一闪一闪亮晶晶—led灯闪烁
Goals
最小系统板上有两个led，一个是电源指示灯，另一个是连在GPIO上的。
让连在GPIO上的led闪烁，频率随意。
what do you want？
1、最小系统电路图
led与哪一个GPIO相连
2、延时函数
3、GPIO配置函数
Material
hardware material
1、电路图
驱动 PC13 端口即可
software materail
1、延时函数
使用正点原子提供的SYSTEM文件夹里面的delay文件
#include "delay.h"void delay_init(void);void delay_ms(u16 nms);void delay_us(u32 nus);
2、GPIO配置函数
使用正点原子提供的SYSTEM文件夹里面的sys文件，
其对stm32f10x.h做了进一步封装，增加了IO口的位带操作
#include "sys.h"// enable the clock of the portRCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);// setting the mode of the portGPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_pp;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOC, &GPIO_InitStructure)// setting the level of the portGPIO_SetBits(GPIOC, GPIO_Pin_13); // setting hightGPIO_ResetBits(GPIOC, GPIO_Pin_13); // setting low
Procedure
1、确定业务目标后，提取其要点收集对应原材料
2、创建工程
复制模板工程更改工程名相关属性
新增HATDWARE文件夹，进入后新建LED子文件夹，进入后新建led.c, led.h
目录结构为：
USER main.cstm32f10x_it.csystem_stm32f10x.c还有对应的.h，还有Objects, Listings, DebugConfig SYSTEM delay delay.cdelay.h sys sys.csys.h usart usart.cusart.h HARDWARE LED led.cled.h STM32F10x_FWLibCORE
3、编写led.c 和 led.h
led.h
#ifndef __LED_H#define __LED_H#include "sys.h"// Define the port of LED#define LED PCout(13)void LED_Init(void); // Initailize the port of LEDvoid LED_Light(void); // LED onvoid LED_Dark(void); // LED off#endif
led.c
#include "led.h"// Initailize the port of LEDvoid LED_Init(void) {GPIO_InitTypeDef GPIO_InitStructure;// Enable the clock of the port BRCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Let the mode of PC13 is push-pull outGPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOC, &GPIO_InitStructure);// Let the level of PC13 is heghtGPIO_SetBits(GPIOC, GPIO_Pin_13);}// LED onvoid LED_Dark(void) {// Let the level of PC13 is heightGPIO_SetBits(GPIOC, GPIO_Pin_13);}// LED offvoid LED_Light(void) {// Let the level of PC13 is lowGPIO_ResetBits(GPIOC, GPIO_Pin_13);}
4、编写main.c
#include "delay.h"#include "usart.h"#include "led.h"int main(void) {delay_init();LED_Init();while(1) {delay_ms(100);LED_Light();delay_ms(100);LED_Dark();}}
5、编译下载
Summary & Supplement
1、三种改变单个IO口状态的方法
（1）位带操作
#define LED PCout(13)LED = 1; // the level of the port is heght, but the led is darkLED = 0; // the level of the port is low, but the led is light
（2）库函数操作
GPIO_SetBits(GPIOC, GPIO_Pin_13); // the level of the port is heght, but the led is darkGPIO_ResetBits(GPIOC, GPIO_Pin_13); // the level of the port is low, but the led is light
（3）寄存器操作
GPIOC->BRR = GPIO_Pin_13; // the level of the port is heght, but the led is darkGPIOC->BSRR = GPIO_Pin_13; // the level of the port is low, but the led is light
