注册字符设备使用gpio设备树节点控制led三盏灯的亮灭 设备树: 头文件: #ifndef __HEAD_H__#define __HEAD_H__typedef struct{unsigned int MODER;unsigned int OTYPER;unsigned int OSPEEDR;unsigned int PUPDR;unsigned int IDR;unsig
有八层灯塔,每层的灯数都是上一层的一倍,共有765 盏灯,编程求最上层与最下层的灯数。 #include <stdio.h>int main(){int n = 1 , m , sum , i; while (1){m = n; sum = 0;for (i = 1; i < 8; i++){m = m * 2; sum += m; }sum += n; if (sum == 765) {p