正文
W25Q64指令集
SPI硬件相关宏定义，bsp_spi.h
#define Dummy_Byte 0xFF
#define W25X_WriteEnable 0x06
#define W25X_WriteDisable 0x04
#define W25X_ReadStatusReg1 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 FLASH_PAGE_SIZE 256
读取Flash ID
uint32_t BSP_Flash_ID(void)
{
uint32_t flash_id;
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_JedecDeviceID);
flash_id = BSP_SPI_ReceiveByte();
flash_id <<= 8;
flash_id |= BSP_SPI_ReceiveByte();
flash_id <<= 8;
flash_id |= BSP_SPI_ReceiveByte();
BSP_SPIx_NSS_Disable;
return flash_id;
}
读使能
void BSP_Flash_Write_Enable(void)
{
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_WriteEnable);
BSP_SPIx_NSS_Disable;
}
等待FLASH空闲状态
void BSP_Flash_WaitStandByState(void)
{
uint8_t Flash_Status = 0;
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_ReadStatusReg1);
do{
Flash_Status = BSP_SPI_ReceiveByte();
}while((Flash_Status & 0x01) == SET);
BSP_SPIx_NSS_Disable;
}
擦除扇区，需要注意Seator擦除操作需要输入地址对齐4KB
void BSP_Flash_EraseSector(uint32_t SectorAddr)
{
BSP_Flash_Write_Enable();
BSP_Flash_WaitStandByState();
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_SectorErase);
BSP_SPI_SendByte((SectorAddr & 0xff0000)>>16);
BSP_SPI_SendByte((SectorAddr & 0xff00)>>8);
BSP_SPI_SendByte(SectorAddr & 0xff);
BSP_SPIx_NSS_Disable;
BSP_Flash_WaitStandByState();
}
擦除块，需要注意Block擦除操作需要输入地址对齐64KB
void BSP_Flash_EraseBlock(uint32_t BlockAddr)
{
BSP_Flash_Write_Enable();
BSP_Flash_WaitStandByState();
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_BlockErase);
BSP_SPI_SendByte((BlockAddr & 0xff0000)>>16);
BSP_SPI_SendByte((BlockAddr & 0xff00)>>8);
BSP_SPI_SendByte(BlockAddr & 0xff);
BSP_SPIx_NSS_Disable;
BSP_Flash_WaitStandByState();
}
擦除芯片
void BSP_Flash_EraseChip(void)
{
BSP_Flash_Write_Enable();
BSP_Flash_WaitStandByState();
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_ChipErase);
BSP_SPIx_NSS_Disable;
BSP_Flash_WaitStandByState();
}
页写入，Page写入支持的最大字节为256Byte，需要考虑
void BSP_Flash_PageWrite(uint8_t *pBuffer,uint32_t WriteAddr,uint16_t NumBytetoWrite)
{
BSP_Flash_Write_Enable();
BSP_Flash_WaitStandByState();
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_PageProgram);
BSP_SPI_SendByte((WriteAddr & 0xff0000)>>16);
BSP_SPI_SendByte((WriteAddr & 0xff00)>>8);
BSP_SPI_SendByte(WriteAddr & 0xff);
if(NumBytetoWrite > FLASH_PAGE_SIZE)
{
NumBytetoWrite = FLASH_PAGE_SIZE;
DEBUG_INFO("FLASH Page Program OverSize\r\n");
}
while(NumBytetoWrite--)
{
BSP_SPI_SendByte(*pBuffer);
pBuffer++;
}
BSP_SPIx_NSS_Disable;
BSP_Flash_WaitStandByState();
}
不定长字节写入，没有页写入的最大字节256Byte限制
void BSP_Flash_BufferWrite(uint8_t *pBuffer,uint32_t WriteAddr,uint16_t NumBytetoWrite)
{
uint8_t NumofPage = 0,NumofSingle = 0,Addr = 0,Addr_Cnt = 0,Addr_Temp = 0;
Addr = WriteAddr % FLASH_PAGE_SIZE;
Addr_Cnt = FLASH_PAGE_SIZE - Addr;
NumofSingle = NumBytetoWrite % FLASH_PAGE_SIZE;
NumofPage = NumBytetoWrite / FLASH_PAGE_SIZE;
if(Addr == 0){
if(NumofPage == 0)
BSP_Flash_PageWrite(pBuffer,WriteAddr,NumofSingle);
else{
while(NumofPage--){
BSP_Flash_PageWrite(pBuffer,WriteAddr,FLASH_PAGE_SIZE);
WriteAddr += FLASH_PAGE_SIZE;
pBuffer += FLASH_PAGE_SIZE;
}
if(NumofSingle != 0)
BSP_Flash_PageWrite(pBuffer,WriteAddr,NumofSingle);
}
}
else{
if(NumofPage == 0){
if(NumofSingle > Addr_Cnt){
Addr_Temp = NumofSingle - Addr_Cnt;
BSP_Flash_PageWrite(pBuffer,WriteAddr,Addr_Cnt);
WriteAddr += Addr_Cnt;
pBuffer += Addr_Cnt;
BSP_Flash_PageWrite(pBuffer,WriteAddr,Addr_Temp);
}
else
BSP_Flash_PageWrite(pBuffer,WriteAddr,NumBytetoWrite);
}
else{
NumBytetoWrite -= Addr_Cnt;
NumofPage = NumBytetoWrite / EE_PAGE_SIZE;
NumofSingle = NumBytetoWrite % EE_PAGE_SIZE;
if(Addr_Cnt != 0){
BSP_Flash_PageWrite(pBuffer,WriteAddr,Addr_Cnt);
WriteAddr += Addr_Cnt;;
pBuffer += Addr_Cnt;
}
while(NumofPage--){
BSP_Flash_PageWrite(pBuffer,WriteAddr,Addr_Cnt);
WriteAddr += FLASH_PAGE_SIZE;
pBuffer += FLASH_PAGE_SIZE;
}
if(NumofSingle != 0)
BSP_Flash_PageWrite(pBuffer,WriteAddr,NumofSingle);
}
}
}
上述代码主要分为以下几种情况。
写入的数据的首地址页对齐。
数据长度没有超过一页的大小（256Byte），则直接写入。
数据长度超过一页的大小（256Byte），先按页写入，再将多余的写入新的一页。
写入的数据的首地址并不是页对齐。
数据长度没有超过一页的大小（256Byte）
数据首地址距离页尾的空间不足以放下整个数据，则先补全该页，再将剩余的数据写到下一页。
数据首地址距离页尾的空间足以放下整个数据，则直接写入。
数据长度超过一页的大小（256Byte）
先补全该页，再按页写入，再将剩余的数据写到下一页。
void BSP_Flash_BufferRead(uint8_t *pBuffer,uint32_t ReadAddr,uint16_t NumBytetoRead)
{
BSP_SPIx_NSS_Enable;
BSP_SPI_SendByte(W25X_ReadData);
BSP_SPI_SendByte((ReadAddr & 0xff0000)>>16);
BSP_SPI_SendByte((ReadAddr & 0xff00)>>8);
BSP_SPI_SendByte(ReadAddr & 0xff);
while(NumBytetoRead--)
{
*pBuffer = BSP_SPI_ReceiveByte();
pBuffer++;
}
BSP_SPIx_NSS_Disable;
}
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版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
原文链接：https://blog.csdn.net/ZipingPan/article/details/137365086
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