|
STM32 SPI 配置完 连续发数据,SCK无时钟输出,示波器无输出
[复制链接]
void SPI2_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;//SCK,SI
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;//SO
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IPU ;
GPIO_Init(GPIOB, &GPIO_InitStructure);
SPI_InitTypeDef SPI_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //双工模式
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //SPI主模式
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //8bit数据
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //CLK空闲时为低电平
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //第一个上升沿采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //片选用软件控制????????????
SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_64; //SPI频率
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //高位在前
SPI_InitStructure.SPI_CRCPolynomial = 7; //crc7,stm32spi带硬件ecc
SPI_Init(SPI2, &SPI_InitStructure);
SPI_Cmd(SPI2, ENABLE);
}
|
|