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求教SPI的问题

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考哥|

楼主 | 2018-7-3 16:04 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

spi, TE, flash, se, AD

这两个函数没看懂
第一：u32 SPI_FLASH_ReadID(void)
{
  u32 Temp = 0, Temp0 = 0, Temp1 = 0, Temp2 = 0;
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send &quot;RDID &quot; instruction */
  SPI_FLASH_SendByte(W25X_JedecDeviceID);
  /* Read a byte from the FLASH */
  Temp0 = SPI_FLASH_SendByte(Dummy_Byte);
  /* Read a byte from the FLASH */
  Temp1 = SPI_FLASH_SendByte(Dummy_Byte);
  /* Read a byte from the FLASH */
  Temp2 = SPI_FLASH_SendByte(Dummy_Byte);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();
  Temp = (Temp0 << 16) | (Temp1 << 8) | Temp2;
  return Temp;
}

第二：u32 SPI_FLASH_ReadDeviceID(void)
{
  u32 Temp = 0;
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send &quot;RDID &quot; instruction */
  SPI_FLASH_SendByte(W25X_DeviceID);
  SPI_FLASH_SendByte(Dummy_Byte);
  SPI_FLASH_SendByte(Dummy_Byte);
  SPI_FLASH_SendByte(Dummy_Byte);

  /* Read a byte from the FLASH */
  Temp = SPI_FLASH_SendByte(Dummy_Byte);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();
  return Temp;
}

新手，求理解

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