快速读SPI函数
void SPI_FLASH_BufferRead(uint8* pBuffer, uint32 ReadAddr, uint16 NumByteToRead)
{
SPI_FLASH_CS_LOW();
SPI_FLASH_SendByte(W25X_FastReadData);
SPI_FLASH_SendByte((ReadAddr & 0xFF0000) >> 16);
SPI_FLASH_SendByte((ReadAddr& 0xFF00) >> 8);
SPI_FLASH_SendByte(ReadAddr & 0xFF);
SPI_FLASH_SendByte(Dummy_Byte);
while (NumByteToRead--)
{
*pBuffer = SPI2_Send_Byte(Dummy_Byte);
pBuffer++;
}
SPI_FLASH_CS_HIGH();
}
SPI2初始化
void SPI2_Configuration(void)
{
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE);
}
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