6254使用按键gpio

2024-6-29 15:20| 发布者: 87岁拄拐上分| 查看: 69| 评论: 0

类目： AM6254系列产品 > linux 文档编号: 1445

1.引脚配置

mcu_gpio_key_pin_default: mcu-gpio-key-pin-default {

pinctrl-single,pins = <

AM62X_MCU_IOPAD(0x040, PIN_INPUT, 7) /* (D4) MCU_GPIO0_16 */

};

2.节点配置

gpio-keys1 {

compatible = "gpio-keys";

autorepeat;

pinctrl-names = "default";

pinctrl-0 = <&mcu_gpio_key_pin_default>;

key-mcu16 {

interrupt-parent = <&mcu_gpio0>;

label = "GPIO Key UP";

linux,code = <30>;

gpios = <&mcu_gpio0 16 GPIO_ACTIVE_LOW>;

interrupts = <16 IRQ_TYPE_EDGE_RISING>;

};

3.编译内核替换设备树

4.查看是否生成节点

root@OK62xx:/# cat sys/kernel/debug/gpio

gpiochip0: GPIOs 0-23, parent: platform/4201000.gpio, 4201000.gpio:

gpio-16 ( |GPIO Key UP ) in hi ACTIVE LOW

5evtest测试

root@OK62xx:/# evtest /dev/input/by-path/platform-gpio-keys1-event

//按下是1，松开是0，长按是2

Event: time 1719645537.990880, type 1 (EV_KEY), code 30 (KEY_A), value 1

Event: time 1719645537.990880, -------------- SYN_REPORT ------------

Event: time 1719645538.172304, type 1 (EV_KEY), code 30 (KEY_A), value 0

Event: time 1719645538.172304, -------------- SYN_REPORT ------------

Event: time 1719645558.377843, type 1 (EV_KEY), code 30 (KEY_A), value 1

Event: time 1719645558.377843, -------------- SYN_REPORT ------------

Event: time 1719645558.649860, type 1 (EV_KEY), code 30 (KEY_A), value 2

Event: time 1719645558.649860, -------------- SYN_REPORT ------------

Event: time 1719645558.689855, type 1 (EV_KEY), code 30 (KEY_A), value 2

Event: time 1719645558.689855, -------------- SYN_REPORT ------------

Event: time 1719645558.729848, type 1 (EV_KEY), code 30 (KEY_A), value 2

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