【创龙科技 TL335x-EVM-S评估板试用体验】应用开发之LED流水

2021-11-20 23:32:47 1560

0 1、尝试使用开发方式来进行流水灯的呈现，这次也要用到上次讲到的通过OpenSSH进行文件传输方式 2、评估底板用户指示灯LED设备节点反复交替写入1、0数值，实现LED闪烁效果。LED点亮与熄灭时间均为0.5s。在虚拟机的Ubuntut系统里，先建一个文件夹src,下面两个文件makefile和tl_led_flash.c tl_led_flash.c脚本 /* Copyright 2018 Tronlong Elec. Tech. Co. Ltd. All Rights Reserved. / #include #include #include #include #include #include #include #include #include #include / Get array size / #define ARRAY_SIZE(array) sizeof(array) / sizeof(array[0]) / User-operable LEDs / static char g_leds[] = { "/sys/class/leds/user-led0", "/sys/class/leds/user-led1", "/sys/class/leds/user-led2", "/sys/class/leds/user-led3" }; /* Exit flag / volatile bool g_quit = false; / Short option names / static const char g_shortopts [] = ":n:vh"; / Option names / static const struct option g_longopts [] = { { "number", required_argument, NULL, 'n' }, { "version", no_argument, NULL, 'v' }, { "help", no_argument, NULL, 'h' }, { 0, 0, 0, 0 } }; static void usage(FILE fp, int argc, char argv) { fprintf(fp, "Usage: %s [options]nn" "Options:n" " -n \| --number Number of LEDs, range of 1 to 4 n" " -v \| --version Display version informationn" " -h \| --help Show help contentnn" "", basename(argv[0])); } static void opt_parsing_err_handle(int argc, char argv, int flag) { /* Exit if no input parameters are entered / int state = 0; if (argc < 2) { printf("No input parameters are entered, please check the input.n"); state = -1; } else { / Feedback Error parameter information then exit / if (optind < argc \|\| flag) { printf("Error: Parameter parsing failedn"); if (flag) printf("tunrecognized option '%s'n", argv[optind-1]); while (optind < argc) { printf("tunrecognized option '%s'n", argv[optind++]); } state = -1; } } if (state == -1) { printf("Tips: '-h' or '--help' to get helpnn"); exit(EXIT_FAILURE); } } 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}; / Parsing input parameters / while ((c = getopt_long(argc, argv, g_shortopts, g_longopts, NULL)) != -1) { switch (c) { case 'n': num = atoi(optarg); break; case 'v': / Display the version / printf("version : 1.0n"); exit(EXIT_SUCCESS); case 'h': usage(stdout, argc, argv); exit(EXIT_SUCCESS); default : flag = 1; break; } } opt_parsing_err_handle(argc, argv, flag); / Check if the number of LEDs is out of preset range / if ((num > ARRAY_SIZE(g_leds)) \|\| (num < 1)) { printf("Error: The number of LEDs entered exceeds the preset range(1-4)n"); exit(EXIT_FAILURE); } / Ctrl+c handler / signal(SIGINT, sig_handle); / Print LEDs / printf("nSystem leds :n"); system("find /sys/class/leds/"); printf("nFlashing leds :n"); for (i = 0; i < num; i++) printf("%sn",g_leds[i]); while (!g_quit) { /* Turn on LEDs / for (i = 0; i < num; i++) { / Set the LED brightness value to 1 to turn on the led / snprintf(cmd, 64, "echo 1 > %s/brightness", g_leds[i]); if (system(cmd) != 0) { fprintf(stderr, "Error: Failed to turn on %sn", g_leds[i]); exit(EXIT_FAILURE); } } / Keep the LEDs on for 500 ms / usleep(500 1000); /* Turn off LEDs / for (i = 0; i < num; i++) { / Set the LED brightness value to 0 to turn off the LED / snprintf(cmd, 64, "echo 0 > %s/brightness", g_leds[i]); if (system(cmd) != 0) { fprintf(stderr, "Error: Failed to turn off %sn", g_leds[i]); exit(EXIT_FAILURE); } } / Keep the LEDs off for 500 ms / usleep(500 1000); } printf("Exitn"); return 0; } 复制代码 makefile脚本 tl_led_flash:tl_led_flash.c $(CC) -Wall [ DISCUZ_CODE_3003 ]lt; -o $@ clean: rm -f tl_led_flash .o ~ install: cp tl_led_flash $(PREFIX) 复制代码 3、命令行下执行两条命令 source /home/tronlong/ti-processor-sdk-linux-rt-am335x-evm-04.03.00.05/linux-devkit/environment-setup 复制代码 make 复制代码就会生成一个文件 tl_led_flash 4、开发板eth0接好网线，获得的IP是 192.168.31.40 通过OpenSSH进行文件传输命令行命令 scp tl_led_flash root@192.168.31.40:/ 复制代码 5、这个时间，通过开发板串口进入开发板的命行，可以看见传递过来的文件，并能执行，让LED开始流水了演示视频链接：https://www.bilibili.com/video/BV1ZY411x7rn/ 0
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