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