控制stm32开发版的LED闪烁周期实验 -

以下是主代码
#include "stm32f4xx.h"
#include "led.h"
#include "delay.h"
#include "usart.h"
u8 Res = '1';
int led_num;
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //éè???òá??D??×é
LED_Init();
delay_Init(168);
USART1_Init(115200);
while(1)
{
printf("recive : %c\n", Res);
led_num=Res-'0';
if(led_num==1)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_haomiao(500);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_haomiao(500);
}
else if(led_num==2)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_haomiao(1000);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_haomiao(1000);
}
else if(led_num==3)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(1);
delay_haomiao(500);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(1);
delay_haomiao(500);
}
else if(led_num==4)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(2);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(2);
}
else if(led_num==5)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(2);
delay_haomiao(500);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(2);
delay_haomiao(500);
}
else if(led_num==6)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(3);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(3);
}
else if(led_num==7)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(3);
delay_haomiao(500);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(3);
delay_haomiao(500);
}
else if(led_num==8)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(4);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(4);
}
else if(led_num==9)
{
GPIO_ResetBits(GPIOF, GPIO_Pin_9);
delay_miao(4);
delay_haomiao(500);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
delay_miao(4);
delay_haomiao(500);
}
}
}
void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
Res = USART_ReceiveData(USART1); }
}
以下是调用的函数代码
(led.c)
#include "led.h"
void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//ê1?üGPIOAê±?ó
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);
//????GPIO2?êy
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Fast_Speed;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOF, &GPIO_InitStructure);
GPIO_SetBits(GPIOF, GPIO_Pin_9);
GPIO_SetBits(GPIOF, GPIO_Pin_10);
}
(delay.h)
#include "delay.h"
u8 my_us = 0;
u16 my_ms = 0;
/**
* 延时功能初始化
*/
void delay_Init(u8 fsc)
{
//配置系统滴答时钟源
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
//系统总线最高时钟频率进行8分频后得到的值
my_us = fsc/8;
my_ms = (fsc/8)*1000;
}
/**
* 微秒延时函数
*/
void delay_us(u32 us)
{
u32 uTime = 0;
//Systick寄存器配置
SysTick->LOAD = us*my_us; //自动装载值
SysTick->VAL = 0x00; //Systick定时器当前值
SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; //使能Systick定时器
do{
uTime = SysTick->CTRL;
}while(!(uTime & (1<<16)));
SysTick->VAL = 0x00; //Systick定时器当前值
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; //关闭Systick定时器
}
/**
* 毫秒延时函数
*/
void delay_ms(u32 ms)
{
u32 mTime = 0;
//Systick寄存器配置
SysTick->LOAD = ms*my_ms; //自动装载值
SysTick->VAL = 0x00; //Systick定时器当前值
SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; //使能Systick定时器
do{
mTime = SysTick->CTRL;
}while(!(mTime & (1<<16)));
SysTick->VAL = 0x00; //Systick定时器当前值
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; //关闭Systick定时器
}
/**
* 秒延时函数
*/
void delay_s(u32 s)
{
u32 i = 0;
for(;i<s; i++)
{
delay_ms(500);
delay_ms(500);
}
}
(usart.h)
#include "usart.h"
//加入以下代码,支持printf函数
#if 1
#pragma import(__use_no_semihosting)
//标准库需要的支持函数
struct __FILE
{
int handle;
};
FILE __stdout;
//定义_sys_exit()以避免使用半主机模式
void _sys_exit(int x)
{
x = x;
}
//重定义fputc函数
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);//循环发送,直到发送完毕
USART1->DR = (u8) ch;
return ch;
}
#endif
void USART1_Init(uint32_t baud) //初始化串口1
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//开启串口时钟和GPIO时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能串口1IO口的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //使能串口1通道时钟
//配置串口1相应IO口，将其模式设置为复用模式 -- PA9 PA10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//串口1对应引脚复用映射
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
//配置并初始化串口结构体参数
USART_InitStructure.USART_BaudRate = baud;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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_Init(USART1, &USART_InitStructure);
#if 1
//配置内嵌向量中断控制器NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//打开串口1中断
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
#endif
//打开串口1
USART_Cmd(USART1, ENABLE);
}

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