I did some more research on the issue and found out that Linux's X.org server (which is used to map kernel level keycodes into actual ASCII for screen display) might not be interpreting the microcontrollers keycodes correctly. How can i get the microcontroller to send keyboard events that Linux will interpret correctly and display them on screen? Any help or example that would point me in the right way to achieve compatibility with Linux is appreciated 
. I tested it on two Linux distros (Arch and Ubuntu) but no luck. The following code is the usb descriptor i found on the link, maybe it's missing something?Code: Select all
const unsigned int USB_VENDOR_ID = 0x4406;
const unsigned int USB_PRODUCT_ID = 0x0007;
const char USB_SELF_POWER = 0x80; // Self powered 0xC0, 0x80 bus powered
const char USB_MAX_POWER = 50; // Bus power required in units of 2 mA
const char HID_INPUT_REPORT_BYTES = 64;
const char HID_OUTPUT_REPORT_BYTES = 64;
const char USB_TRANSFER_TYPE = 0x03; //0x03 Interrupt
const char EP_IN_INTERVAL = 1;
const char EP_OUT_INTERVAL = 1;
const char USB_INTERRUPT = 1;
const char USB_HID_EP = 1;
const char USB_HID_RPT_SIZE = 63;
/* Device Descriptor */
const struct {
char bLength; // bLength - Descriptor size in bytes (12h)
char bDescriptorType; // bDescriptorType - The constant DEVICE (01h)
unsigned int bcdUSB; // bcdUSB - USB specification release number (BCD)
char bDeviceClass; // bDeviceClass - Class Code
char bDeviceSubClass; // bDeviceSubClass - Subclass code
char bDeviceProtocol; // bDeviceProtocol - Protocol code
char bMaxPacketSize0; // bMaxPacketSize0 - Maximum packet size for endpoint 0
unsigned int idVendor; // idVendor - Vendor ID
unsigned int idProduct; // idProduct - Product ID
unsigned int bcdDevice; // bcdDevice - Device release number (BCD)
char iManufacturer; // iManufacturer - Index of string descriptor for the manufacturer
char iProduct; // iProduct - Index of string descriptor for the product.
char iSerialNumber; // iSerialNumber - Index of string descriptor for the serial number.
char bNumConfigurations; // bNumConfigurations - Number of possible configurations
} device_dsc = {
0x12, // bLength
0x01, // bDescriptorType
0x0200, // bcdUSB
0x00, // bDeviceClass
0x00, // bDeviceSubClass
0x00, // bDeviceProtocol
8, // bMaxPacketSize0
USB_VENDOR_ID, // idVendor
USB_PRODUCT_ID, // idProduct
0x0001, // bcdDevice
0x01, // iManufacturer
0x02, // iProduct
0x00, // iSerialNumber
0x01 // bNumConfigurations
};
/* Configuration 1 Descriptor */
const char configDescriptor1[]= {
// Configuration Descriptor
0x09, // bLength - Descriptor size in bytes
0x02, // bDescriptorType - The constant CONFIGURATION (02h)
0x29,0x00, // wTotalLength - The number of bytes in the configuration descriptor and all of its subordinate descriptors
1, // bNumInterfaces - Number of interfaces in the configuration
1, // bConfigurationValue - Identifier for Set Configuration and Get Configuration requests
0, // iConfiguration - Index of string descriptor for the configuration
USB_SELF_POWER, // bmAttributes - Self/bus power and remote wakeup settings
USB_MAX_POWER, // bMaxPower - Bus power required in units of 2 mA
// Interface Descriptor
0x09, // bLength - Descriptor size in bytes (09h)
0x04, // bDescriptorType - The constant Interface (04h)
0, // bInterfaceNumber - Number identifying this interface
0, // bAlternateSetting - A number that identifies a descriptor with alternate settings for this bInterfaceNumber.
2, // bNumEndpoint - Number of endpoints supported not counting endpoint zero
0x03, // bInterfaceClass - Class code
0, // bInterfaceSubclass - Subclass code
0, // bInterfaceProtocol - Protocol code
0, // iInterface - Interface string index
// HID Class-Specific Descriptor
0x09, // bLength - Descriptor size in bytes.
0x21, // bDescriptorType - This descriptor's type: 21h to indicate the HID class.
0x11,0x01, // bcdHID - HID specification release number (BCD).
0x00, // bCountryCode - Numeric expression identifying the country for localized hardware (BCD) or 00h.
1, // bNumDescriptors - Number of subordinate report and physical descriptors.
0x22, // bDescriptorType - The type of a class-specific descriptor that follows
USB_HID_RPT_SIZE,0x00, // wDescriptorLength - Total length of the descriptor identified above.
// Endpoint Descriptor
0x07, // bLength - Descriptor size in bytes (07h)
0x05, // bDescriptorType - The constant Endpoint (05h)
USB_HID_EP | 0x80, // bEndpointAddress - Endpoint number and direction
USB_TRANSFER_TYPE, // bmAttributes - Transfer type and supplementary information
0x40,0x00, // wMaxPacketSize - Maximum packet size supported
EP_IN_INTERVAL, // bInterval - Service interval or NAK rate
// Endpoint Descriptor
0x07, // bLength - Descriptor size in bytes (07h)
0x05, // bDescriptorType - The constant Endpoint (05h)
USB_HID_EP, // bEndpointAddress - Endpoint number and direction
USB_TRANSFER_TYPE, // bmAttributes - Transfer type and supplementary information
0x40,0x00, // wMaxPacketSize - Maximum packet size supported
EP_OUT_INTERVAL // bInterval - Service interval or NAK rate
};
const struct {
char report[];
}hid_rpt_desc =
{
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x06, // USAGE (Keyboard)
0xa1, 0x01, // COLLECTION (Application)
0x05, 0x07, // USAGE_PAGE (Keyboard)
0x19, 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)
0x29, 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x08, // REPORT_COUNT (8)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x08, // REPORT_SIZE (8)
0x81, 0x03, // INPUT (Cnst,Var,Abs)
0x95, 0x05, // REPORT_COUNT (5)
0x75, 0x01, // REPORT_SIZE (1)
0x05, 0x08, // USAGE_PAGE (LEDs)
0x19, 0x01, // USAGE_MINIMUM (Num Lock)
0x29, 0x05, // USAGE_MAXIMUM (Kana)
0x91, 0x02, // OUTPUT (Data,Var,Abs)
0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x03, // REPORT_SIZE (3)
0x91, 0x03, // OUTPUT (Cnst,Var,Abs)
0x95, 0x06, // REPORT_COUNT (6)
0x75, 0x08, // REPORT_SIZE (8)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x65, // LOGICAL_MAXIMUM (101)
0x05, 0x07, // USAGE_PAGE (Keyboard)
0x19, 0x00, // USAGE_MINIMUM (Reserved (no event indicated))
0x29, 0x65, // USAGE_MAXIMUM (Keyboard Application)
0x81, 0x00, // INPUT (Data,Ary,Abs)
0xc0 // End Collection
};
//Language code string descriptor
const struct {
char bLength;
char bDscType;
unsigned int string[1];
} strd1 = {
4,
0x03,
{0x0409}
};
//Manufacturer string descriptor
const struct{
char bLength;
char bDscType;
unsigned int string[10];
}strd2={
22, //sizeof this descriptor string
0x03,
{'T','U',' ','G','a','b','r','o','v','o'}
};
//Product string descriptor
const struct{
char bLength;
char bDscType;
unsigned int string[15];
}strd3={
32, //sizeof this descriptor string
0x03,
{'U','S','B',' ','M','a','n','i','p','u','l','a','t','o','r'}
};
//Array of configuration descriptors
const char* USB_config_dsc_ptr[1];
//Array of string descriptors
const char* USB_string_dsc_ptr[3];
void USB_Init_Desc(){
USB_config_dsc_ptr[0] = &configDescriptor1;
USB_string_dsc_ptr[0] = (const char*)&strd1;
USB_string_dsc_ptr[1] = (const char*)&strd2;
USB_string_dsc_ptr[2] = (const char*)&strd3;
}
Forward Edit #1
