WhyCan Forum(哇酷开发者社区)

liefyuan

会员

注册时间： 2021-05-30

已发帖子： 69

积分： 95

V3s板子 LRADC KEY按键显示的键值错误，并且显示毫无规律，求教啊！

原理图：

硬件检查：
R24电阻按键不按下时电压为：2.98v

R24电阻S1按键按下时电压为：0.19v
R25电阻S2按键按下时电压为：0.39v
R26电阻S3按键按下时电压为：0.6v
R27电阻S4按键按下时电压为：0.8v

问题：
按键与键值显示错误。

设备树文件：

#include <dt-bindings/input/input.h>

#include "sun8i-v3s-licheepi-zero.dts"

/ {
        model = "Lichee Pi Zero with Dock";
        compatible = "licheepi,licheepi-zero-dock", "licheepi,licheepi-zero",
                     "allwinner,sun8i-v3s";
};

&codec {
        allwinner,audio-routing =
                "Headphone", "HP",
                "Headphone", "HPCOM",
                "MIC1", "Mic",
                "Mic",  "HBIAS";
        status = "okay";
};

&lradc {
        vref-supply = <&reg_vcc3v0>;
        status = "okay";

        button@200 {
                label = "Volume Up";
                linux,code = <KEY_VOLUMEUP>;
                channel = <0>;
                voltage = <200000>;
        };

        button@400 {
                label = "Volume Down";
                linux,code = <KEY_VOLUMEDOWN>;
                channel = <0>;
                voltage = <400000>;
        };

        button@600 {
                label = "Select";
                linux,code = <KEY_SELECT>;
                channel = <0>;
                voltage = <600000>;
        };
        button@800 {
                label = "Start";
                linux,code = <KEY_OK>;
                channel = <0>;
                voltage = <800000>;
        };
};

&mmc1 {
        pinctrl-0 = <&mmc1_pins>;
        pinctrl-names = "default";
        broken-cd;
        bus-width = <4>;
        vmmc-supply = <&reg_vcc3v3>;
        status = "okay";
};

测试代码：https://elinux.org/images/9/93/Evtest.c

以下我是按照原理图上的S1，S2，S3，S4按键的顺序按下的，输出的信息完全不对，求教。

# ./evtest /dev/input/event0
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100
Input device name: "1c22800.lradc"
Supported events:
  Event type 0 (Sync)
  Event type 1 (Key)
    Event code 114 (VolumeDown)
    Event code 115 (VolumeUp)
    Event code 352 (Ok)
    Event code 353 (Select)
Testing ... (interrupt to exit)
Event: time 17480.008424, type 1 (Key), code 114 (VolumeDown), value 1
Event: time 17480.008424, -------------- Report Sync ------------
Event: time 17480.246700, type 1 (Key), code 114 (VolumeDown), value 0
Event: time 17480.246700, -------------- Report Sync ------------
Event: time 17480.727180, type 1 (Key), code 352 (Ok), value 1
Event: time 17480.727180, -------------- Report Sync ------------
Event: time 17480.942028, type 1 (Key), code 352 (Ok), value 0
Event: time 17480.942028, -------------- Report Sync ------------
Event: time 17481.465484, type 1 (Key), code 352 (Ok), value 1
Event: time 17481.465484, -------------- Report Sync ------------
Event: time 17481.680335, type 1 (Key), code 352 (Ok), value 0
Event: time 17481.680335, -------------- Report Sync ------------
Event: time 17482.195977, type 1 (Key), code 352 (Ok), value 1
Event: time 17482.195977, -------------- Report Sync ------------
Event: time 17482.445982, type 1 (Key), code 352 (Ok), value 0
Event: time 17482.445982, -------------- Report Sync ------------

我按下S1按键再松开：

Event: time 17480.008424, type 1 (Key), code 114 (VolumeDown), value 1
Event: time 17480.008424, -------------- Report Sync ------------
Event: time 17480.246700, type 1 (Key), code 114 (VolumeDown), value 0
Event: time 17480.246700, -------------- Report Sync ------------

如上它显示的是S2按键（VolumeDown）的信息和键值，为什么呢？

我按下S2、S3、S4键都是显示的是S4按键（KEY_OK）的信息，为什么呢？

Event: time 17480.727180, type 1 (Key), code 352 (Ok), value 1
Event: time 17480.727180, -------------- Report Sync ------------
Event: time 17480.942028, type 1 (Key), code 352 (Ok), value 0
Event: time 17480.942028, -------------- Report Sync ------------

查看中断列表：

# cat /proc/interrupts
           CPU0
 19:        576     GIC-0  27 Level     arch_timer
 21:          0     GIC-0  50 Level     sun4i_timer0
 22:          0     GIC-0  82 Level     1c02000.dma-controller
 23:       5039     GIC-0  92 Level     sunxi-mmc
 24:        159     GIC-0  93 Level     sunxi-mmc
 25:          1     GIC-0 103 Level     musb-hdrc.1.auto
 26:          0     GIC-0  72 Level     1c20400.rtc
 32:          2     GIC-0  62 Level     sun4i-a10-lradc-keys
 34:        226     GIC-0  32 Level     serial
 35:         63     GIC-0  38 Level     mv64xxx_i2c
IPI0:          0  CPU wakeup interrupts
IPI1:          0  Timer broadcast interrupts
IPI2:          0  Rescheduling interrupts
IPI3:          0  Function call interrupts
IPI4:          0  CPU stop interrupts
IPI5:          0  IRQ work interrupts
IPI6:          0  completion interrupts
Err:          0

有中断：

 32:          2     GIC-0  62 Level     sun4i-a10-lradc-keys

以上就是所有的信息