我就是来点个灯，源码如下。有可以测试的就测试一下吧。/* Copyright -20220809- shen All Rights Reserved. */ #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <stdbool.h> #include <string.h> #include <getopt.h> #include <signal.h> #include <unistd.h> #include <errno.h> #include <libgen.h> /* Get array size */ #define ARRAY_SIZE(array) sizeof(array) / sizeof(array[0]) /* Exit flag */ volatile bool g_quit = false; /* User-operable LEDs */ static char *g_leds[1] = { "/sys/class/leds/blue" }; void sig_handle(int arg) { g_quit = true; } int main(int argc, char **argv) { int i = 0; int c = 0; int num = 0; int flag = 0; char cmd[64] = {0}; while (!g_quit) { /* Turn on LEDs */ { /* Set the LED brightness value to 0 to turn on the led */ snprintf(cmd, 64, "echo 0 > %s/brightness", g_leds[0]); if (system(cmd) != 0) { fprintf(stderr, "Error: Failed to turn on %s\n", g_leds[0]); exit(EXIT_FAILURE); } else { fprintf(stderr, "LED:%s LED_ON \n", g_leds[0]); } } /* Keep the LEDs on for 1000 ms */ usleep(1000 * 1000); /* Turn off LEDs */ { /* Set the LED brightness value to 1 to turn off the LED */ snprintf(cmd, 64, "echo 1 > %s/brightness", g_leds[i]); if (system(cmd) != 0) { fprintf(stderr, "Error: Failed to turn off %s\n", g_leds[0]); exit(EXIT_FAILURE); } else { fprintf(stderr, "LED:%s LED_OFF \n", g_leds[0]); } } /* Keep the LEDs off for 1000 ms */ usleep(1000 * 1000); } printf("Exit\n"); return 0; }
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