在网站上做远程教育系统多少钱口碑营销案例2021
测试内核input 事件测试程序。
getevent -lt 命令查看注册的是是event0/1/2/3/4 中的哪一个。
gcc input_test.c -o input_test 编译成可执行程序。
将编译的input_test，U盘或ADB push到系统里面，chmod 777 input_test 在 ./input_test
input_test.c
#include <stdlib.h>
#include <poll.h>
#include <unistd.h>
#include <stddef.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <hcuapi/input.h>
#include <kernel/lib/console.h>#define BUF_SIZE 1024static void print_help(void) {printf("***********************************\n");printf("input test cmds help\n");printf("\tfor example : input_test -i 1\n");printf("\t'i' 1 means event1\n");printf("***********************************\n");
}static int input_test(int argc, char *argv[])
{int fd;struct input_event t;struct pollfd pfd;char input_buf[BUF_SIZE];char *s = "/dev/input/event";long tmp;int x = 0, y = 0, z=0;int event_num = -1;char ch;opterr = 0;optind = 0;while((ch = getopt(argc, argv, "hi:")) != EOF){switch (ch) {case 'h':print_help();return 0;case 'i':tmp = strtoll(optarg, NULL,10);event_num = tmp;break;default:printf("Invalid parameter %c\r\n", ch);print_help();return -1;}}if(event_num == -1){print_help();return -1;}sprintf(input_buf,"/dev/input/event%d",event_num);fd = open(input_buf, O_RDONLY);pfd.fd = fd;pfd.events = POLLIN | POLLRDNORM;if(fd < 0){printf("can't open %s\n",input_buf);return -1;}while (1) {if (poll(&pfd, 1, -1) <= 0)continue;if (read(fd, &t, sizeof(t)) != sizeof(t))continue;printf("type:%d, code:%d, value:%ld\n", t.type, t.code, t.value);if (t.type == EV_KEY) {printf("key %d %s\n", t.code,(t.value) ? "Pressed" : "Released");if (t.code == KEY_POWER && !t.value) {while (read(fd, &t, sizeof(t)) == sizeof(t));break;}}else{if (t.type == EV_ABS){if (t.type == EV_ABS&& t.code == ABS_X) {x = t.value;}if (t.type == EV_ABS && t.code == ABS_Y) {y = t.value;}if (t.type == EV_ABS && t.code == ABS_Z) {z = t.value;}}if (t.type == EV_SYN) {printf("(%4d %4d %4d)\n",x,y,z);}}}close(fd);return 0;
}CONSOLE_CMD(input, NULL, input_test, CONSOLE_CMD_MODE_SELF, "input test, press power to exit test")