Linux/AM5728: am5728 button use

abayyy

Part Number: AM5728

Tool/software: Linux

hello every one:

my SDK is ti-processor-sdk-linux-arm57xx-evm-03.01.00.06 under the ubuntu14.04 . I want to use the button to but I do not know how to use them.

eg. I want to use one button to camera ,the other one to Audio.

Can you help me? Thanks.

please give me some advise

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi,

Are you referring to the user inputs (user1, user2, ..., user5) buttons?

Those are GPIO keys:

USER1 {
label = "Up";
linux,code = <KEY_UP>;
gpios = <&gpio2 23 GPIO_ACTIVE_LOW>;
};

USER2 {
label = "Down";
linux,code = <KEY_DOWN>;
gpios = <&gpio2 25 GPIO_ACTIVE_LOW>;
};

USER3 {
label = "Left";
linux,code = <KEY_LEFT>;
gpios = <&gpio2 28 GPIO_ACTIVE_LOW>;
};

USER4 {
label = "Right";
linux,code = <KEY_RIGHT>;
gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
};

USER5 {
label = "Home";
linux,code = <KEY_HOME>;
gpios = <&gpio2 20 GPIO_ACTIVE_LOW>;
};

They are not meant to be used for controlling camera or audio.

Best Regards,
Yordan

0 abayyy over 8 years ago in reply to Yordan Kovachev

Intellectual 300 points

hello:
Where is the introduction of the key? I can use the command evtest /dev/input/event0
when I push the key ,those are the outputs:

root@am57xx-evm:/dev/input# 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: "gpio_keys"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 102 (KEY_HOME)
Event code 103 (KEY_UP)
Event code 105 (KEY_LEFT)
Event code 106 (KEY_RIGHT)
Event code 108 (KEY_DOWN)
Key repeat handling:
Repeat type 20 (EV_REP)
Repeat code 0 (REP_DELAY)
Value 250
Repeat code 1 (REP_PERIOD)
Value 33
Properties:
Testing ... (interrupt to exit)

Event: time 1482994423.201647, type 1 (EV_KEY), code 103 (KEY_UP), value 1
Event: time 1482994423.201647, -------------- SYN_REPORT ------------
Event: time 1482994423.375885, type 1 (EV_KEY), code 103 (KEY_UP), value 0
Event: time 1482994423.375885, -------------- SYN_REPORT ------------

Event: time 1482994439.747535, type 1 (EV_KEY), code 108 (KEY_DOWN), value 1
Event: time 1482994439.747535, -------------- SYN_REPORT ------------
Event: time 1482994439.944338, type 1 (EV_KEY), code 108 (KEY_DOWN), value 0
Event: time 1482994439.944338, -------------- SYN_REPORT ------------

Event: time 1482994455.631321, type 1 (EV_KEY), code 105 (KEY_LEFT), value 1
Event: time 1482994455.631321, -------------- SYN_REPORT ------------
Event: time 1482994455.801045, type 1 (EV_KEY), code 105 (KEY_LEFT), value 0
Event: time 1482994455.801045, -------------- SYN_REPORT ------------

Event: time 1482994471.551553, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 1
Event: time 1482994471.551553, -------------- SYN_REPORT ------------
Event: time 1482994471.719824, type 1 (EV_KEY), code 106 (KEY_RIGHT), value 0
Event: time 1482994471.719824, -------------- SYN_REPORT ------------

Event: time 1482994488.064901, type 1 (EV_KEY), code 102 (KEY_HOME), value 1
Event: time 1482994488.064901, -------------- SYN_REPORT ------------
Event: time 1482994488.243961, type 1 (EV_KEY), code 102 (KEY_HOME), value 0
Event: time 1482994488.243961, -------------- SYN_REPORT ------------

What should I do if I want to use a key to generate an interrupt and start the camera in the interrupt?

0 abayyy over 8 years ago in reply to Yordan Kovachev

Intellectual 300 points

Hello:

Where can I get the user inputs buttons reference?
Thanks.

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Linux/AM5728: am5728 button use