110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
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#include "stmflash.h"
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// 读取指定地址的半字(16位数据)
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// faddr:读地址
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// 返回值:对应数据.
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u32 STMFLASH_ReadWord(u32 faddr)
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{
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return *(vu32 *)faddr;
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}
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// 获取某个地址所在的flash扇区
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// addr:flash地址
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// 返回值:0~11,即addr所在的扇区
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uint16_t STMFLASH_GetFlashSector(u32 addr)
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{
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if (addr < ADDR_FLASH_SECTOR_1)
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return FLASH_Sector_0;
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else if (addr < ADDR_FLASH_SECTOR_2)
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return FLASH_Sector_1;
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else if (addr < ADDR_FLASH_SECTOR_3)
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return FLASH_Sector_2;
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else if (addr < ADDR_FLASH_SECTOR_4)
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return FLASH_Sector_3;
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else if (addr < ADDR_FLASH_SECTOR_5)
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return FLASH_Sector_4;
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else if (addr < ADDR_FLASH_SECTOR_6)
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return FLASH_Sector_5;
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else if (addr < ADDR_FLASH_SECTOR_7)
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return FLASH_Sector_6;
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else if (addr < ADDR_FLASH_SECTOR_8)
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return FLASH_Sector_7;
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else if (addr < ADDR_FLASH_SECTOR_9)
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return FLASH_Sector_8;
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else if (addr < ADDR_FLASH_SECTOR_10)
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return FLASH_Sector_9;
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else if (addr < ADDR_FLASH_SECTOR_11)
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return FLASH_Sector_10;
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return FLASH_Sector_11;
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}
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// 从指定地址开始写入指定长度的数据
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// 特别注意:因为STM32F4的扇区实在太大,没办法本地保存扇区数据,所以本函数
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// 写地址如果非0XFF,那么会先擦除整个扇区且不保存扇区数据.所以
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// 写非0XFF的地址,将导致整个扇区数据丢失.建议写之前确保扇区里
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// 没有重要数据,最好是整个扇区先擦除了,然后慢慢往后写.
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// 该函数对OTP区域也有效!可以用来写OTP区!
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// OTP区域地址范围:0X1FFF7800~0X1FFF7A0F
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// WriteAddr:起始地址(此地址必须为4的倍数!!)
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// pBuffer:数据指针
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// NumToWrite:字(32位)数(就是要写入的32位数据的个数.)
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void STMFLASH_Write(u32 WriteAddr, u32 *pBuffer, u32 NumToWrite)
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{
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FLASH_Status status = FLASH_COMPLETE;
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u32 addrx = 0;
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u32 endaddr = 0;
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if (WriteAddr < STM32_FLASH_BASE || WriteAddr % 4)
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return; // 非法地址
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drv_flash_Init(); // 解锁
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FLASH_DataCacheCmd(DISABLE); // FLASH擦除期间,必须禁止数据缓存
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addrx = WriteAddr; // 写入的起始地址
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endaddr = WriteAddr + NumToWrite * 4; // 写入的结束地址
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if (addrx < 0X1FFF0000) // 只有主存储区,才需要执行擦除操作!!
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{
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while (addrx < endaddr) // 扫清一切障碍.(对非FFFFFFFF的地方,先擦除)
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{
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if (STMFLASH_ReadWord(addrx) != 0XFFFFFFFF) // 有非0XFFFFFFFF的地方,要擦除这个扇区
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{
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status = FLASH_EraseSector(STMFLASH_GetFlashSector(addrx), VoltageRange_3); // VCC=2.7~3.6V之间!!
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if (status != FLASH_COMPLETE)
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break; // 发生错误了
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}
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else
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addrx += 4;
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}
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}
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if (status == FLASH_COMPLETE)
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{
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while (WriteAddr < endaddr) // 写数据
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{
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if (FLASH_ProgramWord(WriteAddr, *pBuffer) != FLASH_COMPLETE) // 写入数据
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{
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break; // 写入异常
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}
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WriteAddr += 4;
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pBuffer++;
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}
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}
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FLASH_DataCacheCmd(ENABLE); // FLASH擦除结束,开启数据缓存
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FLASH_Lock(); // 上锁
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}
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// 从指定地址开始读出指定长度的数据
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// ReadAddr:起始地址
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// pBuffer:数据指针
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// NumToRead:字(4位)数
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void STMFLASH_Read(u32 ReadAddr, u32 *pBuffer, u32 NumToRead)
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{
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u32 i;
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for (i = 0; i < NumToRead; i++)
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{
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pBuffer[i] = STMFLASH_ReadWord(ReadAddr); // 读取4个字节.
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ReadAddr += 4; // 偏移4个字节.
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}
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}
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void drv_flash_Init(void)
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{
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FLASH_Unlock();
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FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
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FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);
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}
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