STM32F2系列外设设置规则

外设设置规则：

在配置之前必须添加外设的.c文件，以及相应包含的.h。.h文件在stm32f2xx_conf.h中添加。

1、 时钟设置：包括引脚时钟和外设时钟：

RCC_XXXPeriphClockCmd();

2、 引脚连接：即把引脚和外设功能进行连接；

GPIO_PinAFConfig();

如下功能需要引脚与外设连接。

* @arg GPIO_AF_RTC_50Hz

* @arg GPIO_AF_MCO

* @arg GPIO_AF_TAMPER

* @arg GPIO_AF_SWJ

* @arg GPIO_AF_TRACE

* @arg GPIO_AF_TIM1

* @arg GPIO_AF_TIM2

* @arg GPIO_AF_TIM3

* @arg GPIO_AF_TIM4

* @arg GPIO_AF_TIM5

* @arg GPIO_AF_TIM8

* @arg GPIO_AF_TIM9

* @arg GPIO_AF_TIM10

* @arg GPIO_AF_TIM11

* @arg GPIO_AF_I2C1

* @arg GPIO_AF_I2C2

* @arg GPIO_AF_I2C3

* @arg GPIO_AF_SPI1

* @arg GPIO_AF_SPI2

* @arg GPIO_AF_SPI3

* @arg GPIO_AF_USART1

* @arg GPIO_AF_USART2

* @arg GPIO_AF_USART3

* @arg GPIO_AF_UART4

* @arg GPIO_AF_UART5

* @arg GPIO_AF_USART6

* @arg GPIO_AF_CAN1

* @arg GPIO_AF_CAN2

* @arg GPIO_AF_TIM12

* @arg GPIO_AF_TIM13

* @arg GPIO_AF_TIM14

* @arg GPIO_AF_OTG1_FS

* @arg GPIO_AF_OTG2_HS

* @arg GPIO_AF_ETH

* @arg GPIO_AF_FSMC

* @arg GPIO_AF_OTG2_FS

* @arg GPIO_AF_SDIO

* @arg GPIO_AF_DCMI

* @arg GPIO_AF_EVENTOUT

3、 初始化GPIO配置：

GPIO_Init();

4、 外设初始化：

如UART初始化如下：

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(USARTx, &USART_InitStructure)；

ADC初始化如下：（多路模式）

// DMA1_Stream0 channel0 configuration **************************************/

DMA_DeInit(DMA2_Stream0);

DMA_InitStructure.DMA_Channel = DMA_Channel_0;

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; //定义外设基址

DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValue; //定义寄存器基址

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //定义DMA传输模式从外设到内存

DMA_InitStructure.DMA_BufferSize = 4; //定义buffer大小，根据通道数来定

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //DMA寄存器随之增加（单通道不增加）

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //DMA外设数据大小，16位半字

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //DMA存储器数据大小，16位半字

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //模式为循环模式

DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级高

DMA_InitStructure.DMA_DirectMode = DMA_DirectMode_Disable; //直接传输模式无效 DMA_InitStructure.DMA_FifoThreshold = DMA_FifoThreshold_HalfFull;

DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA2_Stream0, &DMA_InitStructure);

//************ DMA2_Stream0 enable ************/

DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA流0

//***************** ADCs DeInit ***************/

ADC_DeInit(); //ADC重初始化

//************* ADC Common Init ****************/

ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC独立模式

ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; //ADC采样周期2分频

ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //采样周期

ADC_CommonInit(&ADC_CommonInitStructure); //基本初始化

//*************** ADC1 Init ********************/

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ADC采样精度

ADC_InitStructure.ADC_ScanConvMode = ENABLE; //采用扫描模式，因为多路

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续扫描模式

ADC_InitStructure.ADC_ExternalTrigConvPolarity = ADC_ExternalTrigConvPolarity_None;//无外部触发

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据右对齐

ADC_InitStructure.ADC_NbrOfChannel = 4; //采样通道数

ADC_Init(ADC1, &ADC_InitStructure);

//************ ADC1 regular channel12 configuration ************/

ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_3Cycles);

ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);

ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_3Cycles);

ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_3Cycles);

//********* Enable DMA request after last transfer (Multi-ADC mode) *********/

ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

//*********** Enable ADC1 DMA ****************/

ADC_DMACmd(ADC1, ENABLE);

//*************** Enable ADC1 ***************/

ADC_Cmd(ADC1, ENABLE);

//******* Start ADC1 Software Conversion *****/

ADC_SoftwareStartConv(ADC1); //软启动开始采样

5、 中端配置：

以下为串口中断配置：

void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

/* Configure the NVIC Preemption Priority Bits */

/* Configure one bit for preemption priority */

/*优先级组说明了抢占优先级所用的位数，和子优先级所用的位数在这里是1，7 */

NVIC_PriorityGroupConfig(NVIC_PriorityGro