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07_key.md

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key

0.

1. lsls

KEY0 接了一个 10K 的上拉电阻，因此 KEY0 没有按下的时候 PG3 应该是 高电平，当 KEY0 按下以后 PG3 就是低电平。

在根节点“/”下创建 KEY 节点，节点名为“key”，节点内容如下

1 key { 2 compatible = "alientek,key"; 3 status = "okay"; 4 key-gpio = <&gpiog 3 GPIO_ACTIVE_LOW>; 5 };

atomic_t keyvalue; /* 按键值 */

/* 打开 key 驱动 / 44 fd = open(filename, O_RDWR); 45 if(fd < 0){ 46 printf("file %s open failed!\r\n", argv[1]); 47 return -1; 48 } 49 50 / 循环读取按键值数据！ / 51 while(1) { 52 read(fd, &keyvalue, sizeof(keyvalue)); 53 if (keyvalue == KEY0VALUE) { / KEY0 / 54 printf("KEY0 Press, value = %#X\r\n", keyvalue);/ 按下 */ 55 } 56 }

/* IMX6ULL */
pinctrl key: keygrp{
        fsl,pins =<
                MX6UL_PAD_UARTI_CTS_B_GPIO1_IO18_0xF080
        >;
}
key{
        compatible = "alientek,key";
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl key>;
        key-gpios = <&gpi01 18 GPIO ACTIVE HIGH>;
        status ="okay";
}