STM32的SPI接口
SPI接口:
MISO——主设备输入/从设备输出
MOSI——主设备输出/从设备输入
SCK——串口时钟
NSS——从设备选择
初始化例程如下:
void SPI_Init(void)
SPI_InitTypeDef
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; //PA5.6.7复用
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_3);
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;//SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE); //使能SPI外设
SPI_ReadWriteByte(0xff);//启动传输
u8 SPIx_ReadWriteByte(u8 TxData)
不依靠软件库的初始化:
SPI1->CR1|=0<10;//全双工模式
SPI1->CR1|=1<9; //软件nss管理
SPI1->CR1|=1<8;
SPI1->CR1|=1<2; //SPI主机
SPI1->CR1|=0<11;//8bit数据格式
SPI1->CR1|=1<1; //空闲模式下SCK为1 CPOL=1
SPI1->CR1|=1<0; //数据采样从第二个时间边沿开始,CPHA=1
SPI1->CR1|=7<3; //Fsck=Fcpu/256
SPI1->CR1|=0<7; //MSBfirst
SPI1->CR1|=1<6; //SPI设备使能
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