void SPI_FLASH_SectorErase(u32 SectorAddr)
{
/* Send write enable instruction */
SPI_FLASH_WriteEnable();
SPI_FLASH_WaitForWriteEnd();
。。。
}
为什么要这两个操作
void SPI_FLASH_WaitForWriteEnd(void)
{
u8 FLASH_Status = 0;
/* Select the FLASH: Chip Select low */
SPI_FLASH_CS_LOW();
/* Send "Read Status Register" instruction */
SPI_FLASH_SendByte(W25X_ReadStatusReg);
/* Loop as long as the memory is busy with a write cycle */
do
{
/* Send a dummy byte to generate the clock needed by the FLASH
and put the value of the status register in FLASH_Status variable */
FLASH_Status = SPI_FLASH_SendByte(Dummy_Byte);
}while ((FLASH_Status & WIP_Flag) == SET); /* Write in progress */
/* Deselect the FLASH: Chip Select high */
SPI_FLASH_CS_HIGH();
}
这个函数是什么意思？ |
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