使用STLINK读写外挂FLASH

moke1230

已于 2025-02-11 14:22:23 修改

阅读量1.1k

点赞数 23

文章标签：单片机嵌入式硬件

于 2023-12-18 08:38:16 首次发布

本文链接：https://blog.youkuaiyun.com/fkxmy/article/details/135054067

版权

MCU及GPIO配置

MCU型号：STM32F030C8T6

FLASH芯片：25Q32

GPIO配置：PA15---CS

PB3 ---SCLK

PB4---MOSI

PB5---MISO

SPI初始化

void SPI1_Init(void)
{
   SPI_InitTypeDef   SPI_InitStructure;
   GPIO_InitTypeDef GPIO_InitStructure;

   /* 使能GPIO时钟 */
   RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB, ENABLE);
   RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1, ENABLE);

   /* 配置GPIO管脚复用*/
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
   GPIO_Init(GPIOB, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin =GPIO_Pin_15 ;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT ; //推挽输出
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
   GPIO_Init(GPIOA, &GPIO_InitStructure);

   GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_0);
   GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_0);
   GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_0);

   /* Deselect the FLASH: Chip Select high */
   sFLASH_CS_HIGH();

   /* SPI1 configuration */
   SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
   SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
   SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
   SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
   SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
   SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
   SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
   SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
   SPI_InitStructure.SPI_CRCPolynomial = 7;
   SPI_Init(SPI1, &SPI_InitStructure);

   SPI_I2S_DMACmd(SPI1,SPI_I2S_DMAReq_Rx | SPI_I2S_DMAReq_Tx,ENABLE);
   /* Enable SPI2 Rx buffer DMA transfer request */
   //   SPI_DMACmd(SPI1, SPI_DMAReq_Rx | SPI_DMAReq_Tx, ENABLE);
   SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF);

   /* Enable SPI1   */
   SPI_Cmd(SPI1, ENABLE);
}

读FLASH

/**
* @brief Reads a block of data from the FLASH.
* @param pBuffer: pointer to the buffer that receives the data read from the FLASH.
* @param ReadAddr: FLASH's internal address to read from.
* @param NumByteToRead: number of bytes to read from the FLASH.
* @retval None
*/
void sFLASH_ReadBuffer(uint8_t* pBuffer, uint32_t ReadAddr, uint32_t NumByteToRead)
{
/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();

/*!< Send "Read from Memory " instruction */
sFLASH_SendByte(sFLASH_CMD_READ);

/*!< Send ReadAddr high nibble address byte to read from */
sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
/*!< Send ReadAddr medium nibble address byte to read from */
sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);
/*!< Send ReadAddr low nibble address byte to read from */
sFLASH_SendByte(ReadAddr & 0xFF);

while (NumByteToRead--) /*!< while there is data to be read */
{
/*!< Read a byte from the FLASH */
*pBuffer = sFLASH_SendByte(sFLASH_DUMMY_BYTE);
/*!< Point to the next location where the byte read will be saved */
pBuffer++;
}

/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();
}

/**
* @brief Reads FLASH identification.
* @param None
* @retval FLASH identification
*/
uint32_t sFLASH_ReadID(void)
{
uint32_t Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;

/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();

/*!< Send "RDID " instruction */
sFLASH_SendByte(0x9F);

/*!< Read a byte from the FLASH */
Temp0 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

/*!< Read a byte from the FLASH */
Temp1 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

/*!< Read a byte from the FLASH */
Temp2 = sFLASH_SendByte(sFLASH_DUMMY_BYTE);

/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();

Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;

return Temp;
}

/**
* @brief 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.
* @param ReadAddr: FLASH's internal address to read from.
* @retval None
*/
void sFLASH_StartReadSequence(uint32_t ReadAddr)
{
/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();

/*!< Send "Read from Memory " instruction */
sFLASH_SendByte(sFLASH_CMD_READ);

/*!< Send the 24-bit address of the address to read from -------------------*/
/*!< Send ReadAddr high nibble address byte */
sFLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
/*!< Send ReadAddr medium nibble address byte */
sFLASH_SendByte((ReadAddr& 0xFF00) >> 8);
/*!< Send ReadAddr low nibble address byte */
sFLASH_SendByte(ReadAddr & 0xFF);
}

写FLASH

/**
* @brief Writes more than one byte to the FLASH with a single WRITE cycle
* (Page WRITE sequence).
* @note The number of byte can't exceed the FLASH page size.
* @param pBuffer: pointer to the buffer containing the data to be written
* to the FLASH.
* @param WriteAddr: FLASH's internal address to write to.
* @param NumByteToWrite: number of bytes to write to the FLASH, must be equal
* or less than "sFLASH_PAGESIZE" value.
* @retval None
*/
void sFLASH_WritePage(uint8_t* pBuffer, uint32_t WriteAddr, uint32_t NumByteToWrite)
{
/*!< Enable the write access to the FLASH */
sFLASH_WriteEnable();

/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();
/*!< Send "Write to Memory " instruction */
sFLASH_SendByte(sFLASH_CMD_WRITE);
/*!< Send WriteAddr high nibble address byte to write to */
sFLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
/*!< Send WriteAddr medium nibble address byte to write to */
sFLASH_SendByte((WriteAddr & 0xFF00) >> 8);
/*!< Send WriteAddr low nibble address byte to write to */
sFLASH_SendByte(WriteAddr & 0xFF);

/*!< while there is data to be written on the FLASH */
while (NumByteToWrite--)
{
/*!< Send the current byte */
sFLASH_SendByte(*pBuffer);
/*!< Point on the next byte to be written */
pBuffer++;
}

/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();

/*!< Wait the end of Flash writing */
sFLASH_WaitForWriteEnd();
}

/**
* @brief Writes block of data to the FLASH. In this function, the number of
* WRITE cycles are reduced, using Page WRITE sequence.
* @param pBuffer: pointer to the buffer containing the data to be written
* to the FLASH.
* @param WriteAddr: FLASH's internal address to write to.
* @param NumByteToWrite: number of bytes to write to the FLASH.
* @retval None
*/
void sFLASH_WriteBuffer(uint8_t* pBuffer, uint32_t WriteAddr, uint32_t NumByteToWrite)
{
uint32_t NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;

Addr = WriteAddr % 256;
count = 256 - Addr;
NumOfPage = NumByteToWrite / 256;
NumOfSingle = NumByteToWrite % 256;

if (Addr == 0) /*!< WriteAddr is sFLASH_PAGESIZE aligned */
{
if (NumOfPage == 0) /*!< NumByteToWrite < sFLASH_PAGESIZE */
{
sFLASH_WritePage(pBuffer, WriteAddr, NumByteToWrite);
}
else /*!< NumByteToWrite > sFLASH_PAGESIZE */
{
while (NumOfPage--)
{
sFLASH_WritePage(pBuffer, WriteAddr, 256);
WriteAddr += 256;
pBuffer += 256;
}

sFLASH_WritePage(pBuffer, WriteAddr, NumOfSingle);
}
}
else /*!< WriteAddr is not sFLASH_PAGESIZE aligned */
{
if (NumOfPage == 0) /*!< NumByteToWrite < sFLASH_PAGESIZE */
{
if (NumOfSingle > count) /*!< (NumByteToWrite + WriteAddr) > sFLASH_PAGESIZE */
{
temp = NumOfSingle - count;

sFLASH_WritePage(pBuffer, WriteAddr, count);
WriteAddr += count;
pBuffer += count;

sFLASH_WritePage(pBuffer, WriteAddr, temp);
}
else
{
sFLASH_WritePage(pBuffer, WriteAddr, NumByteToWrite);
}
}
else /*!< NumByteToWrite > sFLASH_PAGESIZE */
{
NumByteToWrite -= count;
NumOfPage = NumByteToWrite / 256;
NumOfSingle = NumByteToWrite % 256;

sFLASH_WritePage(pBuffer, WriteAddr, count);
WriteAddr += count;
pBuffer += count;

while (NumOfPage--)
{
sFLASH_WritePage(pBuffer, WriteAddr, 256);
WriteAddr += 256;
pBuffer += 256;
}

if (NumOfSingle != 0)
{
sFLASH_WritePage(pBuffer, WriteAddr, NumOfSingle);
}
}
}
}

FLASH擦除

/**
* @brief Erases the specified FLASH sector.
* @param SectorAddr: address of the sector to erase.
* @retval None
*/
void sFLASH_EraseSector(uint32_t SectorAddr)
{
/*!< Send write enable instruction */
sFLASH_WriteEnable();

/*!< Sector Erase */
/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();
/*!< Send Sector Erase instruction */
sFLASH_SendByte(sFLASH_CMD_SE);
/*!< Send SectorAddr high nibble address byte */
sFLASH_SendByte((SectorAddr & 0xFF0000) >> 16);
/*!< Send SectorAddr medium nibble address byte */
sFLASH_SendByte((SectorAddr & 0xFF00) >> 8);
/*!< Send SectorAddr low nibble address byte */
sFLASH_SendByte(SectorAddr & 0xFF);
/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();

/*!< Wait the end of Flash writing */
sFLASH_WaitForWriteEnd();
}

/**
* @brief Erases the entire FLASH.
* @param None
* @retval None
*/
void sFLASH_EraseBulk(void)
{
/*!< Send write enable instruction */
sFLASH_WriteEnable();

/*!< Bulk Erase */
/*!< Select the FLASH: Chip Select low */
sFLASH_CS_LOW();
/*!< Send Bulk Erase instruction */
sFLASH_SendByte(sFLASH_CMD_BE);
/*!< Deselect the FLASH: Chip Select high */
sFLASH_CS_HIGH();

/*!< Wait the end of Flash writing */
sFLASH_WaitForWriteE