【Rico Board试用体验】第十六篇☞rico board的uboot添加自定义命令iled，完成点灯操作。

2016-12-22 08:43:57 8558

0 参考common/cmd_gpio.c文件，完成了uboot下简单的点灯操作，开始准备控制ricoboard上的4个状态灯，发现不能控制，后来就尝试了别的引脚在GPIO0_2上面，实验成功了。在uboot的根目录common下新建文件cmd_iled.c。代码如下： /* * Control GPIO pins on the fly * * Copyright (c) 2008-2011 Analog Devices Inc. * * Licensed under the GPL-2 or later. / #include #include #include #ifndef name_to_gpio #define name_to_gpio(name) simple_strtoul(name, NULL, 10) #endif ulong led_num[4] = { 2, 3, 14, 15, }; static int do_iled(cmd_tbl_t cmdtp, int flag, int argc, char * const argv[]) { int num, status = 1; const char str_num, str_status; if (argc != 3) show_usage: return CMD_RET_USAGE; str_num = argv[1]; str_status = argv[2]; num = name_to_gpio(str_num); if (num < 0) goto show_usage; if (strcmp(str_status, "on") == 0) status = 0; else if (strcmp(str_status, "off") == 0) status = 1; else goto show_usage; if (gpio_request(led_num[num], "led_gpio")) { printf("led: requesting pin %d failedn", led_num[num]); return -1; } gpio_direction_output(led_num[num], status); gpio_set_value(led_num[num], !status); printf("led %d pin %d status is %dn", num, led_num[num], status); gpio_free(led_num[num]); return status; } U_BOOT_CMD(iled, 3, 0, do_iled, "light iled", " n" ); 复制代码修改common下的Makefile文件，添加cmd_iled.o编译选项。重新上电运行uboot如下: led效果: 还可以查看下iled命令帮助内容： 0
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