nRF5 SDK 15 HID Keyboard example Endpoint transfer types?

[Precipheral]

How to select endpoint transfer type in hid keyboard example?

I am using nRF5 v15 with a nRF52832 and Soft Device s132 and the reports keep being sent as a bulk transfer rather than an interrupt, I can't seem to change it.

Cheers, Ash

[Kenneth]

Hi,

Why do you believe it's using bulk transfer and not interrupt?

Both mouse and keyboard endpoints are setup with transfertype interrupt. To send mouse reports more frequently you may change:

/**
* @brief Mouse move repeat time in milliseconds
*/
#define CONFIG_MOUSE_MOVE_TIME_MS (1) // Instead of 5ms

Best regards,
Kenneth

GetDescriptor (Configuration)

Configuration descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	9	0x09	00001001
bDescriptorType	CONFIGURATION	2	0x02	00000010
wTotalLength	59 bytes	59	0x003B	00000000 00111011
bNumInterface	2	2	0x02	00000010
bConfigurationValue	1	1	0x01	00000001
iConfiguration	4	4	0x04	00000100
bmAttributes. Reserved	Zero	0	0x00	00000
bmAttributes. RemoteWakeup	Supported	1	0x1	1
bmAttributes. SelfPowered	Yes	1	0x1	1
bmAttributes. Reserved7	One	1	0x1	1
bMaxPower	500 mA	250	0xFA	11111010

Interface descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	9	0x09	00001001
bDescriptorType	INTERFACE	4	0x04	00000100
bInterfaceNumber	0	0	0x00	00000000
bAlternateSetting	0	0	0x00	00000000
bNumEndpoints	1	1	0x01	00000001
bInterfaceClass	Human Interface Device (Find out more online)	3	0x03	00000011
bInterfaceSubClass	Boot Interface	1	0x01	00000001
bInterfaceProtocol	Mouse	2	0x02	00000010
iInterface	0	0	0x00	00000000

Unknown descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	9	0x09	00001001
bDescriptorType	Class: 0x21	33	0x21	00100001
Remaining descriptor data	7 bytes

Endpoint descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	7	0x07	00000111
bDescriptorType	ENDPOINT	5	0x05	00000101
bEndpointAddress	1 IN	129	0x81	10000001
bmAttributes. TransferType	Interrupt	3	0x3	11
bmAttributes. Reserved	Zero	0	0x00	000000
wMaxPacketSize	64 bytes	64	0x0040	00000000 01000000
bInterval	1 frame (1000 us)	1	0x01	00000001

Interface descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	9	0x09	00001001
bDescriptorType	INTERFACE	4	0x04	00000100
bInterfaceNumber	1	1	0x01	00000001
bAlternateSetting	0	0	0x00	00000000
bNumEndpoints	1	1	0x01	00000001
bInterfaceClass	Human Interface Device (Find out more online)	3	0x03	00000011
bInterfaceSubClass	Boot Interface	1	0x01	00000001
bInterfaceProtocol	Keyboard	1	0x01	00000001
iInterface	0	0	0x00	00000000

Unknown descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	9	0x09	00001001
bDescriptorType	Class: 0x21	33	0x21	00100001
Remaining descriptor data	7 bytes

Endpoint descriptor
Name	Value	Dec	Hex	Bin
bLength	Valid	7	0x07	00000111
bDescriptorType	ENDPOINT	5	0x05	00000101
bEndpointAddress	2 IN	130	0x82	10000010
bmAttributes. TransferType	Interrupt	3	0x3	11
bmAttributes. Reserved	Zero	0	0x00	000000
wMaxPacketSize	64 bytes	64	0x0040	00000000 01000000
bInterval	1 frame (1000 us)	1	0x01	00000001

[Precipheral]

I thought it was Bulk because that is what wire shark is reporting, I'm still newish to packet sniffing and aware that they don't / can't always get the results perfectly right. After looking back it seems that wire shark is misreporting it.

Thank you for the tables, where / how did you get them?

Does p_hids contain all of the device and report descriptors?

Where specifically are the device Endpoint descriptors parameters in main.c or ble_hids.c ?

Thank you for your help.

[Kenneth]

Hi,

This was a dump from the ellisys usb sniffer using the \usbd_hid_composite example from sdk v15.2. 

You can refer to the usbd library documentation on usage:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_usbd.html?cp=4_0_0_3_59 

Best regards,
Kenneth

[Precipheral]

The USBD drives appears to not be supported for nRF52832, how does the keyboard work if the USBD driver isn't supported/used?

[Kenneth]

I was thinking of nRF52840 yes, the nRF52832 does not have USB.

Best regards,
Kenneth

[Precipheral]

Ok, Thank you,I think I figured it out.

It looks like the encoded report is in ble_hids.c, functions rep_char_add and rep_map_char_add seem to do most of the heavy lifting and the functions used within them encode and then send the report.

Cheers, Ash.