#ifdef __cplusplus extern "C" { #endif #include "spi.h" #include "nvic.h" #define GPIO_SPI1 GPIOA #define RCC_SPI1 RCC_APB2Periph_GPIOA #define SPI1_NSS GPIO_Pin_4 #define SPI1_SCK GPIO_Pin_5 #define SPI1_MISO GPIO_Pin_6 #define SPI1_MOSI GPIO_Pin_7 #define GPIO_SPI2 GPIOB #define RCC_SPI2 RCC_APB2Periph_GPIOB #define SPI2_NSS GPIO_Pin_12 #define SPI2_SCK GPIO_Pin_13 #define SPI2_MISO GPIO_Pin_14 #define SPI2_MOSI GPIO_Pin_15 void PB_SPI_Init(uint8_t SPI_Channel, unsigned char GPIO_AF) // SPI interface initialization, input parameter SPI1 SPI2 { SPI_TypeDef *SPIx; SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; // initialize SPI structure SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // SPI设置为两线全双工 SPI_InitStructure.SPI_Mode = SPI_Mode_Master; // config SPI working on master mode SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; // SPI发送接收为8位数据帧结构 SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; // 串行时钟在不操作时,时钟为低电平 SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; // 第一个时钟沿开始采集数据 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; // NSS有软件(使用SSI为)管理 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; // SPI波特率预分频值为8 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; // data start transmiss at MSB SPI_InitStructure.SPI_CRCPolynomial = 7; // CRC值计算的多项式 if (SPI_Channel == 1) { SPIx = SPI1; } else if (SPI_Channel == 2) { SPIx = SPI2; } else if (SPI_Channel == 3) { SPIx = SPI3; } else { return; } if (SPIx == SPI1) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); if (GPIO_AF == 0) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = SPI1_MISO | SPI1_MOSI | SPI1_SCK; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // Multiplexing push-pull output GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIO_SPI1, &GPIO_InitStructure); GPIO_SetBits(GPIO_SPI1, SPI1_MISO | SPI1_MOSI | SPI1_SCK); } else if (GPIO_AF == 1) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOB, ENABLE); GPIO_PinRemapConfig(GPIO_Remap_SPI1, ENABLE); // Pin Multiplexing to spi1 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // Multiplexing push-pull output GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIO_SPI1, &GPIO_InitStructure); GPIO_SetBits(GPIO_SPI1, GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5); } } else if (SPIx == SPI2) { RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); if (GPIO_AF == 0) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin = SPI2_MISO | SPI2_MOSI | SPI2_SCK; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // Multiplexing push-pull output GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIO_SPI2, &GPIO_InitStructure); GPIO_SetBits(GPIO_SPI2, SPI2_MISO | SPI2_MOSI | SPI2_SCK); } else if (GPIO_AF == 1) { } } SPI_Init(SPIx, &SPI_InitStructure); SPI_Cmd(SPIx, ENABLE); PB_SPI_ReadWriteByte(SPI_Channel, 0xff); // start transmission } uint8_t PB_SPI_ReadWriteByte(uint8_t SPI_Channel, uint8_t TxData) { SPI_TypeDef *SPIx; if (SPI_Channel == 1) { SPIx = SPI1; } else if (SPI_Channel == 2) { SPIx = SPI2; } else if (SPI_Channel == 3) { SPIx = SPI3; } else { return 0; } while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET) ; // flag of send cache is not reset SPI_I2S_SendData(SPIx, TxData); // send data while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET) ; // flag of receivecache is not reset return SPI_I2S_ReceiveData(SPIx); // receive data } #ifdef __cplusplus } #endif