Akash Naidu
Reputation: 1
USB touch screen HID descriptor for 2 contact identifier
Currently i am working on USB touch screen HID descriptors(custom HID descriptor),on STM32f4 board. For that, I have implemented a HID descriptor for single contact identifier(single finger touch) and which is working for me.But, my requirement is for Multi touch finger. So, i am modifying my single touch finger HID to multi touch HID.In this case,i have added some report for 2nd finger.
This is my Report descriptor for 2 fingers...
0x05, 0x0D, // Usage Page (Digitizer)
0x09, 0x04, // Usage (Touch Screen)
0xA1, 0x01, // Collection (Application)
0x09, 0x55, // Usage (0x55)
0x25, 0x03, // Logical Maximum (3)
0xB1, 0x02, // Feature (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0x09, 0x54, // Usage (0x54)
0x95, 0x01, // Report Count (1)
0x75, 0x08, // Report Size (8)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x22, // Usage (Finger)
0xA1, 0x02, // Collection (Logical)
0x09, 0x51, // Usage (0x51)
0x75, 0x08, // Report Size (8)
0x95, 0x01, // Report Count (1)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x42, // Usage (Tip Switch)
0x09, 0x32, // Usage (In Range)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x75, 0x01, // Report Size (1)
0x95, 0x02, // Report Count (2)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x06, // Report Count (6)
0x81, 0x03, // Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x30, // Usage (X)
0x09, 0x31, // Usage (Y)
0x16, 0x00, 0x00, // Logical Minimum (0)
0x26, 0x10, 0x27, // Logical Maximum (10000)
0x36, 0x00, 0x00, // Physical Minimum (0)
0x46, 0x10, 0x27, // Physical Maximum (10000)
0x66, 0x00, 0x00, // Unit (None)
0x75, 0x10, // Report Size (16)
0x95, 0x02, // Report Count (2)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0, // End Collection
0x05, 0x0D, // Usage Page (Digitizer)
0x09, 0x22, // Usage (Finger)
0xA1, 0x02, // Collection (Logical)
0x05, 0x0D, // Usage Page (Digitizer)
0x09, 0x51, // Usage (0x51)
0x75, 0x08, // Report Size (8)
0x95, 0x01, // Report Count (1)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x42, // Usage (Tip Switch)
0x09, 0x32, // Usage (In Range)
0x15, 0x00, // Logical Minimum (0)
0x25, 0x01, // Logical Maximum (1)
0x75, 0x01, // Report Size (1)
0x95, 0x02, // Report Count (2)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x06, // Report Count (6)
0x81, 0x03, // Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
0x09, 0x30, // Usage (X)
0x09, 0x31, // Usage (Y)
0x16, 0x00, 0x00, // Logical Minimum (0)
0x26, 0x10, 0x27, // Logical Maximum (10000)
0x66, 0x00, 0x00, // Unit (None)
0x75, 0x10, // Report Size (16)
0x95, 0x02, // Report Count (2)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0, // End Collection
0xC0, // End Collection
I am testing this in windows 10 touch lapy,where i have USBlyzer to analyse the data which sending from board to PC.
In the analyzer i am getting like this..
in the analysis, it shows the same data for finger 1,2, even though i am sending different data.
Here i am attaching how i m sending data..
my_buff[0] = 0x02; // contact count
my_buff[1] = 0x01; // contact identifier(finger1)
my_buff[2] = 0x03; // tip switch and in range
my_buff[3] = 0x88; // x axis lsb
my_buff[4] = 0x13; // x axis msb
my_buff[5] = 0x88; // y axis lsb
my_buff[6] = 0x13; // y axis msb
my_buff[7] = 0x02; // contact identifier(finger2)
my_buff[8] = 0x03; // tip switch and in range
my_buff[9] = 0x70; // x axis lsb
my_buff[10] = 0x12; // x axis msb
my_buff[11] = 0x70; // y axis lsb
my_buff[12] = 0x12; // y axis msb
USBD_HID_SendReport (&USB_OTG_dev,
my_buff,
13);
In this case i am not getting even single touch.But, if i disable tip switch in finger 2 then finger 1 touch is working.
But if i disable finger 1 tip switch, and enable finger 2 tip switch then even i am not getting single touch.
so,please help me where i went wrong.
i don't know whether problem is because of report Descriptor or some other thing..
thank you
Upvotes: 0
Views: 5201
Answers (1)
aja
Reputation: 1720
There are a number of things not quite right with the report descriptor which could confuse the host HID parser (or cause different behaviour across host operating systems), so I would recommend fixing those first including:
- an empty Feature report definition (this could be the real problem)
- logical minimum not specified
- report size too small to accommodate logical maximum value
- forgetting to reset physical units before defining subsequent fields (you can use PUSH and POP for that)
The report descriptor as it stands would be parsed as:
//--------------------------------------------------------------------------------
// Decoded Application Collection
//--------------------------------------------------------------------------------
/*
05 0D (GLOBAL) USAGE_PAGE 0x000D Digitizer Device Page
09 04 (LOCAL) USAGE 0x000D0004 Touch Screen (Application Collection)
A1 01 (MAIN) COLLECTION 0x01 Application (Usage=0x000D0004: Page=Digitizer Device Page, Usage=Touch Screen, Type=Application Collection)
09 55 (LOCAL) USAGE 0x000D0055 Contact Count Maximum (Static Value)
25 03 (GLOBAL) LOGICAL_MAXIMUM 0x03 (3)
B1 02 (MAIN) FEATURE 0x00000002 ( fields x bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap <-- Error: REPORT_SIZE is undefined <-- Error: REPORT_COUNT is undefined <-- Error: LOGICAL_MINIMUM is undefined
09 54 (LOCAL) USAGE 0x000D0054 Contact Count (Dynamic Value)
95 01 (GLOBAL) REPORT_COUNT 0x01 (1) Number of fields
75 08 (GLOBAL) REPORT_SIZE 0x08 (8) Number of bits per field
81 02 (MAIN) INPUT 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap <-- Error: LOGICAL_MINIMUM is undefined
09 22 (LOCAL) USAGE 0x000D0022 Finger (Logical Collection)
A1 02 (MAIN) COLLECTION 0x02 Logical (Usage=0x000D0022: Page=Digitizer Device Page, Usage=Finger, Type=Logical Collection)
09 51 (LOCAL) USAGE 0x000D0051 Contact Identifier (Dynamic Value)
75 08 (GLOBAL) REPORT_SIZE 0x08 (8) Number of bits per field <-- Redundant: REPORT_SIZE is already 8
95 01 (GLOBAL) REPORT_COUNT 0x01 (1) Number of fields <-- Redundant: REPORT_COUNT is already 1
81 02 (MAIN) INPUT 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap <-- Error: LOGICAL_MINIMUM is undefined
09 42 (LOCAL) USAGE 0x000D0042 Tip Switch (Momentary Control)
09 32 (LOCAL) USAGE 0x000D0032 In Range (Momentary Control)
15 00 (GLOBAL) LOGICAL_MINIMUM 0x00 (0) <-- Info: Consider replacing 15 00 with 14
25 01 (GLOBAL) LOGICAL_MAXIMUM 0x01 (1)
75 01 (GLOBAL) REPORT_SIZE 0x01 (1) Number of bits per field
95 02 (GLOBAL) REPORT_COUNT 0x02 (2) Number of fields
81 02 (MAIN) INPUT 0x00000002 (2 fields x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
95 06 (GLOBAL) REPORT_COUNT 0x06 (6) Number of fields
81 03 (MAIN) INPUT 0x00000003 (6 fields x 1 bit) 1=Constant 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
05 01 (GLOBAL) USAGE_PAGE 0x0001 Generic Desktop Page
09 30 (LOCAL) USAGE 0x00010030 X (Dynamic Value)
09 31 (LOCAL) USAGE 0x00010031 Y (Dynamic Value)
16 0000 (GLOBAL) LOGICAL_MINIMUM 0x0000 (0) <-- Redundant: LOGICAL_MINIMUM is already 0 <-- Info: Consider replacing 16 0000 with 14
26 1027 (GLOBAL) LOGICAL_MAXIMUM 0x2710 (10000)
36 0000 (GLOBAL) PHYSICAL_MINIMUM 0x0000 (0) <-- Info: Consider replacing 36 0000 with 34
46 1027 (GLOBAL) PHYSICAL_MAXIMUM 0x2710 (10000)
66 0000 (GLOBAL) UNIT 0x0000 No unit (0=None) <-- Redundant: UNIT is already 0x00000000 <-- Info: Consider replacing 66 0000 with 64
75 10 (GLOBAL) REPORT_SIZE 0x10 (16) Number of bits per field
95 02 (GLOBAL) REPORT_COUNT 0x02 (2) Number of fields
81 02 (MAIN) INPUT 0x00000002 (2 fields x 16 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
C0 (MAIN) END_COLLECTION Logical <-- Warning: Physical units are still in effect PHYSICAL(MIN=0,MAX=10000) UNIT(0x,EXP=0)
05 0D (GLOBAL) USAGE_PAGE 0x000D Digitizer Device Page
09 22 (LOCAL) USAGE 0x000D0022 Finger (Logical Collection)
A1 02 (MAIN) COLLECTION 0x02 Logical (Usage=0x000D0022: Page=Digitizer Device Page, Usage=Finger, Type=Logical Collection)
05 0D (GLOBAL) USAGE_PAGE 0x000D Digitizer Device Page <-- Redundant: USAGE_PAGE is already 0x000D
09 51 (LOCAL) USAGE 0x000D0051 Contact Identifier (Dynamic Value)
75 08 (GLOBAL) REPORT_SIZE 0x08 (8) Number of bits per field
95 01 (GLOBAL) REPORT_COUNT 0x01 (1) Number of fields
81 02 (MAIN) INPUT 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap <-- Error: REPORT_SIZE (8) is too small for LOGICAL_MAXIMUM (10000) which needs 14 bits.
09 42 (LOCAL) USAGE 0x000D0042 Tip Switch (Momentary Control)
09 32 (LOCAL) USAGE 0x000D0032 In Range (Momentary Control)
15 00 (GLOBAL) LOGICAL_MINIMUM 0x00 (0) <-- Redundant: LOGICAL_MINIMUM is already 0 <-- Info: Consider replacing 15 00 with 14
25 01 (GLOBAL) LOGICAL_MAXIMUM 0x01 (1)
75 01 (GLOBAL) REPORT_SIZE 0x01 (1) Number of bits per field
95 02 (GLOBAL) REPORT_COUNT 0x02 (2) Number of fields
81 02 (MAIN) INPUT 0x00000002 (2 fields x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
95 06 (GLOBAL) REPORT_COUNT 0x06 (6) Number of fields
81 03 (MAIN) INPUT 0x00000003 (6 fields x 1 bit) 1=Constant 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
05 01 (GLOBAL) USAGE_PAGE 0x0001 Generic Desktop Page
09 30 (LOCAL) USAGE 0x00010030 X (Dynamic Value)
09 31 (LOCAL) USAGE 0x00010031 Y (Dynamic Value)
16 0000 (GLOBAL) LOGICAL_MINIMUM 0x0000 (0) <-- Redundant: LOGICAL_MINIMUM is already 0 <-- Info: Consider replacing 16 0000 with 14
26 1027 (GLOBAL) LOGICAL_MAXIMUM 0x2710 (10000)
66 0000 (GLOBAL) UNIT 0x0000 No unit (0=None) <-- Redundant: UNIT is already 0x00000000 <-- Info: Consider replacing 66 0000 with 64
75 10 (GLOBAL) REPORT_SIZE 0x10 (16) Number of bits per field
95 02 (GLOBAL) REPORT_COUNT 0x02 (2) Number of fields
81 02 (MAIN) INPUT 0x00000002 (2 fields x 16 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
C0 (MAIN) END_COLLECTION Logical <-- Warning: Physical units are still in effect PHYSICAL(MIN=0,MAX=10000) UNIT(0x,EXP=0)
C0 (MAIN) END_COLLECTION Application <-- Warning: Physical units are still in effect PHYSICAL(MIN=0,MAX=10000) UNIT(0x,EXP=0)
*/
//--------------------------------------------------------------------------------
// Digitizer Device Page featureReport (Device <-> Host)
//--------------------------------------------------------------------------------
typedef struct
{
// No REPORT ID byte
// Collection: TouchScreen
// Usage 0x000D0055 Contact Count Maximum, Value = to 3 <-- Ignored: REPORT_COUNT () is too small
} featureReport_t;
//--------------------------------------------------------------------------------
// Digitizer Device Page inputReport (Device --> Host)
//--------------------------------------------------------------------------------
typedef struct
{
// No REPORT ID byte
// Collection: TouchScreen
int8_t DIG_TouchScreenContactCount; // Usage 0x000D0054: Contact Count, Value = to 3
// Collection: TouchScreen Finger
int8_t DIG_TouchScreenFingerContactIdentifier; // Usage 0x000D0051: Contact Identifier, Value = to 3
uint8_t DIG_TouchScreenFingerTipSwitch : 1; // Usage 0x000D0042: Tip Switch, Value = 0 to 1
uint8_t DIG_TouchScreenFingerInRange : 1; // Usage 0x000D0032: In Range, Value = 0 to 1
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint16_t GD_TouchScreenFingerX; // Usage 0x00010030: X, Value = 0 to 10000, Physical = Value
uint16_t GD_TouchScreenFingerY; // Usage 0x00010031: Y, Value = 0 to 10000, Physical = Value
uint8_t DIG_TouchScreenFingerContactIdentifier_1; // Usage 0x000D0051: Contact Identifier, Value = 0 to 10000, Physical = Value
uint8_t DIG_TouchScreenFingerTipSwitch_1 : 1; // Usage 0x000D0042: Tip Switch, Value = 0 to 1, Physical = Value x 10000
uint8_t DIG_TouchScreenFingerInRange_1 : 1; // Usage 0x000D0032: In Range, Value = 0 to 1, Physical = Value x 10000
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint16_t GD_TouchScreenFingerX_1; // Usage 0x00010030: X, Value = 0 to 10000, Physical = Value
uint16_t GD_TouchScreenFingerY_1; // Usage 0x00010031: Y, Value = 0 to 10000, Physical = Value
} inputReport_t;
Here is another multi-touch report descriptor (using report ids) which may be worth experimenting with:
//--------------------------------------------------------------------------------
// Decoded Application Collection
//--------------------------------------------------------------------------------
/*
05 0D (GLOBAL) USAGE_PAGE 0x000D Digitizer Device Page
09 04 (LOCAL) USAGE 0x000D0004 Touch Screen (Application Collection)
A1 01 (MAIN) COLLECTION 0x01 Application (Usage=0x000D0004: Page=Digitizer Device Page, Usage=Touch Screen, Type=Application Collection)
85 54 (GLOBAL) REPORT_ID 0x54 (84) 'T'
09 22 (LOCAL) USAGE 0x000D0022 Finger (Logical Collection)
A1 02 (MAIN) COLLECTION 0x02 Logical (Usage=0x000D0022: Page=Digitizer Device Page, Usage=Finger, Type=Logical Collection)
09 42 (LOCAL) USAGE 0x000D0042 Tip Switch (Momentary Control)
14 (GLOBAL) LOGICAL_MINIMUM (0)
25 01 (GLOBAL) LOGICAL_MAXIMUM 0x01 (1)
75 01 (GLOBAL) REPORT_SIZE 0x01 (1) Number of bits per field
95 01 (GLOBAL) REPORT_COUNT 0x01 (1) Number of fields
81 02 (MAIN) INPUT 0x00000002 (1 field x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 32 (LOCAL) USAGE 0x000D0032 In Range (Momentary Control)
81 02 (MAIN) INPUT 0x00000002 (1 field x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 47 (LOCAL) USAGE 0x000D0047 Confidence (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
95 05 (GLOBAL) REPORT_COUNT 0x05 (5) Number of fields
81 03 (MAIN) INPUT 0x00000003 (5 fields x 1 bit) 1=Constant 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
75 08 (GLOBAL) REPORT_SIZE 0x08 (8) Number of bits per field
09 51 (LOCAL) USAGE 0x000D0051 Contact Identifier (Dynamic Value)
95 01 (GLOBAL) REPORT_COUNT 0x01 (1) Number of fields
81 02 (MAIN) INPUT 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
05 01 (GLOBAL) USAGE_PAGE 0x0001 Generic Desktop Page
26 FF7F (GLOBAL) LOGICAL_MAXIMUM 0x7FFF (32767)
75 10 (GLOBAL) REPORT_SIZE 0x10 (16) Number of bits per field
09 30 (LOCAL) USAGE 0x00010030 X (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 16 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 31 (LOCAL) USAGE 0x00010031 Y (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 16 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
C0 (MAIN) END_COLLECTION Logical
05 0D (GLOBAL) USAGE_PAGE 0x000D Digitizer Device Page
09 22 (LOCAL) USAGE 0x000D0022 Finger (Logical Collection)
A1 02 (MAIN) COLLECTION 0x02 Logical (Usage=0x000D0022: Page=Digitizer Device Page, Usage=Finger, Type=Logical Collection)
09 42 (LOCAL) USAGE 0x000D0042 Tip Switch (Momentary Control)
25 01 (GLOBAL) LOGICAL_MAXIMUM 0x01 (1)
75 01 (GLOBAL) REPORT_SIZE 0x01 (1) Number of bits per field
81 02 (MAIN) INPUT 0x00000002 (1 field x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 32 (LOCAL) USAGE 0x000D0032 In Range (Momentary Control)
81 02 (MAIN) INPUT 0x00000002 (1 field x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 47 (LOCAL) USAGE 0x000D0047 Confidence (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 1 bit) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
95 05 (GLOBAL) REPORT_COUNT 0x05 (5) Number of fields
81 03 (MAIN) INPUT 0x00000003 (5 fields x 1 bit) 1=Constant 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
75 08 (GLOBAL) REPORT_SIZE 0x08 (8) Number of bits per field
95 01 (GLOBAL) REPORT_COUNT 0x01 (1) Number of fields
09 51 (LOCAL) USAGE 0x000D0051 Contact Identifier (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
05 01 (GLOBAL) USAGE_PAGE 0x0001 Generic Desktop Page
26 FF7F (GLOBAL) LOGICAL_MAXIMUM 0x7FFF (32767)
75 10 (GLOBAL) REPORT_SIZE 0x10 (16) Number of bits per field
09 30 (LOCAL) USAGE 0x00010030 X (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 16 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 31 (LOCAL) USAGE 0x00010031 Y (Dynamic Value)
81 02 (MAIN) INPUT 0x00000002 (1 field x 16 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
C0 (MAIN) END_COLLECTION Logical
05 0D (GLOBAL) USAGE_PAGE 0x000D Digitizer Device Page
09 54 (LOCAL) USAGE 0x000D0054 Contact Count (Dynamic Value)
75 08 (GLOBAL) REPORT_SIZE 0x08 (8) Number of bits per field
25 08 (GLOBAL) LOGICAL_MAXIMUM 0x08 (8)
81 02 (MAIN) INPUT 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
09 55 (LOCAL) USAGE 0x000D0055 Contact Count Maximum (Static Value)
B1 02 (MAIN) FEATURE 0x00000002 (1 field x 8 bits) 0=Data 1=Variable 0=Absolute 0=NoWrap 0=Linear 0=PrefState 0=NoNull 0=NonVolatile 0=Bitmap
C0 (MAIN) END_COLLECTION Application
*/
//--------------------------------------------------------------------------------
// Digitizer Device Page featureReport 54 (Device <-> Host)
//--------------------------------------------------------------------------------
typedef struct
{
uint8_t reportId; // Report ID = 0x54 (84) 'T'
// Collection: TouchScreen
uint8_t DIG_TouchScreenContactCountMaximum; // Usage 0x000D0055: Contact Count Maximum, Value = 0 to 8
} featureReport54_t;
//--------------------------------------------------------------------------------
// Digitizer Device Page inputReport 54 (Device --> Host)
//--------------------------------------------------------------------------------
typedef struct
{
uint8_t reportId; // Report ID = 0x54 (84) 'T'
// Collection: TouchScreen Finger
uint8_t DIG_TouchScreenFingerTipSwitch : 1; // Usage 0x000D0042: Tip Switch, Value = 0 to 1
uint8_t DIG_TouchScreenFingerInRange : 1; // Usage 0x000D0032: In Range, Value = 0 to 1
uint8_t DIG_TouchScreenFingerConfidence : 1; // Usage 0x000D0047: Confidence, Value = 0 to 1
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t DIG_TouchScreenFingerContactIdentifier; // Usage 0x000D0051: Contact Identifier, Value = 0 to 1
uint16_t GD_TouchScreenFingerX; // Usage 0x00010030: X, Value = 0 to 32767
uint16_t GD_TouchScreenFingerY; // Usage 0x00010031: Y, Value = 0 to 32767
uint8_t DIG_TouchScreenFingerTipSwitch_1 : 1; // Usage 0x000D0042: Tip Switch, Value = 0 to 1
uint8_t DIG_TouchScreenFingerInRange_1 : 1; // Usage 0x000D0032: In Range, Value = 0 to 1
uint8_t DIG_TouchScreenFingerConfidence_1 : 1; // Usage 0x000D0047: Confidence, Value = 0 to 1
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t : 1; // Pad
uint8_t DIG_TouchScreenFingerContactIdentifier_1; // Usage 0x000D0051: Contact Identifier, Value = 0 to 1
uint16_t GD_TouchScreenFingerX_1; // Usage 0x00010030: X, Value = 0 to 32767
uint16_t GD_TouchScreenFingerY_1; // Usage 0x00010031: Y, Value = 0 to 32767
// Collection: TouchScreen
uint8_t DIG_TouchScreenContactCount; // Usage 0x000D0054: Contact Count, Value = 0 to 8
} inputReport54_t;
Upvotes: 1
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