这里以【STM32作为SPI主机读写SPI Flash】为例，主要配置参数：双向全双工、主机模式、8位数据、MSB等。1. 标准外设库配置 SPI_InitTypeDef SPI_InitStructure;SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //双向全双工SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //主机模式SPI_I...
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial = 7; SPI_Init(SPI1, &SPI_InitStructure); // 使能...
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;//选择了串行时钟的稳态:时钟悬空高 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;//数据捕获于第二个时钟沿 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//NSS信号由硬件(NSS管脚)还是软件(使用SSI位)管理:内部NSS信号有SSI位控制 SPI_InitStructure.SPI_BaudRate...
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //串行同步时钟的第二个跳变沿（上升或下降）数据...
SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge; SPI_InitStructure.SPI_NSS= SPI_NSS_Soft; / /SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_4; SPI_InitStructure.SPI_FirstBit= SPI_FirstBit_MSB ;/ /SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial=7; ...
uint16_t SPI_CPOL; /*!< Specifies the serial clock steady state. This parameter can be a value of @ref SPI_Clock_Polarity */ uint16_t SPI_CPHA; /*!< Specifies the clock active edge for the bit capture. This parameter can be a value of @ref SPI_Clock_Phase */ ...
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //主模式 SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b; //16bit宽度 SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; ...
SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;//CPHA = 1,,就是主机会对MOSI引脚进行电平采样在时钟的第二个条边沿【看从机的数据手册的时序图】 SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;//片选引脚有软件代码控制【看从机的数据手册的时序图】 SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescale...
第四个参数SPI_CPOL用来设置时钟极性,我们设置串行同步时钟的空闲状态为高电平所以我们选择SPI_CPOL_High。 第五个参数SPI_CPHA用来设置时钟相位,也就是选择在串行同步时钟的第几个跳变沿(上升或下降)数据被采样,可以为第一个或者第二个条边沿采集,这里我们选择第二个跳变沿,所以选择SPI_CPHA_2Edge ...
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;SPI_...