallback(uint8_t errorCode)
{
/* 等待超时后的处理,输出错误信息 */
// FLASH_ERROR("SPI 等待超时!errorCode = %d",errorCode);
return 0;
}
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
spi.h
#ifndef __SPI_FLASH_H
#define __SPI_FLASH_H
#include "stm32f0xx.h"
#include "main.h"
#include <stdio.h>
/* Private typedef -----------------------------------------------------------*/
//#define sFLASH_ID 0xEF3015 //W25X16
//#define sFLASH_ID 0xEF4015 //W25Q16
#define sFLASH_ID 0XEF4016 //W25Q32
//#define sFLASH_ID 0XEF4017 //W25Q64
//#define sFLASH_ID 0XEF4018 //W25Q128
//#define SPI_FLASH_PageSize 4096
#define SPI_FLASH_PageSize 256
#define SPI_FLASH_PerWritePageSize 256
/* Private define ------------------------------------------------------------*/
/*命令定义-开头*******************************/
#define W25X_WriteEnable 0x06
#define W25X_WriteDisable 0x04
#define W25X_ReadStatusReg 0x05
#define W25X_WriteStatusReg 0x01
#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 WIP_Flag 0x01 /* Write In Progress (WIP) flag */
#define Dummy_Byte 0xFF
/*命令定义-结尾*******************************/
#define SPIx SPI2
#define SPIx_CLK_ENABLE() __HAL_RCC_SPI2_CLK_ENABLE()
#define SPIx_SCK_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define SPIx_MISO_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define SPIx_MOSI_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define SPIx_CS_GPIO_CLK_ENABLE() __HAL_RCC_GPIOA_CLK_ENABLE()
#define SPIx_FORCE_RESET() __HAL_RCC_SPI2_FORCE_RESET()
#define SPIx_RELEASE_RESET() __HAL_RCC_SPI2_RELEASE_RESET()
/* Definition for SPIx Pins */
#define SPIx_SCK_PIN GPIO_PIN_13
#define SPIx_SCK_GPIO_PORT GPIOB
#define SPIx_MISO_PIN GPIO_PIN_14
#define SPIx_MISO_GPIO_PORT GPIOB
#define SPIx_MOSI_PIN GPIO_PIN_15
#define SPIx_MOSI_GPIO_PORT GPIOB
#define FLASH_CS_PIN GPIO_PIN_12
#define FLASH_CS_GPIO_PORT GPIOB
#define digitalHi(p,i) {p->BSRR=i;} //设置为高电平
#define digitalLo(p,i) {p->BSRR=(uint32_t)i << 16;} //输出低电平
#define SPI_FLASH_CS_LOW() digitalLo(FLASH_CS_GPIO_PORT,FLASH_CS_PIN )
#define SPI_FLASH_CS_HIGH() digitalHi(FLASH_CS_GPIO_PORT,FLASH_CS_PIN )
/*SPI接口定义-结尾****************************/
/*等待超时时间*/
#define SPIT_FLAG_TIMEOUT ((uint32_t)0x1000)
#define SPIT_LONG_TIMEOUT ((uint32_t)(10 * SPIT_FLAG_TIMEOUT))
/*信息输出*/
#define FLASH_DEBUG_ON 1
//#define FLASH_INFO(fmt,arg...) printf("<<-FLASH-INFO->> "fmt"\n",##arg)
//#define FLASH_ERROR(fmt,arg...) printf("<<-FLASH-ERROR->> "fmt"\n",##arg)
//#define FLASH_DEBUG(fmt,arg...) do{\
// if(FLASH_DEBUG_ON)\
// printf("<<-FLASH-DEBUG->> [%d]"fmt"\n",__LINE__, ##arg);\
// }while(0)
void FLASH_GPIO_Init(void);
void SPI_FLASH_Init(void);
void SPI_FLASH_SectorErase(uint32_t SectorAddr);
void SPI_FLASH_BulkErase(void);
void SPI_FLASH_PageWrite(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
void SPI_FLASH_BufferWrite(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite);
void SPI_FLASH_BufferRead(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead);
uint32_t SPI_FLASH_ReadID(void);
uint32_t SPI_FLASH_ReadDeviceID(void);
void SPI_FLASH_StartReadSequence(uint32_t ReadAddr);
void SPI_Flash_PowerDown(void);
void SPI_Flash_WAKEUP(void);
uint8_t SPI_FLASH_ReadByte(void);
uint8_t SPI_FLASH_SendByte(uint8_t byte);
uint16_t SPI_FLASH_SendHalfWord(uint16_t HalfWord);
void SPI_FLASH_WriteEnable(void);
void SPI_FLASH_WaitForWriteEnd(void);
uint32_t HAL_W25QXX_ReadID(void);
#endif /* __SPI_FLASH_H */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
很多文章介绍的是需要修改堆栈大小
我也进行了修改，因为cube配置的工程比较难移植到其他程序中。当我测试完毕后，就将usb所需要的文件进行整理，移植到自己建立的工程当中。此时忘记修改堆栈大小，而U盘还能进行读取，未出现错误，这些问题还将继续探索。
据其他博主介绍，没有文件系统，需先将U盘格式化，当时电脑的确提示格式化U盘。
W25Q32只有4MBYTE、32Mbit大小。
经测试，断电可保存数据
链接: https://blog.csdn.net/a3748622/article/details/80347730.
链接: http://news.eeworld.com.cn/mcu/2018/ic-news070140139.html.
其实还有很多优质文章的，一下子找不着了，之后看下能不能补上。
后续也将多写博客，记录自己的学习过程、疑问。
有些屌丝总是嫉妒我
