STM32 SPI 配置完连续发数据，SCK无时钟输出,示波器无输出

只看该作者 · 2014-8-13 21:38

STM32 SPI 配置完连续发数据，SCK无时钟输出,示波器无输出

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); }