STM32 SPI 擦除sector扇区W25QXX_Wait_Busy()

hyj1013 · 发表于 2020-5-23 15:39:58

void W25QXX_Erase_Sector(u32 Dst_Addr)
{
//监视falsh擦除情况,测试用
  //printf("fe:%x\r\n",Dst_Addr);
  Dst_Addr*=4096;
W25QXX_Write_Enable();                //SET WEL
W25QXX_Wait_Busy();
W25QXX_CS=0;                         //使能器件
SPI5_ReadWriteByte(W25X_SectorErase); //发送扇区擦除指令
if(W25QXX_TYPE==W25Q256)             //如果是W25Q256的话地址为4字节的，要发送最高8位
{
      SPI5_ReadWriteByte((u8)((Dst_Addr)>>24));
}
SPI5_ReadWriteByte((u8)((Dst_Addr)>>16));  //发送24bit地址
SPI5_ReadWriteByte((u8)((Dst_Addr)>>8));
SPI5_ReadWriteByte((u8)Dst_Addr);
W25QXX_CS=1;                         //取消片选
W25QXX_Wait_Busy();          //等待擦除完成
}

问题：为什么调用两次W25QXX_Wait_Busy()？

showMe · 发表于 2020-5-23 15:40:00

默默的路过，帮顶

hyj1013 · 发表于 2020-5-23 15:46:27

这个我猜测要读懂WQ25XX的芯片手册

hyj1013 · 发表于 2020-5-23 15:50:37

BUSY is a read only bit in the status register (S0) that is set to a 1 state when the device is executing a Page Program, Sector Erase, Block Erase, Chip Erase or Write Status Register instruction. During this time the device will ignore further instructions except for the Read Status Register and Erase Suspend instruction (see tW, tPP, tSE, tBE, and tCE in AC Characteristics). When the program, erase or write status register instruction has completed, the BUSY bit will be cleared to a 0 state indicating the device is ready for further instructions.
BUSY是状态寄存器（S0）中的只读位，当设备执行页程序、扇区擦除、块擦除、芯片擦除或写入状态寄存器指令时，该位被设置为1状态。在此期间，设备将忽略除读取状态寄存器和擦除挂起指令以外的其他指令（请参阅交流特性中的tW、tPP、tSE、tBE和tCE）。当程序、擦除或写入状态寄存器指令完成时，忙碌位将被清除到0状态，指示设备已准备好接受进一步指令。