stm32中引脚和一些功能模块的一般配置方法

注意，初始化任意东西，都得最先配置这个GPIO或者模块的时钟，不然会失败

/*************************************************
Function: void USART_Config(void)
Description: USART配置函数
Input: 无
Output:无
Return:无
*************************************************/
void USART_Config(void)
{
//需要初始化的三个结构体
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStruct;

//----使能模块时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6, ENABLE); //开启USART6时钟

//----使能GPIO引脚时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

//------------------------------配置串口模块的功能 //----选择模块利用引脚 GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART6);//这相当于M3的开启复用时钟？只配置复用的引脚， GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_USART6); //------------------------------配置GPIOC引脚
//----缺省值填入 GPIO_StructInit(&GPIO_InitStructure); //----配置GPIOC_Pin6为TX输出 GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF; //设置为复用，必须为AF，OUT不行 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC,&GPIO_InitStructure);
//--------配置GPIOC_Pin7为RX输入 GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF; //这也必须为复用，与M3不同！ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC,&GPIO_InitStructure); //-----------------------------------------------
//IO引脚复用功能设置，与之前版本不同 //----------配置USART6 //---------------------缺省值填入 USART_StructInit(&USART_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(USART6, &USART_InitStructure); //--------缺省值填入 USART_ClockStructInit(&USART_ClockInitStruct);
USART_ClockInit(USART6, &USART_ClockInitStruct); //配置中断，使能相应模块 USART_ITConfig(USART6, USART_IT_RXNE, ENABLE); //使能 USART6中断 USART_Cmd(USART6, ENABLE); //使能 USART6 }

/**名称：USART6中断服务程序
*作用：USART6收到数据后产生中断，并将收到的内容发回给上位机
*/
void USART6_IRQHandler(void)
{
//判断中断状态
if (USART_GetITStatus(USART6, USART_IT_RXNE) != RESET)
{
//--清除中断标志位
USART_ClearITPendingBit(USART6, USART_IT_RXNE);
//USART_SendData(USART6, USART_ReceiveData(USART6)); //发送收到的数据
USART_SendData(USART6, 'n'); //发送收到的数据
STM_EVAL_LEDOn(LED3); //点亮LED，起到中断指示作用
}
}

void MSD0_SPI_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

//SPI模块时钟使能
SPIX_CLK_INIT(SPIX_CLK, ENABLE);

//IO口时钟使能
RCC_AHB1PeriphClockCmd(SPIX_SCK_GPIO_CLK | SPIX_MISO_GPIO_CLK |
SPIX_MOSI_GPIO_CLK | sFLASH_CS_GPIO_CLK, ENABLE);

//--------------------------模块设置
//设置SPI引脚利用功能
GPIO_PinAFConfig(SPIX_SCK_GPIO_PORT, SPIX_SCK_SOURCE, SPIX_SCK_AF);
GPIO_PinAFConfig(SPIX_MISO_GPIO_PORT, SPIX_MISO_SOURCE, SPIX_MISO_AF);
GPIO_PinAFConfig(SPIX_MOSI_GPIO_PORT, SPIX_MOSI_SOURCE, SPIX_MOSI_AF);

//--------------------------相应GPIO设置
//每个GPIO引脚配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;
//--SPI SCK pin configuration
GPIO_InitStructure.GPIO_Pin = SPIX_SCK_PIN;
GPIO_Init(SPIX_SCK_GPIO_PORT, &GPIO_InitStructure);
//--SPI MOSI pin configuration
GPIO_InitStructure.GPIO_Pin =  SPIX_MOSI_PIN;
GPIO_Init(SPIX_MOSI_GPIO_PORT, &GPIO_InitStructure);
//--SPI MISO pin configuration
GPIO_InitStructure.GPIO_Pin =  SPIX_MISO_PIN;
GPIO_Init(SPIX_MISO_GPIO_PORT, &GPIO_InitStructure);
//--片选引脚得单独配置
//--Configure sFLASH Card CS pin in output pushpull mode
GPIO_InitStructure.GPIO_Pin = sFLASH_CS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(sFLASH_CS_GPIO_PORT, &GPIO_InitStructure);

//关闭片选
MSD0_card_disable();

//设置SPI接口
MSD0_SPIHighSpeed(0);

//使能SPI模块
SPI_Cmd(SPIX, ENABLE);
}

/*******************************************************************************
* Function Name  : MSD0_SPIHighSpeed
* Description    : SD Card Speed Set
* Input          : - b_high: 1 = 18MHz, 0 = 281.25Hz
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
void MSD0_SPIHighSpeed(uint8_t b_high)
{
SPI_InitTypeDef SPI_InitStructure;

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;

/* Speed select */
if(b_high == 0)
{
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
}
else
{
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
}

SPI_Init(SPIX, &SPI_InitStructure);
}