First upload. Untested software

2026-04-08 17:02:29 +02:00
commit 9b83763318
11 changed files with 698 additions and 0 deletions
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+/* Baremetal Risc-V USB <=> Amiga Joystick/Mouse HID converter. 
+ * March 2026 - Anders Holck
+ * This software has no license. If you choose to use, please include my name :)
+*/
+
+#ifndef USB_DESCRIPTORS_H
+#define USB_DESCRIPTORS_H
+
+#include <stdint.h>
+
+// USB Standard Request Codes
+#define USB_REQ_GET_STATUS        0x00
+#define USB_REQ_CLEAR_FEATURE     0x01
+#define USB_REQ_SET_FEATURE       0x03
+#define USB_REQ_SET_ADDRESS       0x05
+#define USB_REQ_GET_DESCRIPTOR    0x06
+#define USB_REQ_SET_DESCRIPTOR    0x07
+#define USB_REQ_GET_CONFIGURATION 0x08
+#define USB_REQ_SET_CONFIGURATION 0x09
+
+// Descriptor Types
+#define USB_DESC_DEVICE           0x01
+#define USB_DESC_CONFIGURATION    0x02
+#define USB_DESC_STRING           0x03
+#define USB_DESC_INTERFACE        0x04
+#define USB_DESC_ENDPOINT         0x05
+#define USB_DESC_HID              0x21
+#define USB_DESC_REPORT           0x22
+
+// Device Descriptor
+const uint8_t device_desc[] = {
+    18,                 // bLength
+    USB_DESC_DEVICE,    // bDescriptorType
+    0x00, 0x02,         // bcdUSB (2.0)
+    0x00,               // bDeviceClass
+    0x00,               // bDeviceSubClass
+    0x00,               // bDeviceProtocol
+    64,                 // bMaxPacketSize0
+    0x6B, 0x1D,         // idVendor (0x1D6B - Linux Foundation)
+    0x04, 0x01,         // idProduct (0x0104)
+    0x00, 0x01,         // bcdDevice
+    1,                  // iManufacturer
+    2,                  // iProduct
+    3,                  // iSerialNumber
+    1                   // bNumConfigurations
+};
+
+// HID Report Descriptor (Combined Gamepad and Mouse)
+const uint8_t hid_report_desc[] = {
+    0x05, 0x01,        // Usage Page (Generic Desktop)
+    0x09, 0x04,        // Usage (Joystick)
+    0xA1, 0x01,        // Collection (Application)
+    
+    // Joystick 1 & 2 Buttons (10 buttons total)
+    0x05, 0x09,        //   Usage Page (Button)
+    0x19, 0x01,        //   Usage Minimum (Button 1)
+    0x29, 0x0A,        //   Usage Maximum (Button 10)
+    0x15, 0x00,        //   Logical Minimum (0)
+    0x25, 0x01,        //   Logical Maximum (1)
+    0x75, 0x01,        //   Report Size (1)
+    0x95, 0x0A,        //   Report Count (10)
+    0x81, 0x02,        //   Input (Data, Var, Abs)
+    
+    // Padding for buttons (6 bits)
+    0x75, 0x01,        //   Report Size (1)
+    0x95, 0x06,        //   Report Count (6)
+    0x81, 0x03,        //   Input (Cnst, Var, Abs)
+
+    // Mouse X/Y (Relative)
+    0x05, 0x01,        //   Usage Page (Generic Desktop)
+    0x09, 0x01,        //   Usage (Pointer)
+    0xA1, 0x00,        //   Collection (Physical)
+    0x09, 0x30,        //     Usage (X)
+    0x09, 0x31,        //     Usage (Y)
+    0x15, 0x81,        //     Logical Minimum (-127)
+    0x25, 0x7F,        //     Logical Maximum (127)
+    0x75, 0x08,        //     Report Size (8)
+    0x95, 0x02,        //     Report Count (2)
+    0x81, 0x06,        //     Input (Data, Var, Rel)
+    0xC0,              //   End Collection
+
+    0xC0               // End Collection
+};
+
+// Configuration Descriptor
+const uint8_t config_desc[] = {
+    9,                  // bLength
+    USB_DESC_CONFIGURATION,
+    34, 0,              // wTotalLength (9+9+9+7)
+    1,                  // bNumInterfaces
+    1,                  // bConfigurationValue
+    0,                  // iConfiguration
+    0x80,               // bmAttributes (Bus Powered)
+    250,                // bMaxPower (500mA)
+
+    // Interface Descriptor
+    9,                  // bLength
+    USB_DESC_INTERFACE,
+    0,                  // bInterfaceNumber
+    0,                  // bAlternateSetting
+    1,                  // bNumEndpoints
+    0x03,               // bInterfaceClass (HID)
+    0x00,               // bInterfaceSubClass
+    0x00,               // bInterfaceProtocol
+    0,                  // iInterface
+
+    // HID Descriptor
+    9,                  // bLength
+    USB_DESC_HID,
+    0x11, 0x01,         // bcdHID (1.11)
+    0x00,               // bCountryCode
+    1,                  // bNumDescriptors
+    USB_DESC_REPORT,    // bDescriptorType
+    sizeof(hid_report_desc), 0, // wItemLength
+
+    // Endpoint Descriptor (IN 1)
+    7,                  // bLength
+    USB_DESC_ENDPOINT,
+    0x81,               // bEndpointAddress (IN 1)
+    0x03,               // bmAttributes (Interrupt)
+    8, 0,               // wMaxPacketSize (8 bytes)
+    10                  // bInterval (10ms)
+};
+
+#endif /* USB_DESCRIPTORS_H */