STM32F4串口通信学习资料（含PPT+例程） -

#include "stm32f4xx.h"
//#include "led.h"
//#include "delay.h"
void delay1(int n);
void delay_init(void);
void delay_ms(u16 nms);
void LED_Init(void);
void sysclock_init(void);
void uart_init(void);
void USART1_IRQHandler(void);
// void Adc_Init(void);
// u16 Get_Adc(u8 ch) ;
// u16 Get_Adc_Average(u8 ch,u8 times);
int main(void)
{
// u16 adcx;
// float temp;
//delay_init(168);
sysclock_init();
LED_Init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//???????????2
uart_init(); //?????????115200
// Adc_Init(); //???ADC
while(1){
GPIO_SetBits(GPIOC,GPIO_Pin_2);
GPIO_ResetBits(GPIOF,GPIO_Pin_7);
// delay_ms(5000000);
delay1(5000000);
GPIO_ResetBits(GPIOC,GPIO_Pin_2);
GPIO_SetBits(GPIOF,GPIO_Pin_7);
delay1(5000000);
// USART_SendData(USART1,0x55); //???1????
// while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//??????
}
}
void sysclock_init(void)
{
unsigned int HSEStartUpStatus;
/*???RCC ?????????*/
RCC_DeInit(); /*????????( HSE)*/
RCC_HSEConfig(RCC_HSE_ON); //RCC_HSE_ON ?SE ????(ON)/*??HSE ??*/
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS) //SUCCESS :HSE ???????
{ /*??AHB ??( HCLK)*/
RCC_HCLKConfig(RCC_SYSCLK_Div1); //RCC_SYSCLK_Div1 ?AHB??= ????
/* ????AHB ??( PCLK2 )*/
RCC_PCLK2Config(RCC_HCLK_Div1); //RCC_HCLK_Div1 ?APB2??=HCLK
/*????AHB ??( PCLK1 )*/
RCC_PCLK1Config(RCC_HCLK_Div2); //RCC_HCLK_Div2 ? APB1??=HCLK/2
/*??FLASH ??????????*/
FLASH_SetLatency(FLASH_Latency_2); //FLASH_Latency_2 2 ????
/*??FLASH ????????*/
//FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); // ??????? /*??PLL ????????*/
//RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
// PLL ?????= HSE ????; RCC_PLLMul_9 ?PLL ????x 9 /*??PLL */
RCC_PLLCmd(ENABLE);
/*?????RCC ???(PLL ?????)????*/
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{ }
/*??????( SYSCLK )*/
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//RCC_SYSCLKSource_PLLCLK ???PLL ?????? /* PLL ????????????*/
while(RCC_GetSYSCLKSource() != 0x08); //0x08 :PLL ??????
}
}
void delay1(int n)
{
while(n--);
}
void delay_ms(u16 nms)
{ int i;
for(i=0;i<nms;i++);
}
//??nus
//nus?????us?.
//??:nus??,????798915us
void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF,ENABLE);
//F9
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOC,&GPIO_InitStructure);
GPIO_SetBits(GPIOC,GPIO_Pin_2);
//F10
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType=GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOF,&GPIO_InitStructure);
GPIO_SetBits(GPIOF,GPIO_Pin_7);
}
void uart_init(void){
//GPIO????
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //??GPIOA??
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//??USART1??
//??1????????
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9???USART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10???USART1
//USART1????
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9?GPIOA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //??50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //??????
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //??
GPIO_Init(GPIOA,&GPIO_InitStructure); //???PA9,PA10
//USART1 ?????
USART_InitStructure.USART_BaudRate = 115200;//?????
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//???8?????
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); //?????1
USART_Cmd(USART1, ENABLE); //????1
//USART_ClearFlag(USART1, USART_FLAG_TC);
//#if EN_USART1_RX
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//??????
//Usart1 NVIC ??
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//??1????
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//?????3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ????
NVIC_Init(&NVIC_InitStructure); //??????????VIC????
//#endif
}
void USART1_IRQHandler(void) //??1??????
{
u8 Res;
u8 tempx=2;
Res=3;
tempx+=Res;
Res=USART_ReceiveData(USART1);
tempx+=Res;
USART_SendData(USART1,Res); //???1????
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//??????
//#if SYSTEM_SUPPORT_OS //??SYSTEM_SUPPORT_OS??,?????OS.
// OSIntEnter();
//#endif
// if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //????(?????????0x0d 0x0a??)
// {
// Res =USART_ReceiveData(USART1);//(USART1->DR); //????????
//
// if((USART_RX_STA&0x8000)==0)//?????
// {
// if(USART_RX_STA&0x4000)//????0x0d
// {
// if(Res!=0x0a)USART_RX_STA=0;//????,????
// else USART_RX_STA|=0x8000; //?????
// }
// else //????0X0D
// {
// if(Res==0x0d)USART_RX_STA|=0x4000;
// else
// {
// USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
// USART_RX_STA++;
// if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//??????,??????
// }
// }
// }
// }
//#if SYSTEM_SUPPORT_OS //??SYSTEM_SUPPORT_OS??,?????OS.
// OSIntExit();
//#endif
}

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