void SPI_Initialize()
{
SPI_RCC_Configuration();
SPI_GPIO_Configuration(SPI_Mode_Master);
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_Init(NRF_SPI, &SPI_InitStructure);
SPI_Cmd(NRF_SPI, ENABLE);
SPI_NSSInternalSoftwareConfig(NRF_SPI, SPI_NSSInternalSoft_Set);
}
/**
* @brief 根据外部SPI设备配置SPI相关参数
* @param SPIx 需要使用的SPI
* @retval None
*/
void SPI_Configuration(SPI_TypeDef* SPIx)
{
SPI_InitTypeDef SPI_InitStruct;
SPI_RCC_Configuration(SPIx,0);
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; //波特率预分频值为32 Chain提示此处注意，通信时钟由主SPI的时钟分配而得，不需要设置从SPI的时钟
SPI_InitStruct.SPI_Direction= SPI_Direction_2Lines_FullDuplex; //双线双向全双工
SPI_InitStruct.SPI_Mode = SPI_Mode_Master; //主SPI设备
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b; //SPI数据大小
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low; //时钟悬空低
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge; //数据捕获与第一个时钟沿
SPI_InitStruct.SPI_NSS = SPI_NSS_Hard; //NSS由外部管脚管理
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; //数据传输从MSB开始
SPI_InitStruct.SPI_CRCPolynomial = 7; //定义用于CRC值计算的多项式
SPI_Init(SPIx, &SPI_InitStruct); //配置以上SPI的配置
SPI_GPIO_Configuration(SPIx,0);
SPI_SSOutputCmd(SPIx, ENABLE); //使能指定的SPI SS输出
SPI_Cmd(SPIx, ENABLE); //使能SPI外设
}
