STM32外设初始化C语言代码（SPI、UART、TIME、CLOCK）

// /*--------------------------------------------------------------------------- ; ; FILE NAME: InitDevice.C ; ; DESCRIPTION: 初始化. ; ; ;---------------------------------------------------------------------------*/ // #include "InitDevice.h" /// //---------------------------------------------------------------------------- /// void SysTemTime_Init(void) { ErrorStatus HSEStartUpStatus; RCC_DeInit();//RCC设为默认值 RCC_HSEConfig(RCC_HSE_ON);//打开外部晶振 HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus == SUCCESS)//等待外部晶振工作 { RCC_HCLKConfig(RCC_SYSCLK_Div1);//设置AHB时钟(HCLK)为系统时钟 RCC_PCLK2Config(RCC_HCLK_Div1);//设置APB2时钟 = HCLK时钟 RCC_PCLK1Config(RCC_HCLK_Div2);//设置APB1时钟 = HCLK时钟/2 RCC_ADCCLKConfig(RCC_PCLK2_Div8);//8分频 FLASH_SetLatency(FLASH_Latency_2);//设置FLASH代码延时 FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//使用预取值缓存 RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);//使用PLL时钟 = HSE时钟*9 = 8M*9 = 72M RCC_PLLCmd(ENABLE);//使能PLL while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);//等待PLL准备就绪 RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);//设置PLL为系统时钟源 while(RCC_GetSYSCLKSource() != 0x08);//判断PLL是否为系统时钟 } } void Time2_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);//允许定时器2时钟 TIM_DeInit(TIM2);//定时器2设为缺省值 TIM_InternalClockConfig(TIM2);//采用内部时钟给定时器2提供时钟源 TIM_TimeBaseStructure.TIM_Prescaler = (72 - 1);//72M/72=1M TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//设置时钟分割 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数 TIM_TimeBaseStructure.TIM_Period = (1000 - 1);//1000次溢出一次(1MS) TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);//配置写入定时器2 TIM_ClearFlag(TIM2, TIM_FLAG_Update);//清除溢出中断标志 TIM_ARRPreloadConfig(TIM2, DISABLE);//禁止ARR预装载缓冲器 TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);//开启定时器2中断 TIM_Cmd(TIM2,ENABLE);//开启定时器2 } void Uart1_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); /* GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; // 打开GPIO和USART部件的时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //将USART Tx的GPIO配置为推挽复用模式 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); // 将USART Rx的GPIO配置为浮空输入模式 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, &USART_InitStructure); // 若接收数据寄存器满，则产生中断 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能 USART1， 配置完毕 USART_Cmd(USART1, ENABLE); // 如下语句解决第1个字节无法正确发送出去的问题 USART_ClearFlag(USART1, USART_FLAG_TC); // 清标志*/ } void Uart2_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; /* 打开GPIO和USART部件的时钟 */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); /* 将USART Tx的GPIO配置为推挽复用模式 */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* 将USART Rx的GPIO配置为浮空输入模式*/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART2, &USART_InitStructure); /* 若接收数据寄存器满，则产生中断 */ USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); /* 使能 USART1， 配置完毕 */ USART_Cmd(USART2, ENABLE); /* 如下语句解决第1个字节无法正确发送出去的问题 */ USART_ClearFlag(USART2, USART_FLAG_TC); // 清标志 } void SPI2_Init(void) { SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; // 打开GPIOB及复用时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE); // 打开SPI2时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); //GPIOB GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOB, &GPIO_InitStructure); // SPI2 configuration SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //SPI2设置为两线全双工 SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI2为主 SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b; //SPI2发送接收8位帧结构 SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //串行时钟在不操作时，时钟低电平 SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //第1个时钟沿开始采样数据 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由软件（使用SSI位）管理 SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;//定义波特率预分频的值:波特率预分频值为 SCLK=36M/2 18M SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //数据传输从MSB位开始 //SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式 SPI_Init(SPI2, &SPI_InitStructure); // SPI_I2S_ITConfig(SPI2,SPI_I2S_IT_RXNE,ENABLE); //如果SPI2接收满则产生中断 SPI_Cmd(SPI2, ENABLE); //使能SPI2外设 } void Int_Init(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);//选择中断分组0 //定时器2中断 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;//选择定时器2中断通道 //NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//抢占式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//响应式中断优先级设置为1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能中断 NVIC_Init(&NVIC_InitStructure); /* //UART1中断 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//响应式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); */ //UART2中断 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//响应式中断优先级设置为0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void Init_Device(void) { SysTemTime_Init(); Int_Init(); SPI2_Init(); Time2_Init(); Uart1_Init(); Uart2_Init(); } /// //---------------------------------------------------------------------------- ///