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I am trying to send HID reports with different report ids - my report id is the first byte in the buffer. On my device the report always comes through as report id 0x00. I am not getting this issue on linux.
int res;
uint8_t buffer[65] = {0};
buffer[0] = REPORT_ID_CUSTOM; // Report ID (must be 1st byte)
buffer[1] = CMD_ADD; // Command
buffer[2] = data.modifier; // First data byte
memcpy(&buffer[3], data.keycode, 6); // Remaining 6 data bytes
res = hid_write(handle, buffer, sizeof(buffer));```
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Replies: 2 comments 1 reply
You may want to post more info about your device's HID report descriptors, hidapi version used, etc.
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1 reply
Yes ofcourse:
HID api version v0.15.0
My descriptor using usbview is as follows:
[Port4] : USB Composite Device
Is Port User Connectable: yes
Is Port Debug Capable: no
Companion Port Number: 0
Companion Hub Symbolic Link Name:
Protocols Supported:
USB 1.1: yes
USB 2.0: yes
USB 3.0: no
Device Power State: PowerDeviceD0
---===>Device Information<===---
English product name: "Macropad"
ConnectionStatus:
Current Config Value: 0x01 -> Device Bus Speed: Full (is not SuperSpeed or higher capable)
Device Address: 0x08
Open Pipes: 3
===>Device Descriptor<===
bLength: 0x12
bDescriptorType: 0x01
bcdUSB: 0x0200
bDeviceClass: 0x00 -> This is an Interface Class Defined Device
bDeviceSubClass: 0x00
bDeviceProtocol: 0x00
bMaxPacketSize0: 0x40 = (64) Bytes
idVendor: 0xCAFE = Vendor ID not listed with USB.org
idProduct: 0x400C
bcdDevice: 0x0100
iManufacturer: 0x01
English (United States) "MicRaj"
iProduct: 0x02
English (United States) "Macropad"
iSerialNumber: 0x03
English (United States) "503359276ACE359F"
bNumConfigurations: 0x01
---===>Open Pipes<===---
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x81 -> Direction: IN - EndpointID: 1
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x05
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x02 -> Direction: OUT - EndpointID: 2
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x0A
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x82 -> Direction: IN - EndpointID: 2
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x0A
---===>Full Configuration Descriptor<===---
===>Configuration Descriptor<===
bLength: 0x09
bDescriptorType: 0x02
wTotalLength: 0x0042 -> Validated
bNumInterfaces: 0x02
bConfigurationValue: 0x01
iConfiguration: 0x00
bmAttributes: 0xA0 -> Bus Powered
-> Remote Wakeup
MaxPower: 0x32 = 100 mA
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x01
bInterfaceClass: 0x03 -> HID Interface Class
bInterfaceSubClass: 0x01
bInterfaceProtocol: 0x01
iInterface: 0x00
===>HID Descriptor<===
bLength: 0x09
bDescriptorType: 0x21
bcdHID: 0x0111
bCountryCode: 0x00
bNumDescriptors: 0x01
bDescriptorType: 0x22 (Report Descriptor)
wDescriptorLength: 0x0043
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x81 -> Direction: IN - EndpointID: 1
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x05
===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x01
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0x03 -> HID Interface Class
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
iInterface: 0x00
===>HID Descriptor<===
bLength: 0x09
bDescriptorType: 0x21
bcdHID: 0x0111
bCountryCode: 0x00
bNumDescriptors: 0x01
bDescriptorType: 0x22 (Report Descriptor)
wDescriptorLength: 0x0024
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x02 -> Direction: OUT - EndpointID: 2
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x0A
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x82 -> Direction: IN - EndpointID: 2
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x0A
I have tried different buffersizes eg uint8_t buffer[64] = {0}; , uint8_t buffer[63] = {0}; but all of them seem to have a prepended 0x00 report id
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Please take a look at this thread and see if it helps you.
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