126 lines
4.3 KiB
C
126 lines
4.3 KiB
C
/* Baremetal Risc-V USB <=> Amiga Joystick/Mouse HID converter.
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* March 2026 - Anders Holck
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* This software has no license. If you choose to use, please include my name :)
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*/
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#ifndef USB_DESCRIPTORS_H
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#define USB_DESCRIPTORS_H
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#include <stdint.h>
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// USB Standard Request Codes
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#define USB_REQ_GET_STATUS 0x00
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#define USB_REQ_CLEAR_FEATURE 0x01
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#define USB_REQ_SET_FEATURE 0x03
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#define USB_REQ_SET_ADDRESS 0x05
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#define USB_REQ_GET_DESCRIPTOR 0x06
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#define USB_REQ_SET_DESCRIPTOR 0x07
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#define USB_REQ_GET_CONFIGURATION 0x08
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#define USB_REQ_SET_CONFIGURATION 0x09
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// Descriptor Types
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#define USB_DESC_DEVICE 0x01
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#define USB_DESC_CONFIGURATION 0x02
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#define USB_DESC_STRING 0x03
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#define USB_DESC_INTERFACE 0x04
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#define USB_DESC_ENDPOINT 0x05
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#define USB_DESC_HID 0x21
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#define USB_DESC_REPORT 0x22
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// Device Descriptor
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const uint8_t device_desc[] = {
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18, // bLength
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USB_DESC_DEVICE, // bDescriptorType
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0x00, 0x02, // bcdUSB (2.0)
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0x00, // bDeviceClass
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0x00, // bDeviceSubClass
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0x00, // bDeviceProtocol
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64, // bMaxPacketSize0
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0x6B, 0x1D, // idVendor (0x1D6B - Linux Foundation)
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0x04, 0x01, // idProduct (0x0104)
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0x00, 0x01, // bcdDevice
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1, // iManufacturer
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2, // iProduct
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3, // iSerialNumber
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1 // bNumConfigurations
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};
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// HID Report Descriptor (Combined Gamepad and Mouse)
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const uint8_t hid_report_desc[] = {
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0x05, 0x01, // Usage Page (Generic Desktop)
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0x09, 0x04, // Usage (Joystick)
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0xA1, 0x01, // Collection (Application)
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// Joystick 1 & 2 Buttons (10 buttons total)
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0x05, 0x09, // Usage Page (Button)
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0x19, 0x01, // Usage Minimum (Button 1)
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0x29, 0x0A, // Usage Maximum (Button 10)
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0x15, 0x00, // Logical Minimum (0)
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0x25, 0x01, // Logical Maximum (1)
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0x75, 0x01, // Report Size (1)
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0x95, 0x0A, // Report Count (10)
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0x81, 0x02, // Input (Data, Var, Abs)
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// Padding for buttons (6 bits)
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0x75, 0x01, // Report Size (1)
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0x95, 0x06, // Report Count (6)
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0x81, 0x03, // Input (Cnst, Var, Abs)
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// Mouse X/Y (Relative)
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0x05, 0x01, // Usage Page (Generic Desktop)
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0x09, 0x01, // Usage (Pointer)
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0xA1, 0x00, // Collection (Physical)
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0x09, 0x30, // Usage (X)
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0x09, 0x31, // Usage (Y)
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0x15, 0x81, // Logical Minimum (-127)
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0x25, 0x7F, // Logical Maximum (127)
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0x75, 0x08, // Report Size (8)
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0x95, 0x02, // Report Count (2)
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0x81, 0x06, // Input (Data, Var, Rel)
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0xC0, // End Collection
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0xC0 // End Collection
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};
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// Configuration Descriptor
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const uint8_t config_desc[] = {
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9, // bLength
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USB_DESC_CONFIGURATION,
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34, 0, // wTotalLength (9+9+9+7)
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1, // bNumInterfaces
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1, // bConfigurationValue
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0, // iConfiguration
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0x80, // bmAttributes (Bus Powered)
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250, // bMaxPower (500mA)
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// Interface Descriptor
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9, // bLength
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USB_DESC_INTERFACE,
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0, // bInterfaceNumber
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0, // bAlternateSetting
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1, // bNumEndpoints
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0x03, // bInterfaceClass (HID)
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0x00, // bInterfaceSubClass
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0x00, // bInterfaceProtocol
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0, // iInterface
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// HID Descriptor
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9, // bLength
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USB_DESC_HID,
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0x11, 0x01, // bcdHID (1.11)
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0x00, // bCountryCode
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1, // bNumDescriptors
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USB_DESC_REPORT, // bDescriptorType
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sizeof(hid_report_desc), 0, // wItemLength
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// Endpoint Descriptor (IN 1)
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7, // bLength
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USB_DESC_ENDPOINT,
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0x81, // bEndpointAddress (IN 1)
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0x03, // bmAttributes (Interrupt)
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8, 0, // wMaxPacketSize (8 bytes)
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10 // bInterval (10ms)
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};
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#endif /* USB_DESCRIPTORS_H */
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