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[solved] 18F47J53 dual USB mode : uart /hid
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spilz



Joined: 30 Jan 2012
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[solved] 18F47J53 dual USB mode : uart /hid
PostPosted: Sun Nov 26, 2017 9:41 am     Reply with quote

Hello

I would like to know if there is a way to switch the USB mode from hid to uart and from uart to hid.
I use uart as debug, but now I need to use the USB port as hid keyboard, but still want to be able to use uart for debug when needed.
A solution with a selection on start is ok for my use (if a jumper is set on startup -> uart, else -> hid).

Someone know how to do or if it's not possible ?

Thanks for your help.

Regards


Last edited by spilz on Tue Nov 28, 2017 3:01 am; edited 1 time in total
Ttelmah



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PostPosted: Sun Nov 26, 2017 11:28 am     Reply with quote

I'd setup the device in dual mode (composite).
There is nothing to stop you setting the device up in composite mode, so it is both a HID and CDC device.
There is a kb/mouse example composite device supplied with the compiler.
spilz



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PostPosted: Sun Nov 26, 2017 12:42 pm     Reply with quote

Thanks for your reply

I thought it was not possible, so it's a very good news if I can do it Smile
Actually I tried to do it with the example kb/mouse but I thought it was possible only because both are hid, i don't see where I composite mode is set.
Ttelmah



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PostPosted: Sun Nov 26, 2017 1:29 pm     Reply with quote

You would need to take a composite descriptor, like the one here:
<https://bitbucket.org/sparkbuzz/pic32_usb.x/src>

and put the CDC and HID values your device wants in place of the values used.

The example shows how you talk to the endpoints.
spilz



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PostPosted: Sun Nov 26, 2017 1:39 pm     Reply with quote

I saw an other exemple file which seems doing exactly what I need : ex_usb_hid_and_cdc.c
I'm able to compile, but only uart work, hid seems not working :(
I maybe miss understand Something and what hid should do on this exemple...
Ttelmah



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PostPosted: Sun Nov 26, 2017 2:23 pm     Reply with quote

The HID in that example just sends the ADC value as an output, and operates three LED's from the value received.
spilz



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PostPosted: Sun Nov 26, 2017 2:28 pm     Reply with quote

ho I see,
I thought it act as a keyboard :(

I tried to change the my_hid_demo(void) function by a KB function, but it doesn't work.

I guess the solution is the composite descriptor you talk about but I don't know enough USB to understand it :(
spilz



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PostPosted: Sun Nov 26, 2017 3:09 pm     Reply with quote

I don't really understand why usb_desc_key_cdc.h doesn't work as descriptor :(
spilz



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PostPosted: Sun Nov 26, 2017 4:39 pm     Reply with quote

I found an example I didn't see before : ex_usb_keyboard_and_cdc.c

It does exactly what I need Smile

It works alone, but when I try to add it on my personal project, keyboard seems never be released, I can change the key pressed, but can't release it :(

Any idea what can do it ? or solve it ?

regards
Ttelmah



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PostPosted: Mon Nov 27, 2017 1:44 am     Reply with quote

You do understand how a keyboard works in Windows?.

Note how the keyboard_task in the example puts the packet, even if there is no character to send.
spilz



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PostPosted: Mon Nov 27, 2017 2:35 am     Reply with quote

If I understand right, the HID should send the key which are pressed, if no key are pressed, it should send only null value.

In my personal code, I try to ask only one time keyboard_task but the key stays like pressed.

I tried to call an other time keyboard_task with only null value, but doesn't solve the issue :(
Ttelmah



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PostPosted: Mon Nov 27, 2017 4:16 am     Reply with quote

You need to send three null bytes, not just a single null.

The packet sent has the modifier keys, then the padding, and finally the key array. Both the modifier key value, and the key array have to be 0 to say everything has released, so a three byte packet.
So
tx_msg[2]=0;
tx_msg[0]=0;
Then the usb_put_packet.
spilz



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PostPosted: Mon Nov 27, 2017 3:49 pm     Reply with quote

Ok, I found my mistake:
I sent the second usb_put_packet with null values too fast, adding delay_ms(10) solve the issue Smile

Now I need to understand how I can do several keys pressed:

LeftShift + LeftWindows + LeftAlt + 'b'

But I don't know where to find the value of each key.

For LeftShift + LeftAlt + 'b' , I tried to send HID values:
Code:

tx_msg[0]=0;
tx_msg[1]=0;
tx_msg[2]=5;    // for 'b'
tx_msg[3]=2;    // for LeftShift  ??
tx_msg[4]=4;    // for LeftAlt     ??
tx_msg[5]=0;
tx_msg[6]=0;


(I didn't find LeftWindows value).

But it doesn't work :(
Ttelmah



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PostPosted: Tue Nov 28, 2017 2:27 am     Reply with quote

The shift keys are the key 'modifiers'. Byte 0 in the transmission.
Code:

typedef enum
{
   KB_MODIFIER_LEFT_CTRL = 1,
   KB_MODIFIER_LEFT_SHIFT = 2,
   KB_MODIFIER_LEFT_ALT = 4,
   KB_MODIFIER_LEFT_GUI = 8,
   KB_MODIFIER_RIGHT_CTRL = 16,
   KB_MODIFIER_RIGHT_SHIFT = 32,
   KB_MODIFIER_RIGHT_ALT = 64,
   KB_MODIFIER_RIGHT_GUI = 128
} kb_modifier_t;

The 'Windows' key is the GUI define.
So KB_MODIFIER_LEFT_SHIFT | KB_MODIFIER_LEFT_GUI | KB_MODIFIER_LEFT_ALT, sent in 'modifier'.
spilz



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PostPosted: Tue Nov 28, 2017 3:00 am     Reply with quote

Thank you Ttelmah, it works now Smile
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