开发环境keil4，芯片STM32F103C8T6
1、main.c
//串口实验
#include "sys.h"
#include "delay.h"
#include "key.h"
#define DC12VDO_ON() GPIO_SetBits (GPIOC, GPIO_Pin_13)
#define DC12VDO_OFF() GPIO_ResetBits (GPIOC, GPIO_Pin_13)
int Index1,Index2,Index3 = 0;
int time1;
unsigned char gUart_Rece_Buf1[256];
unsigned char gUart_Rece_Buf2[256];
unsigned char gUart_Rece_Buf3[2048];
int i,j=0;
u8 key;
int main(void)
{
delay_init(); //延时函数初始化
sys_Init(); //系统初始化（时钟初始化、中断初始化、GPIOx初始化、串口1初始化、串口2初始化、串口3初始化）
while(1)
{
DC12VDO_OFF();//led常亮
key=KEY_Scan();
if(key==1)
{
DC12VDO_ON();//灭led
delay_ms(1000);//等待
}
}
}
2、key.c
#include "key.h"
#include "delay.h"
#include "sys.h"
uint8_t K1_Value;
u8 KEY_Scan(void)
{
if(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0))
{
delay_ms(20); //防抖
if(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0))
{
K1_Value=1;
while(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0));
}
}
else K1_Value=0;
return K1_Value;
}
3、delay.c
#include "delay.h"
#include "sys.h"
//////////////////////////////////////////////////////////////////////////////////
static u8 fac_us=0;//us延时倍乘数
static u16 fac_ms=0;//ms延时倍乘数
void delay_init()
{
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //选择外部时钟 HCLK/8
fac_us=SystemCoreClock/8000000; //为系统时钟的1/8
fac_ms=(u16)fac_us*1000; //非OS下,代表每个ms需要的systick时钟数
}
void delay_us(u32 nus)
{
u32 temp;
SysTick->LOAD=nus*fac_us; //时间加载
SysTick->VAL=0x00; //清空计数器
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
do
{
temp=SysTick->CTRL;
}while((temp&0x01)&&!(temp&(1<<16))); //等待时间到达
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
void delay_ms(u16 nms)
{
u32 temp;
SysTick->LOAD=(u32)nms*fac_ms; //时间加载(SysTick->LOAD为24bit)
SysTick->VAL =0x00; //清空计数器
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
do
{
temp=SysTick->CTRL;
}while((temp&0x01)&&!(temp&(1<<16))); //等待时间到达
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
4、sys.c
#include "sys.h"
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;//HSEStartUpStatus是枚举函数的参数，两个参数ERROR = 0, SUCCESS = !ERROR
/* Setup the microcontroller system. Initialize the Embedded Flash Interface,
initialize the PLL and update the SystemFrequency variable. */
//SystemInit();
/* RCC system reset(for debug purpose) */
RCC_DeInit(); //初始化RCC
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* Enable GPIOx clock */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC , ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB , ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA , ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO , ENABLE );
/* Enable USART1&2 clocks */
// Enable GPIOA clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE );
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );
/* Enable USART3 clocks */
// Enable GPIOB clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE );
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//--------------------------->PB0
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//-------------------------USART1_TX-->PA9 , USART1_RX-->PA10
/* Configure USART1_Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART1_Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//-------------------------USART2_TX-->PA2 , USART2_RX-->PA3
/* Configure USART2_Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2_Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//-------------------------USART3_TX-->PB10 , USART3_RX-->PB11
/* Configure USART3_Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure USART3_Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
#define VECT_TAB_FLASH
//#define VECT_TAB_FLASH_IAP
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#if defined (VECT_TAB_RAM)
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#elif defined(VECT_TAB_FLASH_IAP)
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x18000);
__set_FAULTMASK(0);//开放总中断
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
//__set_FAULTMASK(0);//开放总中断
#endif
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART3 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*******************************************************************************
* Function Name : USART1_Configuration
* Description : Configures USART1.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART1_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
/* USART1 configuration ------------------------------------------------------*/
/*
USART1 configured as follow:
- BaudRate = 9600 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 9600;
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_InitStructure.USART_Mode = USART_Mode_Rx;
/* Configure the USART1 */
USART_Init(USART1, &USART_InitStructure);
/* Enable USART1 Receive interrupt */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
/* Enable the USART1 */
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
}
/*******************************************************************************
* Function Name : USART2_Configuration
* Description : Configures USART2.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART2_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
/* USART2 configuration ------------------------------------------------------*/
/*
USART2 configured as follow:
- BaudRate = 9600 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 9600;
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_InitStructure.USART_Mode = USART_Mode_Rx;
/* Configure the USART2 */
USART_Init(USART2, &USART_InitStructure);
/* Enable USART2 Receive interrupt */
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
/* Enable the USART2 */
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
}
/*******************************************************************************
* Function Name : USART3_Configuration
* Description : Configures USART3.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART3_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
/* USART3 configuration ------------------------------------------------------*/
/*
USART3 configured as follow:
- BaudRate = 9600 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
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_InitStructure.USART_Mode = USART_Mode_Rx;
/* Configure the USART3 */
USART_Init(USART3, &USART_InitStructure);
/* Enable USART3 Receive interrupt */
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
/* Enable the USART3 */
USART_Cmd(USART3, 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(USART3, USART_FLAG_TC); // 清标志
}
//BSP初始化函数
void sys_Init(void)
{
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
USART1_Configuration();
USART2_Configuration();
USART3_Configuration();
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* Input : - file: pointer to the source file name
* - line: assert_param error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
来源：https://www.cnblogs.com/Mr-choa/p/12659492.html